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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
1
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
General Description
Features
Functional Diagram
The HMC660LC4B is a SiGe monolithic, fully-
differential, track-and-hold that provides unprecedented
bandwidth and performance to wideband sampled
signal systems. The novel design and low aperture jitter
enable 9 to 10-bit signal capture from 20 MHz to 4.5
GHz while sampling to 3 GS/s. The narrow sampling
aperture allows signal acquisition at frequencies well
beyond the input bandwidth. The output can be held for
5 ns, enabling lower-speed ADCs to sub sample a high
frequency wideband input signal.
4.5 GHz Input bandwidth (1 Vpp Full Scale)
3 GS/s Maximum Sampling Rate
61 dB SFDR (4 GHz / 0.5 Vpp Input, CLK = 1 GS/s)
55 dB SFDR (4 GHz / 1 Vpp Input, CLK = 1 GS/s)
Ultra-clean Output Waveforms, Minimal Glitching
>60 dB Hold Mode Feedthrough Rejection
1.05 mV RMS Hold Mode Output Noise
Single / Dual Rank Evaluation Boards Available
RoHS Compliant 4x4 mm SMT Package
Typical Applications
The HMC660LC4B is ideal for:
• RF ATE Applications
• Digital Sampling Oscilloscopes
• RF Demodulation Systems
• Digital Receiver Systems
• High Speed Peak Detectors
• Software Dened Radio
• Radar, ECM & ELINT Systems
• High Speed DAC De-Glitching
Electrical Specications TA = +25C, See Test Conditions on following page herein.
Parameter Conditions Test Level Min. Typ. Max. Units
Analog Inputs (INP, INN)
Differential Full Scale Range 1Vpp
AC Coupling Low Frequency Corner 16 MHz
Input Resistance Each lead to ground 50
Return Loss 0 to 5 GHz 12 dB
DC Clock Inputs (CLKDCP, CLKDCN)
Common Mode Voltage 22.5 3 V
Differential Clock High Voltage (Track Mode) 20 40 2000 mV
Differential Clock Low Voltage (T/H Mode) -20 -40 -2000 mV
Differential Input Current 10 µA
Common Mode Input Current CLKDCP, CLKDCN @ 2.5V 6µA
AC Clock Inputs (CLKP, CLKN)
Amplitude (Sinusoidal Input) Per input terminal -10 010 dBm
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
2
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Electrical Specications, (continued)
Parameter Conditions Test Level Min. Typ. Max. Units
Clock Slew Rate Recommended for best linearity 4 V/ns
Input Impedance 50
Return Loss 0 - 3 GHz 16 dB
Input Resistance 50
Analog Outputs (OUTP, OUTN)
Differential Full Scale Range 1Vpp
Common Mode Output Voltage 4.0 V
Output Impedance 50
Return Loss 0 - 4 GHz 15 dB
Track Mode Dynamics
Gain 0dB
Track Mode Bandwidth @ 1 Vpp Input 3.95 GHz
Lower Frequency Corner 16 MHz
Single Tone SFDR @ 500 MHz 1 Vpp Input 54.8 dB
Single Tone SFDR @ 1000 MHz 1 Vpp Input 54.7 dB
Single Tone SFDR @ 2000 MHz 1 Vpp Input 52.6 dB
Single Tone SFDR @ 3000 MHz 1 Vpp Input 50.4 dB
Single Tone SFDR @ 4000 MHz 1 Vpp Input 49 dB
Two Tone SFDR @ 500 MHz 0.5 Vpp Input 57.4 dB
Two Tone SFDR @ 995/1005 MHz 0.5 Vpp Input per Tone 56.4 dB
Two Tone SFDR @ 1995/2005 MHz 0.5 Vpp Input per Tone 54.5 dB
Two Tone SFDR @ 2995/3005 MHz 0.5 Vpp Input per Tone 52.5 dB
Two Tone SFDR @ 3995/4005 MHz 0.5 Vpp Input per Tone 50.2 dB
Noise Spectral Density @ 1 GHz 8.9 nV/√Hz
Integrated Noise [2] 0.95 mV RMS
Hold Mode Dynamics
Sampling Bandwidth @ -3 dB Gain, 1 Vpp Input Level 4.5 GHz
Differential Droop Rate 0.5 %/ns
Feedthrough Rejection 0 - 4000 MHz ≥ 60 dB
Integrated Noise [2] 500 MHz Clock Frequency 1.04 mV RMS
Maximum Hold Time 5 ns
Single Tone THD/SFDR 995 MHz [1] -54 / 54 dB
Single Tone THD/SFDR 1995 MHz [1] -58 / 58 dB
Single Tone THD/SFDR 2995 MHz [1] -59 / 61 dB
Single Tone THD/SFDR 3995 MHz [1] -54 / 54 dB
Track-to-Hold Switching
Aperture Delay -6 ps
Aperture Jitter [1] 84 fs
Settling Time to 1 mV Simulated Value 206 ps
Differential Pedestal 500 MHz Clock Frequency,
0 dBm Clock Power -0.3 %
Clock Frequency 100 3000 MHz
Clock Buffer Pipeline Delay 38 ps
[1] 1 Vpp Input Level, 1 GS/s Clock, Clock Power = 6 dBm / input terminal.
[2] Noise bandwidth limited by output amplier bandwidth of ~7 GHz.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
3
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Parameter Conditions Test Level Min. Typ. Max. Units
Hold-to-Track Switching
Acquisition Time to 1 mV Simulated Value 205 ps
Power Supply Requirements
VccSH Voltage 4.75 55.25 V
VccSH Current 61 mA
Vcc1 Voltage 4.75 55.25 V
Vcc1 Current 50 mA
Vcc2 Voltage 5.7 66.3 V
Vcc2 Current 84 mA
VccCLK Voltage 4.75 55.25 V
VccCLK Current 20 mA
Power Dissipation 1.16 W
Electrical Specications, (continued)
Test Levels
1. 100% production tested at TA = +25C
2. Guaranteed by design/characterization testing
3. Sample Tested
4. Typical value only
Time Domain Output Waveform
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0 2 1034 1036 1038 10310 103
Track Mode
T/H Mode
DIFFERENTIAL OUTPUT VOLTAGE (V)
TIME (ps)
Clock Frequency = 500 MHz
Input Frequency = 3.125 GHz
Sampling Transfer Function
-8
-7
-6
-5
-4
-3
-2
-1
0
100 1000 10000
Sampling Transfer Function
Ideal 4.5 GHz Lowpass
MAGNITUDE (dB)
FREQUENCY (MHz)
Dual Rank Second Order SFDR vs. Clock
Slew Rate @ 4 GHz Input Frequency [1]
40
45
50
55
60
0 2 4 6 8 10 12 14 16 18 20
SFDR (dB)
CLOCK SLEW RATE (V/ns)
[1] Data is derived from linearity measurements at clock frequencies from 0.5 to 3.0 GHz.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
4
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Hold-Mode SFDR vs. Frequency
& Input Power [2]
Hold-Mode THD vs. Frequency
& Input Power [2]
Hold-Mode THD vs. Frequency
& Input Power [1]
Hold-Mode SFDR vs. Frequency
& Input Power [1]
-85
-75
-65
-55
-45
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
THD (dB)
FREQUENCY (MHz)
-85
-75
-65
-55
-45
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
THD (dB)
FREQUENCY (MHz)
45
55
65
75
85
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
45
55
65
75
85
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
[1] Square Wave Clock: 0.5 GS/s @ 6.3 V/ns Slew Rate
[2] Clock Power = +6 dBm, Clock Rate 1 GS/s
[3] Clock Power = 0 dBm, Clock Rate 2 GS/s
-75
-65
-55
-45
-35
2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
THD (dB)
FREQUENCY (MHz)
45
55
65
75
85
2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
Hold-Mode SFDR vs. Frequency
& Input Power [3]
Hold-Mode THD vs. Frequency
& Input Power [3]
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
5
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Hold-Mode SFDR vs. Frequency & Clock
Power @ Full Scale (1Vpp) [1]
Hold-Mode SFDR vs. Clock Power &
Clock Frequency @ Full Scale (1Vpp) [1]
Hold-Mode SFDR vs. Clock Power &
Clock Frequency @ Full Scale (1Vpp) [2]
Hold-Mode SFDR vs. Frequency & Clock
Power @ Full Scale (1Vpp) [2]
Hold-Mode SFDR vs. Clock Power &
Clock Frequency @ Full Scale (1Vpp) [3]
Hold-Mode SFDR vs. Frequency & Clock
Power @ Full Scale (1Vpp) [3]
35
45
55
65
75
1000 2000 3000 4000
0 dBm
+6 dBm
+10 dBm
SFDR (dB)
FREQUENCY (MHz)
Clock Power 2nd Order
3rd Order
30
40
50
60
70
80
50
60
70
80
90
100
110
0246810
2
nd
Order SFDR (dB)
3rd Order SFDR (dB)
Clock Power (dBm)
4 GHz
3 GHz
2 GHz
1 GHz
4 GHz
1 GHz
3 GHz
30
40
50
60
70
50
60
70
80
90
100
0246810
2
nd
Order SFDR (dB)
3rd Order SFDR (dB)
Clock Power (dBm)
4 GHz
3 GHz
2 GHz
4 GHz
3 GHz
2 GHz
40
50
60
70
80
2000 3000 4000
0 dBm
+6 dBm
+10 dBm
SFDR (dB)
FREQUENCY (MHz)
Clock Power
3rd Order
2nd Order
45
55
65
75
85
1000 2000 3000 4000
0 dBm
+6 dBm
+10 dBm
SFDR (dB)
FREQUENCY (MHz)
Clock Power
3rd Order
2nd Order
30
40
50
60
70
80
50
60
70
80
90
100
0246810
2
nd
Order SFDR (dB)
3rd Order SFDR (dB)
Clock Power (dBm)
4 GHz
3 GHz
2 GHz
1 GHz
4 GHz
1 GHz
[1] Clock Rate 0.5 GS/s
[2] Clock Rate 1 GS/s
[3] Clock Rate 2 GS/s
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
6
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Dual Rank Hold-Mode SFDR vs.
Frequency & Input Power [2]
Dual Rank Hold-Mode THD vs. Frequency
& Input Power [2]
Dual Rank Hold-Mode THD vs. Frequency
& Input Power [1]
Dual Rank Hold-Mode SFDR vs.
Frequency & Input Power [1]
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
THD (dB)
FREQUENCY (MHz)
40
45
50
55
60
65
70
75
80
85
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
THD (dB)
FREQUENCY (MHz)
40
45
50
55
60
65
70
75
80
85
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
Dual Rank Hold-Mode SFDR vs.
Frequency & Input Power [3]
Dual Rank Hold-Mode THD vs. Frequency
& Input Power [3]
-75
-65
-55
-45
-35
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
THD (dB)
FREQUENCY (MHz)
35
40
45
50
55
60
65
70
75
80
1000 2000 3000 4000
Full Scale (1 Vpp)
Half Full Scale (0.5 Vpp)
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
[1] Square Wave Clock: 0.5 GS/s @ 6.3 V/ns Slew Rate
[2] Clock Power = +6 dBm, Clock Rate 1 GS/s
[3] Clock Power = 0 dBm, Clock Rate 2 GS/s
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
7
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Track-Mode Two-Tone SFDR vs.
Frequency [2]
Track-Mode Single-Tone SFDR vs.
Frequency [1]
45
55
65
75
85
0 1000 2000 3000 4000
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
45
55
65
75
85
0 1000 2000 3000 4000
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
Dual Rank Track-Mode Two-Tone
SFDR vs. Frequency [2]
Dual Rank Track-Mode Single-Tone
SFDR vs. Frequency [1]
40
45
50
55
60
65
70
75
80
85
1000 2000 3000 4000
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
40
45
50
55
60
65
70
75
80
85
1000 2000 3000 4000
SFDR (dB)
FREQUENCY (MHz)
3rd Order
2nd Order
[1] Input Voltage = 1 Vpp
[2] 10 MHz Tone Separation, 0.5 Vpp per Tone
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
8
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Aperture Delay: The delay of the exact sample time relative to the time that the hold command is applied to the
device. It is the difference between the delay of the clock switching transition to the hold node and the input signal
group delay to the hold node. If the input signal group delay to the hold node exceeds the clock delay this quantity
can be negative.
Aperture Jitter: The standard deviation of the sample instant in time.
Acquisition Time: The interval between the internal hold-to-track transition and the time at which the hold-node
signal is tracking the input signal within a specied accuracy. It does not include the pipeline delay of the clock buffer.
Differential Pedestal: An error term in the sample value caused by charge redistribution in the T/H switch during
the sampling transition. In general, the pedestal can consist of three components: a xed offset, a component that is
linearly related to input signal amplitude, and a component that is nonlinearly related to input signal amplitude. The
majority of the pedestal is usually linear. A small nonlinear component can cause sampling nonlinearity.
Differential Droop Rate: The slow drift in the differential output voltage of a held sample while the T/H is in hold-
mode. It is typically caused by current leakage on the hold capacitors and corresponds to a decay in the held voltage
with increasing time. The majority of the voltage droop over a given time is usually linearly related to the held sample
voltage and is expressed as a percentage of initial amplitude per unit time. Since it is mostly linear, the droop causes
little nonlinearity.
Feedthrough Rejection: A measure of the off-state (hold-mode) isolation of the T/H’s internal switch. It is dened
as the ratio of the amplitude of the output signal (for a sinusoidal input) feeding through during the hold mode to
the amplitude of the output signal during track mode. Normalization by the track-mode signal gives the true switch
isolation without the effects of the output amplier bandwidth limiting.
Full Scale Range: The voltage range between the minimum and maximum signal levels that can be handled by the
T/H while still meeting the specications.
Gain Flatness: The deviation in gain over a specied input band relative to a specied mid-frequency gain.
Sampling Bandwidth: The -3 dB bandwidth of the sampled signal levels represented by the held sample amplitudes.
It includes both the bandwidth of the transfer function from the signal input to the hold-node and any band-limiting
effects associated with the nite time duration of the sampling aperture.
Settling Time: The interval between the internal track-hold transition and the time at which the held output signal is
settled to within a specied accuracy. It does not include the pipeline delay of the clock buffer.
Spurious Free Dynamic Range (SFDR): The ratio (usually expressed in dB) between the sinusoidal output signal
amplitude and the amplitude of the largest non-linearity product falling within one Nyquist bandwidth. It may be
specied for both full scale input and some fraction(s) of full scale input. A SFDR based only on 2nd order nonlinear
products is referred to as the 2nd order SFDR (SFDR2). A SFDR based only on 3rd order products is referred to as the
3rd order SFDR (SFDR3).
Total Harmonic Distortion (THD): The ratio of the total power in the non-linearity-generated harmonics and harmonic
aliases (measured in one Nyquist band) to the output signal power.
Denition of Specications
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
9
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
ESD: On-chip ESD protection networks are incorporated on the terminals, but the RF/microwave compatible interfaces
provide minimal protection and ESD precautions should be used.
Power Supply Sequencing: The recommended power supply startup sequence is Vcc2, Vcc1, VccSH, VccCLK,
(CLKDCP, CLKDCN) if biased from independent supplies. Vcc1, VccSH, VccCLK can be connected to one +5V supply
if desired.
Input Signal Drive: For best results, the inputs should be driven differentially. The input circuit has an on-chip
resistive bias-T for separating the DC and RF components of the input. The low frequency corner of the RF path is
approximately 16 MHz (Coupling=10 pF, Rdc=1.28 K ohm). The input can be driven single-ended but the linearity of
the device will be degraded somewhat.
Clock Input: The clock inputs should be driven differentially if possible. The device is in track-mode when (CLKP –
CLKN) is high and it is in hold-mode when (CLKP-CLKN) is low.
The T/H-mode 2nd order linearity of the device varies somewhat with clock slew rate as shown in the performance
data plots. Because of the slew rate dependence, the 2nd order linearity will vary somewhat with clock power for
sinusoidal signals. For optimal linearity, a clock zero-crossing slew rate of roughly 4 V/ns (per clock input) or more is
recommended. For sinusoidal clock inputs, this corresponds to a sinusoidal clock power per differential half-circuit
input of -3.5 dBm at 3 GHz, 0 dBm at 2 GHz, and 6 dBm at 1 GHz.
At clock frequencies lower than 1 GHz, a square wave clock will provide the best 2nd order linearity performance.
The clock input circuit has an on-chip resistive bias-T for separating the DC and RF components of the input. The low
frequency corner of the RF path is approximately 9 MHz (Coupling=10 pF, Rdc = 1.7 K ohm with clock DC shorted).
Outputs: The outputs should be sensed differentially for the cleanest output waveforms. The output impedance is
50 resistive returned to the Vcc2 supply. If the load is also 50 returned to the Vcc2 supply, then the Vcc2 supply
should be 5V. If the output is capacitively coupled to 50 then the Vcc2 supply should be 6V. The bandwidth of the
output amplier (beyond the hold-node) is approximately 7 GHz. This produces approximately a 1 dB roll-off at the 3
dB bandwidth of the hold node (4.5 GHz) resulting in an overall track-mode 3 dB bandwidth of approximately 3.9 GHz.
Hence, the output amplitude of the sampled waveform may be somewhat larger than the track mode response at high
input frequencies due to the effect of the output amplier bandwidth.
The output amplier noise contribution to the total output noise is substantial. If desired, a signicant reduction in
output noise can be achieved by ltering the output to a lower bandwidth than the output amplier bandwidth of 7
GHz. This is particularly effective if operating at lower clock rates. For example, the output noise can be reduced by
approximately 4 dB if the output bandwidth is reduced by a factor of four from 7 GHz down to 1.75 GHz.
The output will have very sharp transitions at the clock edges due to the broad output amplier bandwidth. The
user should be aware that any signicant length of cable between the chip output and the load will cause frequency
response roll-off and dispersion that can produce low amplitude tails with relatively long time-constants in the settling
of the output waveform into the load. This effect is most noticeable when operating in a lab setting with output cables
of a few feet length, even with high quality cable. Output cables between the T/H and the load should be of very high
quality and 2 ft or less in length.
Reections between the load and the device will also degrade the hold mode response. The output cable length can
be adjusted to minimize the reection perturbations to some extent. In general, the round trip transit time of the cable
should be an integer number of clock periods to obtain the minimal reection perturbation in the hold mode portion of
the waveform. The optimal performance is obtained when the T/H is within 50 ps or less of the load since this gives a
reection duration equal to the approximate settling time of the device.
Application Notes
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
10
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Linearity Measurement and Calculation
When characterizing the linearity of a T/H, the transfer function linearity of the held samples (referred to as T/H-mode
linearity) is usually the quantity of most interest to the user. These samples contain the signal information that is
ultimately digitized by the downstream A/D converter. Since the T/H-mode linearity is often different than the track-
mode linearity, this presents a unique measurement issue in that the linearity of only the hold-portion of the analog
output waveform must be selectively measured.
This issue is aggravated for high speed T/Hs because there are few wide-band time domain instruments (oscilloscopes
or A/D converters) with sufficient linearity to characterize a high linearity T/H. Therefore a frequency domain instrument
(spectrum analyzer) and measurement technique are used which allow selective characterization of the hold-mode
portion of the waveform
A common approach to this requirement has been to cascade two T/Hs in a dual rank conguration such that the
second T/H (T/H 2) re-samples the output of the rst T/H (T/H 1). The two T/Hs are usually clocked 180 degrees out-
of-phase in master-slave operation to eliminate the track-mode portion of the output waveform from the rst T/H. This
arrangement produces an output waveform that consists of two time segments. The rst segment is the T/H 1 hold-
mode output as observed through the T/H 2 track-mode transfer function. The second time segment is the T/H 1 hold-
mode output re-sampled and held by the T/H 2 device. This measurement approach is not a perfect representation
of the linearity of a single T/H due to the impact of the second T/H on the overall linearity. However, it does eliminate
the track-mode portion of the T/H 1 output and permits a spectrum analyzer linearity measurement of the cascaded
devices. Since T/H 2 only has to sample the held waveform from T/H 1, the linearity impact of T/H 2 is primarily
associated with its DC linearity. An often used approximation is that the DC linearity of T/H 2 is much higher than the
slew-rate dependent, high frequency linearity of T/H 1 so that the total non-linearity of the cascade is dominated by
the high frequency linearity of T/H 1. In this case, the dual rank conguration has a net linearity that closely resembles
the linearity of a single T/H, particularly at high frequencies. However, this approximation is not always valid. If not, the
dual rank conguration fails to represent the linearity of a single T/H. The HMC660LC4B represents such a case; the
3rd order nonlinearity of this device varies relatively slowly with frequency and is high enough over the T/H bandwidth
that the DC linearity of the 2nd T/H signicantly impacts the overall dual rank conguration.
Another linearity measurement issue unique to the T/H device is the need for output frequency response correction.
In the case of a dual rank T/H, the output waveform resembles a square wave with duration equal to the clock period.
Mathematically, the output can be viewed as the convolution of an ideal delta-function sample train with a single
square pulse of duration equal to one clock period. This weights the output spectral content with a SIN(πf/fs )/(πf/fs)
(Sinc) function frequency response envelope which has nulls at harmonics of the clock frequency fs and substantial
response reduction beyond half the clock frequency. The spectral content of the held samples without the envelope
weighting is required for proper measurement of the sample’s linearity. Either the impact of the response envelope
must be corrected in the data or a measurement method must be used that heterodynes the relevant nonlinear
harmonic products to low frequencies to avoid signicant envelope response weighting. This latter method is referred
to as the beat-frequency technique.
The beat-frequency technique is commonly used for high-speed T/H linearity measurements, although the
measurement does impose restrictions on the specic input signal and clock frequencies that can be used. For
example, with a clock frequency of 512.5 MHz, a single tone input at 995 MHz beats with the 2nd harmonic of the
sampling frequency (through the sampling process) to produce a 1st order beat product at 30 MHz. Likewise, the 2nd
and 3rd harmonics of the input signal (generated via distortion in the T/H) beat with the 4th and 6th harmonics of the
sampling frequency respectively to produce 2nd and 3rd order beat products at 60 MHz and 90 MHz. In this manner,
the T/H nonlinearity in the vicinity of 1 GHz can be measured even though the 995 MHz fundamental and the 1.99
GHz and 2.985 GHz nonlinear harmonics are well beyond the 206 MHz bandwidth of the Sinc response envelope.
The possible input frequency choices are overly limited when the low frequency beat-product technique is used at high
clock rates. A related high frequency beat-product measurement utilizing correction for the Sinc envelope weighting
must be employed to measure linearity over a wide range of input frequencies. Hittite uses both low frequency and
high frequency beat product methods to measure linearity for a wide range of clock and signal frequencies. Our high
frequency beat-product measurement avoids excessive envelope correction error by maintaining all beat products
within the 4 dB bandwidth of the Sinc function, where the envelope response is well behaved and easily modeled.
Hittite has also developed a method for accurately measuring the held-sample linearity of a single T/H using a beat-
frequency technique that avoids errors due to nonlinear products associated with the track-mode portion of the
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
11
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Typical Operating Circuit
Notes:
1. For track mode operation, CLKDCP and CLKDCN must be driven as shown above.
VCM = 2.5V, VDIFF = 40mV typical.
2. For track-and-hold mode operation, pin 11 and 12 may be left oating, or VDIFF can be set to zero.
3. All differential inputs are terminated on-chip with 50 ohms to ground.
Linearity Measurement and Calculation (Continued)
waveform. This single T/H linearity measurement method provides accurate results for clock frequencies up to about
2 GHz. This method is used to characterize and specify the linearity of a single T/H in the data sheet, in addition to
the usual dual rank conguration linearity measurements. Detailed information on the measurement technique and
theory can be found in the Application Note T/H Linearity Measurement Issues and Methods available at www.hittite.
com.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
12
HMC660LC4B
v04.0514
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3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Absolute Maximum Ratings
Outline Drawing
VccSH 5.5 Vdc
Vcc1 5.5 Vdc
Vcc2 6.5 Vdc
CLKP, CLKN Input Power +10 d Bm
Input Signal Amplitude +10 d Bm
Junction Temperature 125 °C
Continuous Pdiss (T= 85 °C) 1.22 W
Thermal Resistance
(junction to package bottom) 32.8 °C/W
Storage Temperature -65 to +150 °C
Operating Temperature -40 to +85 °C
NOTES:
1. PACKAGE BODY MATERIAL: ALUMINA
2. LEAD AND GROUND PADDLE PLATING: 30-80 MICROINCHES GOLD OVER
50 MICROINCHES MINIMUM NICKEL.
3. DIMENSIONS ARE IN INCHES [MILLIMETERS].
4. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm DATUM -C-
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Package Information
Part Number Package Body Material Lead Finish MSL Rating Package Marking [2]
HMC660LC4B Alumina, White Gold over Nickel MSL3 [1] H660
XXXX
[1] Max peak reow temperature of 260 °C
[2] 4-Digit lot number XXXX
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
13
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Pin Number Function Description Interface Schematic
1, 13, 19,
23, 24 N/C Not connected.
2, 5, 14,
17, 20, 22 GND These pins must be connected to
a high quality RF/DC ground.
3INP
Positive T/H RF input (input bias -T). Has on-chip DC
50 termination, nominal max single-ended input level
= ±0.25V (-2 dBm) for specied performance. Input AC
coupling time constant ~ 10 ns, +10 dBm max.
4INN
Negative T/H RF input (input bias -T). Has on-chip DC
50 termination, nominal max single-ended input level
= ±0.25V (-2 dBm) for specied performance. Input AC
coupling time constant ~ 10 ns, +10 dBm max.
6VccSH
T/H core supply. Requires nominal current of 61.5 mA
at 5V. A 10 nF X7R dielectric chip capacitor close to the
device is recommended.
7N/C This pin must be left oating.
8VccCLK Clock buffer power. Requires 19.8 mA
nominal current at 5V.
9, 10 CLKN, CLKP
Negative CLK RF input, Positive CLK RF input (CLK input
bias -T). Has on-chip 50 termination, +10 dBm max. AC
coupling time constant ~17 ns.
11, 12 CLKDCP, CLKDCN
Positive CLKDC input and Negative CLKDC input (CLK
input bias-T). A 10 n F X7R dielectric chip capacitor or
equivalent should be used here. Internal bias -T isolation
resistor = 1k. May be oated for T/H operation. If biased
use common mode voltage of 2.5 V. Apply differential
voltage of (CLKDCP – CLKDCN ) > 20 mV to force device
in steady state track mode (in the absence of a clock). A
40 mV differential voltage can be continuously applied that
allows the device to be biased in track mode whenever the
clock is turned off.
Pin Descriptions
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
14
HMC660LC4B
v04.0514
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3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Pin Descriptions (Continued)
Pin Number Function Description Interface Schematic
15, 16 OUTP, OUTN
Positive T/H RF output, Negative T/H RF output. 50 
output impedance, nominal DC output voltage = 3.9V.
Can be returned to Vcc2 through 50 ohms or AC coupled.
Device can be damaged if the output is shorted to ground.
18 Vcc2
Output buffer 2 output driver power. The supply should
be 5V if the output is DC coupled to the Vcc2 supply. The
supply should be 6V if the output is AC coupled; Vcc2
current is 84 mA nominal. A 10 nF X 7R dielectric chip
capacitor connected close to the device is recommended
21 Vcc1
5V power for output buffers 1 and 2. Requires a nominal
current of 49.8 mA at 5V. A 10 nF X7R dielectric chip
capacitor connected close to the device is recommended.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
15
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Single Evaluation PCB
The circuit board used in the nal application
should use RF circuit design techniques. Signal
lines should have 50 ohm impedance while the
package ground leads and exposed paddle should
be connected directly to the ground plane similar to
that shown. A sufficient number of via holes should
be used to connect the top and bottom ground
planes in order to provide good RF grounding to
10 GHz. The evaluation circuit board shown is
available from Hittite upon request.
List of Materials for Evaluation PCB 113055 [1]
Item Description
J1 - J6 Johnson SMA Connector
J7 9 pin DC Connector
C1, C2, C5 - C10 10K pF Chip Capacitor, 0402 Pkg.
C3, C4 1 uF & 82 pF, 16 kHz to 40 GHz Chip
Capacitor, 0502 Pkg.
C15 - C22 4.7 uF, Case A, Tantulum Capacitor
U1 HMC660LC4B Track-and-Hold Amplier
PCB [2] 113057 Single Eval Board
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
16
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Application Circuit for Single Evaluation PCB
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
17
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Characterization Set-up for Single Evaluation PCB
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
18
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Item Description
J1 - J8 Johnson SMA Connector
J9 10 Pin DC Connector
C10, C11, C14, C15,
C18 - C25 10K pF Chip Capacitor, 0402 Pkg.
C12, C13 Cap, Chip, 0302 Pkg.
12k pF and 82 pF 130 kHz to 100 GHz
C16, C17 1 uF & 82 pF, 16 KHz to 40 GHz Chip
Capacitor, 0502 Pkg.
C28 - C35 4.7 uF, Case A, Tantulum Capacitor, Note
Polarity
U1, U2 HMC660LC4B Track-and-Hold Amplier
PCB [2] 114350 Eval Board
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350
Dual Rank Evaluation PCB
List of Materials for Evaluation PCB 114352 [1]
The circuit board used in the nal application
should use RF circuit design techniques. Signal
lines should have 50 ohm impedance while the
package ground leads and exposed paddle should
be connected directly to the ground plane similar to
that shown. A sufficient number of via holes should
be used to connect the top and bottom ground
planes in order to provide good RF grounding to
10 GHz. The evaluation circuit board shown is
available from Hittite upon request.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
19
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Application Circuit for Dual Rank Evaluation PCB
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
20
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Characterization Set-up for Dual Rank Evaluation PCB
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
21
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Product Application Circuits
Direct Conversion Receiver Track-and-Hold Amplier Application
Generic Software Radio Track-and-Hold Amplier Application
ASIC/DSPT/H
O U T+
OUT-
CLKDC+
CLKDC-
IN+
IN-
CLK- CLK+
50 50
5050
HIGH
SPEED
ADC
Tx
Channel
ASIC/DSP
IF
IF
LO
3 GHz
18 GHz
T/H
O U T+
OUT-
CLKDC+
CLKDC-
IN+
IN-
CLK- CLK+
50 50
5050
ADC
HMC398QS16G
VCO w/ Divide-by-8
• 14 - 15 GHz
• +6 dBm Output Power
• Low Phase Noise
-75 dBc/Hz @ 10 kHz
HMC660LC4B
Track-and-Hold Amplier
• 0.02 - 4.5 GHz
• -66/67 dB Single Tone THD/SFDR
• 3.0 GS/s Max. Clock Rate
• 0.95 mV RMS Output Noise
• >60 dB Hold Mode
Feedthrough Rejection
HMC547LP3
Hi-Isolation SPDT
• DC - 20 GHz
• +18 dB Insertion Loss
• 47 dB Isolation
• 23 dBm Input P1dB
• Fast Switching
HMC523LC4
I/Q Mixer / IRM
• 15 - 23.6 GHz RF/LO
• 25 dB Image Rejection
• -8 dB Conversion Gain
• +25 dBm Input IP3
• DC - 3.5 GHz IF
HMC660LC4B
Track-and-Hold Amplier
• 0.02 - 4.5 GHz
• -66/67 dB Single Tone THD/SFDR
• 3.0 GS/s Max. Clock Rate
• 0.95 mV RMS Output Noise
• >60 dB Hold Mode
Feedthrough Rejection
HMC311LP3
HBT Gain Block
• 14.5 dB Gain
• 4.5 dB Noise Figure
• +15 dBm P1dB
HMC460
LNA, DC - 20 GHz
• 2.5 dB Noise Figure
• 14 dB Gain
• +16 dBm P1dB
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
DATA CONVERTERS - SMT
22
HMC660LC4B
v04.0514
0.02 - 4.5 GHz WIDEBAND
3 GS/s TRACK-AND-HOLD AMPLIFIER
DISCONTINUED PRODUCT
Not Recommended for New Designs
Notes: