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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
COMPARATORS - SMT
1
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
The HMC674LC3C is a SiGe monolithic,
ultra fast comparator. The comparator supports
10 Gbps operation while providing 85 ps
propagation delay and 60 ps minimum pulse width
with 0.2 ps rms random jitter (RJ). Overdrive and slew rate
dispersion are typically 10 ps, making the device ideal
for a wide range of applications from ATE to broadband
communications. The output stages are designed to
directly drive 400 mV into 50 ohms terminated to Vtt =
(Vcco - 2.0 V). The HMC674LP3E features high speed
latch and programmable hysteresis and may be
congured to operate in either latch mode, or as a
tracking comparator.
General Description
Features
Functional Diagram
Equivalent Input Bandwidth: 10 GHz
Propagation Delay: 85 ps
Overdrive & Slew Rate Dispersion: 10 ps
Minimum Pulse Width: 60 ps
Resistor Programmable Hysteresis
Differential Latch Control
Power Dissipation: 140 mW
RSCML Version Available
16 Lead 3x3 mm SMT Package: 9 mm2
Typical Applications
The HMC674LC3C is ideal for:
• ATE Applications
• High Speed Instrumentation
• Digital Receiver Systems
• Pulse Spectroscopy
• High Speed Trigger Circuits
• Clock & Data Restoration
Parameter Conditions Min. Typ. Max Units
Input Voltage Range -2 +2 V
Input Differential Voltage -1.75 1.75 V
Input Offset Voltage (VOS)±5 mV
Input Offset Voltage, Temperature Coefficient 15 µV / °C
Input Bias Current 15 uA
Input Bias Current Temperature Coefficient 50 nA / °C
Input Offset Current 4µA
Input Impedance 50 Ω
Common Mode Input Impedance 350 KΩ
Differential Input Impedance 15 KΩ
Active Gain 48 dB
Common Mode Rejection Ratio 80 dB
Hysteresis Rhys = ∞ ±1 mV
Electrical Specications TA = +25°C, Vcci= +3.3 V, Vcco = +2.0 V, Vee = -3 V, Vtt = 0 V
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
COMPARATORS - SMT
2
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
Parameter Conditions Min. Typ. Max Units
Latch Enable Input Impedance Each Pin 8KΩ
Latch Enable to Output Delay, tPLOL, tPLOH VOD = 200 mV 85 ps
Latch Enable Minimum Pulse Width, tPL VOD = 200 mV 20 ps
Latch Enable Input Range VOD = 200 mV 1.6 2.4 V
Latch Setup Time, tSVOD = 200 mV 45 ps
Latch Hold Time, tH-42 ps
DC Output Characteristics, Vcco = +2.0 V, Vtt = 0 V
Parameter Conditions Min. Typ. Max Units
Output Voltage High Level, Voh 1.03 1.09 1.14 V
Output Voltage Low Level, Vol 0.65 0.71 0.81 V
Output Voltage Differential Swing 440 760 980 mVpp
AC Performance
Parameter Conditions Min. Typ. Max Units
Propagation Delay - tPD, tPDL, tPDH VOD = 500 mV 80 85 110 ps
Propagation Delay, Temperature Coefficient 0.45 ps / °C
Propagation Delay Skew
(Rising to Falling Transition) VOD - 500 mV 10 ps
VOD[1] Dispersion 50 mV <VOD <1V 10 ps
tPD vs. Common Mode Dispersion,
-1.75 V <Vcm <1.75 V VOD = 500 mV 8 ps
Noise (RTI) 5.9 nV/√(Hz) RTI
Equivalent Input Bandwidth [2] 8.6 9.3 12 GHz
Deterministic Jitter (pp) Deterministic Jitter at 10 Gbps
with ±100 mV Overdrive 2ps
Random Jitter (rms) Random Jitter at 10 Gbps
with ±100 mV Overdrive 0.2 ps rms
Input Signal Minimum Pulse Width VCM = 0; ±100 mV Overdrive 60 ps
Q / QB Rise Time From 20% to 80% 24 ps
Q / QB Fall Time From 20% to 80% 15 ps
Latch Enable Characteristics
[1] VOD is the input overdrive voltage, for example, (VINP - VINN - VOS) where VOS = input offset voltage.
[2] Equivalent Input Bandwidth is calculated with the following formula: Bweq=0.22/√ (TRCOMP2-TRIN2) where TRIN is the 20%/80% transition
time of a quasi-Gaussian signal applied to the comparator input, and TRCOMP is the effective transition time digitized by the comparator.
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
COMPARATORS - SMT
3
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
Dispersion vs. Overdrive Voltage Propagation Delay vs. Common Mode
Output Voltage vs. Temperature
Comparator Hysteresis
vs. Rhys Control Resistor
-1
1
3
5
7
9
11
0 10 20 30 40 50 60 70 80 90 100
Rising Edge
Falling Edge
DISPERSION (ps)
OVERDRIVE VOLTAGE (mV)
-5
-2.5
0
2.5
5
7.5
10
12.5
15
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
Rising Edge
Falling Edge
tPD
COMMON MODE VOLTAGE (mV)
1.8
2
2.2
2.4
2.6
2.8
-45 -32 -19 -6 7 20 33 46 59 72 85
VOH
VOL
VOLTAGE (Volts)
TEMPERATURE (C)
0
5
10
15
100 1000 10000
HYSTERESIS (mV)
RESISTANCE (Ohm)
Power Supply Requirements
Parameter Conditions Min. Typ. Max Units
Vcci 3.135 3.3 3.465 V
Vcco 1.0 2.0 2.5 V
Vee -3.15 -3.0 -2.85 V
Input Supply Current, Icci 9mA
Output Supply Current, Icco 45 mA
Vee Current, lee 19 mA
Power Dissipation, Pd 140 mW
PSRR, Vcci 38 dB
PSRR, Vee 38 dB
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
COMPARATORS - SMT
4
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
Timing Diagram
Timing Descriptions
Symbol Timing Description
tPDH Input to output high delay Propagation delay measured from the time the input signal crosses the reference
(± the input offset voltage) to the 50% point of an output low-to-high transition.
tPDL Input to output low delay Propagation delay measured from the time the input signal crosses the reference
(± the input offset voltage) to the 50% point of an output high-to-low transition.
tPLOH Latch enable to output high delay Propagation delay measured from the 50% point of the latch enable signal high-to-low
transition to the 50% point of an output low-to-high transition.
tPLOL Latch enable to output low delay Propagation delay measured from the 50% point of the latch enable signal high-to-low
transition to the 50% point of an output high-to-low transition.
tHMinimum hold time Minimum time after the positive transition of the latch enable signal that the input signal
must remain unchanged to be acquired and held at the outputs.
tPL Minimum latch enable pulse width Minimum time that the latch enable signal must be low to acquire an input signal
change.
tSMinimum setup time Minimum time before the positive transition of the latch enable signal that an input
signal change must be present to be acquired and held at the outputs.
tROutput rise time Amount of time required to transition from a low to a high output as measured at the
20% and 80% points.
tFOutput fall time Amount of time required to transition from a high to a low output as measured at the
20% and 80% points.
VOD Voltage overdrive Difference between the input voltages VINP and VINN-
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
COMPARATORS - SMT
5
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
The HMC674LC3C is a Latched Comparator with 10 GHz equivalent input bandwidth. The device is comprised of three
blocks: 1) An input amplier, 2) A latch, and 3) An Output Buffer. The latching circuit is level sensitive, and consists of a
single high-speed latch. The HMC674LC3C comparator supports 10 Gb/s operation. The minimum input data latching
pulse width is 60 ps.
The HMC674LC3C operates in either Track (Transparent) Mode, where the output follows the logical value of the input,
or the Latch (Hold) Mode, where the output value is held to the logical value of the comparison result of the input just prior
to (LE - LE_bar) going HI. Track Mode operation is selected by either 1) (LE - LE_bar) LO, or 2) LE and LE_bar inputs
oating. Latch Mode is selected by (LE - LE_bar) HI. The input impedance of the LE and LE_bar inputs is 8 k ohms, but
these inputs can be terminated with 50 ohm external resistors if desired.
When DC coupled, the clock inputs operate at an input common mode voltage of 2 V. In this case, any termination
resistors would ideally be returned to 2 V. If the clock is AC coupled to the device, the input termination resistors can be
returned to ground.
Operational Description
As long as the input signal is not near the -2 V extreme, either Vcc or Vee can be powered on rst. However, if the input
voltage is more negative than -1.8 V, we recommend the following power-up sequence.
1) Vee
2) Vcci and Vcco (if Vcco = Vcci)
3) Vcco (if different than ground).
Power down would be the reverse of this sequence.
It is also recommended that the device be powered before applying the input signal and also that the input signal be
removed prior to power down. This is most important if any of the inputs are more negative than -1.8 V.
Power Sequencing
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
COMPARATORS - SMT
6
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
Absolute Maximum Ratings
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Input Supply Voltage (Vcci to GND) -0.5 V to +4 V
Output Supply Voltage (Vcco to GND) -0.5 V to +4 V
Positive Supply Voltage Differential
(Vcci - Vcco) -0.5 V to +3.3 V
Input Voltage -2 V to +2 V
Differential Input Voltage -2 V to +2 V
Input Voltage, Latch Enable -0.5 V to Vcci +0.5 V
Applied Voltage (HYS) Vee to GND
Maximum Input Current ±20 mA
Output Current 40 mA
Junction Temperature 125°C
Continuous Pdiss (T = 85°C)
(Derate 20.4 mW/°C above 85°C) 0.816 W
Thermal Resistance (Rth) (Junction to Lead) 49°C/W
Storage Temperature -65°C to +150°C
Operating Temperature -40°C to +85°C
ESD Sensitivity (HBM) Class 1A
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 0.05 mm DATUM -C-
6. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.
7. PADDLE MUST BE SOLDERED TO Vee.
Package Information
Part Number Package Body Material Lead Finish MSL Rating Package Marking [2]
HMC674LC3C Alumina, White Gold over Nickel MSL3 [1] H674
XXXX
[1] Max peak reow 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
COMPARATORS - SMT
7
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
Pin Number Function Description Interface Schematic
1VTP Termination resistor return pin for Vp Input.
2INP Non-Inverting analog input
3INN Inverting analog input
4VTN Termination resistor return pin for Vn input
5, 16 Vcci Positive supply voltage input stage.
6LE Latch enable bar input pin, inverting side.
Refer to the Operational Description for more details.
7LE Latch enable input pin, non-inverting side.
Refer to the Operational Description for more details.
8N/C Pin is not connected inside the package.
Connect package pin to GND for improved noise.
9, 12 Vcco Positive supply voltage for the output stage.
10 Q
Inverting output. Q bar is at logic low if the analog voltage
at the non-inverting input, INP, is greater than the analog
voltage at the inverting input, INN, provided that the
comparator is in compare mode. Refer to the Operational
Description for more details.
11 Q
Non-inverting output. Q is at logic high if the analog voltage
at the non-inverting input, INP, is greater than the analog
voltage at the inverting input, INN, provided that the
comparator is in compare mode. Refer to the Operational
Description for more details..
14 HYS
Hysteresis Control pin. This pin should be left disconnected
for zero hysteresis. Connect to vee with a resistor to add
the desired amount of hysteresis. Refer to hysteresis graph
to determine the correct sizing of Rhys hysteresis control
resistor.
13 Vee Negative power supply, -3 V.
15 RTN Return for ESD protection.
Package Base Exposed paddle must be connected to Vee.
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
COMPARATORS - SMT
8
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
Evaluation PCB
Front Side
Back Side
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
COMPARATORS - SMT
9
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
The circuit board used in the application should
use RF circuit design techniques. Signal lines
should have 50 ohm impedance while the pack-
age ground leads 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.
Application Circuit
Item Description
J1 8 Pos. Vertical TIN
J2 - J7 2.92 mm 40 GHz Jack
J8 Terminal Strip, Single Row 3 Pin SMT
JP1, JP2 2 Pos. Vertical TIN
C1 - C3, C5, C6,
C8 - C10 100 pF Capacitor, 0402 Pkg.
C4, C7, C11 330 pF Capacitor, 0402 Pkg.
C11 - C13 4.7 uF Tantalum
TP1 - TP4 DC Pin, Swage Mount
U1 HMC674LC3C Comparator
PCB 125929 Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Rogers 4350 or Arlon 25FR
List of Materials for Evaluation PCB 125932 [1]
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
COMPARATORS - SMT
10
HMC674LC3C
v11.0714
10 GHz LATCHED COMPARATOR
Application Circuit: Output Interfacing
Output to Oscilloscope
