THIS PAGE INTENTIONALLY LEFT BLANK
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
The HMC875LC3C is a SiGe monolithic, ultra fast
comparator that features reduced swing CML output
drivers and clock inputs. The comparator supports
20 Gbps operation while providing 120 ps clock to
data output delay and 60 ps minimum pulse width with
0.2 ps rms random jitter (RJ). 25 Gbps operation can
be achieved with reduced output voltage swing. Over-
drive and slew rate dispersion are typically 10 ps,
making the device ideal for a wide range of applicati-
ons from ATE to broadband communications. The
reduced swing CML output stage is designed to directly
drive 400 mV into 50 ohms terminated to GND. The
HMC875LC3C features high-speed latches with pro-
grammable hysteresis, and is congured to operate as
a clocked comparator.
General Description
Features
Functional Diagram
Propagation Delay Clock to Output: 120 ps
Overdrive & Slew Rate Dispersion: 10 ps
Minimum Pulse Width: 60 ps
Resistor Programmable Hysteresis
Differential Clock Control
Input Bandwidth: 10 GHz
Power Dissipation: 130 mW
RSPECL and RSECL Versions Available
16 Lead 3x3 mm SMT Package: 9 mm2
Typical Applications
The HMC875LC3C is ideal for:
• ATE Applications
• High Speed Instrumentation
• Digital Receiver Systems
• Pulse Spectroscopy
• High Speed Trigger Circuits
• Clock & Data Restoration
Electrical Specications
TA = +25 ºC, Vcci= +3.3 V, Vcco = 0 V, CLK / CLK = 1.6 V to 2.4 V, Vee = -3 V, VTERM = 0 V
Parameter Conditions Min. Typ. Max Units
Input Voltage Range Maximum DC Input Current = 20 mA -2 2 V
Input Differential Voltage -1.75 1.75 V
Input Offset Voltage ±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
Hysteresis Rhys = ∞ ±1 mV
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Clock Characteristics
Parameter Conditions Min. Typ. Max Units
Clock Input Impedance Each Pin 50 Ω
Clock to Data Output Delay, tpd 120 ps
Clock Input Range 1.6 2.0 2.4 V
Clock Max Frequency, fmax 25 GHz
DC Output Characteristics, Vcco = 0 V with 50 Ω to VTERM = 0 V
Parameter Conditions Min. Typ. Max Units
Output Voltage High Level, Voh -10 0mV
Output Voltage Low Level, Vol -420 -330 mV
Output Voltage Differential Swing 330 420 mV
AC Performance
Parameter Conditions Min. Typ. Max Units
VOD Dispersion 50mV < VOD < 1 V 10 ps
Tpd vs. Common Mode Dispersion,
-1.75 V <Vcm <1.75 V VOD = 50 mV 3 ps
Equivalent Input Bandwidth [1] 8.3 9.6 11. 2 GHz
Deterministic Jitter (pp) Deterministic Jitter at 10 Gbps
with ±100 mV Overdrive < 3 ps
Random Jitter (rms) Random Jitter at 10 Gbps
with ±100 mV Overdrive 0.2 ps rms
Minimum Pulse Width 60 ps
Q / Q Rise Time From 20% to 80% 28 ps
Q / Q Fall Time From 20% to 80% 22 ps
Power Supply Requirements
Parameter Conditions Min. Typ. Max Units
Input Supply Current, Icci 12 mA
Output Supply Current, Icco 9mA
Vee Current, lee 29 mA
Power Dissipation, Pd 130 mW
PSRR, Vcci 35 dB
PSRR, Vee 35 dB
Note 1: 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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Dispersion vs. Overdrive Voltage
Propagation Delay vs. Input Common
Mode Voltage[1]
Output Voltage vs. Temperature
Delay vs. Temperature
Voltage Swing vs. Temperature
Power Dissipation vs. Temperature
[1] Vcci = +3.3 V, Vcco = 0 V, Vee = -3 V, VTERM = 0 V
-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)
-0.6
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
-50 -35 -20 -5 10 25 40 55 70 85 100
VOH
VOL
VOLTAGE (V)
TEMPERATURE (C)
10
15
20
25
30
35
40
-50 -35 -20 -5 10 25 40 55 70 85 100
tr
tf
DELAY (ps)
TEMPERATURE (C)
-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 (ps)
COMMON MODE VOLTAGE (mV)
0.4
0.41
0.42
0.43
0.44
0.45
-50 -35 -20 -5 10 25 40 55 70 85 100
VOLTAGE (V)
TEMPERATURE (C)
100
120
140
160
180
200
-50 -35 -20 -5 10 25 40 55 70 85 100
POWER (mW)
TEMPERATURE (C)
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Eye Diagram
TJ(1E-12): 6.71 ps DJ-): 3.08 ps RJ(rms): 265 fs
RJ(-): 310 fs DDJ(p-p): 3.24 ps DCD: ------
PJ(rms) 0.0 s ISI J(p-p) 3.24 ps
Bit Rate 5.00000 Gb/s
Pat Length 127 Bits
Div. Ratio 1:8
0
1
2
3
4
5
100 1000
HYSTERESIS (mV)
RESISTANCE (Ohm)
0
2
4
6
8
10
1 10 100
HYSTERESIS (mV)
FREQUENCY (MHz)
5
10
15
20
25
30
35
40
-50 -35 -20 -5 10 25 40 55 70 85 100
I_Vcco
I_Vee
I_Vcci
CURRENT (mA)
TEMPERATURE (C)
Currents vs. Temperature
Comparator Hysteresis vs. Rhys Control
Resistor
Comparator Hysteresis vs. Clock
Frequency (Rhys = ∞)
Absolute Maximum Ratings
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
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 Differential (Vcci - Vcco) -0.5 V to +3.5 V
Input Voltage -2 V to +2 V
Differential Input Voltage -2 V to +2 V
Input Voltage, Clock -0.5 V to Vcci +0.5 V
Applied Voltage (HYS) Vee to GND
Maximum Input Current ±20 mA
Output Current 20 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
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Timing Diagram
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Outline Drawing
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 MUST BE SOLDERED TO PCB RF GROUND.
7. PADDLE MUST NOT BE DC GND. THERMAL DISSIPATION PATH ONLY.
Package Information
Part Number Package Body Material Lead Finish MSL Rating Package Marking [2]
HMC875LC3C Alumina, White Gold over Nickel MSL3 [1] H875
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Pin Descriptions
Pin Number Function Description Interface Schematic
1VTP Termination resistor return pin for INP Input.
2INP Non-Inverting analog input
3INN Inverting analog input
4VTN Termination resistor return pin for INN input
5, 16 Vcci Positive supply voltage input stage.
6CLK Clock input pin, inverting side.
7CLK Clock input pin, non-inverting side.
8CLKRTN Clock RTN pin, connect to GND.
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, after a positive transition
on CLK and negative transition on CLK.
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, after a positive transition
on CLK and negative transition on CLK.
14 HYS
Hysteresis Control pin. This pin should be left disconnected
to minimize hysteresis. Connect to Vee with a resistor to
add the desired amount of hysteresis.
13 Vee Negative power supply, -3V.
15 RTN Return for ESD protection, connect to GND.
Package Base Do not DC GND. Thermal dissipation path only.
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
The circuit board used in the application should
use RF circuit design techniques. Signal lines
should have 50 Ohm impedance while the package
ground leads should be connected directly to the
ground plane similar to that shown. The exposed
paddle should not be electronically connected to
DC GND, thermal dissipation path only. 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 25 GHz. The evaluation
circuit board shown is available from Hittite upon
request.
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 HMC875LC3C 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]
Application Circuit
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Application Circuits: CLK, CLK Interfacing
Figure A1: Resistor Network
Figure A2: Bias Tee
