HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Typical Applications
The HMC875LC3C is ideal for:
Features
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 mm
2
COMPARATORS - SMT
• ATE Applications
• High Speed Instrumentation
• Digital Receiver Systems
• Pulse Spectroscopy
• High Speed Trigger Circuits
• Clock & Data Restoration
Functional Diagram
General Description
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 configured to operate as
a clocked comparator.
Electrical Specifications
Parameter
Input Voltage Range
Input Differential Voltage
Input Offset Voltage
T
A
= +25 ºC, Vcci= +3.3 V, Vcco = 0 V, CLK / CLK = 1.6 V to 2.4 V, Vee = -3 V, V
TERM
= 0 V
Conditions
Maximum DC Input Current = 20 mA
Min.
-2
-1.75
±5
15
15
50
4
50
350
15
Rhys = ∞
±1
Typ.
Max
2
1.75
Units
V
V
mV
µV / °C
uA
nA / °C
µA
Ω
KΩ
KΩ
mV
Input Offset Voltage, Temperature Coefficient
Input Bias Current
Input Bias Current Temperature Coefficient
Input Offset Current
Input Impedance
Common Mode Input Impedance
Differential Input Impedance
Hysteresis
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Clock Characteristics
Parameter
Clock Input Impedance
Clock to Data Output Delay, tpd
Clock Input Range
Clock Max Frequency, fmax
1.6
Conditions
Each Pin
Min.
Typ.
50
120
2.0
25
2.4
Max
Units
ps
V
GHz
DC Output Characteristics,
Vcco = 0 V with 50 Ω to
V
TERM
= 0 V
Parameter
Output Voltage High Level, Voh
Output Voltage Low Level, Vol
Output Voltage Differential Swing
Conditions
Min.
-10
-420
330
Typ.
Max
0
-330
420
Units
mV
mV
mV
AC Performance
Parameter
VOD Dispersion
Tpd vs. Common Mode Dispersion,
-1.75 V <Vcm <1.75 V
Equivalent Input Bandwidth
[1]
Deterministic Jitter (pp)
Random Jitter (rms)
Minimum Pulse Width
Q / Q Rise Time
Q / Q Fall Time
From 20% to 80%
From 20% to 80%
Deterministic Jitter at 10 Gbps
with ±100 mV Overdrive
Random Jitter at 10 Gbps
with ±100 mV Overdrive
Conditions
50mV < VOD < 1 V
VOD = 50 mV
8.3
Min.
Typ.
10
3
9.6
<3
0.2
60
28
22
11.2
Max
Units
ps
ps
GHz
ps
ps rms
ps
ps
ps
Power Supply Requirements
Parameter
Input Supply Current, Icci
Output Supply Current, Icco
Vee Current, lee
Power Dissipation, Pd
PSRR, Vcci
PSRR, Vee
Conditions
Min.
Typ.
12
9
29
130
35
35
Max
Units
mA
mA
mA
mW
dB
dB
Note 1: Equivalent Input Bandwidth is calculated with the following formula: Bweq=0.22/√ (TRCOMP
2
-TRIN
2
) 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
2
Ω
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Dispersion vs. Overdrive Voltage
11
Propagation Delay vs. Input Common
Mode Voltage
[1]
15
12.5
10
COMPARATORS - SMT
9
DISPERSION (ps)
7
5
3
1
-1
0
10
20
30
40
50
60
70
80
90
100
OVERDRIVE VOLTAGE (mV)
Rising Edge
Falling Edge
t
PD (ps)
7.5
5
2.5
0
-2.5
-5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
COMMON MODE VOLTAGE (mV)
Rising Edge
Falling Edge
Output Voltage vs. Temperature
0.1
0
-0.1
VOLTAGE (V)
Voltage Swing vs. Temperature
0.45
0.44
VOLTAGE (V)
-0.2
-0.3
-0.4
-0.5
-0.6
-50
0.43
0.42
0.41
-35
-20
-5
10
25
40
55
70
85
100
0.4
-50
-35
-20
-5
10
25
40
55
70
85
100
TEMPERATURE (C)
VOH
VOL
TEMPERATURE (C)
Delay vs. Temperature
40
35
Power Dissipation vs. Temperature
200
180
POWER (mW)
DELAY (ps)
30
25
20
15
10
-50
160
140
120
-35
-20
-5
10
25
40
55
70
85
100
100
-50
-35
-20
-5
10
25
40
55
70
85
100
TEMPERATURE (C)
tr
tf
TEMPERATURE (C)
[1] Vcci = +3.3 V, Vcco = 0 V, Vee = -3 V, V
TERM
= 0 V
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
HMC875LC3C
v06.0614
20 Gbps Clocked COMPARATOR
with RSCML OUTPUT STAGE
Comparator Hysteresis vs. Rhys Control
Resistor
5
4
HYSTERESIS (mV)
3
2
1
0
100
RESISTANCE (Ohm)
Currents vs. Temperature
40
35
CURRENT (mA)
30
25
20
15
10
1000
5
-50
-35
-20
-5
10
25
40
55
70
85
100
TEMPERATURE (C)
I_Vcco
I_Vee
I_Vcci
Comparator Hysteresis vs. Clock
Frequency (Rhys =
∞
)
10
8
HYSTERESIS (mV)
Eye Diagram
6
4
2
0
1
10
FREQUENCY (MHz)
100
TJ(1E-12): 6.71 ps
RJ(-):
310 fs
0.0 s
DJ-):
DDJ(p-p):
3.08 ps
3.24 ps
RJ(rms):
DCD:
ISI J(p-p)
265 fs
------
3.24 ps
Absolute Maximum Ratings
Input Supply Voltage (Vcci to GND)
Output Supply Voltage (Vcco to GND)
Positive Supply Differential (Vcci - Vcco)
Input Voltage
Differential Input Voltage
Input Voltage, Clock
Applied Voltage (HYS)
Maximum Input Current
Output Current
Junction Temperature
Continuous Pdiss (T = 85°C)
(Derate 20.4 mW/°C above 85°C)
Thermal Resistance (Rth) (Junction to Lead)
Storage Temperature
Operating Temperature
ESD Sensitivity (HBM)
-0.5 V to +4 V
-0.5 V to +4 V
-0.5 V to +3.5 V
-2 V to +2 V
-2 V to +2 V
-0.5 V to Vcci +0.5 V
Vee to GND
±20 mA
20 mA
125 °C
0.816 W
49 °C/W
-65 °C to +150 °C
-40 °C to +85 °C
Class 1A
PJ(rms)
Bit Rate
Pat Length
Div. Ratio
5.00000 Gb/s
127 Bits
1:8
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
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
Timing Diagram
COMPARATORS - SMT
5
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
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