HMC675LC3C
v10.0514
10 GHz LATCHED COMPARATOR
WITH RSCML OUTPUT STAGE
Typical Applications
The HMC675LC3C is ideal for:
Features
Equivalent Input Bandwidth: 10 GHz
Propagation Delay: 100 ps
Overdrive & Slew Rate Dispersion: 10 ps
Minimum Pulse Width: 60 ps
Resistor Programmable Hysteresis
Differential Latch Control
Power Dissipation: 100 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 HMC675LC3C is a SiGe monolithic, ultra fast
comparator that features reduced swing (RS) CML
output drivers and latch inputs. The comparator
supports 10 Gbps operation while providing 100 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 reduced swing CML output stage
is designed to directly drive 400 mV into 50 ohms
terminated to GND. The HMC675LC3C features high
speed latch and programmable hysteresis and may
be configured to operate in either latch mode, or as a
tracking comparator.
Electrical Specifications
Parameter
Input Voltage Range
Input Differential Voltage
Input Offset Voltage
T
A
= +25 ºC,
Vcci= +3.3 V, Vcco = 0 V, Vee = -3 V, V
TERM
= 0
Conditions
Min.
-2
-1.75
±5
15
15
50
4
50
350
15
43
80
Rhys = ∞
±1
Typ.
Max
2
1.75
Units
V
V
mV
µV / °C
uA
nA / °C
µA
Ω
KΩ
KΩ
dB
dB
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
Active Gain
Common Mode Rejection Ratio
Hysteresis
1
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery and to place orders: Hittite Microwave
other
For price, delivery, and to place orders: Analog Devices, Inc.,
Chelmsford, MA 01824
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or
Corporation, 2 Elizabeth Drive,
9106, Norwood, MA 02062-9106
One Technology Way, P.O. Box
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respective owners.
Application Support: Phone: 978-250-3343 or apps@hittite.com
HMC675LC3C
v10.0514
10 GHz LATCHED COMPARATOR
WITH RSCML OUTPUT STAGE
Latch Enable Characteristics
Parameter
Latch Enable Input Impedance
Latch Enable to Output Delay, t
PLOL
, t
PLOH
Latch Enable Minimum Pulse Width, t
PL
Latch Enable Input Range
Latch Setup Time, t
S
Latch Hold Time, t
H
Conditions
Each Pin
VOD = 200 mV
VOD = 200 mV
VOD = 200 mV
VOD = 200 mV
1.6
45
-42
Min.
Typ.
8
85
20
2.4
Max
Units
ps
ps
V
ps
ps
DC Output Characteristics,
with 50 Ω to GND
Parameter
Output Voltage High Level, Voh
Output Voltage Low Level, Vol
Output Voltage Differential Swing
Conditions
Min.
-10
-420
410
-400
400
Typ.
Max
0
-380
380
Units
mV
mV
mV
AC Performance
Parameter
Propagation Delay - t
PD
, t
PDL
, t
PDH
Propagation Delay, Temperature Coefficient
Propagation Delay Skew
(Rising to Falling Transition)
VOD Dispersion
T
PD
vs. Common Mode Dispersion,
-1.75V <Vcm <1.75V
Noise (RTI)
Equivalent Input Bandwidth
Deterministic Jitter (pp)
Random Jitter (rms)
Input Signal Minimum Pulse Width
Q / QB Rise Time
Q / QB Fall Time
From 20% to 80%
From 20% to 80%
[1]
Conditions
VOD = 500 mV
Min.
70
Typ.
100
0.45
Max
130
Units
ps
ps / °C
ps
ps
ps
nV/√(Hz) RTI
VOD - 500 mV
50mV < VOD < 1V
VOD = 500 mV
10
10
3
3.2
8.5
10
2
0.2
60
27
18
10.5
GHz
ps
ps rms
ps
ps
ps
Deterministic Jitter at 10 Gbps
with ±100mV Overdrive
Random Jitter at 10 Gbps
with ±100mV Overdrive
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.
9
8
24
100
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.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery and to place orders: Hittite Microwave
other
For price, delivery, and to place orders: Analog Devices, Inc.,
Chelmsford, MA 01824
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or
Corporation, 2 Elizabeth Drive,
9106, Norwood, MA 02062-9106
One Technology Way, P.O. Box
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respective owners.
Application Support: Phone: 978-250-3343 or apps@hittite.com
COMPARATORS - SMT
2
KΩ
HMC675LC3C
v10.0514
10 GHz LATCHED COMPARATOR
WITH RSCML OUTPUT STAGE
Dispersion vs. Overdrive Voltage
11
Propagation Delay vs. Common Mode
[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
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
Comparator Hysteresis
vs. Rhys Control Resistor
15
HYSTERESIS (mV)
-0.1
VOLTAGE (V)
-0.2
-0.3
-0.4
-0.5
-0.6
-45
10
5
0
-32
-19
-6
7
20
33
46
59
72
85
100
1000
RESISTANCE (Ohm)
10000
TEMPERATURE (C)
VOH
VOL
Eye Diagram
[1] Vcci = 3.3 V, Vcc0 = 0, Vee = -3 V, V
TERM
= 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery and to place orders: Hittite Microwave
other
For price, delivery, and to place orders: Analog Devices, Inc.,
Chelmsford, MA 01824
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or
Corporation, 2 Elizabeth Drive,
9106, Norwood, MA 02062-9106
One Technology Way, P.O. Box
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respective owners.
Application Support: Phone: 978-250-3343 or apps@hittite.com
3
HMC675LC3C
v10.0514
10 GHz LATCHED COMPARATOR
WITH RSCML OUTPUT STAGE
Timing Diagram
Symbol
t
PDH
t
PDL
t
PLOH
t
PLOL
t
H
t
PL
t
S
t
R
t
F
V
OD
Timing
Input to output high delay
Input to output low delay
Latch enable to output high delay
Latch enable to output low delay
Minimum hold time
Minimum latch enable pulse width
Minimum setup time
Output rise time
Output fall time
Voltage overdrive
Description
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.
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.
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.
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.
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.
Minimum time that the latch enable signal must be low to acquire an input signal
change.
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.
Amount of time required to transition from a low to a high output as measured at the
20% and 80% points.
Amount of time required to transition from a high to a low output as measured at the
20% and 80% points.
Difference between the input voltages V
INP
and V
INN-
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery and to place orders: Hittite Microwave
other
For price, delivery, and to place orders: Analog Devices, Inc.,
Chelmsford, MA 01824
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or
Corporation, 2 Elizabeth Drive,
9106, Norwood, MA 02062-9106
One Technology Way, P.O. Box
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respective owners.
Application Support: Phone: 978-250-3343 or apps@hittite.com
COMPARATORS - SMT
4
HMC675LC3C
v10.0514
10 GHz LATCHED COMPARATOR
WITH RSCML OUTPUT STAGE
Operational Description
COMPARATORS - SMT
5
The HMC675LC3C is a Latched Comparator with 10 GHz equivalent input bandwidth. The device is comprised of three
blocks: 1) An input amplifier, 2) A latch, and 3) An RSCML Output Buffer. The latching circuit is level sensitive, and
consists of a single high-speed latch. The HMC675LC3C comparator supports 10 Gb/s operation. The minimum input
data latching pulse width is 60 ps.
The HMC675LC3C 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
floating. 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.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery and to place orders: Hittite Microwave
other
For price, delivery, and to place orders: Analog Devices, Inc.,
Chelmsford, MA 01824
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or
Corporation, 2 Elizabeth Drive,
9106, Norwood, MA 02062-9106
One Technology Way, P.O. Box
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Phone: 781-329-4700 • Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application Support: Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the property of their respective owners.
Application Support: Phone: 978-250-3343 or apps@hittite.com
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