HMC676LC3C
v09.0514
10 GHz LATCHED COMPARATOR
WITH RSECL OUTPUT STAGE
Typical Applications
The HMC676LC3C 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
Power Dissipation: 120 mW
Differential Latch Control
COMPARATORS - SMT
• ATE Applications
• High Speed Instrumentation
• Digital Receiver Systems
• Pulse Spectroscopy
• High Speed Trigger Circuits
• Clock & Data Restoration
RSCML and RSPECL Versions Available
16 Lead 3x3 mm SMT Package: 9 mm
2
Functional Diagram
General Description
O
Parameter
Electrical Specifications,
T
A
= +25 °C,
Vcci= +3.3 V, Vcco = 0 V, Vee = -3 V, V
TERM
= -2 V
Conditions
Min.
-2
-1.75
±5
15
15
50
4
50
350
15
45
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 Voltage Range
Input Differential Voltage
Input Offset Voltage
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
Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
For price, delivery and to place orders: Hittite
reliable. However, no
For price, delivery, and to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from
978-250-3343
subject to change without notice. No
Phone:
its use. Specifications
Fax: 978-250-3373
Phone: 781-329-4700
www.hittite.com
Order On-line at
• 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
B
SO
The HMC676LC3C is a SiGe monolithic, ultra fast
comparator that features reduced swing (RS) ECL
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 ECL output stage
is designed to directly drive 400 mV into 50 ohms
terminated to -2 V. The HMC676LC3C features high
speed latch and programmable hysteresis and may
be configured to operate in either latch mode, or as a
tracking comparator.
LE
TE
HMC676LC3C
v09.0514
10 GHz LATCHED COMPARATOR
WITH RSECL 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
Min.
Typ.
8
85
20
2.4
Max
Units
ps
ps
V
ps
ps
DC Output Characteristics,
with 50 Ω to Vcco - 2 V
Parameter
Output Voltage High Level, Voh
Output Voltage Low Level, Vol
Output Voltage Differential Swing
Conditions
TE
Min.
Typ.
Max
-0.89
-1.21
320
-0.89
-1.25
350
-0.95
-1.35
400
Min.
70
Typ.
100
Max
130
0.45
10
10
3
5.9
9
10
2
0.2
60
16
23
13
Min.
Typ.
8
45
16
120
38
38
Max
-42
Units
V
V
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
LE
Conditions
VOD = 500 mV
VOD - 500 mV
50m V < VOD < 1 V
VOD = 500 mV
Deterministic Jitter at 10 Gbps
with ±100 mV Overdrive
Random Jitter at 10 Gbps
with ±100 mV Overdrive
From 20% to 80%
From 20% to 80%
Conditions
Units
ps
ps / °C
ps
ps
ps
nV/√(Hz) RTI
GHz
ps
ps rms
ps
ps
ps
t
PD
vs. Common Mode Dispersion,
-1.75 V <Vcm <1.75 V
Noise (RTI)
[1]
Equivalent Input Bandwidth
Deterministic Jitter (pp)
Random Jitter (rms)
Input Signal Minimum Pulse Width
Q / QB Rise Time
Q / QB Fall Time
O
Power Supply Requirements
Parameter
Input Supply Current, Icci
Output Supply Current, Icco
Vee Current, lee
Power Dissipation, Pd
PSRR, Vcci
PSRR, Vee
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
and to
is believed to be accurate and
Microwave Corporation, 2 Elizabeth
to place
Chelmsford, MA 01824
For price, delivery
Devices
place orders: Hittite
reliable. However, no
For price, delivery, and
Drive,
orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from
978-250-3343
subject to change without notice. No
Phone:
its use. Specifications
Fax: 978-250-3373
Phone: 781-329-4700
www.hittite.com
Order On-line at
• 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
B
SO
COMPARATORS - SMT
2
KΩ
HMC676LC3C
v09.0514
10 GHz LATCHED COMPARATOR
WITH RSECL OUTPUT STAGE
Dispersion vs. Overdrive Voltage
11
Propagation Delay vs. Common Mode
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
TE
0
-2.5
-5
-2
-1.5
-1
-0.5
0
0.5
1
COMMON MODE VOLTAGE (mV)
Rising Edge
Falling Edge
1.5
2
Output Voltage vs. Temperature
-0.6
HYSTERESIS (mV)
-0.8
VOLTAGE (Volts)
-1
SO
7
20
33
46
59
72
85
TEMPERATURE (C)
VOH
VOL
-1.2
-1.4
-45
-32
-19
-6
LE
15
10
5
0
100
Comparator Hysteresis
vs. Rhys Control Resistor
1000
RESISTANCE (Ohm)
10000
3
O
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, delivery, and
Drive,
orders: Analog Devices, Inc.,
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth
to place
Chelmsford, MA 01824
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from
978-250-3343
subject to change without notice. No
Phone:
its use. Specifications
Fax: 978-250-3373
Phone: 781-329-4700
www.hittite.com
Order On-line at
• 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
B
Eye Diagram
HMC676LC3C
v09.0514
10 GHz LATCHED COMPARATOR
WITH RSECL OUTPUT STAGE
Timing Diagram
Symbol
t
PDH
t
PDL
SO
Timing
B
Input to output high delay
Input to output low delay
O
t
PLOH
t
PLOL
t
H
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
t
PL
t
S
t
R
t
F
V
OD
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price,
Elizabeth
to place orders: Analog Devices, Inc.,
For price, delivery and to place orders: Hittite Microwave Corporation, 2
delivery, and
Drive, Chelmsford, MA 01824
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
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
781-329-4700
www.hittite.com
Phone:
On-line at
• 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
LE
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-
COMPARATORS - SMT
4
TE
HMC676LC3C
v09.0514
10 GHz LATCHED COMPARATOR
WITH RSECL OUTPUT STAGE
Operational Description
COMPARATORS - SMT
The HMC676LC3C 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 RSECL Output Buffer. The latching circuit is level sensitive, and
consists of a single high-speed latch. The HMC676LC3C comparator supports 10 Gb/s operation. The minimum input
data latching pulse width is 60 ps.
The HMC676LC3C 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.
5
O
Information furnished by Analog Devices
place orders: Hittite Microwave Corporation, 2
delivery, and
Drive, Chelmsford, MA 01824
For price, delivery and to
is believed to be accurate and reliable. However, no
For price,
Elizabeth
to place orders: Analog Devices, Inc.,
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
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
781-329-4700
www.hittite.com
Phone:
On-line at
• 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
B
SO
LE
TE
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