AD ADCMP607 Rail-to-rail, very fast, 2.5 v to 5.5 v, single-supply cml comparator Datasheet

Rail-to-Rail, Very Fast, 2.5 V to 5.5 V,
Single-Supply CML Comparators
ADCMP606/ADCMP607
FEATURES
GENERAL DESCRIPTION
Fully specified rail to rail at VCCI = 2.5 V to 5.5 V
Input common-mode voltage from −0.2 V to VCCI + 0.2 V
CML-compatible output stage
1.25 ns propagation delay
50 mW @ 2.5 V power supply
Shutdown pin
Single-pin control for programmable hysteresis and latch
(ADCMP607 only)
Power supply rejection > 60 dB
−40°C to +125°C operation
The ADCMP606 and ADCMP607 are very fast comparators
fabricated on XFCB2, an Analog Devices, Inc., proprietary
process. These comparators are exceptionally versatile and easy
to use. Features include an input range from VEE − 0.5 V to
VCCI + 0.2 V, low noise, CML-compatible output drivers, and
TTL-/CMOS-compatible latch inputs with adjustable hysteresis
and/or shutdown inputs.
APPLICATIONS
A flexible power supply scheme allows the devices to operate
with a single +2.5 V positive supply and a −0.5 V to +2.7 V
input signal range up to a +5.5 V positive supply with a −0.5 V
to +5.7 V input signal range. The ADCMP607 features split
input/output supplies with no sequencing restrictions to
support a wide input signal range with independent output
swing control and power savings.
The devices offer 1.25 ns propagation delay with 2.5 ps rms
random jitter (RJ). Overdrive and slew rate dispersion are
typically less than 50 ps.
High speed instrumentation
Clock and data signal restoration
Logic level shifting or translation
Pulse spectroscopy
High speed line receivers
Threshold detection
Peak and zero-crossing detectors
High speed trigger circuitry
Pulse-width modulators
Current-/voltage-controlled oscillators
Automatic test equipment (ATE)
The CML-compatible output stage is fully back-matched for
superior performance. The comparator input stage offers robust
protection against large input overdrive, and the outputs do not
phase reverse when the valid input signal range is exceeded. On
the ADCMP607, latch and programmable hysteresis features are
also provided with a unique single-pin control option.
The ADCMP606 is available in a 6-lead SC70 package and the
ADCMP607 is available in a 12-lead LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
VCCI
VCCO
(ADCMP607 ONLY)
VP NONINVERTING
INPUT
Q OUTPUT
ADCMP606/
ADCMP607
CML
LE/HYS INPUT (ADCMP607 ONLY)
SDN INPUT (ADCMP607 ONLY)
05917-001
Q OUTPUT
VN INVERTING
INPUT
Figure 1.
Rev. A
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Fax: 781.461.3113 ©2006–2007 Analog Devices, Inc. All rights reserved.
ADCMP606/ADCMP607
TABLE OF CONTENTS
Features .............................................................................................. 1
Application Information................................................................ 10
Applications....................................................................................... 1
Power/Ground Layout and Bypassing..................................... 10
General Description ......................................................................... 1
CML-Compatible Output Stage ............................................... 10
Functional Block Diagram .............................................................. 1
Using/Disabling the Latch Feature........................................... 10
Revision History ............................................................................... 2
Optimizing Performance........................................................... 10
Specifications..................................................................................... 3
Comparator Propagation Delay Dispersion ........................... 11
Electrical Characteristics............................................................. 3
Comparator Hysteresis .............................................................. 11
Timing Information ..................................................................... 5
Crossover Bias Points................................................................. 12
Absolute Maximum Ratings............................................................ 6
Minimum Input Slew Rate Requirement ................................ 12
Thermal Resistance ...................................................................... 6
Typical Application Circuits ......................................................... 13
ESD Caution.................................................................................. 6
Outline Dimensions ....................................................................... 14
Pin Configurations and Function Descriptions ........................... 7
Ordering Guide .......................................................................... 14
Typical Performance Characteristics ............................................. 8
REVISION HISTORY
8/07—Rev. 0 to Rev. A
Changes to Specifications Section.................................................. 3
Changes to Table 3............................................................................ 6
Changes to Ordering Guide .......................................................... 14
10/06—Revision 0: Initial Version
Rev. A | Page 2 of 16
ADCMP606/ADCMP607
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VCCI = VCCO = 2.5 V, TA = −40°C to +125°C, typical at TA = 25°C, unless otherwise noted.
Table 1.
Parameter
DC INPUT CHARACTERISTICS
Voltage Range
Common-Mode Range
Differential Voltage
Offset Voltage
Bias Current
Offset Current
Capacitance
Resistance, Differential Mode
Resistance, Common Mode
Active Gain
Common-Mode Rejection Ratio
Hysteresis
LATCH ENABLE PIN CHARACTERISTICS
(ADCMP607 Only)
VIH
VIL
IIH
IIL
HYSTERESIS MODE AND TIMING
Hysteresis Mode Bias Voltage
Minimum Resistor Value
Latch Setup Time
Latch Hold Time
Latch-to-Output Delay
Latch Minimum Pulse Width
SHUTDOWN PIN CHARACTERISTICS
(ADCMP607 Only)
VIH
VIL
IIH
IIL
Sleep Time
Wake-Up Time
DC OUTPUT CHARACTERISTICS
Output Voltage High Level
Output Voltage Low Level
Output Voltage Differential
Symbol
Conditions
Min
VP, VN
VCCI = 2.5 V to 5.5 V
VCCI = 2.5 V to 5.5 V
VCCI = 2.5 V to 5.5 V
−0.5
−0.2
VOS
IP, IN
−5.0
−5.0
−2.0
±2
−0.1 V to VCCI
−0.5 V to VCCI + 0.5 V
200
100
1
700
350
85
VCCI = 2.5 V, VCCO = 2.5 V,
VCM = −0.2 V to +2.7 V
VCCI = 2..5 V, VCCO = 5.5 V
RHYS = ∞
50
Hysteresis is shut off
Latch mode guaranteed
VIH = VCCO
VIL = 0.4 V
2.0
−0.2
−6
−0.1
Current sink 0 μA
Hysteresis = 120 mV
VOD = 50 mV
VOD = 50 mV
VOD = 50 mV
VOD = 50 mV
1.145
55
Comparator is operating
Shutdown guaranteed
VIH = VCCO
VIL = 0 V
10% output swing
VOD = 100 mV, output valid
VCCO = 2.5 V to 5.5 V
50 Ω terminate to VCCO
50 Ω terminate to VCCO
50 Ω terminate to VCCO
2.0
−0.2
−6
CP, CN
AV
CMRR
tS
tH
tPLOH, tPLOL
tPL
tSD
tH
VOH
VOL
Typ
Rev. A | Page 3 of 16
Max
Unit
VCCI + 0.2
VCCI + 0.2
VCCI
+5.0
+5.0
2.0
V
V
V
mV
μA
μA
pF
kΩ
kΩ
dB
dB
50
dB
mV
<0.1
+0.4
1.25
75
−1.5
2.3
30
25
+0.4
VCCO
+0.8
+6
+0.1
V
V
μA
mA
1.35
110
V
kΩ
ns
ns
ns
ns
VCCO
+0.6
+6
−0.1
V
V
μA
mA
ns
ns
VCCO
VCCO − 0.3
500
V
V
mV
<1
35
VCCO − 0.1
VCCO − 0.6
300
VCCO − 0.05
VCCO − 0.45
400
ADCMP606/ADCMP607
Parameter
AC PERFORMANCE 1
Rise Time/Fall time
Propagation Delay
Conditions
tR/tF
10% to 90%,
VCCI = VCCO = 2.5 V to 5.5 V
VCCI = VCCO = 2.5 V to 5.5 V,
VOD = 50 mV
VCCI = VCCO = 2.5 V,
VOD = 10 mV
VOD = 50 mV
tPD
Propagation Delay Skew—Rising to
Falling Transition
Overdrive Dispersion
Common-Mode Dispersion
Input Stage Bandwidth
RMS Random Jitter
Minimum Pulse Width
TPINSKEW
Output Skew Q to Q
TDIFFSKEW
POWER SUPPLY
Input Supply Voltage Range
Output Supply Voltage Range
Positive Supply Differential (ADCMP607)
Positive Supply Current (ADCMP606)
Input Section Supply Current (ADCMP607)
Output Section Supply Current (ADCMP607)
Power Dissipation
Power Supply Rejection Ratio
Shutdown Mode ICCI
Shutdown Mode ICCO
1
Symbol
Min
10 mV < VOD < 125 mV
−0.2 V < VCM < VCC + 0.2 V
RJ
PWMIN
VCCI
VCCO
VCCI − VCCO
VCCI − VCCO
IVCCI/VCCO
IVCCI
IVCCO
IVCCO
PD
PD
PSRR
VOD = 200 mV, 0.5 V/ns
VCCI = VCCO = 5.5 V,
PWOUT = 90% of PWIN
50%
Operating
Nonoperating
VCCI = VCCO = 2.5 V
VCCI = VCCO = 5.5 V
VCCI = 2.5 V
VCCO = 2.5 V
VCCO= 5.5 V
VCCI = VCCO = 2.5 V
VCCI = VCCO = 5.5 V
VCCI = 2.5 V to 5 V
VCCI = VCCO = 2.5 V to 5 V
VCCI = VCCO = 2.5 V to 5 V
VIN = 100 mV square input at 50 MHz, VCM = 2.5 V, VCCI = VCCO = 2.5 V, unless otherwise noted.
Rev. A | Page 4 of 16
2.5
2.5
−3.0
−6
11
16
0.5
10
16
30
90
−50
200
−30
Typ
Max
Unit
160
ps
1.2
ns
2.1
ns
40
ps
2.3
150
750
2
1.1
ns
ps
MHz
ps
ns
20
ps
17.5
20.5
1.1
15.8
18
46
110
240
5.5
5.5
+3.0
+6
21
26
1.5
18
25
55
150
800
30
V
V
V
V
mA
mA
mA
mA
mA
mW
mW
dB
μA
μA
ADCMP606/ADCMP607
TIMING INFORMATION
Figure 2 illustrates the ADCMP606/ADCMP607 latch timing relationships. Table 2 provides definitions of the terms shown in Figure 2.
1.1V
LATCH ENABLE
tS
tPL
tH
DIFFERENTIAL
INPUT VOLTAGE
VIN
VN ± VOS
VOD
tPDL
tPLOH
Q OUTPUT
50%
tF
tPDH
tPLOL
tR
05917-025
50%
Q OUTPUT
Figure 2. System Timing Diagram
Table 2. Timing Descriptions
Symbol
tF
Timing
Output fall time
tH
Minimum hold time
tPDH
Input to output high delay
tPDL
Input to output low delay
tPL
Minimum latch enable pulse width
tPLOH
Latch enable to output high delay
tPLOL
Latch enable to output low delay
tR
Output rise time
tS
Minimum setup time
VOD
Voltage overdrive
Description
Amount of time required to transition from a high to a low output as measured at the 20%
and 80% points.
Minimum time after the negative transition of the latch enable signal that the input signal
must remain unchanged to be acquired and held at the outputs.
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.
Minimum time that the latch enable signal must be high to acquire an input signal
change.
Propagation delay measured from the 50% point of the latch enable signal low-to-high
transition to the 50% point of an output low-to-high transition.
Propagation delay measured from the 50% point of the latch enable signal low-to-high
transition to the 50% point of an output high-to-low transition.
Amount of time required to transition from a low to a high output as measured at the 20%
and 80% points.
Minimum time before the negative transition of the latch enable signal occurs that an
input signal change must be present to be acquired and held at the outputs.
Difference between the input voltages VA and VB.
Rev. A | Page 5 of 16
ADCMP606/ADCMP607
ABSOLUTE MAXIMUM RATINGS
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Table 3.
Parameter
Supply Voltages
Input Supply Voltage (VCCI to GND)
Output Supply Voltage
(VCCO to GND)
Positive Supply Differential
(VCCI − VCCO)
Input Voltages
Input Voltage
Differential Input Voltage
Maximum Input/Output Current
Shutdown Control Pin
Applied Voltage (SDN to GND)
Maximum Input/Output Current
Latch/Hysteresis Control Pin
Applied Voltage (HYS to GND)
Maximum Input/Output Current
Output Current
Temperature
Operating Temperature, Ambient
Operating Temperature, Junction
Storage Temperature Range
Rating
−0.5 V to +6.0 V
−0.5 V to +6.0 V
−6.0 V to +6.0 V
THERMAL RESISTANCE
−0.5 V to VCCI + 0.5 V
±(VCCI + 0.5 V)
±50 mA
−0.5 V to VCCO + 0.5 V
±50 mA
−0.5 V to VCCO + 0.5 V
±50 mA
±50 mA
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
Package Type
ADCMP606 6-Lead SC70
ADCMP607 12-Lead LFCSP
1
Measurement in still air.
ESD CAUTION
−40°C to +125°C
150°C
−65°C to +150°C
Rev. A | Page 6 of 16
θJA1
426
62
Unit
°C/W
°C/W
ADCMP606/ADCMP607
5 VCCI /VCCO
TOP VIEW
(Not to Scale)
4
VN
VEE 3
Figure 3. ADCMP606 Pin Configuration
10 Q
ADCMP607
TOP VIEW
(Not to Scale)
VP 4
VP 3
VCCI 2
PIN 1
INDICATOR
9 VEE
8 LE/HYS
7 SDN
05917-003
VCCO 1
VN 6
Q
05917-002
VEE 2
6
ADCMP606
VEE 5
Q 1
11 VEE
12 Q
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Figure 4. ADCMP607 Pin Configuration
Table 5. ADCMP606 (6-Lead SC70) Pin Function Descriptions
Pin No.
1
Mnemonic
Q
2
3
4
5
6
VEE
VP
VN
VCCI/VCCO
Q
Description
Noninverting Output. Q is at logic high if the analog voltage at the noninverting input, VP, is greater than
the analog voltage at the inverting input, VN.
Negative Supply Voltage.
Noninverting Analog Input.
Inverting Analog Input.
Input Section Supply/Output Section Supply. Shared pin.
Inverting Output. Q is at logic low if the analog voltage at the noninverting input, VP, is greater than the
analog voltage at the inverting input, VIN.
Table 6. ADCMP607 (12-Lead LFCSP) Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
Mnemonic
VCCO
VCCI
VEE
VP
VEE
VN
SDN
LE/HYS
VEE
Q
11
12
VEE
Q
Heat Sink
Paddle
VEE
Description
Output Section Supply.
Input Section Supply.
Negative Supply Voltage.
Noninverting Analog Input.
Negative Supply Voltage.
Inverting Analog Input.
Shutdown. Drive this pin low to shut down the device.
Latch/Hysteresis Control. Bias with resistor or current for hysteresis adjustment; drive low to latch.
Negative Supply Voltage.
Inverting Output. Q is at logic low if the analog voltage at the noninverting input, VP, is greater than the
analog voltage at the inverting input, VN, if the comparator is in compare mode.
Negative Supply Voltage.
Noninverting Output. Q is at logic high if the analog voltage at the noninverting input, VP, is greater than
the analog voltage at the inverting input, VN, if the comparator is in compare mode.
The metallic back surface of the package is electrically connected to VEE. It can be left floating because
Pin 3, Pin 5, Pin 9, and Pin 11 provide adequate electrical connection. It can also be soldered to the
application board if improved thermal and/or mechanical stability is desired.
Rev. A | Page 7 of 16
ADCMP606/ADCMP607
TYPICAL PERFORMANCE CHARACTERISTICS
VCCI = VCCO = 2.5 V, TA = 25°C, unless otherwise noted.
250
800
600
200
400
VCC = 5.5V
HYSTERESIS (mV)
CURRENT (µA)
VCC = 2.5V
200
0
–200
150
–40°C
100
+25°C
–400
50
–600
1
2
3
4
LE/HYS PIN (V)
5
6
7
05917-026
0
0
0
–2
Figure 5. LE/HYS Pin Current vs. Voltage
400
150
350
–16
–18
300
VCC = 2.5V
HYSTERESIS (mV)
100
VCC = 5.5V
50
0
–50
250
200
150
VCC = 2.5V
100
–100
50
0
1
2
3
4
SDN PIN (V)
5
6
7
0
05917-007
–1
50
100 150 200 250 300 350 400 450 500 550 600 650
HYS RESISTOR (kΩ)
Figure 6. SDN Pin Current vs. Voltage
05917-005
CURRENT (µA)
–6
–8
–10
–12
–14
LE/HYS PIN CURRENT (µA)
Figure 8. Hysteresis vs. LE/HYS Pin Current
200
–150
–4
05917-004
+125°C
–800
–1
Figure 9. Hysteresis vs. Hysteresis Resistor
10
3.5
8
6
4
0
–2
–4
–40°C
–6
+25°C
–8
–10
–1.0
2.5
2.0
PROPAGATION DELAY FALL
1.5
+125°C
–0.5
0
0.5
1.0
1.5
2.0
VCM AT VCC = 2.5V
2.5
3.0
3.5
1.0
05917-006
IB (µA)
2
Figure 7. Input Bias Current vs. Input Common-Mode Voltage
PROPAGATION DELAY RISE
0
10
20 30
40 50 60 70 80 90 100 110 120 130 140
OVERDRIVE (mV)
Figure 10. Propagation Delay vs. Input Overdrive
Rev. A | Page 8 of 16
05917-009
PROPAGATION DELAY (ns)
3.0
ADCMP606/ADCMP607
1.4
PROPAGATION DELAY FALL ns
5.550V
1.3
1.2
PROPAGATION DELAY RISE ns
0.2
0.6
1.0
1.4
1.8
2.2
VCM AT VCC = 2.5V
2.6
05917-010
Q
1.1
–0.2
3.0
5.050V
Figure 13. Output Waveform at VCC = 5.5 V
Figure 11. Propagation Delay vs. Input Common-Mode Voltage
2.550V
Q
1.000ns/DIV
05917-011
Q
2.050V
1.000ns/DIV
Figure 12 .Output Waveform at VCC = 2.5 V
Rev. A | Page 9 of 16
05917-012
PROPAGATION DELAY (ns)
Q
ADCMP606/ADCMP607
APPLICATION INFORMATION
POWER/GROUND LAYOUT AND BYPASSING
The ADCMP606/ADCMP607 comparators are very high speed
devices. Despite the low noise output stage, it is essential to use
proper high speed design techniques to achieve the specified
performance. Because comparators are uncompensated amplifiers,
feedback in any phase relationship is likely to cause oscillations
or undesired hysteresis. Of critical importance is the use of low
impedance supply planes, particularly the output supply plane
(VCCO) and the ground plane (GND). Individual supply planes
are recommended as part of a multilayer board. Providing the
lowest inductance return path for switching currents ensures
the best possible performance in the target application.
It is also important to adequately bypass the input and output
supplies. Multiple high quality 0.01 μF bypass capacitors should
be placed as close as possible to each of the VCCI and VCCO supply
pins and should be connected to the GND plane with redundant
vias. At least one of these should be placed to provide a physically
short return path for output currents flowing back from ground
to the VCCI and VCCO pins. High frequency bypass capacitors
should be carefully selected for minimum inductance and ESR.
Parasitic layout inductance should also be strictly controlled to
maximize the effectiveness of the bypass at high frequencies.
CML-COMPATIBLE OUTPUT STAGE
Specified propagation delay dispersion performance can be
achieved by using proper transmission line terminations. The
outputs of the ADCMP606 and ADCMP607 are designed to drive
400 mV directly into a 50 Ω cable or into transmission lines
terminated using either microstrip or strip line techniques with
50 Ω referenced to VCCO. The CML output stage is shown in the
simplified schematic diagram in Figure 14. Each output is backterminated with 50 Ω for best transmission line matching.
VCCO
50Ω
Q
Q
GND
05917-013
16mA
Figure 14. Simplified Schematic Diagram of
CML-Compatible Output Stage
If these high speed signals must be routed more than a centimeter,
then either microstrip or strip line techniques are required to
ensure proper transition times and to prevent excessive output
ringing and pulse width dependent propagation delay
dispersion.
It is also possible to operate the outputs with the internal
termination only if greater output swing is desired. This can be
especially useful for driving inputs on CMOS devices intended
for full swing ECL and PECL, or for generating pseudo PECL
levels. To avoid deep saturation of the outputs and resulting
pulse dispersion, VCCO must be kept above the specified
minimum output low level (see the Electrical Characteristics
section). The line length driven should be kept as short as
possible.
USING/DISABLING THE LATCH FEATURE
The latch input is designed for maximum versatility. It can
safely be left floating or it can be driven low by any standard
TTL/CMOS device as a high speed latch.
In addition, the pin can be operated as a hysteresis control pin
with a bias voltage of 1.25 V nominal and an input resistance of
approximately 70 kΩ. This allows the comparator hysteresis to
be easily controlled by either a resistor or an inexpensive CMOS
DAC. Driving this pin high or floating the pin removes all
hysteresis.
Hysteresis control and latch mode can be used together if an
open-drain, an open-collector, or a three-state driver is connected parallel to the hysteresis control resistor or current source.
Due to the programmable hysteresis feature, the logic threshold
of the latch pin is approximately 1.1 V regardless of VCCO.
OPTIMIZING PERFORMANCE
As with any high speed comparator, proper design and layout
techniques are essential for obtaining the specified performance.
Stray capacitance, inductance, inductive power and ground
impedances, or other layout issues can severely limit performance
and often cause oscillation. Large discontinuities along input
and output transmission lines can also limit the specified pulse
width dispersion performance. The source impedance should
be minimized as much as is practicable. High source impedance,
in combination with the parasitic input capacitance of the
comparator, causes an undesirable degradation in bandwidth at
the input, thus degrading the overall response. Thermal noise
from large resistances can easily cause extra jitter with slowly
slewing input signals; higher impedances encourage undesired
coupling.
Rev. A | Page 10 of 16
ADCMP606/ADCMP607
The ADCMP606/ADCMP607 comparators are designed to
reduce propagation delay dispersion over a wide input overdrive
range of 5 mV to VCCI − 1 V. Propagation delay dispersion is the
variation in propagation delay that results from a change in the
degree of overdrive or slew rate (that is, how far or how fast the
input signal exceeds the switching threshold).
switching threshold becomes −VH/2. The comparator remains in
the high state until the new threshold, −VH/2, is crossed from
below the threshold region in a negative direction. In this manner,
noise or feedback output signals centered on 0 V input cannot
cause the comparator to switch states unless it exceeds the region
bounded by ±VH/2.
OUTPUT
Propagation delay dispersion is a specification that becomes
important in high speed, time-critical applications, such as data
communication, automatic test and measurement, and instrumentation. It is also important in event-driven applications, such
as pulse spectroscopy, nuclear instrumentation, and medical
imaging. Dispersion is defined as the variation in propagation
delay as the input overdrive conditions are changed (Figure 15
and Figure 16).
The device dispersion is typically 2.3 ns as the overdrive varies
from 10 mV to 125 mV. This specification applies to both
positive and negative signals because each device has very closely
matched delays for positive-going and negative-going inputs as
well as very low output skews.
500mV OVERDRIVE
INPUT VOLTAGE
10mV OVERDRIVE
VN ± VOS
Q/Q OUTPUT
VOL
–VH
2
0
+VH
2
INPUT
Figure 17. Comparator Hysteresis Transfer Function
The customary technique for introducing hysteresis into a
comparator uses positive feedback from the output back to
the input. One limitation of this approach is that the amount
of hysteresis varies with the output logic levels, resulting in
hysteresis that is not symmetric about the threshold. The
external feedback network can also introduce significant
parasitics that reduce high speed performance and induce
oscillation in some cases.
This ADCMP607 comparator offers a programmable hysteresis
feature that can significantly improve accuracy and stability.
Connecting an external pull-down resistor or a current source
from the LE/HYS pin to GND, varies the amount of hysteresis
in a predictable, stable manner. Leaving the LE/HYS pin disconnected or driving this pin high removes hysteresis. The maximum
hysteresis that can be applied using this pin is approximately
160 mV. Figure 18 illustrates typical hysteresis applied as a
function of the external resistor value, and Figure 7 illustrates
typical hysteresis as a function of the current.
05917-014
DISPERSION
VOH
05917-016
COMPARATOR PROPAGATION DELAY
DISPERSION
Figure 15. Propagation Delay—Overdrive Dispersion
INPUT VOLTAGE
1V/ns
VN ± VOS
10V/ns
400
350
Figure 16. Propagation Delay—Slew Rate Dispersion
COMPARATOR HYSTERESIS
The addition of hysteresis to a comparator is often desirable in
a noisy environment, or when the differential input amplitudes
are relatively small or slow moving. Figure 17 shows the transfer
function for a comparator with hysteresis. As the input voltage
approaches the threshold (0 V, in this example) from below the
threshold region in a positive direction, the comparator switches
from low to high when the input crosses +VH/2, and the new
Rev. A | Page 11 of 16
250
200
150
VCC = 2.5V
100
50
0
50
100 150 200 250 300 350 400 450 500 550 600 650
HYS RESISTOR (kΩ)
Figure 18. Hysteresis vs. RHYS Control Resistor
05917-017
HYSTERESIS (mV)
Q/Q OUTPUT
05917-015
300
DISPERSION
ADCMP606/ADCMP607
The hysteresis control pin appears as a 1.25 V bias voltage seen
through a series resistance of 70 kΩ ± 20% throughout the
hysteresis control range. The advantages of applying hysteresis in
this manner are improved accuracy, improved stability, reduced
component count, and maximum versatility. An external bypass
capacitor is not recommended on the LE/HYS pin because it
impairs the latch function and often degrades the jitter performance of the device. As described in the Using/Disabling the
Latch Feature section, hysteresis control need not compromise
the latch function.
CROSSOVER BIAS POINTS
In both op amps and comparators, rail-to-rail inputs of this type
have a dual front-end design. Certain devices are active near the
VCCI rail and others are active near the VEE rail. At some predetermined point in the common-mode range, a crossover occurs. At
this point, normally VCCI/2, the direction of the bias current
reverses and the measured offset voltages and currents change.
The ADCMP606/ADCMP607 comparators slightly elaborate
on this scheme. Crossover points are found at approximately
0.6 V and 1.6 V common mode.
MINIMUM INPUT SLEW RATE REQUIREMENT
With the rated load capacitance and normal good PCB design
practice, as discussed in the Optimizing Performance section,
these comparators should be stable at any input slew rate with
no hysteresis. Broadband noise from the input stage is observed
in place of the violent chattering seen with most other high
speed comparators. With additional capacitive loading or poor
bypassing, oscillation is observed. This oscillation is due to the
high gain bandwidth of the comparator in combination with
feedback parasitics in the package and PC board. In many
applications, chattering is not harmful.
Rev. A | Page 12 of 16
ADCMP606/ADCMP607
TYPICAL APPLICATION CIRCUITS
2.5V TO 5V
5V
0.1µF
2kΩ
2kΩ
50Ω
50Ω
CML
OUTPUT
ADCMP606
50Ω
CML
PWM
OUTPUT
ADCMP606
05917-018
INPUT
50Ω
0.1µF
INPUT
2.5V
±50mV
Figure 19. Self-Biased, 50% Slicer
INPUT
2.5V
REF
10kΩ
10kΩ
3.3V
ADCMP601
50Ω
10kΩ
LVDS
ADCMP606
100kΩ
05917-019
100Ω
LE/HYS
150pF
CML
OUTPUT
05917-022
50Ω
Figure 20. LVDS to CML
Figure 23. Oscillator and Pulse-Width Modulator
2.5V TO 5V
5V
50Ω
10kΩ
50Ω
50Ω
50Ω
ADCMP607
CML
OUTPUT
LE/HYS
DIGITAL
INPUT
150kΩ
05917-020
10kΩ
CONTROL
CURRENT
10kΩ
CONTROL
VOLTAGE
0V TO 2.5V
Figure 21. Current-Controlled Oscillator
3.3V
VCCI 1N4001
LE/HYS
74 VHC
1G07
05917-023
ADCMP607
150kΩ
Figure 24. Hysteresis Adjustment with Latch
+2.5V – 3V
VCCI
VCCO
VCCO
50Ω
50Ω
100Ω
ADCMP607
ADCMP607
3.3V
PECL
05917-021
LVDS
50Ω
50Ω
–2.5V
VEE
Figure 22. Fake PECL Levels Using a Series Diode
OUTPUT
05917-024
82pF
Figure 25. Ground-Referenced CML with ±3 V Input Range
Rev. A | Page 13 of 16
ADCMP606/ADCMP607
OUTLINE DIMENSIONS
2.20
2.00
1.80
1.35
1.25
1.15
6
5
4
1
2
3
2.40
2.10
1.80
PIN 1
0.65 BSC
1.30 BSC
1.00
0.90
0.70
1.10
0.80
0.30
0.15
0.10 MAX
0.40
0.10
0.46
0.36
0.26
0.22
0.08
SEATING
PLANE
0.10 COPLANARITY
COMPLIANT TO JEDEC STANDARDS MO-203-AB
Figure 26. 6-Lead Thin Shrink Small Outline Transistor Package [SC70]
(KS-6)
Dimensions shown in millimeters
3.00
BSC SQ
0.60 MAX
0.45
PIN 1
INDICATOR
0.75
0.55
0.35
9
2.75
BSC SQ
TOP
VIEW
10
11 12
8
12° MAX
SEATING
PLANE
6
5
4
3
0.25 MIN
0.50
BSC
0.80 MAX
0.65 TYP
1.00
0.85
0.80
*1.45
1.30 SQ
1.15
2
7
EXPOSED PAD
(BOTTOM VIEW)
1
PIN 1
INDICATOR
0.05 MAX
0.02 NOM
0.30
0.23
0.18
0.20 REF
COPLANARITY
0.08
*COMPLIANT TO JEDEC STANDARDS MO-220-VEED-1
EXCEPT FOR EXPOSED PAD DIMENSION.
Figure 27. 12-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
3 mm × 3 mm Body, Very Thin Quad
(CP-12-1)
Dimensions shown in millimeters
ORDERING GUIDE
Model
ADCMP606BKSZ-R2 1
ADCMP606BKSZ-RL1
ADCMP606BKSZ-REEL71
ADCMP607BCPZ-R21
ADCMP607BCPZ-R71
ADCMP607BCPZ-WP1
1
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
6-Lead Thin Shrink Small Outline Transistor Package [SC70]
6-Lead Thin Shrink Small Outline Transistor Package [SC70]
6-Lead Thin Shrink Small Outline Transistor Package [SC70]
12-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
12-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
12-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
Z = RoHS Compliant Part.
Rev. A | Page 14 of 16
Package
Option
KS-6
KS-6
KS-6
CP-12-1
CP-12-1
CP-12-1
Branding
G0S
G0S
G0S
G0H
G0H
G0H
ADCMP606/ADCMP607
NOTES
Rev. A | Page 15 of 16
ADCMP606/ADCMP607
NOTES
©2006–2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05917-0-8/07(A)
Rev. A | Page 16 of 16