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Rail-to-Rail, Very Fast, 2.5 V to 5.5 V, Single-Supply CML Comparators ADCMP606/ADCMP607
FEATURES
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 -40C to +125C operation
GENERAL DESCRIPTION
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. 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. 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 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.
APPLICATIONS
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)
FUNCTIONAL BLOCK DIAGRAM
VCCI VCCO (ADCMP607 ONLY)
VP NONINVERTING INPUT
Q OUTPUT
ADCMP606/ ADCMP607
VN INVERTING INPUT
CML Q OUTPUT
LE/HYS INPUT (ADCMP607 ONLY) SDN INPUT (ADCMP607 ONLY)
Figure 1.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2006-2007 Analog Devices, Inc. All rights reserved.
05917-001
ADCMP606/ADCMP607 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics............................................................. 3 Timing Information ..................................................................... 5 Absolute Maximum Ratings............................................................ 6 Thermal Resistance ...................................................................... 6 ESD Caution.................................................................................. 6 Pin Configurations and Function Descriptions ........................... 7 Typical Performance Characteristics ............................................. 8 Application Information................................................................ 10 Power/Ground Layout and Bypassing..................................... 10 CML-Compatible Output Stage ............................................... 10 Using/Disabling the Latch Feature........................................... 10 Optimizing Performance........................................................... 10 Comparator Propagation Delay Dispersion ........................... 11 Comparator Hysteresis .............................................................. 11 Crossover Bias Points................................................................. 12 Minimum Input Slew Rate Requirement ................................ 12 Typical Application Circuits ......................................................... 13 Outline Dimensions ....................................................................... 14 Ordering Guide .......................................................................... 14
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 = -40C to +125C, typical at TA = 25C, 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 Symbol VP, VN Conditions VCCI = 2.5 V to 5.5 V VCCI = 2.5 V to 5.5 V VCCI = 2.5 V to 5.5 V Min -0.5 -0.2 -5.0 -5.0 -2.0 -0.1 V to VCCI -0.5 V to VCCI + 0.5 V AV CMRR 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 = 200 100 50 50 <0.1 Typ Max VCCI + 0.2 VCCI + 0.2 VCCI +5.0 +5.0 2.0 Unit V V V mV A A pF k k dB dB dB mV
VOS IP, IN CP, CN
2 1 700 350 85
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
Hysteresis is shut off Latch mode guaranteed VIH = VCCO VIL = 0.4 V Current sink 0 A Hysteresis = 120 mV VOD = 50 mV VOD = 50 mV VOD = 50 mV VOD = 50 mV
2.0 -0.2 -6 -0.1 1.145 55
+0.4
VCCO +0.8 +6 +0.1 1.35 110
V V A mA V k ns ns ns ns
tS tH tPLOH, tPLOL tPL
1.25 75 -1.5 2.3 30 25
tSD tH VOH VOL
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 terminate to VCCO 50 terminate to VCCO 50 terminate to VCCO
2.0 -0.2 -6
+0.4
VCCO +0.6 +6 -0.1
<1 35 VCCO - 0.1 VCCO - 0.6 300 VCCO - 0.05 VCCO - 0.45 400 VCCO VCCO - 0.3 500
V V A mA ns ns V V mV
Rev. A | Page 3 of 16
ADCMP606/ADCMP607
Parameter AC PERFORMANCE 1 Rise Time/Fall time Propagation Delay Symbol tR/tF tPD Conditions 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 10 mV < VOD < 125 mV -0.2 V < VCM < VCC + 0.2 V RJ PWMIN TDIFFSKEW 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% 2.5 2.5 -3.0 -6 11 16 0.5 10 16 30 90 -50 200 -30 Min Typ 160 1.2 2.1 40 2.3 150 750 2 1.1 20 5.5 5.5 +3.0 +6 21 26 1.5 18 25 55 150 800 30 Max Unit ps ns ns ps ns ps MHz ps ns ps V V V V mA mA mA mA mA mW mW dB A A
Propagation Delay Skew--Rising to Falling Transition Overdrive Dispersion Common-Mode Dispersion Input Stage Bandwidth RMS Random Jitter Minimum Pulse Width Output Skew Q to Q 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
TPINSKEW
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
17.5 20.5 1.1 15.8 18 46 110 240
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
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 tH
tPL
DIFFERENTIAL INPUT VOLTAGE
VIN VOD
VN VOS
tPDL
Q OUTPUT
tPLOH
50%
tPDH
tF
50%
Q OUTPUT
tR
Figure 2. System Timing Diagram
Table 2. Timing Descriptions
Symbol tF tH tPDH tPDL tPL tPLOH tPLOL tR tS VOD Timing Output fall time Minimum hold time Input to output high delay Input to output low delay Minimum latch enable pulse width Latch enable to output high delay Latch enable to output low delay Output rise time Minimum setup time 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
05917-025
tPLOL
ADCMP606/ADCMP607 ABSOLUTE MAXIMUM RATINGS
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
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.
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 -40C to +125C 150C -65C to +150C
JA 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
JA1 426 62
Unit C/W C/W
Measurement in still air.
ESD CAUTION
Rev. A | Page 6 of 16
ADCMP606/ADCMP607 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
11 VEE 12 Q
Q1 VEE 2 VP 3
6
Q
ADCMP606
VCCO 1
PIN 1 INDICATOR
10 Q
9 VEE 8 LE/HYS 7 SDN
4
VN
05917-002
5 VCCI /VCCO TOP VIEW (Not to Scale)
VCCI 2 VEE 3
ADCMP607
TOP VIEW (Not to Scale)
VEE 5 VN 6
VP 4
Figure 3. ADCMP606 Pin Configuration
Figure 4. ADCMP607 Pin Configuration
Table 5. ADCMP606 (6-Lead SC70) Pin Function Descriptions
Pin No. 1 2 3 4 5 6 Mnemonic Q 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 11 12 Heat Sink Paddle Mnemonic VCCO VCCI VEE VP VEE VN SDN LE/HYS VEE Q VEE Q 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
05917-003
ADCMP606/ADCMP607 TYPICAL PERFORMANCE CHARACTERISTICS
VCCI = VCCO = 2.5 V, TA = 25C, unless otherwise noted.
800 600 200 400 250
CURRENT (A)
200 0 -200 -400
HYSTERESIS (mV)
VCC = 2.5V
VCC = 5.5V
150
100
-40C +25C
50 -600 +125C
05917-026
05917-004
05917-009
05917-005
-800 -1
0
1
2 3 4 LE/HYS PIN (V)
5
6
7
0
0
-2
-4
-6 -8 -10 -12 -14 LE/HYS PIN CURRENT (A)
-16
-18
Figure 5. LE/HYS Pin Current vs. Voltage
Figure 8. Hysteresis vs. LE/HYS Pin Current
200 150 100
400 350 300
VCC = 2.5V VCC = 5.5V
HYSTERESIS (mV)
CURRENT (A)
250 200 150 100 50 VCC = 2.5V
50 0 -50 -100 -150
-1
0
1
2
3 4 SDN PIN (V)
5
6
7
05917-007
0
50
100 150 200 250 300 350 400 450 500 550 600 650 HYS RESISTOR (k)
Figure 6. SDN Pin Current vs. Voltage
Figure 9. Hysteresis vs. Hysteresis Resistor
10 8 6 4 2
3.5
3.0
PROPAGATION DELAY (ns)
2.5
IB (A)
0 -2 -4 -6 -8 -10 -1.0 -0.5 -40C +25C +125C 0 0.5 1.0 1.5 2.0 VCM AT VCC = 2.5V 2.5 3.0 3.5
05917-006
2.0
1.5
PROPAGATION DELAY FALL
1.0
PROPAGATION DELAY RISE 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 OVERDRIVE (mV)
Figure 7. Input Bias Current vs. Input Common-Mode Voltage
Figure 10. Propagation Delay vs. Input Overdrive
Rev. A | Page 8 of 16
ADCMP606/ADCMP607
1.4 PROPAGATION DELAY FALL ns
5.550V Q
PROPAGATION DELAY (ns)
1.3
1.2 PROPAGATION DELAY RISE ns
05917-010
1.1 -0.2
0.2
0.6
1.0 1.4 1.8 2.2 VCM AT VCC = 2.5V
2.6
3.0
5.050V
1.000ns/DIV
Figure 11. Propagation Delay vs. Input Common-Mode Voltage
Figure 13. Output Waveform at VCC = 5.5 V
2.550V Q
Q
05917-011
2.050V
1.000ns/DIV
Figure 12 .Output Waveform at VCC = 2.5 V
Rev. A | Page 9 of 16
05917-012
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 F 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. 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 k. 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.
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 cable or into transmission lines terminated using either microstrip or strip line techniques with 50 referenced to VCCO. The CML output stage is shown in the simplified schematic diagram in Figure 14. Each output is backterminated with 50 for best transmission line matching.
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.
50
Q Q
16mA
05917-013
GND
Figure 14. Simplified Schematic Diagram of CML-Compatible Output Stage
Rev. A | Page 10 of 16
ADCMP606/ADCMP607
COMPARATOR PROPAGATION DELAY DISPERSION
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). 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
-VH 2
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
VOH
VOL
0
+VH 2
INPUT
Figure 17. Comparator Hysteresis Transfer Function
INPUT VOLTAGE 10mV OVERDRIVE VN VOS
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.
400 350 300
Q/Q OUTPUT
Figure 15. Propagation Delay--Overdrive Dispersion
INPUT VOLTAGE 1V/ns VN VOS 10V/ns
05917-015
HYSTERESIS (mV)
DISPERSION Q/Q OUTPUT
05917-014
DISPERSION
250 200 150 100 50
05917-017
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
VCC = 2.5V
0
50
100 150 200 250 300 350 400 450 500 550 600 650 HYS RESISTOR (k)
Figure 18. Hysteresis vs. RHYS Control Resistor
Rev. A | Page 11 of 16
05917-016
ADCMP606/ADCMP607
The hysteresis control pin appears as a 1.25 V bias voltage seen through a series resistance of 70 k 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. 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.
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.
Rev. A | Page 12 of 16
ADCMP606/ADCMP607 TYPICAL APPLICATION CIRCUITS
2.5V TO 5V 0.1F INPUT 2k
5V
50
50 CML OUTPUT
05917-018
50
50 CML PWM OUTPUT
2k
ADCMP606
ADCMP606
INPUT 2.5V 50mV
0.1F
Figure 19. Self-Biased, 50% Slicer
INPUT 2.5V REF 3.3V 10k 10k
ADCMP601
50 50 10k LVDS 100 150pF LE/HYS
05917-022
ADCMP606
CML OUTPUT
05917-019
100k
Figure 20. LVDS to CML
Figure 23. Oscillator and Pulse-Width Modulator
2.5V TO 5V
5V
50
10k 50 50
50
ADCMP607
82pF
ADCMP607
LE/HYS
CML OUTPUT
DIGITAL INPUT
05917-020
74 VHC 1G07
150k
LE/HYS
10k
CONTROL VOLTAGE 0V TO 2.5V
150k
Figure 21. Current-Controlled Oscillator
Figure 24. Hysteresis Adjustment with Latch
3.3V VCCI 1N4001
+2.5V - 3V VCCI
VCCO 50 50 3.3V PECL
05917-021
VCCO 50 50
LVDS
100
ADCMP607
ADCMP607
OUTPUT
-2.5V VEE
Figure 22. Fake PECL Levels Using a Series Diode
Figure 25. Ground-Referenced CML with 3 V Input Range
Rev. A | Page 13 of 16
05917-024
05917-023
CONTROL CURRENT
10k
ADCMP606/ADCMP607 OUTLINE DIMENSIONS
2.20 2.00 1.80 2.40 2.10 1.80
1.35 1.25 1.15 PIN 1 1.30 BSC 1.00 0.90 0.70
6 1
5 2
4 3
0.65 BSC 1.10 0.80 0.40 0.10 0.46 0.36 0.26
0.10 MAX
0.30 0.15 0.10 COPLANARITY
SEATING PLANE
0.22 0.08
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 0.45 PIN 1 INDICATOR TOP VIEW 2.75 BSC SQ EXPOSED PAD (BOTTOM VIEW) 12 MAX 1.00 0.85 0.80 SEATING PLANE 0.80 MAX 0.65 TYP 0.05 MAX 0.02 NOM 0.30 0.23 0.18 0.20 REF COPLANARITY 0.08 0.50 BSC 0.75 0.55 0.35
0.60 MAX
PIN 1 INDICATOR *1.45 1.30 SQ 1.15
9 8 7
10
11 12
1 2
6
5
4
3
0.25 MIN
*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 x 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 -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
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]
Package Option KS-6 KS-6 KS-6 CP-12-1 CP-12-1 CP-12-1
Branding G0S G0S G0S G0H G0H G0H
Z = RoHS Compliant Part.
Rev. A | Page 14 of 16
ADCMP606/ADCMP607 NOTES
Rev. A | Page 15 of 16
ADCMP606/ADCMP607 NOTES
(c)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

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