AD8611 Analog Devices, Inc., AD8611 Datasheet

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AD8611

Manufacturer Part Number
AD8611
Description
Ultrafast 4 Ns Single Supply Comparators
Manufacturer
Analog Devices, Inc.
Datasheet

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FEATURES
4 ns propagation delay at 5 V
Single-supply operation: 3 V to 5 V
100 MHz input
Latch function
APPLICATIONS
High speed timing
Clock recovery and clock distribution
Line receivers
Digital communications
Phase detectors
High speed sampling
Read channel detection
PCMCIA cards
Zero-crossing detector
High speed analog-to-digital converter (ADC)
Upgrade for LT1394 and LT1016 designs
GENERAL DESCRIPTION
The AD8611/AD8612 are single and dual 4 ns comparators
with latch function and complementary output. The latch is not
functional if V
Fast 4 ns propagation delay makes the AD8611/AD8612 good
choices for timing circuits and line receivers. Propagation delays
for rising and falling signals are closely matched and tracked over
temperature. This matched delay makes the AD8611/AD8612
good choices for clock recovery because the duty cycle of the
output matches the duty cycle of the input.
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.
CC
is less than 4.3 V.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The AD8611 has the same pinout as the LT1016 and LT1394,
with lower supply current and a wider common-mode input
range, which includes the negative supply rail.
The AD8611/AD8612 are specified over the industrial temper-
ature range (−40°C to +85°C). The AD8611 is available in both
8-lead MSOP and narrow 8-lead SOIC surface-mount packages.
The AD8612 is available in a 14-lead TSSOP surface-mount
package.
Single-Supply Comparators
INA–
INA+
GND
Figure 1. 8-Lead Narrow Body SOIC
IN+
LEA
PIN CONFIGURATIONS
IN–
IN+
IN–
V+
V–
QA
QA
V+
V–
V–
1
2
3
4
1
2
3
4
Figure 3. 14-Lead TSSOP
1
2
3
4
5
6
7
Figure 2. 8-Lead MSOP
©2006 Analog Devices, Inc. All rights reserved.
(Not to Scale)
(Not to Scale)
AD8611
TOP VIEW
AD8611
TOP VIEW
(Not to Scale)
AD8612
TOP VIEW
(RU-14)
AD8611/AD8612
(RM-8)
(R-8)
Ultrafast, 4 ns
8
7
6
5
8
7
6
5
14
13
12
11
10
QA
QA
GND
LATCH
9
8
QA
QA
GND
LATCH
QB
GND
LEB
V+
INB–
INB+
www.analog.com

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AD8611 Summary of contents

Page 1

... The AD8611/AD8612 are specified over the industrial temper- ature range (−40°C to +85°C). The AD8611 is available in both 8-lead MSOP and narrow 8-lead SOIC surface-mount packages. The AD8612 is available in a 14-lead TSSOP surface-mount package ...

Page 2

... AD8611/AD8612 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 Thermal Resistance ...................................................................... 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Typical Performance Characteristics ............................................. 7 Applications..................................................................................... 10 REVISION HISTORY 8/06—Rev Rev. A Updated Format..................................................................Universal Added No Latch if V < 4.3 V .........................................Universal CC Changes to Pin Names ...

Page 3

... T ≤ +85° ∞ GND O L −40°C ≤ T ≤ +85°C A I− −40°C ≤ T ≤ +85°C A Rev Page AD8611/AD8612 Min Typ Max Unit μV/°C –6 –4 μA –7 –4.5 μA ± ...

Page 4

... AD8611/AD8612 V+ = 3.0 V, V− = VGND = 25°C, unless otherwise noted. A Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Common-Mode Voltage Range Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS Output High Voltage Output Low Voltage LATCH ENABLE INPUT POWER SUPPLY Power Supply Rejection Ratio ...

Page 5

... SOIC (R) 300°C 8-Lead MSOP (RM) 14-Lead TSSOP (RU) 1 θ is specified for the worst-case conditions, that is, a device in socket for JA P-DIP and a device soldered in circuit board for SOIC and TSSOP. Rev Page AD8611/AD8612 θ 1 θ Unit JA JC 158 43 °C/W 240 43 ° ...

Page 6

... LEA 11 LEB 7 INA+ 6 INA− 8 INB+ 9 INB− AD8611 IN TOP VIEW IN– GND 3 6 (Not to Scale) V– LATCH 4 5 Figure 5. 8-Lead MSOP Pin Configuration Description Positive Supply Terminal. Noninverting Analog Input of the Differential Input Stage. ...

Page 7

... CAPACITANCE (pF) Figure 9. Propagation Delay vs. Load Capacitance 50 75 100 25° PD Rev Page AD8611/AD8612 25°C A OVERDRIVE = 5mV 14 PD– 0.5 1.0 1.5 SOURCE RESISTANCE (kΩ) Figure 10. Propagation Delay vs. Source Resistance 25°C ...

Page 8

... AD8611/AD8612 1 1.0 0 0.6 0.4 0.2 0 –60 –40 – TEMPERATURE (°C) Figure 13. Offset Voltage vs. Temperature 25° INPUT FREQUENCY (MHz) Figure 14. Supply Current vs. Input Frequency 2 1.8 1.6 1.4 1.2 1.0 0.8 SETUP TIME 0.6 0.4 HOLD TIME 0.2 0 –50 – TEMPERATURE (°C) Figure 15. Latch Setup and Hold Time vs. Temperature ...

Page 9

... TRACE @ 1V/DIV OUT TIME (2ns/DIV) Figure 21. Rising Edge Response 0V 100 100 Figure 23. Response MHz, 100 mV Input Sine Wave V OUT V IN Rev Page AD8611/AD8612 25° OUT –V TRACE @ 10mV/DIV IN V TRACE @ 1V/DIV OUT TIME (2ns/DIV) Figure 22 ...

Page 10

... Note that signals much greater than 3.0 V result in increased input currents and may cause the comparator to operate more slowly. The input bias current to the AD8611 is 7 μA maximum over temperature (−40°C to +85°C). This is identical to the maximum input bias current for the LT1394, and half of the maximum I for the LT1016 ...

Page 11

... When the latch voltage goes high, the output voltage remains in its previous state, independent of changes in the input voltage. The setup time for the AD8611/AD8612 is 0.5 ns and the hold time is 0.5 ns. Setup time is defined as the minimum amount of time the input voltage must remain in a valid state before the latch is activated for the latch to function properly ...

Page 12

... OUT IN 65 MHz, 100 mV peak-to-peak distorted clock signal into peak-to-peak square wave. The lower trace is the input to the AD8611, and the upper trace is the output from the comparator. The AD8611 is powered from single supply. V OUT 2V/DIV ...

Page 13

... SPICE Model * AD8611 SPICE Macro-Model Typical Values * 1/2000, Ver. 1.0 * TAM/ADSC * * Node assignments * non-inverting input * | inverting input * | | * | | * | | * | | * | | * | | * | | .SUBCKT AD8611 INPUT STAGE * * IBIAS 99 5 RC1 4 50 RC2 6 50 CL1 4 6 CIN 1 2 VCM1 EOS Reference Voltages ...

Page 14

... AD8611/AD8612 * CMRR = 66dB, ZERO AT 1 kHz * ECM1 30 98 RCM1 30 31 RCM2 31 98 CCM1 Latch Section * Power Supply Section * GSY1 99 52 GSY2 52 50 RSY Gain Stage Av = 250 fp=100 MHz * G2 98 ...

Page 15

... CB4 62 51 RO3 RO4 67 65 EO3 63 51 EO4 MODELS * .MODEL PIX PNP(BF=100,IS=1E-16) .MODEL NOX NPN(BF=100,VAF=130,IS=1E-14) .MODEL DX D(IS=1E-14) .MODEL SLATCH1 VSWITCH(ROFF=1E6,RON=500, +VOFF=2.1,VON=1.4) .ENDS AD8611 46 NOX 51 NOX 2000 2000 0.5E-12 1E- 500 (20,51) 1 (20,51 NOX 51 NOX 2000 2000 0 5E-12 1E- 500 ...

Page 16

... AD8611/AD8612 OUTLINE DIMENSIONS 3.20 3.00 2.80 5. 3.20 4.90 3.00 4.65 2. PIN 1 0.65 BSC 0.95 0.85 1.10 MAX 0.75 0.15 0.38 0.23 0.00 0.22 0.08 SEATING COPLANARITY 0.10 PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 27. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 1.05 1.00 0.80 0.25 (0.0098) 0.10 (0.0040) 0.80 COPLANARITY 8° 0.60 0° 0.40 CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN ...

Page 17

... AD8611ARMZ-R2 –40°C to +85°C AD8611AR –40°C to +85°C AD8611AR-REEL –40°C to +85°C AD8611AR-REEL7 –40°C to +85°C 1 AD8611ARZ –40°C to +85°C AD8611ARZ-REEL 1 –40°C to +85°C 1 AD8611ARZ-REEL7 –40°C to +85°C AD8612ARU –40°C to +85°C AD8612ARU-REEL – ...

Page 18

... AD8611/AD8612 NOTES Rev Page ...

Page 19

... NOTES Rev Page AD8611/AD8612 ...

Page 20

... AD8611/AD8612 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C06010-0-8/06(A) Rev Page ...

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