ANALOG DEVICES AD8469 Service Manual

Fast, Rail-to-Rail, Low Power, 2.5 V to 5.5 V,

Single-Supply TTL/CMOS Comparator

AD8469

Rev. 0

rights of third parties that may result from its use. Specifications subject to change without notice. No

Trademarks and registered trademarks are the prop erty of their respective owner s.

VP NONINVERT ING

INPUT

INVERTI NG

INPUT

Q OUTPUT

HYS INPUT

10490-001

AD8469

TTL/CMOS

Data Sheet

FEATURES

Qualified for automotive applications Fully specified rail-to-rail at V Input common-mode voltage: V Low glitch TTL-/CMOS-compatible output stage 40 ns propagation delay Low power: 1.4 mW at 2.5 V Shutdown pin Programmable hysteresis Power supply rejection better than −50 dB

−40°C to +125°C operation

APPLICATIONS

High speed instrumentation Clock and data signal restoration Logic level shifting or translation High speed line receivers Threshold detection Peak and zero-crossing detectors High speed trigger circuitry Pulse-width modulators Current/voltage controlled oscillators

= 2.5 V to 5.5 V

− 0.2 V to VCC + 0.2 V

GENERAL DESCRIPTION

The AD8469 is a fast comparator fabricated on XFCB2, an Analog Devices, Inc., proprietary process. This comparator is exceptionally versatile and easy to use. Features include an input range from V

CMOS-compatible output drivers, adjustable hysteresis control, and a shutdown input. The device offers a 40 ns propagation delay driving a 15 pF load with 10 mV overdrive on 500 µA typical supply current.

A flexible power supply scheme allows the device to operate from a single +2.5 V positive supply with a −0.2 V to +2.7 V input signal range up to a +5.5 V positive supply with a −0.2 V to +5.7 V input signal range.

The TTL-/CMOS-compatible output stage is designed to drive up to 15 pF with full rated timing specifications and to degrade in a graceful and linear fashion as additional capacitance is added. The input stage of the comparator offers robust protection against large input overdrive, and the outputs do not phase reverse when the valid input signal range is exceeded.

The AD8469 is available in an 8-lead MSOP package and features a shutdown pin and hysteresis control. It is fully specified over an operating temperature range of −40°C to +125°C.

FUNCTIONAL BLOCK DIAGRAM

− 0.2 V to VCC + 0.2 V, low noise, TTL- and

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

license is granted by implication or ot herwise under any patent or patent rights of Analog D evices.

Figure 1.

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AD8469 Data Sheet

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Electrical Characteristics ............................................................. 3

Absolute Maximum Ratings ............................................................ 4

Thermal Resistance ...................................................................... 4

ESD Caution .................................................................................. 4

Pin Configuration and Function Descriptions ............................. 5

Typical Performance Characteristics ............................................. 6

REVISION HISTORY

1/12—Revision 0: Initial Version

Applications Information .................................................................8

Power/Ground Layout and Bypassing ........................................8

TTL-/CMOS-Compatible Output Stage ....................................8

Optimizing Performance ..............................................................8

Comparator Propagation Delay Dispersion ................................8

Comparator Hysteresis .................................................................9

Crossover Bias Point .....................................................................9

Minimum Input Slew Rate Requirement ................................ 10

Typical Applications Circuits ........................................................ 11

Outline Dimensions ....................................................................... 12

Ordering Guide .......................................................................... 12

Automotive Products ................................................................. 12

Rev. 0 | Page 2 of 12

Data Sheet AD8469

Input Voltage High

VIH

Comparator is operating

2.0 VCC

Propagation Delay Skew

Positive Supply Current

VCC = 2.5 V

550

650

μA

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

VCC = 2.5 V, TA = −40°C to +125°C, typical values at TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

DC INPUT CHARACTERISTICS

Voltage Range VP, VN VCC = 2.5 V to 5.5 V −0.2 VCC + 0.2 V Common-Mode Range VCM VCC = 2.5 V to 5.5 V −0.2 VCC + 0.2 V Differential Voltage VCC = 2.5 V to 5.5 V VCC V Offset Voltage VOS −5.0 ±3 +5.0 mV Bias Current IP, IN −0.4 +0.4 µA Offset Current −1.0 +1.0 µA Capacitance CP, CN 1 pF Differential Mode Resistance −0.5 V to VCC + 0.5 V 200 7000 kΩ Common-Mode Resistance −0.5 V to VCC + 0.5 V 100 4000 kΩ Active Gain AV 80 dB Common-Mode Rejection Ratio CMRR VCM = −0.2 V to +2.7 V, VCC = 2.5 V 50 dB VCM = −0.2 V to +2.7 V, VCC = 5.5 V 50 dB Hysteresis R

HYSTERESIS MODE AND TIMING

Hysteresis Mode Bias Voltage Current = 1 μA 1.145 1.25 1.35 V Minimum Resistor Value Hysteresis = 120 mV 30 120 kΩ

SHUTDOWN PIN CHARACTERISTICS1

= ∞ 0.1 mV

HYS

Input Voltage Low VIL Shutdown guaranteed −0.2 +0.4 V Input Current High IIH VIH = VCC −6 +6 µA Sleep Time tSD lCC < 100 µA 300 ns Wake-Up Time tH VP = 10 mV, output valid 150 ns

DC OUTPUT CHARACTERISTICS VCC = 2.5 V

Output Voltage High VOH IOH = 0.8 mA VCC − 0.4 V Output Voltage Low VOL IOL = 0.8 mA 0.4 V

AC PERFORMANCE2

Rise Time/Fall Time tR/tF 10% to 90%, VCC = 2.5 V 25 to 50 ns 10% to 90%, VCC = 5.5 V 45 to 75 ns Propagation Delay tPD VOD = 10 mV, VCC = 2.5 V 30 to 50 ns VOD = 50 mV, VCC = 5.5 V 35 to 60 ns

Rising-to-Falling Transition VCC = 2.5 V 4.5 ns

VCC = 5.5 V 8 ns

Q to Q

= 2.5 V 3 ns

VCC = 5.5 V 4 ns Overdrive Dispersion 10 mV < VOD < 125 mV 12 ns Common-Mode Dispersion −0.2 V < VCM < VCC + 0.2 V 1.5 ns

POWER SUPPLY

Supply Voltage Range VCC 2.5 5.5 V

VCC

VCC = 5.5 V 800 1100 μA

Power Dissipation PD VCC = 2.5 V 1.4 1.7 mW VCC = 5.5 V 4.5 7 mW Power Supply Rejection Ratio PSRR VCC = 2.5 V to 5.5 V −50 dB Shutdown Current ISD VCC = 2.5 V to 5.5 V 150 260 μA

The output is high impedance when the device is in shutdown mode. Note that this feature must be used with care because the enable/disable time is much longer

than with a true tristate output.

VIN = 100 mV square input at 1 MHz, VCM = 0 V, CL = 15 pF, VCC = 2.5 V, unless otherwise noted.

Rev. 0 | Page 3 of 12

AD8469 Data Sheet

VCC to Ground

−0.5 V to +6.0 V

Shutdown Pin, SDN

±50 mA

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltages, VCC and VEE

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.

Differential Supply Voltage −6.0 V to +6.0 V

Analog Inputs, VP and VN

Input Voltage −0.5 V to VCC + 0.5 V Differential Input Voltage ±(VCC + 0.5 V) Maximum Input/Output Current ±50 mA

Applied Voltage (SDN to Ground) −0.5 V to VCC + 0.5 V Maximum Input/Output Current ±50 mA

Hysteresis Control Pin, HYS

Applied Voltage (HYS to Ground) −0.5 V to VCC + 0.5 V

Maximum Input/Output Current ±50 mA Output Current, Q and Q Operating Temperature

Ambient Temperature Range −40°C to +125°C

Junction Temperature 150°C

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.

Package Type θ

8-Lead MSOP (RM-8) 130 °C/W

Measurement in still air.

Unit

ESD CAUTION

Rev. 0 | Page 4 of 12

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