AD7824 datasheet, PDF - EEWORLD Datasheet

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AD7824: Description4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24; Categorysemiconductor logic; File Size242KB，16 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD7824 Overview

4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24

AD7824 Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	24
Maximum operating temperature	125 Cel
Minimum operating temperature	-55 Cel
Rated supply voltage	5 V
Maximum conversion time	2.8 uS
Maximum linear error	0.1953 %
Maximum limit analog input voltage	5 V
Minimum limit analog input voltage	0.0 V
Processing package description	HERMETIC SEALED, CERDIP-24
state	ACTIVE
Craftsmanship	CMOS
packaging shape	Rectangle
Package Size	IN-line
Terminal form	THROUGH-hole
Terminal spacing	2.54 mm
terminal coating	tin lead
Terminal location	pair
Packaging Materials	Ceramic, Glass-SEALED
Temperature level	MILITARY
Sampling Rate	0.1000 MHz
Output format	Parallel, 8-bit
Type of converter	flash method
Number of digits	8
Output bit encoding	BINARY, COMPLEMENTARY OFFSET BINARY
Number of analog channels	4
Sample and hold and track and hold	TRACK

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FEATURES

4 or 8 Analog Input Channels

Built-In Track-and-Hold Function

10 kHz Signal Handling on Each Channel

Fast Microprocessor Interface

Single 5 V Supply

Low Power: 50 mW

Fast Conversion Rate: 2.5 s/Channel

Tight Error Specification: 1/2 LSB

LC MOS High Speed

4- and 8-Channel 8-Bit ADCs

AD7824/AD7828

FUNCTIONAL BLOCK DIAGRAM

REF

(+)

REF

(–)

AIN1

AIN4

4-BIT

FLASH

ADC

(4MSB)

4-BIT

DAC

REF

(+)

4-BIT

FLASH

ADC

(4LSB)

TIMING AND CONTROL

CIRCUITRY

RDY

THREE-

STATE

DRIVERS

DB3

DB2

DB1

DB0

INT

DB7

DB6

DB5

DB4

MUX*

AIN8

ADDRESS

LATCH

DECODE

A0 A1 A2**

*AD7824

– 4-CHANNEL MUX

**AD7828

– 8-CHANNEL MUX

A2 – AD7828 ONLY

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The AD7824 and AD7828 are high speed, multichannel, 8-bit

ADCs with a choice of four (AD7824) or eight (AD7828) multi-

plexed analog inputs. A half-flash conversion technique gives a fast

conversion rate of 2.5

µs

per channel, and the parts have a built-in

track-and-hold function capable of digitizing full-scale signals of

10 kHz (157 mV/µs slew rate) on all channels. The AD7824 and

AD7828 operate from a single 5 V supply and have an analog input

range of 0 V to 5 V, using an external 5 V reference.

Microprocessor interfacing of the parts is simple, using standard

Chip Select (CS) and Read (RD) signals to initiate the conversion

and read the data from the three-state data outputs. The half-flash

conversion technique means that there is no need to generate a

clock signal for the ADC. The AD7824 and AD7828 can be

interfaced easily to most popular microprocessors.

The AD7824 and AD7828 are fabricated in an advanced, all

ion-implanted, linear compatible CMOS process (LC

MOS) and

have low power dissipation of 40 mW (typ). The AD7824 is

available in a 0.3" wide, 24-lead “skinny” DIP, while the AD7828

is available in a 0.6" wide, 28-lead DIP and in 28-terminal surface-

mount packages.

1. 4- or 8-channel input multiplexer gives cost effective,

space-saving multichannel ADC system.

2. Fast conversion rate of 2.5

µs/channel

features a per-channel

sampling frequency of 100 kHz for the AD7824 or 50 kHz

for the AD7828.

3. Built-in track-and-hold function allows handling of four or

eight channels up to 10 kHz bandwidth (157 mV/µs slew rate).

4. Tight total unadjusted error spec and channel-to-channel

matching eliminate the need for user trims.

5. Single 5 V supply simplifies system power requirements.

6. Fast, easy-to-use digital interface allows connection to most

popular microprocessors with minimal external components.

No clock signal is required for the ADC.

REV. F

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. 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 companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

AD7824 Related Products

	AD7824	AD7828TE/883B	AD7828UE/883B	AD7828UQ/883B	AD7828	AD7828UE
Description	4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24	4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24	4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24	8-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP28	4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24	4-CH 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, CDIP24
Number of functions	1	1	1	1	1	1
Number of terminals	24	24	24	28	24	24
Maximum operating temperature	125 Cel	125 Cel	125 Cel	125 Cel	125 Cel	125 Cel
Minimum operating temperature	-55 Cel	-55 Cel	-55 Cel	-55 Cel	-55 Cel	-55 Cel
Rated supply voltage	5 V	5 V	5 V	5 V	5 V	5 V
Maximum conversion time	2.8 uS	2.8 uS	2.8 uS	2.8 uS	2.8 uS	2.8 uS
Maximum linear error	0.1953 %	0.1953 %	0.1953 %	0.1953 %	0.1953 %	0.1953 %
Maximum limit analog input voltage	5 V	5 V	5 V	5 V	5 V	5 V
Minimum limit analog input voltage	0.0 V	0.0 V	0.0 V	0.0 V	0.0 V	0.0 V
Processing package description	HERMETIC SEALED, CERDIP-24	HERMETIC SEALED, CERDIP-24	HERMETIC SEALED, CERDIP-24	HERMETIC SEALED, CERDIP-28	HERMETIC SEALED, CERDIP-24	HERMETIC SEALED, CERDIP-24
state	ACTIVE	ACTIVE	ACTIVE	EOL/LIFEBUY	ACTIVE	ACTIVE
Craftsmanship	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
packaging shape	Rectangle	Rectangle	Rectangle	Rectangle	Rectangle	Rectangle
Package Size	IN-line	IN-line	IN-line	IN-line	IN-line	IN-line
Terminal form	THROUGH-hole	THROUGH-hole	THROUGH-hole	THROUGH-hole	THROUGH-hole	THROUGH-hole
Terminal spacing	2.54 mm	2.54 mm	2.54 mm	2.54 mm	2.54 mm	2.54 mm
terminal coating	tin lead	tin lead	tin lead	tin lead	tin lead	tin lead
Terminal location	pair	pair	pair	pair	pair	pair
Packaging Materials	Ceramic, Glass-SEALED	Ceramic, Glass-SEALED	Ceramic, Glass-SEALED	Ceramic, Glass-SEALED	Ceramic, Glass-SEALED	Ceramic, Glass-SEALED
Temperature level	MILITARY	MILITARY	MILITARY	MILITARY	MILITARY	MILITARY
Sampling Rate	0.1000 MHz	0.1000 MHz	0.1000 MHz	0.0500 MHz	0.1000 MHz	0.1000 MHz
Output format	Parallel, 8-bit	Parallel, 8-bit	Parallel, 8-bit	Parallel, 8-bit	Parallel, 8-bit	Parallel, 8-bit
Type of converter	flash method	flash method	flash method	flash method	flash method	flash method
Number of digits	8	8	8	8	8	8
Output bit encoding	BINARY, COMPLEMENTARY OFFSET BINARY	BINARY, COMPLEMENTARY OFFSET BINARY	BINARY, COMPLEMENTARY OFFSET BINARY	BINARY, COMPLEMENTARY OFFSET BINARY	BINARY, COMPLEMENTARY OFFSET BINARY	BINARY, COMPLEMENTARY OFFSET BINARY
Number of analog channels	4	4	4	8	4	4
Sample and hold and track and hold	TRACK	TRACK	TRACK	TRACK	TRACK	TRACK

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