AD7874SE3 datasheet(4/16 Pages) AD

Nome de Peças	AD7874SE3

Descrição Electrónicos	LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System

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Fabricante Electrônico	AD [Analog Devices]

Página de início	http://www.analog.com

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AD7874

REV. C

–4–

TERMINOLOGY

ACQUISITION TIME

Acquisition Time is the time required for the output of the

track/hold amplifiers to reach their final values, within

±1/2

LSB, after the falling edge of INT (the point at which the track/

holds return to track mode). This includes switch delay time,

slewing time and settling time for a full-scale voltage change.

APERTURE DELAY

Aperture Delay is defined as the time required by the internal

switches to disconnect the hold capacitors from the inputs. This

produces an effective delay in sample timing. It is measured by

applying a step input and adjusting the CONVST input position

until the output code follows the step input change.

APERTURE DELAY MATCHING

Aperture Delay Matching is the maximum deviation in aperture

delays across the four on-chip track/hold amplifiers.

APERTURE JITTER

Aperture Jitter is the uncertainty in aperture delay caused by

internal noise and variation of switching thresholds with signal

level.

DROOP RATE

Droop Rate is the change in the held analog voltage resulting

from leakage currents.

CHANNEL-TO-CHANNEL ISOLATION

Channel-to-Channel Isolation is a measure of the level of

crosstalk between channels. It is measured by applying a full-

scale 1 kHz signal to the other three inputs. The figure given is

the worst case across all four channels.

SNR, THD, IMD

See DYNAMIC SPECIFICATIONS section.

PIN CONFIGURATIONS

DIP and SOIC

V

IN1

V

IN2

V

IN4

V

IN3

REF IN

AGND

DB0 (LSB)

V

DD

V

SS

REF OUT

CLK

DB1

V

DD

DB2

DB11 (MSB)

DB3

DB10

DB4

DB9

DB5

DB8

DB6

DGND

DB7

13

18

1

2

28

27

5

6

7

24

23

22

3

4

26

25

821

920

10

19

11

12

17

16

14

15

TOP VIEW

(Not to Scale)

AD7874

INT

CONVST

RD

CS

LCCC

V

DD

CLK

REF OUT

REF IN

DB1

AGND

DB0 (LSB)

DB10

DB11 (MSB)

DB3

DB2

AD7874

27

1

28

226

3

4

25

22

24

23

21

19

20

18

17

12 13

16

14 15

11

10

9

8

7

6

5

TOP VIEW

(Not to Scale)

CONVST

RD

CS

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Analog Devices	AD7874SE3	326Kb / 16P	LC2MOS 4-Channel, 12-Bit Simultaneous Sampling Data Acquisition System REV. C

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