AD7874 datasheet(17/17 Pages) AD

17 / 17 page

AD7874

REV. C

–16–

SHORTING PLUG OPTIONS

There are seven shorting plug options which must be set before

using the board. These are outlined below:

LK1–LK4

Connects the analog inputs to the buffer amplifi-

ers. The analog inputs may also be connected to a

component grid for signal conditioning.

LK5

Selects either the AD7874 internal clock or an ex-

ternal clock source.

LK6

Selects either the AD7874 internal reference or an

external reference source.

LK7

Connects the AD7874 RD input directly to the

input of SKT8 or to a decoded STRB and

R/W input. This shorting plug setting depends on

the microprocessor, e.g., the TMS32020 and

68000 require a decoded RD signal.

COMPONENT LIST

IC1

AD713 Quad Op Amp

IC2

AD7874 Analog-to-Digital Converter

IC3

MC78L05 +5 V Regulator

IC4

MC79L05 –5 V Regulator

IC5

74HC00 Quad NAND Gate

C1, C3, C5, C7, C9

µF Capacitors

C2, C4, C6, C8, C10

0.1

µF Capacitors

R1, R2

10 k

Ω Pull-Up Resistors

LK1, LK2, LK3

Shorting Plugs

LK4, LK5, LK6

LK7

SKT1, SKT2, SKT3,

BNC Sockets

SKT4, SKT5, SKT6,

SKT7

SKT8

26-Contact (2-Row) IDC Connector

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

Plastic (N-28)

Cerdip (Q-28)

SOIC (R-28)

LCCC (E-28A)

0.458 (11.63) 2

0.442 (11.23)

BOTTOM VIEW

NO. 1 PIN INDEX

0.055 (1.40)

0.045 (1.14)

0.028 (0.71)

0.022 (0.56)

0.050

± 0.005

(1.27

± 0.13)

0.040 x 45

(1.02 x 45

°)

REF 3 PLCS

0.020 x 45

(0.51 x 45

°) REF

0.100 (2.54)

0.064 (1.63)

NOTES

1. THIS DIMENSION CONTROLS THE OVERALL PACKAGE

THICKNESS.

2. APPLIES TO ALL FOUR SIDES.

3. ALL TERMINALS ARE GOLD PLATED.

0.075

(1.91)

REF

AD7874 Datasheet(PDF) 17 Page - Analog Devices

AD7874 Datasheet(HTML) 17 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Datasheet Download

Link URL