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AD7890
(Rev.:RevA)

LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System

Analog Devices 

AD7890

Pin

Mnemonic

Description

17

VIN2

Analog Input Channel 2. Single-ended analog input. The analog input range on is ± 10 V (AD7890-

10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The channel to be converted is

selected using the A0, A1 and A2 bits in the control register. The multiplexer has guaranteed

break-before-make operation.

18

VIN3

Analog Input Channel 3. Single-ended analog input. The analog input range on is ± 10 V (AD7890-

10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The channel to be converted is

selected using the A0, A1 and A2 bits in the control register. The multiplexer has guaranteed

break-before-make operation.

19

VIN4

Analog Input Channel 4. Single-ended analog input. The analog input range on is ± 10 V (AD7890-

10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The channel to be converted is

selected using the A0, A1 and A2 bits in the control register. The multiplexer has guaranteed

break-before-make operation.

20

VIN5

Analog Input Channel 5. Single-ended analog input. The analog input range on is ± 10 V (AD7890-

10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The channel to be converted is

selected using the A0, A1 and A2 bits in the control register. The multiplexer has guaranteed

break-before-make operation.

21

VIN6

Analog Input Channel 6. Single-ended analog input. The analog input range on is ± 10 V (AD7890-

10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The channel to be converted is

selected using the A0, A1 and A2 bits in the control register. The multiplexer has guaranteed

break-before-make operation.

22

VIN7

Analog Input Channel 7. Single-ended analog input. The analog input range on is ± 10 V (AD7890-

10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The channel to be converted is

selected using the A0, A1 and A2 bits in the control register. The multiplexer has guaranteed

break-before-make operation.

23

VIN8

Analog Input Channel 8. Single-ended analog input. The analog input range on is ± 10 V (AD7890-

10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The channel to be converted is

selected using the A0, A1 and A2 bits in the control register. The multiplexer has guaranteed

break-before-make operation.

24

REF OUT/REF IN Voltage Reference Output/Input. The part can be used with either its own internal reference or with

an external reference source. The on-chip +2.5 V reference voltage is provided at this pin. When

using this internal reference as the reference source for the part, REF OUT should decoupled to

AGND with a 0.1 µF disc ceramic capacitor. The output impedance of this reference source is typi-

cally 2 kΩ. When using an external reference source as the reference voltage for the part, the refer-

ence source should be connected to this pin. This overdrives the internal reference and provides the

reference source for the part. The REF IN input is buffered on-chip. The nominal reference voltage

for correct operation of the AD7890 is +2.5 V.

PIN CONFIGURATION

DIP and SOIC

AGND 1

24 REF OUT/REF IN

SMODE 2

23 VIN8

DGND 3

22 VIN7

CEXT 4

21 VIN6

CONVST 5

20 VIN5

CLK IN 6 AD7890 19 VIN4

TOP VIEW

SCLK 7 (Not to Scale) 18 VIN3

TFS 8

17 VIN2

RFS 9

16 VIN1

DATA OUT 10

15 AGND

DATA IN 11

14 SHA IN

VDD 12

13 MUX OUT

–6–

REV. A

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