AD7890 データシートの表示（PDF） - Analog Devices

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AD7890

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

Analog Devices 

AD7890

Pin No.

14

15

16

17

18

19

20

21

22

23

24

Mnemonic

SHA IN

AGND

VIN1

VIN2

VIN3

VIN4

VIN5

VIN6

VIN7

VIN8

REF OUT/REF IN

Description

Track/Hold Input. The input to the on-chip track/hold is applied to this pin. It is a high impedance input and the

input voltage range is 0 V to 2.5 V.

Analog Ground. Ground reference for track/hold, comparator, and DAC.

Analog Input Channel 1. 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.

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.

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.

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.

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.

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.

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.

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.

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 typically 2 kΩ. When using an external reference source as

the reference voltage for the part, the reference 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.

Rev. C | Page 8 of 28

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