AD7890AR-4 Analog Devices Inc, AD7890AR-4 Datasheet - Page 8

• Manufacturer Part Number: AD7890AR-4
• Description: IC,Data Acquisition System,8-CHANNEL,12-BIT,SOP,24PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Type: Data Acquisition System (DAS)r

Specifications of AD7890AR-4

• Rohs Status: RoHS non-compliant
• Resolution (bits): 12 b
• Sampling Rate (per Second): 117k
• Data Interface: Serial
• Voltage Supply Source: Single Supply
• Voltage - Supply: 0 V ~ 4.10 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)

AD7890
Pin No.
14
15
16
17
18
19
20
21
22
23
24
Mnemonic
SHA IN
AGND
V
V
V
V
V
V
V
V
REF OUT/REF IN
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
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.
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