參數(shù)資料
型號(hào): AD7890AR-4
廠商: Analog Devices Inc
文件頁數(shù): 27/28頁
文件大?。?/td> 0K
描述: IC DAS 12BIT 8CH 24-SOIC
標(biāo)準(zhǔn)包裝: 31
類型: 數(shù)據(jù)采集系統(tǒng)(DAS)
分辨率(位): 12 b
采樣率(每秒): 117k
數(shù)據(jù)接口: 串行
電壓電源: 單電源
電源電壓: 5V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 24-SOIC W
包裝: 管件
AD7890
Rev. C | Page 8 of 28
Pin No.
Mnemonic
Description
14
SHA IN
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.
15
AGND
Analog Ground. Ground reference for track/hold, comparator, and DAC.
16
VIN1
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.
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 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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