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AD7457 数据表(PDF) 7 Page - Analog Devices

部件名 AD7457
功能描述  Low Power, Pseudo Differential, 100 kSPS
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7457 数据表(HTML) 7 Page - Analog Devices

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AD7457
Rev. A | Page 7 of 20
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AD7457
TOP VIEW
(Not to Scale)
VDD 1
SCLK
2
SDATA
3
CS
4
VREF
VIN+
VIN–
GND
8
7
6
5
Figure 4. 8-Lead SOT-23 Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
VDD
Power Supply Input. VDD is 2.7 V to 5.25 V. This supply should be decoupled to GND with a 0.1 µF capacitor and a
10 µF tantalum capacitor.
2
SCLK
Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock input is also
used as the clock source for the conversion process.
3
SDATA
Serial Data. Logic output. The conversion result from the AD7457 is provided on this output as a serial data
stream. The bits are clocked out on the falling edge of the SCLK input. The data stream of the AD7457 consists of
four leading zeros followed by the 12 bits of conversion data that are provided MSB first. The output coding is
straight (natural) binary.
4
CS
Chip Select. This input provides the dual function of powering up the device and initiating a conversion on the
AD7457.
5
GND
Analog Ground. Ground reference point for all circuitry on the AD7457. All analog input signals and any external
reference signal should be referred to this GND voltage.
6
VIN–
Inverting Input. This pin sets the ground reference point for the VIN+ input. Connect to ground or to a dc offset to
provide a pseudo ground.
7
VIN+
Noninverting Analog Input.
8
VREF
Reference Input for the AD7457. An external reference in the range 100 mV to VDD must be applied to this input.
The specified reference input is 2.5 V. This pin should be decoupled to GND with a capacitor of at least 0.33 µF.


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