AD7475BRM-REEL7 查看數據表（PDF） - Analog Devices
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AD7475BRM-REEL7 Datasheet PDF : 24 Pages
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AD7475/AD7495
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
REF IN 1
8 VDD
VIN 2 AD7475 7 CS
TOP VIEW
GND 3 (Not to Scale) 6 VDRIVE
SCLK 4
5 SDATA
Figure 5. AD7475 SOIC/MSOP Pin Configuration
REF OUT 1
8 VDD
VIN 2 AD7495 7 CS
TOP VIEW
GND 3 (Not to Scale) 6 VDRIVE
SCLK 4
5 SDATA
Figure 6. AD7495 SOIC/MSOP Pin Configuration
Table 5. Pin Descriptions
Pin No.
Mnemonic
1 (AD7475) REF IN
1 (AD7495) REF OUT
2
VIN
3
GND
4
SCLK
5
SDATA
6
VDRIVE
7
CS
8
VDD
Function
Reference Input for the AD7475. An external reference must be applied to this input. The voltage range for
the external reference is 2.5 V ± 1% for specified performance. A cap of a least 0.1 μF should be placed on the
REF IN pin.
Reference Output for the AD7495. A minimum 100 nF capacitance is required from this pin to GND. The
internal reference can be taken from this pin, but buffering is required before it is applied elsewhere in a
system.
Analog Input. Single-ended analog input channel. The input range is 0 to REF IN.
Analog Ground. Ground reference point for all circuitry on the AD7475/AD7495. All analog input signals and
any external reference signal should be referred to this GND voltage.
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 AD7475/AD7495 conversion process.
Data Out, Logic Output. The conversion result from the AD7475/AD7495 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 consists of four
leading zeros followed by the 12 bits of conversion data, which is provided MSB first.
Logic Power Supply Input. The voltage supplied at this pin determines the operating voltage for the serial
interface of the AD7475/AD7495.
Chip Select, Active Low Logic Input. This input provides the dual function of initiating conversions on the
AD7475/AD7495 and also frames the serial data transfer.
Power Supply Input. The VDD range for the AD7475/AD7495 is from 2.7 V to 5.25 V.
Rev. B | Page 10 of 24
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