AD7912 Analog Devices, AD7912 Datasheet - Page 10
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AD7912
Manufacturer Part Number
AD7912
Description
2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-Bit A/D Converter
Manufacturer
Analog Devices
Datasheet
1.AD7912.pdf
(32 pages)
Specifications of AD7912
Resolution (bits)
10bit
# Chan
2
Sample Rate
1MSPS
Interface
Ser,SPI
Analog Input Type
SE-Uni
Ain Range
Uni Vdd
Adc Architecture
SAR
Pkg Type
SOP,SOT
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AD7912/AD7922
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Table 5. Pin Function Descriptions
MSOP
Pin No.
1
2
3
4
6, 5
7
8
TSOT
Pin No.
4
3
2
1
7, 8
6
5
Figure 8. 8-Lead MSOP Pin Configuration
DOUT
SCLK
DIN
CS
Mnemonic
DOUT
CS
SCLK
DIN
V
GND
V
1
2
3
4
IN0
DD
8-LEAD MSOP
, V
(Not to Scale)
AD7912/
AD7922
TOP VIEW
IN1
Function
Data Out. Logic output. The conversion result from the AD7912/AD7922 is provided on this output as
a serial data stream. The bits are clocked out on the falling edge of the SCLK signal.
For the AD7922, the data stream consists of two leading zeros, the channel identifier bit that identifies
which channel the conversion result corresponds to, followed by the mode bit that indicates the
current mode of operation, followed by the 12 bits of conversion data with MSB first.
For the AD7912, the data stream consists of two leading zeros, the channel identifier bit that identifies
which channel the conversion result corresponds to, followed by the mode bit that indicates the
current mode of operation, followed by the 10 bits of conversion data with MSB first and two trailing
zeros.
Chip Select. Active low logic input. This input provides the dual function of initiating conversions on
the AD7912/AD7922 and framing the serial data transfer.
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 AD7912/AD7922’s conversion process.
Data In. Logic input. The channel to be converted is provided on this input and is clocked into an
internal register on the falling edge of SCLK.
Analog Inputs. These two single-ended analog input channels are multiplexed into the on-chip
track-and-hold amplifier. The analog input channel to be converted is selected by writing to the third
MSB on the DIN pin. The input range is 0 to V
Analog Ground. Ground reference point for all circuitry on the AD7912/AD7922. All analog input
signals should be referred to this GND voltage.
Power Supply Input. The V
8
7
6
5
V
GND
V
V
DD
IN0
IN1
Rev. 0 | Page 10 of 32
DD
range for the AD7912/AD7922 is from 2.35 V to 5.25 V.
DD
.
Figure 9. 8-Lead TSOT Pin Configuration
DOUT
SCLK
DIN
CS
1
2
3
4
8-LEAD TSOT
(Not to Scale)
AD7912/
AD7922
TOP VIEW
8
7
6
5
V
V
GND
V
IN1
IN0
DD