AD7922ARMZ Analog Devices Inc, AD7922ARMZ Datasheet - Page 10

• Manufacturer Part Number: AD7922ARMZ
• Description: IC ADC 12BIT 1MSPS DUAL 8-MSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7922ARMZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Operating Temperature: -40°C ~ 85°C
• Number Of Bits: 12
• Sampling Rate (per Second): 1M
• Number Of Converters: 1
• Power Dissipation (max): 20mW
• Voltage Supply Source: Single Supply
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
• Resolution (bits): 12bit
• Input Channel Type: Single Ended
• Supply Voltage Range - Analogue: 2.35V To 5.25V
• Supply Current: 4mA
• No. Of Pins: 8
• Sampling Rate: 1MSPS
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7922CBZ - BOARD EVAL FOR AD7922
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
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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