AD7323 Analog Devices, AD7323 Datasheet - Page 22

• Manufacturer Part Number: AD7323
• Description: 500 kSPS, 4-Channel, Software Selectable True bipolar Input, 12-Bit Plus Sign A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7323

• Resolution (bits): 13bit
• # Chan: 4
• Sample Rate: 500kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: Bip 10V,Bip 2.5V,Bip 5.0V,Uni 10V
• Adc Architecture: SAR
• Pkg Type: SOP

AD7323
REGISTERS
The AD7323 has three programmable registers: the control
register, sequence register, and range register. These registers
are write-only registers.
ADDRESSING REGISTERS
A serial transfer on the AD7323 consists of 16 SCLK cycles. The
three MSBs on the DIN line during the 16 SCLK transfer are
decoded to determine which register is addressed. The three
Table 8. Decoding Register Select Bits and Write Bit
Write
0
1
1
1
Register Select 1
0
0
0
1
Register Select 2
0
0
1
1
Description
Data on the DIN line during this serial transfer is ignored.
This combination selects the control register. The subsequent 12 bits are loaded into
the control register.
This combination selects the range register. The subsequent eight bits are loaded into
the range register.
This combination selects the sequence register. The subsequent four bits are loaded
into the sequence register.
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MSBs consist of the write bit, Register Select 1 bit, and Register
Select 2 bit. The register select bits are used to determine which
of the three on-board registers is selected. The write bit
determines if the data on the DIN line following the register
select bits loads into the addressed register. If the write bit is 1,
the bits load into the register addressed by the register select
bits. If the write bit is 0, the data on the DIN line does not load
into any register.