AD7732 Analog Devices, AD7732 Datasheet - Page 16

• Manufacturer Part Number: AD7732
• Manufacturer: Analog Devices

Specifications of AD7732

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: 3.05MSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip 10V,Bip 5.0V,Uni 10V,Uni 5.0V
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

AD7732
I/O Port Register
8 Bits, Read/Write Register, Address 01h, Default Value 30h + Digital Input Value × 40h
The bits in this register are used to configure and access the digital I/O port on the AD7732.
Bit
Mnemonic
Default
Bit
7, 6
5, 4
3
2, 1
0
Revision Register
8 Bits, Read-Only Register, Address 02h, Default Value 04h + Chip Revision × 10h
Bit
Mnemonic
Default
Bit
7–4
3–0
Test Register
24 Bits, Read/Write Register, Address 03h
This register is used for testing the part in the manufacturing process. The user must not change the default configuration of this register.
Mnemonic
P0, P1
P0 DIR, P1 DIR
RDYFN
0
SYNC
Mnemonic
Chip Revision Code
Chip Generic Code
Bit 7
P0
P0 Pin
Description
When the P0 and P1 pins are configured as outputs, the P0 and P1 bits determine the pins’ output level. When
the P0 and P1 pins are configured as inputs, the P0 and P1 bits reflect the current input level on the pins.
These bits determine whether the P0 and P1 pins are configured as inputs or outputs. When set to 1, the
corresponding pin will be an input; when reset to 0, the corresponding pin will be an output.
This bit is used to control the function of the RDY pin on the AD7732. When this bit is reset to 0, the RDY pin
goes low when any channel has unread data. When this bit is set to 1, the RDY pin will only go low if all
enabled channels have unread data.
These bits must be 0 for proper operation.
This bit enables the SYNC pin function. By default, this bit is 0 and SYNC/P1 can be used as a digital I/O pin.
When the SYNC bit is set to 1, the SYNC pin can be used to synchronize the AD7732 modulator and digital
filter with other devices in the system.
Bit 7
x
Description
4-Bit Factory Chip Revision Code
On the AD7732, these bits will read back as 04h.
Bit 6
x
Bit 6
P1
P1 Pin
Chip Revision Code
Bit 5
x
Bit 5
P0 DIR
1
Rev. A | Page 16 of 32
Bit 4
x
Bit 4
P1 DIR
1
Bit 3
RDYFN
0
Bit 3
0
Bit 2
0
0
Bit 2
1
Chip Generic Code
Bit 1
0
0
Bit 1
0
Bit 0
SYNC
0
Bit 0
0