AD7708 Analog Devices, AD7708 Datasheet - Page 23

• Manufacturer Part Number: AD7708
• Description: 16-Bit 8/10-Channel, Low Voltage, Low Power, Sigma Delta ADC
• Manufacturer: Analog Devices

Specifications of AD7708

• Resolution (bits): 16bit
• # Chan: 10
• Sample Rate: n/a
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref/PGA Gain) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOIC,SOP

Register Name
Communications
Status Register
Mode Register
Control Register
I/O Control Register Read/Write
Filter Register
AD7718 ADC (DATA)
Data Register
AD7708 (DATA)
Data Register
CHOP NEGBUF REFSEL CHCON OSCPD
MSB
M
WEN
M
M
R
M
CR7
S
C
D
F
0
S
S
S
H
S
7
Y
B
B
B
B
3
C
S
CR6
R/W
0
0
F
H
6
2
P
C
2
C
CR5
S
0(0)
D
A
H
F
Type
Write Only
Read Only
Read/Write
Read/Write
Read/Write
Read Only
Read Only
L
I
5
1
R
P
S
CR4
0(0)
C
1
F
D
0
H
4
I
0
R
Size
8 Bits
8 Bits
8 Bits
8 Bits
8 Bits
8 Bits
24 Bits
16 Bits
A3(0)
CR3
S
E
U B
F
0
R
/
3
R
Table XI. Registers—Quick Reference Guide
A2(0)
CR2
S
R
0
F
0
MD2
N
2
2
P
A1(0)
2
CR1
Not Applicable
S
Power-On/Reset
Default Value
00 Hex
00 Hex
07 Hex
00 Hex
D
45 Hex
000000 Hex
0000 Hex
R
MD1
F
0
A
N
1
1
T
P
L
A0(0)
CR0
L
L
L
1
S
L
R
O
LSB
MD0
D
S
S
S
F
S
N
C
B
B
B
A
0
B
0
K
T
All operations to other registers are initiated through
Controls functions such as mode of operation, chan-
Function
the Communications Register. This controls whether
subsequent operations are read or write operations
and also selects the register for that subsequent
operation.
Provides status information on conversions, calibra-
tions and error conditions.
nel configuration, oscillator operation in power-down.
ADC (ADCCON)
This register is used to select the active channel
input, configure the operating input range, and select
unipolar or bipolar operation.
I/O (IOCON)
This register is used to control and configure the
I/O port.
This register determines the amount of averaging
performed by the sinc filter and consequently deter-
mines the data update rate of the AD7708/AD7718.
The filter register determines the update rate for
operation with CHOP enabled and CHOP disabled.
Provides the most up-to-date conversion result for
the selected channel on the AD7718.
Provides the most up-to-date conversion result for
the selected channel on the AD7708.
AD7708/AD7718