AD7148 Analog Devices, AD7148 Datasheet - Page 30

• Manufacturer Part Number: AD7148
• Manufacturer: Analog Devices

Specifications of AD7148

• Resolution (bits): 16bit
• # Chan: 8
• Sample Rate: 250kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: ± 8 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: CSP

AD7148
V
The supply voltage to all pins associated with the I
interface (SCLK, SDA) is separate from the main V
and is connected to the V
WRITE
READ (USING REPEATED START)
S
READ (WRITE TRANSACTION SETS UP REGISTER ADDRESS)
S
DRIVE
S
6-BIT DEVICE
6-BIT DEVICE
6-BIT DEVICE
ADDRESS
ADDRESS
ADDRESS
OUTPUT FROM MASTER
OUTPUT FROM AD7142
INPUT
W
W
W
REGISTER ADDR
REGISTER ADDR
REGISTER ADDR
HIGH BYTE
HIGH BYTE
[15:8]
DRIVE
S = START BIT
P = STOP BIT
SR = REPEATED START BIT
pin.
REGISTER ADDR
REGISTER ADDR
REGISTER ADDR
LOW BYTE
LOW BYTE
[7:0]
Figure 40. Example of Sequential I
HIGH BYTE [15:8]
ACK = ACKNOWLEDGE BIT
ACK = NO ACKNOWLEDGE BIT
P
2
WRITE DATA
6-BIT DEVICE
C serial
CC
ADDRESS
supplies
S
6-BIT DEVICE
ADDRESS
Rev. A | Page 30 of 56
LOW BYTE [7:0]
HIGH BYTE [15:8]
WRITE DATA
READ DATA
2
C Write and Readback Operation
HIGH BYTE [15:8]
READ DATA
This arrangement allows the AD7148 to be connected directly
to processors whose supply voltage is less than the minimum
operating voltage of the AD7148 without the need for external
level-shifters. The V
supplies as low as 1.65 V and as high as V
LOW BYTE [7:0]
HIGH BYTE [15:8]
READ DATA
WRITE DATA
LOW BYTE [7:0]
READ DATA
DRIVE
LOW BYTE [7:0]
HIGH BYTE [15:8]
WRITE DATA
READ DATA
pin can be connected to voltage
HIGH BYTE [15:8]
READ DATA
P
LOW BYTE [7:0]
READ DATA
CC
.
LOW BYTE [7:0]
READ DATA
ACK
P
ACK
P