AD7991 Analog Devices, AD7991 Datasheet - Page 23
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AD7991
Manufacturer Part Number
AD7991
Description
4-Channel, 12-Bit ADC with I2C Compatible Interface in 8-Lead SOT-23
Manufacturer
Analog Devices
Datasheet
1.AD7991.pdf
(28 pages)
Specifications of AD7991
Resolution (bits)
12bit
# Chan
4
Sample Rate
140kSPS
Interface
I²C/Ser 2-Wire
Analog Input Type
SE-Uni
Ain Range
Uni (Vref),Uni Vdd
Adc Architecture
SAR
Pkg Type
SOT
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD7991YRJZ-0500RL7
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Part Number:
AD7991YRJZ-0RL
Manufacturer:
ADI/亚德诺
Quantity:
20 000
WRITING TO THE AD7991/AD7995/AD7999
By default, each part operates in read-only mode and all four chan-
nels are selected as enabled in the configuration register. To write
to the AD7991/AD7995/AD7999 configuration register, the user
must first address the device.
SCL
SDA
START BY
MASTER
0
1
1
SERIAL BUS ADDRESS BYTE
0
Figure 24. Writing to the AD7991/AD7995/AD7999 Configuration Register
1
FRAME 1
0
0
A0
Rev. B | Page 23 of 28
R/W
ACK BY
ADC
9
D7
1
The configuration register is an 8-bit register; therefore, only
one byte of data can be written to this register. However, writing
a single byte of data to this register consists of writing the serial
bus write address, followed by the data byte written (see Figure 24).
D6
CONFIGURATION REGISTER BYTE
D5
D4
D3
D2
AD7991/AD7995/AD7999
D1
D0
ACK BY
ADC
9
STOP