AD7928 Analog Devices, AD7928 Datasheet - Page 25

• Manufacturer Part Number: AD7928
• Description: 8-Channel, 1 MSPS, 12-Bit ADC with Sequencer in 20-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7928

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: SOP

DOUT
DOUT
SCLK
SCLK
THREE-STATE
THREE-STATE
DIN
DIN
CS
CS
t
t
t
t
2
2
3
3
DOUT
SCLK
DOUT
SCLK
THREE-STATE
THREE-STATE
DIN
DIN
CS
CS
ZERO
ZERO
WRITE
WRITE
1
1
THREE IDENTIFICATION BITS
THREE IDENTIFICATION BITS
ADD2
ADD2
SEQ1
t
t
SEQ
9
9
ZERO
ZERO
t
t
WRITE
2
2
V
2
2
IN
1
t
t
1
0
ADD1
ADD1
3
THREE IDENTIFICATION BITS
3
ADD2
ADD2
DONTC
DONTC
THREE IDENTIFICATION BITS
t
SEQ
t
9
9
V
IN
3
3
1
2
t
2
t
ADD0
ADD0
4
4
ADD1
Figure 29. AD7928 Writing to SHADOW Register Timing Diagram
ADD1
SEQUENCE 1
ADD2
ADD2
DONTC
V
IN
4
4
Figure 26. AD7908 Serial Interface Timing Diagram
Figure 27. AD7918 Serial Interface Timing Diagram
Figure 28. AD7928 Serial Interface Timing Diagram
2
3
3
DB7
DB7
ADD0
ADD0
t
ADD1
ADD1
t
6
6
ADD2
V
IN
5
5
3
4
t
t
4
7
7
DB6
DB6
t
t
DB11
t
DB11
CONVERT
CONVERT
t
t
CONVERT
t
CONVERT
4
ADD0
ADD0
4
t
ADD1
t
t
t
Rev. D | Page 25 of 32
6
10
10
6
V
IN
6
6
t
10
t
5
4
5
10
DB10
DB10
ADD0
V
IN
11
11
6
5
6
DB0
t
DB2
t
7
CODING DONTC
7
CODING DONTC
12
12
13
13
ZERO
DB1
DB2
DB2
DONTC
B
13
13
14
t
5
t
14
ZERO
SEQUENCE 2
5
DB0
DB1
DONTC
DONTC
DONTC
DB1
FOUR TRAILING ZEROS
B
B
TWO TRAILING ZEROS
V
14
14
IN
t
t
15
5
5
6
15
ZERO
ZERO
t
DB0
8
DONTC
DONTC
DONTC
t
DB0
AD7908/AD7918/AD7928
8
V
15
15
IN
16
t
16
7
11
t
t
t
ZERO
ZERO
THREE-STATE
8
8
11
THREE-STATE
DONTC
DONTC
C
t
QUIET
16
16
t
t
11
11
THREE-STATE
THREE-STATE
t
t
QUIET
QUIET