AD7634 Analog Devices, AD7634 Datasheet - Page 28

• Manufacturer Part Number: AD7634
• Manufacturer: Analog Devices

Specifications of AD7634

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 670kSPS
• Interface: Byte,Par,Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: 10V p-p,20 V p-p,40 V p-p
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

AD7634
External Clock Data Read After/During Conversion
It is also possible to begin to read data after conversion and
continue to read the last bits after a new conversion is initiated.
This method allows the full throughput and the use of a slower
SDCLK frequency. Again, it is recommended to use a
SDOUT
*A DISCONTINUOUS SDCLK IS RECOMMENDED.
*A DISCONTINUOUS SDCLK IS RECOMMENDED.
SDCLK
CNVST
BUSY
SDOUT
SDCLK
CS
BUSY
SDIN
CS
Figure 45. Slave Serial Data Timing for Reading (Read Previous Conversion During Convert)
t
t
31
31
t
16
t
X*
16
X*
Figure 44. Slave Serial Data Timing for Reading (Read After Convert)
t
32
t
1
32
1
t
31
t
MODE[1:0] = 3
31
D17
t
MODE[1:0] = 3
D17
X17
33
2
2
D16
D16
X16
3
EXT/INT = 1
3
Rev. A | Page 28 of 32
t
EXT/INT = 1
35
t
34
t
D15
X15
37
17
t
36
4
t
35
t
37
D1
INVSCLK = 0
INVSCLK = 0
t
18
36
16
discontinuous SDCLK whenever possible to minimize potential
incorrect bit decisions. For the different modes, the use of a slower
SDCLK, such as 20 MHz in warp mode, 15 MHz in normal mode,
and 13 MHz in impulse mode, can be used.
D0
D2
X2
X*
17
RD = 0
RD = 0
DATA = SDIN
D1
X1
X*
18
D0
X0
t
27
X*
19
X17
Y17
X*
20
X16
Y16
X*
21