AD7951 Analog Devices, AD7951 Datasheet - Page 28

• Manufacturer Part Number: AD7951
• Manufacturer: Analog Devices

Specifications of AD7951

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 1MSPS
• Interface: Byte,Par,Ser,SPI
• Analog Input Type: Diff-Bip,Diff-Uni
• Ain Range: Bip 10V,Bip 5.0V,Uni 10V,Uni 5.0V
• Adc Architecture: SAR
• Pkg Type: CSP,QFP

AD7951
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 has been
initiated. This method allows the full throughput and the use of a
slower SDCLK frequency. Again, it is recommended to use a
SDCLK
*A DISCONTINUOUS SDCLK IS RECOMMENDED.
SDCLK
SDOUT
*A DISCONTINUOUS SDCLK IS RECOMMENDED.
SDOUT
CNVST
BUSY
BUSY
SDIN
CS
CS
Figure 43. Slave Serial Data Timing for Reading (Read Previous Conversion During Convert)
t
t
31
31
t
t
16
16
X*
X*
Figure 42. Slave Serial Data Timing for Reading (Read After Convert)
t
t
32
32
1
1
t
t
31
31
SER/PAR = 1
t
D13
SER/PAR = 1
D13
X13
33
2
2
D12
D12
X12
3
EXT/INT = 1
3
EXT/INT = 1
t
35
t
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34
t
D11
X11
37
13
t
4
36
t
35
t
37
D1
INVSCLK = 0
INVSCLK = 0
t
14
12
36
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*
13
RD = 0
RD = 0
DATA = SDIN
D1
X1
X*
14
D0
X0
t
27
X*
15
X13
Y13
X*
16
X12
Y12
X*
17