AD677 データシートの表示（PDF） - Analog Devices
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AD677 Datasheet PDF : 16 Pages
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AD677
TIMING SPECIFICATIONS (TMIN to TMAX, VCC = +12 V ؎ 5%, VEE = –12 V ؎ 5%, VDD = +5 V ؎ 10%)1
Parameter
Symbol
Min
Typ
Max
Units
Conversion Period2, 3
CLK Period4
Calibration Time
Sampling Time
Last CLK to SAMPLE Delay5
SAMPLE Low
SAMPLE to Busy Delay
1st CLK Delay
CLK Low6
CLK High6
CLK to BUSY Delay
CLK to SDATA Valid
CLK to SCLK High
SCLK Low
SDATA to SCLK High
CAL High Time
CAL to BUSY Delay
tC
tCLK
tCT
tS
tLCS
tSL
tSS
tFCD
tCL
tCH
tCB
tCD
tCSH
tSCL
tDSH
tCALH
tCALB
10
480
2
2.1
100
30
50
50
50
180
50
100
100
180
50
80
50
80
50
15
1000
µs
ns
85532
tCLK
µs
µs
ns
75
ns
ns
ns
ns
300
ns
175
ns
300
ns
ns
ns
ns
50
ns
NOTES
1See the “CONVERSION CONTROL” and “AUTOCALIBRATION” sections for detailed explanations of the above timing.
2Depends upon external clock frequency; includes acquisition time and conversion time. The maximum conversion period is specified to account for the droop of the
internal sample/hold function. Operation at slower rates may degrade performance.
3tC = tFCD + 16 × tCLK + tLCS.
4580 ns is recommended for optimal accuracy over temperature (not necessary during calibration cycle).
5If SAMPLE goes high before the 17th CLK pulse, the device will start sampling approximately 100 ns after the rising edge of the 17th CLK pulse.
6tCH + tCL = tCLK and must be greater than 480 ns.
CAL
tCALH
tCT
(INPUT)
BUSY
(OUTPUT)
CLK*
(INPUT)
tCALB
tFCD
1
2
tCH
3
tCL
tCB
85530 85531 85532
tCLK
*SHADED PORTIONS OF INPUT SIGNALS ARE OPTIONAL. FOR BEST PERFORMANCE, WE
RECOMMEND THAT THESE SIGNALS BE HELD LOW EXCEPT WHEN EXPLICITY SHOWN HIGH.
Figure 1. Calibration Timing
SAMPLE*
(INPUT)
BUSY
(OUTPUT)
CLK*
(INPUT)
SCLK
(OUTPUT)
SDATA
(OUTPUT)
tS
tSL
tSB
tFCD
1
tCLK
tCH
2 tCL 3
tCSH
tC
tS
tCB
tLCS
15
16
17
tCD
OLD BIT 16
tSCL
tDSH
MSB
BIT
2
BIT
13
BIT
14
BIT
15
BIT
16
*SHADED PORTIONS OF INPUT SIGNALS ARE OPTIONAL. FOR BEST PERFORMANCE, WE
RECOMMEND THAT THESE SIGNALS BE HELD LOW EXCEPT WHEN EXPLICITY SHOWN HIGH.
Figure 2. General Conversion Timing
–4–
REV. A
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