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| ADS7808 Datasheet, PDF (5/10 Pages) Burr-Brown (TI) – 12-Bit 10ms Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER | |||
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SYMBOL
DESCRIPTION
MIN TYP MAX UNITS
t1
Convert Pulse Width
40
4500 ns
t2
BUSY Delay
65 ns
t3
BUSY LOW
8
µs
t4
BUSY Delay after
End of Conversion
220
ns
t5
t6
t7
t6 + t7
t8
t9
t10
Aperture Delay
40
ns
Conversion Time
5.7 8
µs
Acquisition Time
2
µs
Throughput Time
9 10 µs
R/C LOW to DATACLK Delay
450
ns
DATACLK Period
440
ns
Data Valid to DATACLK
20 75
ns
HIGH Delay
t11
Data Valid after
100 125
ns
DATACLK LOW Delay
t12
External DATACLK Period
100
ns
t13
External DATACLK HIGH
20
ns
t14
External DATACLK LOW
30
ns
t15
DATACLK HIGH
20
t12 + 5 ns
Setup Time
t16
R/C to CS
10
ns
Setup Time
t17
SYNC Delay After
15
35 ns
DATACLK HIGH
t18
Data Valid Delay
25
t19
CS to Rising Edge Delay
25
t20
Data Available after CS LOW 4.5
55 ns
ns
µs
TABLE II. Conversion and Data Timing TA = â40°C to
+85°C.
t1
CS, R/C
BUSY
t2
t5
MODE Acquire
t3
Convert
t6
FIGURE 1. Basic Conversion Timing.
R/C
DATACLK
SDATA
t2
BUSY
t8
t9
1
2
3
t11
t10
MSB Valid Bit 10 Valid Bit 9 Valid
t3
11
12
Bit 1 Valid
LSB Valid
FIGURE 2. Serial Data Timing Using Internal Clock. (CS, EXT/INT and TAG Tied LOW.)
t4
Acquire
t7
®
5
ADS7808
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