Datasheet

ADS7808
5
SBAS018A
www.ti.com
FIGURE 1. Basic Conversion Timing.
MODE
Acquire
t
4
t
5
t
1
t
3
t
7
t
6
Convert
Acquire
t
2
BUSY
CS, R/C
TABLE II. Conversion and Data Timing T
A
= –40°C to +85°C.
FIGURE 2. Serial Data Timing Using Internal Clock. (CS, EXT/INT and TAG Tied LOW.)
SYMBOL DESCRIPTION MIN TYP MAX UNITS
t
1
Convert Pulse Width 40 4500 ns
t
2
BUSY Delay 65 ns
t
3
BUSY LOW 8 µs
t
4
BUSY Delay after 220 ns
End of Conversion
t
5
Aperture Delay 40 ns
t
6
Conversion Time 5.7 8 µs
t
7
Acquisition Time 2 µs
t
6
+ t
7
Throughput Time 9 10 µs
t
8
R/C LOW to DATACLK Delay 450 ns
t
9
DATACLK Period 440 ns
t
10
Data Valid to DATACLK 20 75 ns
HIGH Delay
t
11
Data Valid after 100 125 ns
DATACLK LOW Delay
t
12
External DATACLK Period 100 ns
t
13
External DATACLK HIGH 20 ns
t
14
External DATACLK LOW 30 ns
t
15
DATACLK HIGH 20 t
12
+ 5 ns
Setup Time
t
16
R/C to CS 10 ns
Setup Time
t
17
SYNC Delay After 15 35 ns
DATACLK HIGH
t
18
Data Valid Delay 25 55 ns
t
19
CS to Rising Edge Delay 25 ns
t
20
Data Available after CS LOW 4.5 µs
1
MSB Valid
R/C
DATACLK
SDATA
t
8
t
11
t
10
t
9
2 3 11 12
Bit 10 Valid Bit 1 ValidBit 9 Valid LSB Valid
t
2
t
3
BUSY