SERIAL OUTPUT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

ADS8517

+5 V

+

+

ConvertPulse

40nsmin

0.1 mF

10 mF

+

NC

(1)

BUSY

R/C

SDATA

±10 V

+

NC

(1)

NC

(1)

NC

(1)

NC

(1)

NC

(1)

NC

(1)

NC

(1)

DATACLK

NOTE:(1)NC=notconnected.

2.2 F

m

22 F

m

+1.8V

0.1 F

m

ADS8517

Figure 29 shows a basic circuit to operate the ADS8517 with a ±10-V input range and serial output. Taking R/C

(pin 22) low for 40 ns (5

µs max) initiates a conversion and outputs valid data from the previous conversion on

SDATA (pin 19) synchronized to 16 clock pulses output on DATACLK (pin 18). BUSY (pin 24) goes low and

stays low until the conversion completes and the serial data have been transmitted. Data are output in BTC

format, MSB first, and are valid on both the rising and falling edges of the data clock. BUSY going high can be

used to latch the data. All convert commands are ignored while BUSY is low.

The ADS8517 begins tracking the input signal at the end of the conversion. Allowing 5

µs between convert

commands assures accurate acquisition of a new signal.

Figure 29. Basic ±10-V Operation with Serial Output

Copyright © 2008, Texas Instruments Incorporated

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