ADS8370 Datasheet, PDF (26/35 Pages) Burr-Brown (TI) – 16-BIT, 600-kHz, PSEUDO-DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH SERIAL INTERFACE AND REFERENCE

ADS8370
SLAS450 – JUNE 2005
Table 3. Power Supply Decoupling Capacitor Placement
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SUPPLY PINS
Pair of pins requiring a shortest path to
decoupling capacitors
Pins requiring no decoupling
CONVERTER ANALOG SIDE
(2,3); (5,6); (15,16); (17,18)
4, 14, 19
CONVERTER DIGITAL
SIDE
(20,21)
When using the internal reference, ensure a shortest path from REFOUT (pin 9) to REFIN (pin 8) with the
bypass capacitor directly between pins 8 and 7.
APPLICATION INFORMATION
EXAMPLE DIGITAL STIMULUS
The use of the ADS8370 is very straightforward. The following timing diagram shows one example of how to
achieve a 600-KSPS throughput using a SPI compatible serial interface.
BUSY
DEVICE STATE
CONVERT
SAMPLE
CONVERT
CONVST
Frequency = 600 kHz
15 ns
CS
485 ns
15 ns
80 ns
50 ns
SCLK
25 ns
2
3
15 16
SDO
12.5 ns
MSB
D15 D14 D13 D2 D1
LSB
D0
Figure 56. Example Stimulus in SPI Mode (FS =1), Back-To-Back Conversion that Achieves 600 KSPS
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