Datasheet
PIN CONFIGURATION
V
DIG
V
ANA
BUSY
CS
R/C
BYTE
TAG
SDATA
DATACLK
D0
D1
D2
R1
IN
AGND1
CAP
REF
AGND2
D7
D6
D5
D4
D3
DGND
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
R2
IN
SB/BTC
EXT/INT
REFD
PWRD
ADS8517
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................................................................................................................................................. SLAS527A – SEPTEMBER 2008 – REVISED JUNE 2009
DW, PW PACKAGES
SO-28, TSSOP-28
(TOP VIEW)
PIN ASSIGNMENTS
PIN
DIGITAL
NAME NO. I/O DESCRIPTION
R1
IN
1 Analog Input.
AGND1 2 Analog sense ground. Used internally as ground reference point. Minimal current flow
R2
IN
3 Analog Input.
CAP 4 Reference buffer output. 2.2- µ F tantalum capacitor to ground.
Reference input/output. Outputs internal 2.5-V reference. Can also be driven by external system
REF 5
reference. In both cases, bypass to ground with a 2.2- µ F tantalum capacitor.
AGND2 6 Analog ground
Output mode select. Selects straight binary or binary twos complement for output data format. If
SB/ BTC 7 I high, data are output in a straight binary format. If low, data are output in a binary twos
complement format.
External/internal data select. Selects external/internal data clock for transmitting data. If high,
data is output synchronized to the clock input on DATACLK. If low, a convert command initiates
EXT/ INT 8 I
the transmission of the data from the previous conversion, along with 16-clock pulses output on
DATACLK.
Data bit 7 if BYTE is high. Data bit 15 (MSB) if BYTE is low. High-Z when CS is high and/or R/ C
D7 9 O
is low. Leave unconnected when using serial output.
D6 10 O Data bit 6 if BYTE is high. Data bit 14 if BYTE is low. High-Z when CS is high and/or R/ C is low.
D5 11 O Data bit 5 if BYTE is high. Data bit 13 if BYTE is low. High-Z when CS is high and/or R/ C is low.
D4 12 O Data bit 4 if BYTE is high. Data bit 12 if BYTE is low. High-Z when CS is high and/or R/ C is low.
D3 13 O Data bit 3 if BYTE is high. Data bit 11 if BYTE is low. High-Z when CS is high and/or R/ C is low.
DGND 14 Digital ground
D2 15 O Data bit 2 if BYTE is high. Data bit 10 if BYTE is low. High-Z when CS is high and/or R/ C is low.
D1 16 O Data bit 1 if BYTE is high. Data bit 9 if BYTE is low. High-Z when CS is high and/or R/ C is low.
Data bit 0 (LSB) if BYTE is high. Data bit 8 if BYTE is low. High-Z when CS is high and/or R/ C is
D0 17 O
low.
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