Datasheet
36
35
34
33
32
31
30
29
28
27
26
25
AIN12
AIN13
AIN14
AIN15
AINCOM
VREFP
VREFN
DGND
DVDD
CS
START
DRDY
AIN4
CLKIO
AIN5
GPIO0
AIN6
GPIO1
AIN7
GPIO2
MUXOUTP
GPIO3
MUXOUTN
GPIO4
ADCINP
GPIO5
ADCINN
GPIO6
AIN8
GPIO7
AIN9
SCLK
AIN10
DIN
AIN11
DOUT
1
2
3
4
5
6
7
8
9
10
11
12
AIN3
AIN2
AIN1
AIN0
AVSS
AVDD
PLLCAP
XTAL1
XTAL2
PWDN
RESET
CLKSEL
48 47 46
45
44 43
42
41
40 39 38
13
14
15 16
17
18 19 20
21 22
23
37
24
ADS1158
ADS1158
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SBAS429D –JUNE 2008– REVISED MARCH 2011
PIN CONFIGURATION
QFN PACKAGE
(TOP VIEW)
PIN ASSIGNMENTS
ANALOG/DIGITAL
PIN # NAME INPUT/OUTPUT DESCRIPTION
1 AIN3 Analog input Analog input 3: single-ended channel 3, differential channel 1 (–)
2 AIN2 Analog input Analog input 2: single-ended channel 2, differential channel 1 (+)
3 AIN1 Analog input Analog input 1: single-ended channel 1, differential channel 0 (–)
4 AIN0 Analog input Analog input 0: single-ended channel 0, differential channel 0 (+)
Negative analog power supply: 0V for unipolar operation, –2.5V for bipolar operation.
5 AVSS Analog
(Internally connected to exposed thermal pad of QFN package.)
6 AVDD Analog Positive analog power supply: +5V for unipolar operation, +2.5V for bipolar operation.
7 PLLCAP Analog PLL bypass capacitor: connect 22nF capacitor to AVSS when using crystal oscillator.
8 XTAL1 Analog 32.768kHz crystal oscillator input 1; see Crystal Oscillator section.
9 XTAL2 Analog 32.768kHz crystal oscillator input 2; see Crystal Oscillator section.
10 PWDN Digital input Power-down input: hold low for minimum of two f
CLK
cycles to engage low-power mode.
11 RESET Digital input Reset input: hold low for minimum of two f
CLK
cycles to reset the device.
Clock select input: Low = activates crystal oscillator, f
CLK
output on CLKIO.
12 CLKSEL Digital input
High = disables crystal oscillator, apply f
CLK
to CLKIO.
13 CLKIO Digital I/O System clock input/output (see CLKSEL pin)
14 GPIO0 Digital I/O General-purpose digital input/output 0
15 GPIO1 Digital I/O General-purpose digital input/output 1
16 GPIO2 Digital I/O General-purpose digital input/output 2
17 GPIO3 Digital I/O General-purpose digital input/output 3
18 GPIO4 Digital I/O General-purpose digital input/output 4
19 GPIO5 Digital I/O General-purpose digital input/output 5
20 GPIO6 Digital I/O General-purpose digital input/output 6
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