Datasheet

AVDD
AGND
AGND
NC
AINGND
NC
DIN
SCLK
CS
HVSS
HVDD
NC
1
2
3
4
5
6
18
17
16
15
14
13
ThermalPad
(BottomSide)
REF
24
NC
7
REFGND
23
AIN3
8
AL_PD
22
AIN2
9
DVDD
21
AIN1
10
DGND
20
AIN0
11
DOUT
19
NC
12
ADS8634
ADS8638
SBAS541A –MAY 2011– REVISED AUGUST 2011 www.ti.com
PIN CONFIGURATIONS
RGE PACKAGE
4mm × 4mm QFN-24
(TOP VIEW)
Figure 1. ADS8634 Pin Configuration
ADS8634 PIN ASSIGNMENTS
PIN NUMBER NAME FUNCTION DESCRIPTION
1 AVDD Analog power supply Analog power supply
2, 3 AGND Analog power supply Analog ground
These pins are not internally connected; do not float these pins.
4, 6, 7, 12, 13 NC —
It is recommended to connect these pins to AGND.
5 AINGND Input Common for all analog input channels; acts as ground sense terminal
8 AIN3 Analog input Analog input channel 3
9 AIN2 Analog input Analog input channel 2
10 AIN1 Analog input Analog input channel 1
11 AIN0 Analog input Analog input channel 0
14 HVDD High-voltage power supply High-voltage positive supply for multiplexer channels
15 HVSS High-voltage power supply High-voltage negative supply for multiplexer channels
16 CS Digital input Chip select input
17 SCLK Digital input Serial clock input
18 DIN Digital input Serial data input
19 DOUT Digital output Serial data output
20 DGND Digital power supply Digital ground
21 DVDD Digital power supply Digital I/O supply
Digital output Active high, output indicates alarm (programmed as an output pin)
Active low, asynchronous power-down.
22 AL_PD
The device features an internal, weak pull-up resistor from the AL_PD pin to DVDD. The
Digital input
AL_PD pin can also be floated when programmed as a power-down input.
(The default condition for this pin is programmed as a power-down input pin.)
Reference ground input to device when an external reference is selected.
23 REFGND Analog input This pin acts as a reference decoupling ground terminal when an internal reference is
selected.
Reference input to device when an external reference is selected.
24 REF Analog input
This pin acts as a reference decoupling terminal when an internal reference is selected.
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Product Folder Link(s): ADS8634 ADS8638