Datasheet

AVDD
AGND
AGND
NC
AINGND
AIN7
DIN
SCLK
CS
HVSS
HVDD
AIN0
1
2
3
4
5
6
18
17
16
15
14
13
ThermalPad
(BottomSide)
REF
24
AIN6
7
REFGND
23
AIN5
8
AL_PD
22
AIN4
9
DVDD
21
AIN3
10
DGND
20
AIN2
11
DOUT
19
AIN1
12
ADS8634
ADS8638
www.ti.com SBAS541A –MAY 2011– REVISED AUGUST 2011
RGE PACKAGE
4mm × 4mm QFN-24
(TOP VIEW)
Figure 2. ADS8638 Pin Configuration
ADS8638 PIN ASSIGNMENTS
PIN NUMBER NAME FUNCTION DESCRIPTION
1 AVDD Analog power supply Analog power supply
2, 3 AGND Analog power supply Analog ground
This pin is not internally connected; do not float this pin.
4 NC —
It is recommended to connect this pin to AGND.
5 AINGND Input Common for all analog input channels; acts as ground sense terminal
6 AIN7 Analog input Analog input channel 7
7 AIN6 Analog input Analog input channel 6
8 AIN5 Analog input Analog input channel 5
9 AIN4 Analog input Analog input channel 4
10 AIN3 Analog input Analog input channel 3
11 AIN2 Analog input Analog input channel 2
12 AIN1 Analog input Analog input channel 1
13 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 indicating alarm (programmed as an output pin)
22 AL_PD
Active low, asynchronous power-down
Digital input
(programmed as an input pin, default condition)
Reference ground input to device when an external reference is selected.
23 REFGND Analog input This pin acts as 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 reference decoupling terminal when an internal reference is selected.
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Product Folder Link(s): ADS8634 ADS8638