Datasheet
GND
AVDD
REF
REFGND
PDEN
CHSEL
NC
NC
1
2
3
4
12
11
10
9
DVDD
16
AIN0
5
15
14
13
6
7
8
SDO
AIN0GND
SCLK
AIN1GND
CS
AIN1
ADS7946
ADS7945
ADS7946
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SBAS539B –JUNE 2011– REVISED SEPTEMBER 2011
PIN CONFIGURATION ADS7946 (SINGLE-ENDED)
RTE PACKAGE
QFN-16
(TOP VIEW)
Table 3. PIN FUNCTIONS
PIN
NO. PIN NAME FUNCTION DESCRIPTION
1 GND Analog/digital Power supply ground; all analog and digital signals are referred with respect to this pin
2 AVDD Analog ADC power supply
3 REF Analog ADC positive reference input; decouple this pin with REFGND
4 REFGND Analog Reference return; short to analog ground plane
5 AIN0 Analog input Positive analog input, channel 0
6 AIN0GND Analog input Ground sense analog input, channel 0
7 AIN1GND Analog input Ground sense analog input, channel 1
8 AIN1 Analog input Positive analog input, channel 1
9 NC — Not connected internally, it is recommended to externally short this pin to GND
10 NC — Not connected internally, it is recommended to externally short this pin to GND
This pin selects the analog input channel.
Low = Channel 0
11 CH SEL Digital input High = Channel 1
It is recommended to change the channel within a window of one clock; from half a clock after the CS
falling edge. This change ensures the settling on the multiplexer output before the sample start.
12 PDEN Digital input This pin enables a power-down feature if it is high at the CS rising edge
13 CS Digital input Chip select signal; active low
14 SCLK Digital input Serial SPI clock
15 SDO Digital output Serial data out
16 DVDD Digital Digital I/O supply
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