ADS8684
,
ADS8688
ZHCSCR1B –JULY 2014–REVISED AUGUST 2014
www.ti.com.cn
Pin Functions (continued)
PIN
NAME I/O DESCRIPTION
NO.
ADS8684 ADS8688
10 AUX_IN Analog input Auxiliary input channel: positive input. Decouple with AUX_GND on pin 11.
11 AUX_GND Analog input Auxiliary input channel: negative input. Decouple with AUX_IN on pin 10.
Analog input channel 6: Positive input. Decouple with AIN_6GND on pin 13.
12 NC AIN_6P Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
Analog input channel 6: negative input. Decouple with AIN_6P on pin 12.
13 NC AIN_6GND Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
Analog input channel 7: positive input. Decouple with AIN_7GND on pin 15.
14 NC AIN_7P Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
Analog input channel 7: negative input. Decouple with AIN_7P on pin 14.
15 NC AIN_7GND Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
16 AIN_0P Analog input Analog input channel 0: positive input. Decouple with AIN_0GND on pin 17.
17 AIN_0GND Analog input Analog input channel 0: negative input. Decouple with AIN_0P on pin 16.
18 AIN_1P Analog input Analog input channel 1: positive input. Decouple with AIN_1GND on pin 19.
19 AIN_1GND Analog input Analog input channel 1: negative input. Decouple with AIN_1P on pin 18.
20 AIN2_GND Analog input Analog input channel 2: positive input. Decouple with AIN_2GND on pin 21.
21 AIN_2P Analog input Analog input channel 2: negative input. Decouple with AIN_2P on pin 20.
22 AIN_3GND Analog input Analog input channel 3: positive input. Decouple with AIN_3GND on pin 23.
23 AIN_3P Analog input Analog input channel 3: negative input. Decouple with AIN_3P on pin 22.
Analog input channel 4: positive input. Decouple with AIN_4GND on pin 25.
24 NC AIN_4GND Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
Analog input channel 4: negative input. Decouple with AIN_4P on pin 24.
25 NC AIN_4P Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
Analog input channel 5: positive input. Decouple with AIN_5GND on pin 27.
26 NC AIN_5GND Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
Analog input channel 5: negative input. Decouple with AIN_5P on pin 26.
27 NC AIN_5P Analog input
No connection for the ADS8684: this pin can be left floating or connected to AGND.
28 AGND Power supply Analog ground pin
29 AGND Power supply Analog ground pin
30 AVDD Power supply Analog supply pin. Decouple with AGND on pin 31.
31 AGND Power supply Analog ground pin. Decouple with AVDD on pin 30.
32 AGND Power supply Analog ground pin
33 DGND Power supply Digital ground pin. Decouple with DVDD on pin 34.
34 DVDD Power supply Digital supply pin. Decouple with DGND on pin 33.
35 DNC Do not connect Do not connect this pin to any node; must remain floating.
36 SDO Digital output Data output for serial communication
37 SCLK Digital input Clock input for serial communication
38 CS Digital input Active low logic input; chip-select signal
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