AD5940
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
AD5940
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
1
2
3
4
5
6
7
8
A
B
C
AFE4
AFE3
AIN2
AVDD
VREF_1V82
SE0
CE0
RE0
AIN4/
LPF0
AIN3/
BUF_VREF1V8
RCAL1
RCAL0
AFE1
AFE2
AIN1
DNC
DE0
V
RC0_1
RC0_0
ZERO0
AGND
AIN6
RC0_2
V
BIAS0
D
E
VBIAS_CAP
GPIO2
AIN0
DNC
DNC
AGND_REF
DGND
GPIO1
DGND
VREF_2V5
MOSI
AVDD_REG
MISO
GPIO3
AGND
DGND
F
RESET
DNC
AVDD
DVDD
GPIO6
GPIO7
GPIO0
XTALI
GPIO5
XTALO
CS
SCLK
DNC
DVDD_
REG_1V8
G
IOVDD
GPIO4
ANALOG POWER/GROUND
DIGITAL POWER/GROUND
DIGITAL
XTAL
ANALOG
REFERENCE
DNC = DO NOT CONNECT.
Figure 4. Pin Configuration
Table 7. Pin Function Descriptions
Input/Output
Pin No.
Mnemonic
Supply
Analog
Analog
Analog
Supply
Analog
Analog
Description
A1
A2
A3
A4
A5
A6
AFE4
AFE3
AIN2
AVDD
VREF_1V82
SE0
Uncommitted Analog Front End Pin 4.
Uncommitted Analog Front End Pin 3.
Uncommitted Analog Input Pin 2. This pin connects to the switch matrix.
Analog Circuit Power. Short this pin to Pin F2 (AVDD).
1.82 V Reference Decoupling Capacitor Pin.
Sense Electrode Input Pin for High Bandwidth and Low Bandwidth Loop Circuits.
This pin connects to the switch matrix.
A7
A8
CE0
RE0
Analog
Analog
Counter Electrode Input Pin for High Bandwidth and Low Bandwidth Loop Circuits.
This pin connects to the switch matrix.
Reference Electrode Input Pin for High Bandwidth and Low Bandwidth Loop
Circuits. This pin connects to positive node of the switch matrix.
Terminal B of Calibration Resistor (RCAL). Connect this pin to the switch matrix.
B1
B2
B3
B4
RCAL1
AFE1
AIN1
Analog
Analog
Analog
Analog
Uncommitted Analog Front End Pin 1.
Uncommitted Analog Input Pin 1. This pin connects to the switch matrix.
Uncommitted Analog Input Pin 4 (AIN4).
AIN4/LPF0
Low Power TIA Output Low-Pass Filter Capacitor Pin (LPF0).
Uncommitted Analog Input Pin 3 (AIN3).
B5
AIN3/BUF_VREF1V8 Analog
1.82 V Reference Buffered Output (BUF_VREF1V8). This pin connects to the switch
matrix.
B6
B7
DE0
VZERO0
Analog
Analog
Analog Input Pin. This pin connects to the input and output of the high speed TIA.
Low Power, Dual-Output DAC Zero Voltage Output Pin.
Rev. 0 | Page 18 of 130
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