Data Sheet
AD5940
Bits
Bit Name Settings Description
Reset Access
1001 12 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 12 kΩ. If RLOAD > 100 Ω. RTIA
12 kΩ − (RLOAD − 100 Ω).
=
1010 16 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 16 kΩ. If RLOAD > 100 Ω. RTIA
16 kΩ − (RLOAD − 100 Ω).
=
1011 20 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 20 kΩ. If RLOAD > 100 Ω. RTIA
20 kΩ − (RLOAD − 100 Ω).
1100 24 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 24 kΩ. If RLOAD > 100 Ω. RTIA
24 kΩ − (RLOAD − 100 Ω).
1101 30 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 30 kΩ. If RLOAD > 100 Ω. RTIA
30 kΩ − (RLOAD − 100 Ω).
1110 32 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 32 kΩ. If RLOAD > 100 Ω. RTIA
32 kΩ − (RLOAD − 100 Ω).
=
=
=
=
1111 40 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 40 kΩ. If RLOAD >100 Ω. RTIA
40 kΩ − (RLOAD − 100 Ω).
=
10000 48 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 48 kΩ. If RLOAD > 100 Ω. RTIA
48 kΩ − (RLOAD − 100 Ω).
10001 64 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 64 kΩ. If RLOAD > 100 Ω. RTIA
64 kΩ − (RLOAD − 100 Ω).
10010 85 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 85 kΩ. If RLOAD > 100 Ω. RTIA
85 kΩ − (RLOAD − 100 Ω).
10011 96 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 96 kΩ. If RLOAD > 100 Ω. RTIA
96 kΩ − (RLOAD − 100 Ω).
=
=
=
=
10100 100 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 100 kΩ. If RLOAD > 100 Ω. RTIA
100 kΩ − (RLOAD − 100 Ω).
10101 120 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 120 kΩ. If RLOAD > 100 Ω. RTIA
120 kΩ − (RLOAD − 100 Ω).
10110 128 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 128 kΩ. If RLOAD > 100 Ω. RTIA
128 kΩ − (RLOAD − 100 Ω).
10111 160 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 160 kΩ. If RLOAD > 100 Ω. RTIA
160 kΩ − (RLOAD − 100 Ω).
11000 196 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 196 kΩ. If RLOAD > 100 Ω. RTIA
196 kΩ − (RLOAD − 100 Ω).
11001 256 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 256 kΩ. If RLOAD > 100 Ω. RTIA
256 kΩ − (RLOAD − 100 Ω).
11010 512 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 512 kΩ. If RLOAD > 100 Ω. RTIA
512 kΩ − (RLOAD − 100 Ω).
=
=
=
=
=
=
=
[4:3]
IBOOST
Current boost control.
00 Normal mode.
0x0
R/W
01 Increase amplifier output stage current to quickly charge external capacitor load. This
setting is intended for use with high current sensors.
10 Double TIA and PA overall quiescent current and increase amplifier bandwidth. This
setting is useful for diagnostic tests.
11 Double TIA and PA overall quiescent current and increase output stage current. This
setting increases amplifier bandwidth and output current capability.
2
HALFPWR
Half power mode select. This control bit reduces the active power consumption of the 0x0
TIA and PA for Sensor Channel 0.
R/W
0
1
Normal mode (default).
Reduces PA and TIA current by half.
1
0
PAPDEN
TIAPDEN
PA power-down. Low power Potentiostat power-down control bit.
Power-up.
Power-down.
0x1
0x1
R/W
R/W
0
1
TIA power-down. Low power TIA power-down control bit.
0
1
Power-up.
Power-down.
Rev. 0 | Page 39 of 130