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Data Sheet

AD5940

Rev. 0 | Page 39 of 130

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.

0x0

R/W

Normal mode.

Increase amplifier output stage current to quickly charge external capacitor load. This

setting is intended for use with high current sensors.

Double TIA and PA overall quiescent current and increase amplifier bandwidth. This

setting is useful for diagnostic tests.

Double TIA and PA overall quiescent current and increase output stage current. This

setting increases amplifier bandwidth and output current capability.

HALFPWR

Half power mode select. This control bit reduces the active power consumption of the

TIA and PA for Sensor Channel 0.

0x0

R/W

Normal mode (default).

Reduces PA and TIA current by half.

PAPDEN

PA power-down. Low power Potentiostat power-down control bit.

0x1

R/W

Power-up.

Power-down.

TIAPDEN

TIA power-down. Low power TIA power-down control bit.

0x1

R/W

Power-up.

Power-down.

AD5940 Datasheet(PDF) 39 Page - Analog Devices

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