AD5941 datasheet(40/134 Pages) AD

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AD5940/AD5941

Data Sheet

Rev. C | Page 40 of 134

Bits

Bit Name

Settings

Description

Reset

Access

SW1

SW1 switch control, active high.

0x0

R/W

Opens switch.

Closes switch.

SW0

SW0 switch control, active high.

0x0

R/W

Opens switch.

Closes switch.

Low Power TIA Control Bits, Channel 0 Register—LPTIACON0

Address 0x000020EC, Reset: 0x00000003, Name: LPTIACON0

Table 24. Bit Descriptions for LPTIACON0 Register

Bits

Bit Name

Settings

Description

Reset

Access

[31:16]

Reserved

Reserved.

0x0

[15:13]

TIARF

These bits set the low-pass filter resistor (RLPF) and configure the low power TIA

output low-pass filter cutoff frequency.

0x0

R/W

Disconnects the TIA output from the low-pass filter pin (LPF0), which is useful for

diagnostics where a fast response is required from the ADC. This setting

disconnects the low power TIA output from the low-pass filter capacitor.

Bypass resistor; 0 Ω option.

20 kΩ.

100 kΩ.

100

200 kΩ.

101

400 kΩ.

110

600 kΩ.

111

1 MΩ; recommended value for optimal dc current measurement performance. This

setting is the lowest cutoff frequency setting for the low-pass filter.

[12:10]

TIARL

These bits set RLOAD.

0x0

R/W

0 Ω.

10 Ω.

30 Ω.

50 Ω.

100

100 Ω.

101

1.6 kΩ; RTIA must be ≥ 2 kΩ.

110

3.1 kΩ; RTIA must be ≥ 4 kΩ.

111

3.6 kΩ; RTIA must be ≥ 4 kΩ.

[9:5]

TIAGAIN

These bits set the RTIA.

0x0

R/W

Disconnects the RTIA.

200 Ω. The RTIA is combination of RLOAD and a fixed series 110 Ω. Assumes RLOAD = 10 Ω.

Set by the TIARL bits. RTIA = 100 Ω − RLOAD + 110 Ω. The fixed overall RTIA = 200 Ω.

1 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 1 kΩ. If RLOAD > 100 Ω, RTIA = 1 kΩ −

(RLOAD − 100 Ω).

2 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 2 kΩ. If RLOAD > 100 Ω, RTIA = 2 kΩ −

(RLOAD − 100 Ω).

100

3 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 3 kΩ. If RLOAD > 100 Ω, RTIA = 3 kΩ −

(RLOAD − 100 Ω).

101

4 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 4 kΩ. If RLOAD > 100 Ω, RTIA = 4 kΩ −

(RLOAD − 100 Ω).

110

6 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 6 kΩ. If RLOAD > 100 Ω, RTIA = 6 kΩ −

(RLOAD − 100 Ω).

111

8 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 8 kΩ. If RLOAD > 100 Ω, RTIA = 8 kΩ −

(RLOAD − 100 Ω).

1000

10 kΩ. If RLOAD ≤ 100 Ω, RTIA = (100 Ω − RLOAD) + 10 kΩ. If RLOAD > 100 Ω, RTIA =

10 kΩ − (RLOAD − 100 Ω).

AD5941 Datasheet(PDF) 40 Page - Analog Devices

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