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Data Sheet

AD5940/AD5941

SPECIFICATIONS

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Rev. D | 9 of 143

Table 1. (Continued)

Parameter

Symbol

Min

Typ

Max

Unit

Test Conditions/Comments

Accuracy

Magnitude

−1.25

±0.2

+1.25

20 kHz to 200 kHz

±0.2

10 Hz to 20 kHz

±1

1 Hz to <10 Hz

Phase

−0.3

±0.1

+0.3

Degrees

Three-Resistor Star Cell

Accuracy

R1 = R2 = R3 = 2.2 Ω (see Figure 17); 0.1 Hz to 200 kHz

Magnitude

±0.5

Phase

±0.5

Degrees

Accuracy

R1 = R2 = R3 = 100 Ω connected (see Figure 17); 0.1 kHz

to 200 kHz

Magnitude

±0.2

Phase

±0.2

Degrees

With High Bandwidth Loop, 50 kHz, 4‑Wire

Isolated

For Z = 1 kΩ (0.1% tolerant resistor); excitation frequency

= 50 kHz; sine amplitude = 0.6 V p-p; RTIA = 1 kΩ;

CTIA = 32 pF; Isolation Capacitor 1 (CISO1) = 15 nF;

Isolation Capacitor 2 (CISO2) = Isolation Capacitor 3 (CISO3)

= Isolation Capacitor 4 (CISO4) = 470 nF; current-limiting

resistor (RLIMIT) = 1 kΩ

Accuracy

Device to device repeatability for three devices at 50 kHz

Magnitude

0.26

Percentage error

Phase

Degrees

With Low Bandwidth Loop

For Z = 100 kΩ; excitation frequency = 100 Hz; sine

amplitude = 1.1 V p-p; RTIA = 100 kΩ; CTIA = 100 nF; CISO1 =

15 nF; CISO2 = 470 nF; RLIMIT = 1000 Ω

Frequency Range

300

Accuracy2

Device to device repeatability for three devices at 100 Hz

Magnitude

±0.3

Percentage error

Precision2

Magnitude

450

Ω

Standard deviation

High Speed Loop

See Figure 17; valid for impedance spectroscopy,

voltammetry, and pulse tests

Allowed External Load Capacitance2

100

R2 + R3 ≤ 100 Ω; R1 ≤ 100 Ω

R2 + R3 ≤ 500 Ω; R1 ≤ 100 Ω

R2 + R3 ≤ 1600 Ω; R1 ≤ 800 Ω; frequency ≥ 1 kHz

Excitation Amplifier Bandwidth2

MHz

Impedance Frequency Range2

0.015

200,000

LOW POWER TIA AND POTENTIOSTAT

Input Bias Current2

TIA Amplifier, SE0 Pin

200

Potentiostat Amplifier

150

Offset Voltage2

150

µV

Offset Voltage Drift vs. Temperature

µV/°C

Noise2

Unity-gain mode; V p-p in 0.1 Hz to 10 Hz range

1.6

µV

Normal mode (LPTIACON0 Bit 2 = 0)

µV

Half power mode (LPTIACON0 Bit 2 = 1)

Potentiostat Source/Sink Current2

−750

+750

µA

Normal mode (LPTIACON0 Bits[4:3] = 00); from CE0

−3

High current mode (LPTIACON0 Bits[4:3] = 01 or 11 from

CE0

DC PSRR2

At RE0 pin; RTIA = 256 kΩ; RLOAD = 10 Ω

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