AD5940 datasheet(9/134 Pages) AD

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Data Sheet

AD5940/AD5941

Rev. C | Page 9 of 134

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 18); 0.1 Hz to

200 kHz

Magnitude

±0.5

Phase

±0.5

Degrees

Accuracy

R1 = R2 = R3 = 100 Ω connected

(see Figure 18); 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 18; 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

200,00

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

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