AD5941 datasheet(8/143 Pages) AD

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Data Sheet

AD5940/AD5941

SPECIFICATIONS

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Rev. D | 8 of 143

Table 1. (Continued)

Parameter

Symbol

Min

Typ

Max

Unit

Test Conditions/Comments

PGA gain = 1, 1.5, and 2

762

PGA gain = 4

702

PGA gain = 9

Total Harmonic Distortion2

THD

−84

Peak Harmonic or Spurious Noise2

−86

Channel to Channel Crosstalk2

−86

Measured on adjacent channels

Noise (RMS)9

800

nV/√Hz

Chop on

400

nV/√Hz

Chop off

ADC INPUT

Input to ADC mux

Input Voltage Ranges2

0.2

2.1

Voltage applied to any input pin

Pseudo differential voltage between VBIAS_ CAP pin and

analog input from ADC mux

−0.9

+0.9

Gain = 1

−0.9

+0.9

Gain = 1.5

−0.6

+0.6

Gain = 2

−0.3

+0.3

Gain = 4

−0.133

+0.133

Gain = 9

Input Current Range2

0.00005

3000

µA

Low power TIA and high speed TIA current input channel

ranges

Common Mode Range2

0.2

1.1

2.1

Leakage Current

−1.5

±0.5

+1.5

AIN0, AIN1, AIN2, AIN3/BUF_VREF1V82, AIN4/LPF0, AIN6

(TA = −40°C to +85°C)

−6

CE0, RE0, SE0 and DE0 (TA = −40°C to 85°C)

−3.5

±0.5

+3.5

AIN0, AIN1, AIN2, AIN3/BUF_VREF1V82, AIN4/LPF0, AIN6

(TA = −40°C to +105°C)

−8

CE0, RE0, SE0 and DE0 (TA = −40°C to +105°C)

Input Current2

−8

±2

AIN0, AIN1, AIN2, AIN3, AIN4, AIN6, CE0, RE0, SE0, and

DE0

Input Capacitance2

During ADC acquisition

Antialias Filter 3 dB Frequency Range2

Three programmable settings

Mode 0

kHz

Mode 1

100

kHz

Mode 2

250

kHz

ADC Channel Switch Settling Time

Time delay required after switching ADC input channel;

excludes sinc3 settling time

Antialias Filter −3 dB Cutoff Frequency2

250 kHz

µs

100 kHz

µs

50 kHz

µs

DISCRETE FOURIER TRANSFORM (DFT)-

BASED IMPEDANCE MEASUREMENTS2

With High Bandwidth Loop

For impedance (Z) of 1000 Ω (0.1% tolerant resistor),

excitation frequency = 0.1 Hz to 200 kHz, sine amplitude

= 10 mV rms, RTIA = 5 kΩ; RCAL = 200 Ω;1% accurate

temperature coefficient 5 ppm/°C; single DFT measure-

ment; DFT using 8192 ADC samples; Hanning on;

HSDACCON Bits[8:1] = 0x1B for low power mode and

impedance measurements ≤80 kHz; HSDACCON Bits[8:1]

= 0x7 for high power mode and impedance measurements

≥80 kHz

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