ADAU1977WBCPZ-R7 datasheet(5/68 Pages) AD

5 / 68 page

Data Sheet

ADAU1977

Rev. C | Page 5 of 68

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

Digital Gain Post ADC

Gain step size = 0.375 dB

−35.625

+60

Gain Error

−10

+10

Interchannel Gain Mismatch

−0.25

+0.25

Gain Drift

0.6

ppm/°C

Common-Mode Rejection Ratio (CMRR)

1 V rms, 1 kHz

1 V rms, 20 kHz

Power Supply Rejection Ratio (PSRR)

100 mV rms, 1 kHz on AVDDx = 3.3 V

Interchannel Isolation

100

Interchannel Phase Deviation

Degrees

REFERENCE

Internal Reference Voltage

VREF pin

1.47

1.50

1.54

Output Impedance

kΩ

ADC SERIAL PORT

Output Sample Rate

192

kHz

For fS ranging from 44.1 kHz to 192 kHz.

DIAGNOSTIC AND FAULT SPECIFICATIONS

Applicable to differential microphone input using MICBIAS on AINxP and AINxN pins.

Table 2.

Parameter

Test Conditions/

Comments

Min

Typ

Max

Unit

INPUT VOLTAGE THRESHOLDS FOR FAULT DETECTION1

Hysteresis AINxP or AINxN Shorted to VBAT

SHT_B_TRIP = 10

0.79 × VBAT

0.85 × VBAT

0.86 × VBAT

SHT_B_TRIP = 01

0.84 × VBAT

0.9 × VBAT

0.91 × VBAT

SHT_B_TRIP = 00

0.89 × VBAT

0.95 × VBAT

0.96 × VBAT

SHT_B_TRIP = 11

0.93 × VBAT

0.975 × VBAT

0.99 × VBAT

Hysteresis AINxP and AINxN Shorted Together

SHT_T_TRIP = 00

MICBIAS(0.5 ± 0.015)

MICBIAS(0.5 ±

0.035)

MICBIAS(0.5 ±

0.047)

SHT_T_TRIP = 01

MICBIAS(0.5 ± 0.001)

MICBIAS(0.5 ±

0.017)

MICBIAS(0.5 ±

0.03)

SHT_T_TRIP = 10

MICBIAS(0.5 ± 0.05)

MICBIAS(0.5 ±

0.071)

MICBIAS(0.5 ±

0.08)

Hysteresis AINxP or AINxN Shorted to Ground

SHT_G_TRIP = 10

0.04 × VREF

0.1 × VREF

0.13 × VREF

SHT_G_TRIP = 01

0.08 × VREF

0.133 × VREF

0.16 × VREF

SHT_G_TRIP = 00

0.12 × VREF

0.2 × VREF

0.22 × VREF

SHT_G_TRIP = 11

0.19 × VREF

0.266 × VREF

0.28 × VREF

Hysteresis AINxP Shorted to MICBIAS

SHT_M_TRIP = 10

0.82 × MICBIAS

0.85 × MICBIAS

0.89 × MICBIAS

SHT_M_TRIP = 01

0.87 × MICBIAS

0.9 × MICBIAS

0.94 × MICBIAS

SHT_M_TRIP = 00

0.92 × MICBIAS

0.95 × MICBIAS

1.0 × MICBIAS

SHT_M_TRIP = 11

0.95 × MICBIAS

0.975 × MICBIAS

1.0 × MICBIAS

Hysteresis AINxP or AINxN Open Circuit2

Refer to the

AINxP shorted to

MICBIAS and the

AINxN shorted

to ground

specifications for

upper and lower

thresholds.

FAULT DURATION

Programmable

100

150

The threshold limits are tested with VREF = 1.5 V, MICBIAS = 5 V to 8.5 V, and VBAT = 11 V to 18 V set using an external source. When VBAT ≤ MICBIAS, a short to VBAT

cannot be distinguished from a short to MICBIAS, and reporting a short to VBAT fault takes precedence over a short to MICBIAS fault.

The AINxP open terminal fault cannot be distinguished from the AINxN open terminal fault because the voltage at the AINxP and AINxN pins remain at MICBIAS and

ground, respectively, when either of these two terminals becomes open circuit.

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