ADAU1977WBCPZ-R7 datasheet(4/68 Pages) AD

4 / 68 page

ADAU1977

Data Sheet

Rev. C | Page 4 of 68

SPECIFICATIONS

Performance of all channels is identical, exclusive of the interchannel gain mismatch and interchannel phase deviation specifications.

AVDDx/IOVDD = 3.3 V; DVDD (internally generated) = 1.8 V; VBAT = 14.4 V; TA = −40°C to +105°C, unless otherwise noted; master

clock = 12.288 MHz (48 kHz fS, 256 × fS mode); input sample rate = 48 kHz; measurement bandwidth = 20 Hz to 20 kHz; word width =

24 bits; load capacitance (digital output) = 20 pF; load current (digital output) = ±1 mA; digital input voltage high = 2.0 V; digital input

voltage low = 0.8 V.

ANALOG PERFORMANCE SPECIFICATIONS

Table 1.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

LINE INPUT APPLICATION

See Figure 46

Full-Scale Differential Input Voltage

DC-coupled, VCM at AINxP/AINxN = 7 V

V rms

Full-Scale Single-Ended Input Voltage

DC-coupled, VCM at AINxP/AINxN = 7 V

V rms

MICROPHONE INPUT APPLICATION

See Figure 46, MICBIAS = 8.5 V

Differential Input Voltage

DC-coupled, VCM at AINxP = 5.66 V, AINxN = 2.83 V

V rms

QUASI DC INPUT

Single-Ended Input Voltage

V peak

Input Common-Mode Voltage

VCM at AINxP/AINxN pins

V dc

Peak Input Voltage

VCM + V ac peak at AINxP/AINxN pins

MICROPHONE BIAS

Output Voltage

Programmable from 5 V to 9 V in steps of 0.5 V; the

output voltage is within the specified load

regulation

Load Regulation

From no load to maximum load of 25 mA at 5 V

−1

+0.2

From no load to maximum load of 45 mA at 9 V

−1

+0.3

Output Current

At MICBIAS = 5 V

At MICBIAS = 9 V

Output Noise

20 Hz to 20 kHz, MICBIAS = 5 V

µV rms

20 Hz to 20 kHz, MICBIAS = 9 V

µV rms

Power Supply Rejection Ratio (PSRR)

350 mV rms, 1 kHz ripple on VBOOST_IN at 10 V

Interchannel Isolation at MICBIAS Pin

Referred to full scale at 1 kHz

Start-Up Time

With CLOAD = 1 nF

BOOST CONVERTER

Input Voltage

2.97

3.3

3.63

Input Current

L = 4.7 µH, fSW = 1.536 MHz, MICBIAS = 9 V at 45 mA load

195

L = 2.2 µH, fSW = 3.072 MHz, MICBIAS = 9 V at 45 mA load

220

Output Current

MICBIAS = 5 V

MICBIAS = 9 V

Load Regulation

From no load to maximum load of 50 mA at MICBIAS

= 5 V

−1

From no load to maximum load of 88 mA at MICBIAS

= 9 V

−1

Input Overcurrent Threshold

900

mA peak

Switching Frequency

fS = 48 kHz L = 2.2 µH

3.072

MHz

fS = 48 kHz, L = 4.7 µH

1.536

MHz

External Load Capacitor at VBOOST_OUT Pin

4.7

µF

ANALOG-TO-DIGITAL CONVERTERS

Input Resistance

Differential

Between AINxP and AINxN

kΩ

Single-Ended (Rin1977)

Between AINxP and AINxN

kΩ

ADC Resolution

Bits

Dynamic Range (A-Weighted)1

Input = 1 kHz, −60 dBFS

Line Input

Referred to full-scale differential input = 10 V rms

103

109

Microphone Input

Referred to full-scale differential input = 2 V rms

Total Harmonic Distortion Plus Noise

(THD + N)

Input = 1 kHz, −1 dBFS (0 dBFS = 10 V rms input)

−95

−89

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