Datasheet

ADAU1381
Rev. B | Page 4 of 84
SPECIFICATIONS
Performance of all channels is identical, exclusive of the interchannel gain mismatch and interchannel phase deviation specifications.
Supply voltages AVDD = AVDD1 = AVDD2 = I/O supply = 3.3 V, digital supply = 1.5 V, unless otherwise noted; temperature = 25°C;
master clock (MCLK) = 12.288 MHz (f
S
= 48 kHz, 256 × f
S
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) = 2 mA; high level input voltage = 0.7 × IOVDD;
and low level input voltage = 0.3 × IOVDD. All power management registers are set to their default states.
RECORD SIDE PERFORMANCE SPECIFICATIONS
Specifications guaranteed at 25°C (ambient).
Table 1.
Parameter Test Conditions/Comments Min Typ Max Unit
ANALOG-TO-DIGITAL CONVERTERS
ADC Resolution All ADCs 24 Bits
Digital Attenuation Step 0.375 dB
Digital Attenuation Range 95 dB
INPUT RESISTANCE
Noninverting Inputs PGA
(LMICP, RMICP)
All gain settings 500 kΩ
Inverting Inputs PGA (LMICN, RMICN) 0 dB gain 62 kΩ
6 dB gain 32 kΩ
10 dB gain 22 kΩ
14 dB gain 14 kΩ
17 dB gain 10 kΩ
20 dB gain 8 kΩ
26 dB gain 5 kΩ
32 dB gain 4 kΩ
Beep Input PGA 0 dB 20 kΩ
6 dB 9 kΩ
10 dB 6 kΩ
14 dB 3.5 kΩ
−23 dB 50 kΩ
20 dB 2 kΩ
26 dB 2 kΩ
32 dB 2 kΩ
SINGLE-ENDED MICROPHONE INPUT
TO ADC PATH
Full-Scale Input Voltage (0 dB) Scales linearly with AVDD AVDD/3.3 V rms
AVDD = 1.8 V 0.55 (1.56) V rms (V p-p)
AVDD = 3.3 V 1.0 (2.83) V rms (V p-p)
Dynamic Range −60 dB input
With A-Weighted Filter (RMS) AVDD = 1.8 V 96 dB
AVDD = 3.3 V 94 99.2 dB
No Filter (RMS) AVDD = 1.8 V 92 dB
AVDD = 3.3 V 92 96.5 dB
Total Harmonic Distortion + Noise −3 dBFS
AVDD = 1.8 V −88 dB
AVDD = 3.3 V −90 dB
Signal-to-Noise Ratio
With A-Weighted Filter (RMS) AVDD = 1.8 V 96 dB
AVDD = 3.3 V 100 dB
No Filter (RMS) AVDD = 1.8 V 92 dB
AVDD = 3.3 V 97 dB