Datasheet

ADAU1772 Data Sheet
Rev. B | Page 4 of 116
SPECIFICATIONS
Master clock = core clock = 12.288 MHz, serial input sample rate = 48 kHz, measurement bandwidth = 20 Hz to 20 kHz, word width =
24 bits, ambient temperature = 25°C, outputs line loaded with 10 kΩ.
ANALOG PERFORMANCE SPECIFICATIONS
Supply voltages AVDD = IOVDD = 1.8 V, DVDD = 1.1 V, unless otherwise noted. PLL disabled, direct master clock.
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 Gain settings do not include 10 dB gain from
PGA_x_BOOST settings; this additional gain does
not affect input impedance; PGA_POP_DISx = 1
Single-Ended Line Input
0 dB gain
14.3
kΩ
PGA Inputs −12 dB gain 32.0 kΩ
0 dB gain 20 kΩ
+35.25 dB gain 0.68 kΩ
SINGLE-ENDED LINE INPUT PGA_ENx = 0, PGA_x_BOOST = 0, PGA_POP_DISx = 1
Full-Scale Input Voltage Scales linearly with AVDD AVDD/3.63 V rms
AVDD = 1.8 V 0.49 V rms
AVDD = 1.8 V, 0 dBFS 1.38 V p-p
AVDD = 3.3 V 0.90 V rms
AVDD = 3.3 V, 0 dBFS
2.54
V p-p
Dynamic Range
1
20 Hz to 20 kHz, −60 dB input
With A-Weighted Filter (RMS) AVDD = 1.8 V 97 dB
AVDD = 3.3 V 102 dB
With Flat 20 Hz to 20 kHz Filter AVDD = 1.8 V 94 dB
AVDD = 3.3 V 99 dB
Signal-to-Noise Ratio (SNR)
2
With A-Weighted Filter (RMS) AVDD = 1.8 V 98 dB
AVDD = 3.3 V 103 dB
With Flat 20 Hz to 20 kHz Filter AVDD = 1.8 V 96 dB
AVDD = 3.3 V 100 dB
Interchannel Gain Mismatch 40 mdB
Total Harmonic Distortion + Noise (THD + N) 20 Hz to 20 kHz, −1 dBFS
AVDD = 1.8 V
−90
dB
AVDD = 3.3 V −94 dB
Offset Error ±0.1 mV
Gain Error ±0.2 dB
Interchannel Isolation CM capacitor = 22 μF 100 dB
Power Supply Rejection Ratio CM capacitor = 22 μF
100 mV p-p at 1 kHz 55 dB
SINGLE-ENDED PGA INPUT PGA_ENx = 1, PGA_x_BOOST = 0
Full-Scale Input Voltage Scales linearly with AVDD AVDD/3.63 V rms
AVDD = 1.8 V
0.49
V rms
AVDD = 1.8 V, 0 dBFS 1.38 V p-p
AVDD = 3.3 V 0.90 V rms
AVDD = 3.3 V, 0 dBFS 2.54 V p-p
Dynamic Range
1
20 Hz to 20 kHz, −60 dB input
With A-Weighted Filter (RMS) AVDD = 1.8 V 96 dB
AVDD = 3.3 V 102 dB
With Flat 20 Hz to 20 kHz Filter AVDD = 1.8 V 94 dB
AVDD = 3.3 V 99 dB