Datasheet

ADAU1761
Rev. C | Page 4 of 92
SPECIFICATIONS
Supply voltage (AVDD) = 3.3 V, T
A
= 25°C, master clock = 12.288 MHz (48 kHz f
S
, 256 × f
S
mode), input sample rate = 48 kHz, measurement
bandwidth = 20 Hz to 20 kHz, word width = 24 bits, C
LOAD
(digital output) = 20 pF, I
LOAD
(digital output) = 2 mA, V
IH
= 2 V, V
IL
= 0.8 V,
unless otherwise noted. Performance of all channels is identical, exclusive of the interchannel gain mismatch and interchannel phase
deviation specifications.
ANALOG PERFORMANCE SPECIFICATIONS
Specifications guaranteed at 25°C (ambient).
Table 1.
Parameter Test Conditions/Comments Min Typ Max Unit
ANALOG-TO-DIGITAL CONVERTERS
ADC performance excludes mixers
and PGA
ADC Resolution All ADCs 24 Bits
Digital Attenuation Step 0.375 dB
Digital Attenuation Range 95 dB
INPUT RESISTANCE
Single-Ended Line Input −12 dB gain 83 kΩ
0 dB gain 21 kΩ
6 dB gain 10.5 kΩ
PGA Inverting Inputs −12 dB gain 84.5 kΩ
0 dB gain 53 kΩ
35.25 dB gain 2 kΩ
PGA Noninverting Inputs All gains 105 kΩ
SINGLE-ENDED LINE INPUT
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 20 Hz to 20 kHz, −60 dB input
With A-Weighted Filter (RMS) AVDD = 1.8 V 94 dB
AVDD = 3.3 V 99 dB
No Filter (RMS) AVDD = 1.8 V 91 dB
AVDD = 3.3 V 96 dB
Total Harmonic Distortion + Noise −1 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 94 dB
AVDD = 3.3 V 99 dB
No Filter (RMS) AVDD = 1.8 V 91 dB
AVDD = 3.3 V 96 dB
Gain per Step 3 dB
Total Gain Range −12 +6 dB
Mute Attenuation −87 dB
Interchannel Gain Mismatch 0.005 dB
Offset Error 0 mV
Gain Error −12 %
Interchannel Isolation 68 dB
Power Supply Rejection Ratio CM capacitor = 20 F
100 mV p-p @ 217 Hz 65 dB
100 mV p-p @ 1 kHz 67 dB