Data Sheet AD1974
Rev. D | Page 3 of 24
SPECIFICATIONS
TEST CONDITIONS
Performance of all channels is identical, exclusive of the interchannel gain mismatch and interchannel phase deviation specifications.
Supply Voltages (AVDD, DVDD) 3.3 V
Temperature Range
1
As specified in Table 1 and Table 2
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
Load Capacitance (Digital Output) 20 pF
Load Current (Digital Output) ±1 mA or 1.5 kΩ to ½ DVDD supply
Input Voltage High 2.0 V
Input Voltage Low 0.8 V
1
Functionally guaranteed at −40°C to +125°C case temperature.
ANALOG PERFORMANCE SPECIFICATIONS
Specifications guaranteed at 25°C (ambient).
Table 1.
Parameter Conditions Min Typ Max Unit
ANALOG-TO-DIGITAL CONVERTERS
ADC Resolution All ADCs 24 Bits
Full-Scale Input Voltage (Differential) 1.9 V rms
Dynamic Range 20 Hz to 20 kHz, −60 dB input
No Filter (RMS) 98 102 dB
With A-Weighted Filter (RMS) 100 105 dB
Total Harmonic Distortion + Noise (THD + N) −1 dBFS −96 −87 dB
Gain Error −10 +10 %
Interchannel Gain Mismatch
Offset Error −10 0 +10 mV
Gain Drift 100 ppm/°C
Interchannel Isolation −110 dB
CMRR 100 mV rms, 1 kHz 55 dB
100 mV rms, 20 kHz 55 dB
Input Resistance 14 kΩ
Input Capacitance 10 pF
Input Common-Mode Bias Voltage 1.5 V
REFERENCE
Internal Reference Voltage FILTR pin 1.50 V
External Reference Voltage FILTR pin 1.32 1.50 1.68 V
Common-Mode Reference Output CM pin 1.50 V
