Datasheet

AD1938 Data Sheet
Rev. E | Page 4 of 32
Parameter Conditions Min Typ Max Unit
Interchannel Isolation 100 dB
Interchannel Phase Deviation 0 Degrees
Volume Control Step 0.375 dB
Volume Control Range 95 dB
De-emphasis Gain Error
±0.6
dB
Output Resistance at Each Pin 100 Ω
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
Specifications measured at a case temperature of 125°C.
Table 2.
Parameter Conditions Min Typ Max Unit
ANALOG-TO-DIGITAL CONVERTERS
ADC Resolution All ADCs 24 Bits
Dynamic Range 20 Hz to 20 kHz, −60 dB input
No Filter (RMS) 95 102 dB
With A-Weighted Filter (RMS) 97 105 dB
Total Harmonic Distortion + Noise −1 dBFS −96 −87 dB
Full-Scale Input Voltage (Differential) 1.9 V rms
Gain Error
−10
+10
%
Interchannel Gain Mismatch −0.25 +0.25 dB
Offset Error −10 0 +10 mV
DIGITAL-TO-ANALOG CONVERTERS
Dynamic Range 20 Hz to 20 kHz, −60 dB input
No Filter (RMS) 98 104 dB
With A-Weighted Filter (RMS) 100 106 dB
With A-Weighted Filter (Average) 108 dB
Total Harmonic Distortion + Noise 0 dBFS
Single-Ended Version Two channels running −92 dB
Single-Ended Version Eight channels running −86 −70 dB
Full-Scale Output Voltage 0.8775 (2.482) V rms (V p-p)
Gain Error −10 +10 %
Interchannel Gain Mismatch −0.2 +0.2 dB
Offset Error
−25
−4
25
mV
Gain Drift −30 30 ppm/°C
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
CRYSTAL OSCILLATOR SPECIFICATIONS
Table 3.
Parameter Min Typ Max Unit
Transconductance 3.5 mmhos