Datasheet

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SLAS412− DECEMBER 2003
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4
ELECTRICAL CHARACTERISTICS
At +25°C, AVDD,DRVDD,IOVDD = 3.3 V, DVDD = 1.8 V, Int. V
ref
= 2.5 V, Fs (Audio) = 48 kHz, unless otherwise noted
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
BATTERY MONITOR INPUTS
Input voltage range 0.5 6.0 V
Input leakage current Battery conversion not selected ±1 µA
AUXILIARY A/D CONVERTER
Resolution Programmable: 8-, 10-,12-bits 12 Bits
No missing codes 12-bit resolution 11 Bits
Integral nonlinearity −5 5 LSB
Offset error −6 6 LSB
Gain error
Calculated with effect of internal reference
variation removed.
−6 6 LSB
Noise 53 µVrms
AUDIO CODEC
ADC DECIMATION FILTER Sample rate of 48 ksps
Filter gain from 0 to 0.39Fs ±0.1 dB
Filter gain at 0.4125Fs −0.25 dB
Filter gain at 0.45Fs −3 dB
Filter gain at 0.5Fs −17.5 dB
Filter gain from 0.55Fs to 64Fs −75 dB
Filter group delay 17/Fs sec
MICROPHONE INPUT TO ADC 1 kHz sine wave input, Fs = 48 ksps
Full scale input voltage (0 dB) By design, not tested in production 0.707 Vrms
Input common mode By design, not tested in production 1.35 V
SNR
Measured as idle channel noise, 0-dB gain,
A-weighted
80 92 dBA
THD 0.63-Vrms input, 0-dB gain −89 −72 dB
PSRR 1 kHz, 100 mVpp on AVDD.
(1)
57 dB
Mute attenuation Output code with 0.63-Vrms sine wave input at
1 kHz
0000H
Input resistance 20 kΩ
Input capacitance 10 pF
MICROPHONE BIAS
Voltage D4 = 0 control register 05H/Page2 2.5 V
Voltage
D4 = 1 control register 05H/Page2 2.0 V
Sourcing current 4.7 mA
(1)
ADC PSRR measurement is calculated as:
PSRR + 20 log
10
ǒ
VSIG
sup
V
ADCOUT
Ǔ