STV0674 Datasheet, PDF (21/35 Pages) STMicroelectronics – Tri-mode CMOS digital camera co-processor

STV0674
4.6 Audio
Detailed Specifications
4.6.1 Audio ADC electrical parameters
Table 5: Audio/ADC electrical characteristics
Symbol
Parameter
Test conditions
Min. Typ. Max. Unit
Fclk
Clock frequency
12
MHz
Dutymclk
Clk duty cycle
40
60
%
Fs
Sample frequency
8
48
kHz
Vbias
Bias reference voltage
Vbias / Vcc = 3V
1.5
V
Rbias
Vbias impedance
Vbias
5
kΩ
RIN
Input impedance
IN+ / IN-
50
kΩ
Cin
Input capacitance
IN+ / IN-
10
pF
Dyn In
Input dynamic range
ADC Out Full scale IN+ /
1.5
Vpp
IN- Gain 0dB (AGC off)
SNR*
Signal / Noise ratio
Sinewave @FS - 3dB
Gain 0dB
82
dB
Offset
Offset error
After automatic
calibration
100
LSB
Harm^a
Signal to peak harmonics Sinewave @FS - 3dB
75
dB
Gain 0dB
Sinewave @FS - 3dB
50
dB
Gain 24dB
PSRR
Power supply rejection
Measured on ADC output
40
LSBpp
with a 1kHz 100mVpp
sinewave added to the
3.3V supply
LFc
Low cut-off frequency
Gain 0dB
15
Hz
HFc
High cut-off frequency
ADC out
0.45
Fs
a. Input sine wave 1kHz, Fmclk 11.289 MHz, BW = 10Hz-20 kHz, A-weighting filters, output 16 bits RAW PCM
4.6.2 Audio anti-aliasing filter characteristics
Table 6: Audio anti-aliasing filter characteristics
Symbol
Fpassband
Ripplepass
Fstopband
Parameter
Passband frequency
Passband ripple
0->0.376Fs
Stopband frequency
Test conditions
Fs is sampling frequency
Min.
0.45
-0.25
Typ.
Fs is sampling frequency
Max.
0.25
0.6
Unit
Fs
dB
Fs
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