STV0674 datasheet(21/35 Pages) STMICROELECTRONICS

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STV0674

Detailed Specifications

4.6

Audio

4.6.1

Audio ADC electrical parameters

4.6.2

Audio anti-aliasing filter characteristics

Table 5: Audio/ADC electrical characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Fclk

Clock frequency

MHz

Dutymclk

Clk duty cycle

Sample frequency

kHz

Vbias

Bias reference voltage

Vbias / Vcc = 3V

1.5

Rbias

Vbias impedance

Vbias

Ω

RIN

Input impedance

IN+ / IN-

Ω

Cin

Input capacitance

IN+ / IN-

Dyn In

Input dynamic range

ADC Out Full scale IN+ /

IN- Gain 0dB (AGC off)

1.5

Vpp

SNR*

Signal / Noise ratio

Sinewave @FS - 3dB

Gain 0dB

Offset

Offset error

After automatic

calibration

100

LSB

Harma

a. Input sine wave 1kHz, Fmclk 11.289 MHz, BW = 10Hz-20 kHz, A-weighting filters, output 16 bits RAW PCM

Signal to peak harmonics

Sinewave @FS - 3dB

Gain 0dB

Sinewave @FS - 3dB

Gain 24dB

PSRR

Power supply rejection

Measured on ADC output

with a 1kHz 100mVpp

sinewave added to the

3.3V supply

LSBpp

LFc

Low cut-off frequency

Gain 0dB

HFc

High cut-off frequency

ADC out

0.45

Table 6: Audio anti-aliasing filter characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Fpassband

Passband frequency

Fs is sampling frequency

0.45

Ripplepass

Passband ripple

0->0.376Fs

-0.25

0.25

Fstopband

Stopband frequency

Fs is sampling frequency

0.6

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