Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 22)

11050A–PMAAC–07-Apr-10

AT73C246

10. Audio Codec Electrical Characteristics

Unless otherwise specified: AVDD = 3.3V, T

= 25C, MCLK = 12.288MHz, F

= 48kHz. Master mode and 24-bit operation

on I

S port. All gains set to 0dB, audio effects are off. Noise measurements are made in the [20Hz-20kHz] band using the

A-Weighting filter. Distortion measurements are made from the 2

to the 5

harmonic products of a 997Hz input sinewave.

Input sources have an internal impedance of 50 Ohms. Audio Path without mixing capability.

Table 10-1. Audio Codec Bias

Symbol Parameter Comments Min Typ Max Units

AVDD Operating Supply Voltage 2.7 3.3 3.6 V

Supply Current

OFF 20 µA

STANDBY 1 mA

MID

Mid-Supply Reference Voltage -1%

AVDD /

+1% V

MID_ON

Time to charge V

MID

capacitor From 0 to 95% of final value 350 ms/μF

MID_OFF

Time to discharge V

MID

capacitor From 0 to 95% of final value 700 ms/μF

MICBIAS

Microphone Bias Reference

Voltage

No load. AVDD V

MICBIAS

Microphone Bias Reference

Voltage Internal Resistance

1.5 1.9 2.3 kΩ

Table 10-2. Line Record Path: Line or Auxiliary Input to ADC Output

Symbol Parameter Comments Min Typ Max Units

Full Scale Input Voltage

(1)

Corresponds to 0dBFs digital

output signal.

AVDD /

3.3

RMS

SNR Signal-to-Noise Ratio

(2)

AVDD = 3.3V 85 96 - dB

AVDD = 2.7V 82 93 - dB

DR Dynamic Range

(3)

AVDD = 3.3V 85 96 - dB

AVDD = 2.7V 82 93 - dB

THD Total Harmonic Distortion -1dBFS digital output - -80 -74 dB

XTALK Left / Right Channel separation

(5)

80 90 - dB

LINE

Programmable Gain Range -34 0 12 dB

Gain Step Size - 1 - dB

Mute Attenuation

(6)

80 - - dB

Input Resistance 5.9 7 8.1 kΩ

Input Capacitance - - 10 pF

Table 10-3. Microphone Record Path: Microphone Input to ADC Output

Symbol Parameter Comments Min Typ Max Units

Full Scale Input Voltage

(1)

Corresponds to 0dBFs digital

output signal.

AVDD /

3.3

RMS

SNR Signal-to-Noise Ratio

(2)

AVDD = 3.3V 85 96 - dB

AVDD = 2.7V 82 93 - dB

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 158 159

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