Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 24)

11050A–PMAAC–07-Apr-10

AT73C246

Notes: 1. Full Scale: A linear extrapolation to 0dBFS of the measured level at -10dBFS.

2. Signal-to-Noise Ratio: The ratio of the RMS value of a 997Hz full scale sine wave to the RMS value of output noise with no

signal applied. Device is not muted.

3. Dynamic Range: According to AES17-1991 (Audio Engineering Society) and EIAJ CP-307 (Electronic Industries Associa-

tion of Japan), an extrapolation to 0dBFS input signal of the THD+N ratio measurement at -60dBFS. As an example, if

THD+N @ -60dBFS = -36dB, then DR = 96dB.

4. Total Harmonic Distortion + Noise Ratio: The ratio of the RMS sum of the noise and the distortion components to the RMS

value of the signal.

5. XTALK: Attenuation measurement from one channel to the other one. Measurement is performed by stimulated one channel

with a 997Hz / -10dBFS sinewave and leaving the other channel unstimulated.

6. Mute Attenuation: Attenuation measurement of a -10dBFS / 997Hz input signal when concerned gain is set to mute.

THD Total Harmonic Distortion

0dBFs input - 10kΩ load - -88 -80 dB

20mW output - 32Ω load - -65 -60 dB

20mW output - 16Ω load - -60 -55 dB

Output Power

32Ω load - THD < -40dB or 1% 30 mW

16Ω load - THD < -40dB or 1% 50 mW

XTALK Left / Right Channel Separation

(5)

10kΩ AC coupled load 90 dB

16Ω DC coupled load 60 dB

BYP

Bypass Gain -1 0 +1 dB

Mute Attenuation

(6)

80 - - dB

Table 10-6. Analog Sidetone Path: Microphone Input to Headphone Output

Symbol Parameter Comments Min Typ Max Units

Full Scale Output Voltage

(1)

AVDD /

3.3

RMS

SNR Signal-to-Noise Ratio

(2)

AVDD = 3.3V 92 97 - dB

AVDD = 2.7V 89 94 - dB

DR Dynamic Range

(3)

AVDD = 3.3V 92 97 - dB

AVDD = 2.7V 89 94 - dB

THD Total Harmonic Distortion

0dBFs input - 10kΩ load - -88 -80 dB

20mW output - 32Ω load - -65 -60 dB

20mW output - 16Ω load - -60 -55 dB

Output Power

32Ω load - THD < -40dB or 1% 30 mW

16Ω load - THD < -40dB or 1% 50 mW

XTALK Left / Right Channel Separation

(5)

10kΩ AC coupled load 90 dB

16Ω DC coupled load 60 dB

SIDETONE

Programmable Gain Range -30 - 0 dB

Gain Steps 2.5 3 3.5 dB

Mute Attenuation

(6)

80 - - dB

Table 10-5. Analog Bypass Path: Line / Auxiliary Input to Headphone Output

Symbol Parameter Comments Min Typ Max Units

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 158 159

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