Rainbow Electronics AT73C246 - Manual (Page 24)

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 - 10k Ω load - -88 -80 dB
20mW output - 32 Ω load - -65 -60 dB
20mW output - 16 Ω load - -60 -55 dB
P
O
Output Power
32 Ω load - THD < -40dB or 1% 30 mW
16 Ω load - THD < -40dB or 1% 50 mW
XTALK Left / Right Channel Separation (5)
10k Ω AC coupled load 90 dB
16 Ω DC coupled load 60 dB
G
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
V
FS
Full Scale Output Voltage (1)
AVDD /
3.3
V
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 - 10k Ω load - -88 -80 dB
20mW output - 32 Ω load - -65 -60 dB
20mW output - 16 Ω load - -60 -55 dB
P
O
Output Power
32 Ω load - THD < -40dB or 1% 30 mW
16 Ω load - THD < -40dB or 1% 50 mW
XTALK Left / Right Channel Separation (5)
10k Ω AC coupled load 90 dB
16 Ω DC coupled load 60 dB
G
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