LA76810A
Audio Block Input Signals and Test Conditions
Unless otherwise specified, the following conditions apply when each measurement is made.
1. Bus control condition:
AUDIO.MUTE = "0", AUDIO.SW = "1", VOL.FIL = "0", SIF.SYS = "01", IF.AGC.SW = "1"
2. Input 5.5MHz, 90dBµ and CW at pin 54.
3. Enter an input signal from pin 51.
Input signal
Symbol
Test point
Input signal
Test method
Maximum gain
Variable range
Frequency
characteristics
Mute
Distortion
S/N
Crosstalk
AGMAX
ARANGE
AF
AMUTE
ATHD
ASN
ACT
1kHz, CW
Measure the 1kHz component (V1: mVrms) at
1
500mVrms the pin 1 and calculate as follows:
AGMAX = 20*LOG (V1/500) [dB]
1kHz, CW
Measure the 1kHz component (V2: mVrms) at
1
500mVrms the pin 1 and calculate as follows:
ARANGE = 20*LOG (V1/V2) [dB]
20kHz, CW Measure the 20kHz component (V3: mVrms) at
1
500mVrms the pin 1 and calculate as follows:
AF = 20*LOG (V3/V1) [dB]
20kHz, CW Measure the 20kHz component (V4: mVrms) at
1
500mVrms the pin 1 and calculate as follows:
AMUTE = 20*LOG (V3/V4) [dB]
1
1kHz, CW
Measure the distortion of the 1kHz component at
500mVrms the pin 1.
No signal
Measure the noise level (DIN AUDIO, V5:
1
mVrms) at the pin 1 and calculate as follows:
ASN = 20*LOG (V1/V5) [dB]
20kHz, CW Measure the 20kHz component (V6: mVrms) at
1
500mVrms the pin 1 and calculate as follows:
ACT = 20*LOG (V3/V6) [dB]
Bus conditions
VOLUME = "1111111"
VOLUME = "0000000"
VOLUME = "1111111"
VOLUME = "1111111"
AUDIO.MUTE = ”1”
VOLUME = "1111111"
VOLUME = "1111111"
VOLUME = "1111111"
AUDIO.SW = "0"
NoA0252-11/40