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參數資料
| 型號： | LA76070 |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP52 |
| 封裝： | SDIP-52 |
| 文件頁數： | 5/27頁 |
| 文件大小： | 308K |
| 代理商： | LA76070 |
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SIF Block (FM Block) - Input Signals and Measurement Conditions
Unless otherwise indicated, set up the following conditions for each of the following measurements.
1. Bus control condition: IF.AGC.DEF = 1
2. SW: IF1 = off
3. Apply the input signal to pin 49 and use a 4.5 MHz carrier signal.
Audio Block - Input Signals and Test Conditions
No. 5844-13/27
LA76070
Parameter
Symbol
Measurement
Input signal
Measurement procedure
Bus conditions
point
Adjust the DAC (FM.LEVEL) so that the pin 7
90 dB,
FM detector output 1kHz component is as
FM detector output voltage
SOADJ
fm = 1 kHz,
close to 474 mV rms as possible, and
FM = ±25 kHz measure the output at that time in mV rms.
Record this measurement as SV1.
fm = 1 kHz,
Determine the input level (in dB) such that
FM limiting sensitivity
SLS
FM = ±25 kHz
the pin 7 FM detector output 1kHz component
FM.LEVEL = adjusted value
is –3 dB down from the SV1 value
90 dB,
Determine the modulation frequency
FM detector output bandwidth
SF
FM = ±25 kHz
bandwidth (Hz) that is –3 dB or higher relative
FM.LEVEL = adjusted value
to the pin 7 FM detector output SV1 value
FM detector output total harmonic
90 dB,
Determine the total harmonic distortion in the
distortion
STHD
fm = 1 kHz,
pin 7 FM detector output 1kHz component
FM.LEVEL = adjusted value
FM = ±25 kHz
Measure the pin 7 FM detector output 1kHz
90 dB,
component (in mV rms).
AM rejection ratio
SAMR
fm = 1 kHz,
Record this measured value as SV2 and
FM.LEVEL = adjusted value
AM = 30%
perform the following calculation.
SAMR = 20
× log (SV1/SV2) [dB]
Set SW1:IF1 to the "ON"
90 dB,
Measure the pin 7 noise level (in mV rms).
SIF signal-to-noise ratio
SSN
CW
Record this measured value as SV3 and
FM.LEVEL = adjusted value
perform the following calculation.
SSN = 20
× log (SV1/SV3) [dB]
Parameter
Symbol
Measurement
Input signal
Measurement procedure
Bus conditions
point
Measure the output pin 1kHz component
Maximum gain
AGMAX
1 kHz, CW
(V1: mV rms) and perform the following
VOLUME = "111111"
400m Vrms
calculation.
AUDIO.MUTE = "0"
AGMAX = 20
× log (V1/400) [dB]
Measure the output pin 1kHz component
Variability range
ARANGE
1 kHz, CW
(V2: mV rms) and perform the following
VOLUME = "000001"
400m Vrms
calculation.
AUDIO.MUTE = "0"
AGMAX = 20
× log (V1/V2) [dB]
Measure the output pin 20kHz component
Frequency characteristics
AF
20 kHz, CW
(V3: mV rms) and perform the following
VOLUME = "111111"
400m Vrms
calculation.
AUDIO.MUTE = "0"
AF = 20
× log (V3/V1) [dB]
Measure the output pin 20kHz component
Muting
AMUTE
20 kHz, CW
(V4: mV rms) and perform the following
VOLUME = "000000"
400m Vrms
calculation.
AUDIO.MUTE = "0"
AMUTE = 20
× log (V3/V4) [dB]
Total harmonic distortion
ATHD
1 kHz, CW
Determine the total harmonic distortion in
VOLUME = "111111"
400m Vrms
output pin 1kHz component
AUDIO.MUTE = "0"
Measure the noise level (DIN.AUDIO) on
Signal-to-noise ratio
ASN
No signal
the output pin (V5: mV rms) and perform the
VOLUME = "111111"
following calculation.
AUDIO.MUTE = "0"
ASN = 20
× log (V1/V5) [dB]
7
51
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