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参数资料
| 型号： | LA7688B |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP52 |
| 封装： | 0.600 INCH, DIP-52 |
| 文件页数： | 2/20页 |
| 文件大小： | 316K |
| 代理商： | LA7688B |
LA7688B
No.0077-10/20
Continued from preceding page.
Applied voltage (V)
Parameter
Symbol
Test
point
Input
symbol
Test method
TPO-2
TPZ-46
VCO1 control sensitivity
β1
TPO-8
No-signal
Connect a spectrum analyzer to TP0-8
and check to see that the VCO
oscillation frequency is 38.9MHz.
And then apply DC voltage to TPZ-3A
and vary it from 3.2V to 2.8V.
Assign the frequency range at that
moment to
f.
β =
mV
fkHz
400
VR center
[SIF block]
SIF limiting sensitivity
Vilim
TPO-52
SG1
fo = 5.5MHz
fm = 400Hz
FM :
f = ±30kHz
With the SG1 output level being
100dB
, measure the level at TP0-52
using an AC voltmeter.
And then lower the SG1 output level
and measure the SIF input level when
the reading on the AC voltmeter drops
3dB.
(AC voltmeter input resistance = 1M
)
VR center
7.8V
FM detection sensitivity
V52
TPO-52
Same as above
100dB
Measure the level at TP0-52 using an
AC voltmeter. (AC voltmeter input
resistance = 1M
)
VR center
7.8V
AM rejection ratio
AMR
TPO-52
SG1
fo = 5.5MHz
fm = 400Hz
AM = 30% MOD
100dB
Measure the level at TP0-52 using an
AC voltmeter and assign the measured
value to V52’.
(Input resistance=1MHz) AMR is
calculated relative to the VO1 value of
Test No.2 as shown below.
]
[
)
(
2
5
)
(
52
dB
mVrms
V
mVrms
V
AMR
′
=
VR center
7.8V
FM detection output
distortion
THD
TPO-52
SG1
fo = 5.5MHz
fm = 400Hz
FM :
f = ±30kHz
100dB
Measure the distortion at TP0-52 using
a distortion meter.
VR center
7.8V
SIF S/N
S/N
(SIF)
TPO-52
SG1
fo = 5.5MHz, cw
Measure the level at TP0-52 using an
AC voltmeter. Assign the measured
value to Vn.
(Use a filter of 20Hz to 20kHz.)
S/N = 20logV52/Vn (dB)
VR center
7.8V
FM detection range
WFM
TPO-52
SG1
fo = 5.5MHz,
f = ±3kHz
fm = 400Hz
Connect an oscilloscope to TP0-52 and
lower the SG1 frequency to measure
the lower pull-in characteristic.
Assign the measured value to fL.
In the same manner, raise the SG1
frequency to measure the upper pull-in
characteristic.
Assign the measured value to fU.
WFM : fL
≤4.0MHz
fU
≥7.0MHz
VR center
7.8V
FM detection output
variation
VO
TPO-52
SG1
fo = 5.5MHz,
f = ±30kHz
fm = 400Hz
Connect an AC voltmeter to TP0-52
and vary the SG1 frequency from
4.5MHz to 6.5MHz. Take Vo as the
reading on the AC voltmeter.
VO : -1.5dB≤Vo≤1.5dB
VR center
7.8V
Continued on next page.
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