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参数资料
| 型号： | LA72912V |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封装： | 0.275 INCH, SSOP-24 |
| 文件页数： | 6/12页 |
| 文件大小： | 190K |
| 代理商： | LA72912V |
LA72912V
No.A1409-3/12
Video FM De-modulation Block (DEMOD) T6=0.4V,T17=2.0V
Ratings
Parameter
Symbol
In
OUT
Conditions
min
typ
max
Unit
Current dissipation
ICCP
Measure the currents into pin 2 (DEMOD mode)
26.0
32.0
38.0
mA
Video output level
VOUT
T5A
T3
Demodulation level, when the FM signal of 2.2MHz
deviation. Load impedance = 1k
T3-GND.
2.09
2.2
2.31
Vp-p
Video output level B
VOUTB
T5A
T3
Demodulation level, when the FM signal of 2.0MHz
deviation. Load impedance = 1k
T3-GND.
(In this case only, VCC make 4.5V to 5.5V.)
1.9
2.0
2.1
Vp-p
FM stop detection level
(DOC characteristic 1)
DOC1
T5A
T20
T18
T20
T5 = 11.5MHz, 300mVp-p. Measure T20 voltage
(V20). Set T20 V20 (AGC-Fix). T5 input level
when T5 amplitude is decrease gradually, and
T18 becomes "Low"
40
60
mVp-p
(Drop Delay Down)
DDD
T5A
T20
T18
T20
Shift time from T5 = 300mVp-p → 0mVp-p to
T18 ”Low”.
0.5
1.5
2.5
s
FM return judgment
level
DOC2
T5A
T20
T18
T20
T5 = 11.5MHz, 300mVp-p, Measure T20 Voltage
(V20). Set T20 V20 (AGC-Fix). T5 inputs the level
when T5 amplitude is increase gradually, and T18
becomes "High"
60
90
mVp-p
Video DC level when
returning
DOC2B
T5A
T20
T23
Confirmation of output of Video signal from T3.
Measurement of DC level.
0.5
1.0
1.5
V
(Drop Delay Rise)
Return operation delay
time
DWR
T5A
T20
T18
T20
Shift time from T5 = 0mVp-p
→3 00mVp-p to
T18 ”High”
0.2
1.5
2.5
sec
4V Regulator
VREG
T4
Measurement of T4 DC level.
3.9
4.0
4.3
V
Range of input
Dynamic range
ACIN5
T5A
T3
DEV = 2.0MHz. Input amplitude level of FM
signal. (T5A: 11.5MHz to 13.5MHz)
500
1000
mVp-p
DG
T5A
T3
0
6
10
%
DP
T5A
T3
0
6
10
deg
Output voltage at mute
MUV
T3
Mute level measurement of T3
0
10
20
IRE
FM demodulation
voltage
(11.0M)
VDEM11
VDEM12
VDEM13
T5A
T23
T5A = 11.0MHz, 100mVp-p, 200mVp-p and
400mVp-p.
Each T23 voltage measurement
0.3
0.8
1.3
V
FM demodulation
voltage
(12.5M)
VDEM21
VDEM22
VDEM23
T5A
T23
T5A = 12.5MHz, 100mVp-p, 200mVp-p and
400mVp-p.
Each T23 voltage measurement
0.7
1.2
1.7
V
FM demodulation
voltage
(14.0M)
VDEM31
VDEM32
VDEM33
T5A
T23
T5A = 14MHz, 100mVp-p, 200mVp-p and
400mVp-p
Each T23 voltage measurement
1.1
1.6
2.1
V
FM demodulation
linearity1,2,3
LDEM1
LDEM2
LDEM3
Calculate FM demodulation linearity
LDEM1 = {[VDEM21 - (VDEM11 + VDEM31) / 2]
/ (VDEM31 - VDEM11)}
×100
LDEM2 = {[VDEM22 - (VDEM12 + VDEM32) /2 ]
/ (VDEM32 - VDEM12)}
×100
LDEM3 = {[VDEM23 - (VDEM13 + VDEM33) / 2]
/ (VDEM33 - VDEM13)}
×100
-2
0
+2
%
FM demodulation
Sensitivity1,2,3
SDEM1
SDEM2
SDEM3
Calculate FM recovery Sensitivity with consider
pin 3 output level conversion ratio.
SDEM1 = (VDEM31-VDEM11)/3.0
SDEM2 = (VDEM32-VDEM12)/3.0
SDEM3 = (VDEM33-VDEM13)/3.0
0.28
0.33
0.38
V/MHz
Main linear de-emphasis
amplitude
GMED
T5A
T23
T5 = 200mVp-p FM signal
(fm = 10kHz, Center Carrier = 12.5MHz,
DEV = 2.0MHz) Signal level of T23
481
535
589
mVp-p
Main linear
de-emphasis
Characteristics(1)
GMED1
T5A
T23
T5 = 200mVp-p FM signal (fm = 500kHz, Center
Carrier = 12.5MHz, DEV = 2.0MHz). Signal level
of T23 versus GMRD (Ratio of GMED).
-3.5
-1.5
+0.5
dB
Main linear
de-emphasis
Characteristics(2)
GMED2
T5A
T23
T5 = 200mVp-p FM signal (fm = 2MHz, Center
Carrier = 9.25MHz, DEV = 2.0MHz). Signal level
of T23 versus GMRD (Ratio of GMED)
-6.5
-4.5
-2.5
dB
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