LA72912V Datasheet, PDF (3/12 Pages) Sanyo Semicon Device – FM Modulator and Demodulator IC

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