The LA72910V is a FM modulation and demodulation single-chip IC. Its adjustment free modulation/demodulation
circuit significantly reduces the number of peripheral circuits required and can contribute to lower production costs.
Functions
•
Video signal FM modulation and demodulation
•
Video signal emphasis and de-emphasis function
•
Drop-Out detecting function of Video FM signal
•
FM mute function at Second-Call
Specifications
Maximum Ratings
at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Topr
Tstg
Ta
≤
70°C *
Conditions
Ratings
7.0
300
-30 to +70
-40 to +150
Unit
V
mW
°C
°C
When mounted on a 114.3mm
×
76.1mm
×
1.6mm, glass epoxy.
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Recommended Operating Conditions
at Ta = 25°C
Parameter
Recommended supply voltage
Allowable operating voltage range
Symbol
VCC
VCC op
Ta = -30 to +70°C
Conditions
Ratings
5.0
4.7 to 5.5
Unit
V
V
Semiconductor Components Industries, LLC, 2013
July, 2013
41907 MS PC 20070419-S00005 No.A0783-1/10
LA72910V
Electrical Characteristics
at Ta
=
25°C, VCC = 5V
DC CHARACTERISTICS
T6 = 0.4V, T9 = 2.0V, T10 = 0.4V
Parameter
Control terminal
(Pin6,9) Low level
Control terminal
(Pin6,9)High level
Input5 Low level
Input5 High level
Input10 Low level
Input10 High level
Output10 terminal
High level
Output10 terminal
Low level
Input12 Low level
Input12 High level
5pin AC input dynamic
range
16pin AC input
dynamic range
OPL13
OPL18
IN12L
IN12H
ACIN5
ACIN16
T12
T12
T5A
T16A
T12
T12
T3
T3
T10
Symbol
CNT6L
CNT9L
CNT6H
CNT9H
IN5L
IN5H
IN10L
IN10H
OPH10
In
T6
T9
T6
T9
T5
T5
T10
T10
T10
OUT
Conditions
Low level of control terminal of ALL mode.
T6 = 0.4V(DEMOD mode),
T9 = 0.4V (Standby mode)
High level of input terminal of ALL mode
T6 = 2.0V (MOD mode), T9 = 2.0V (Normal mode)
Low level of input terminal of MOD mode
T6 = 2.0V, T9 = 2.0V, T10 = 0.4V
High level of input terminal of MOD mode
T6 = 2.0V, T9 = 2.0V, T10 = 0.4V
Low level of input terminal of MOD mode
T5 = 0.4V, T6 = 2.0V, T9 = 2.0V
High level of input terminal of MOD mode
T5 = 0.4V, T6 = 2.0V, T9 = 2.0V
DEMOD mode: FM-Signal input
T6 = 0.4V, T9 = 2.0V, Pull-UP:15KΩ
T10: DEMOD mode: FM No-signal
Measure the sink level of output terminal.
T6 = 0.4V, T9 = 2.0V, Pull-UP:15KΩ
Voltage of terminal at AGC ON
T6 = 0.4V, T9 = 2.0V
Voltage of terminal at AGC OFF
T6 = 0.4V, T9 = 2.0V
Input amplitude level of FM signal
Freq: 11.5MHz to 13.5MHz
Maximum input level of T16A at Video signal
1.5
Vp-p
1000
mVp-p
4.5
5.0
V
0
3
V
0
0.25
0.4
V
4.7
V
2.0
5.0
V
0
0.4
V
2.0
5.0
V
0
0.4
V
2.0
5.0
V
Ratings
min
0
typ
max
0.4
Unit
V
Video FM Modulation Block (MOD)
T6=2.0V,T9=2.0V,T10=0.4V,T15=5V
Parameter
Current dissipation
FM modulator output
level
FM Mute output level
Carrier frequency
FM output Second
harmonic distortion
Deviation
FM modulator linearity
(11.5MHz to 13.5MHz)
DEV
LMOD
T16A
T16A
T3
T3
Symbol
ICCR
VFM1
VFM2
FFM
THD2
T3
T3
T3
T3
In
OUT
Conditions
measure the currents into pins 2 (MOD mode)
Measure the output level on T3 (No signal input)
It is load impedance 200Ω between T3-GND.
Measure the T3 output level with 2nd call
Measure the output frequency on T3
with no signal input
Measure the second harmonics distortion
with the above condition
With T16A 100% White 1Vp-p signal,
Measure the deviation on T3
Let f2.85, f3.35 and f3.85 be the output frequency
when 2.85V, 3.35V and 3.85V is applied to T16A
LMOD=
Emphasis gain
Main linear emphasis
characteristics(1)
Main linear emphasis
characteristics(2)
White clipping level
Dark clipping level
FM stop beginning
delay time
(VD characteristic 1B)
FM stop time
(VD characteristic2A)
Minimum VD pulse
width
VDT
T5
T3
C7=0.01μF, Minimum VD pulse width to which
TC1B is normally output
63
μsec
TC2
T5
T3
C8=0.001μF, Stop time of FM carrier of T3
30
40
50
μsec
LWC
LDC
TC1
T16A T12
T16A T12
T5
T3
GME2
T16A T12
GEMP
GME1
T16A T12
T16A T12
f3.35 - (f3.85 + f2.85) / 2
f3.85 – f2.85
×
100
-7.5
-1.5
2.5
180
-60
240
-6.0
0.0
4.0
200
-50
300
-4.5
+1.5
5.5
220
-40
360
dB
dB
dB
%
%
μsec
-2
0
+2
%
1.9
2.0
2.1
MHz
-30
-20
dB
0
10.9
10
11.5
20
12.1
mVp-p
MHz
Ratings
min
19.5
typ
23.0
1.8
max
26.5
2.2
Unit
mA
Vp-p
With VIN a 300mVp-p 10kHz sine wave,
Measure the ratio of the levels on T16A and T12
With VIN a 300mVp-p 500kHz sine wave,
Measure the ratio of the levels on T16A and T12
With VIN a 300mVp-p 2MHz sine wave,
Measure the ratio of the levels on T16A and T12
With VIN a 1.5Vp-p 100% white video signal.
Measure the white clipping level on T12
With VIN a 1.5Vp-p 100% white video signal.
Measure the dark clipping level on T12.
C7=0.01μF, Time from fall of T5 signal to doing of
stm32/stm8
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