Ordering number : ENA0783
LA72910V
Monolithic Linear IC
FM Modulator and
Demodulator IC
http://onsemi.com
Overview
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
Symbol
Conditions
Ratings
Unit
VCC max
7.0
V
Pd max
300
mW
Operating temperature
Topr
Storage temperature
Tstg
Ta ≤ 70°C *
-30 to +70
°C
-40 to +150
°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
Conditions
VCC
VCC op
Semiconductor Components Industries, LLC, 2013
July, 2013
Ta = -30 to +70°C
Ratings
Unit
5.0
V
4.7 to 5.5
V
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
OUT
Ratings
Symbol
In
Conditions
Control terminal
CNT6L
T6
Low level of control terminal of ALL mode.
(Pin6,9) Low level
CNT9L
T9
T6 = 0.4V(DEMOD mode),
Control terminal
CNT6H
T6
High level of input terminal of ALL mode
(Pin6,9)High level
CNT9H
T9
T6 = 2.0V (MOD mode), T9 = 2.0V (Normal mode)
IN5L
T5
Low level of input terminal of MOD mode
min
typ
Unit
max
0
0.4
V
2.0
5.0
V
0
0.4
V
2.0
5.0
V
0
0.4
V
2.0
5.0
V
T9 = 0.4V (Standby mode)
Input5 Low level
T6 = 2.0V, T9 = 2.0V, T10 = 0.4V
Input5 High level
IN5H
T5
High level of input terminal of MOD mode
T6 = 2.0V, T9 = 2.0V, T10 = 0.4V
Input10 Low level
IN10L
T10
Low level of input terminal of MOD mode
T5 = 0.4V, T6 = 2.0V, T9 = 2.0V
Input10 High level
IN10H
T10
High level of input terminal of MOD mode
T5 = 0.4V, T6 = 2.0V, T9 = 2.0V
Output10 terminal
OPH10
T10
High level
DEMOD mode: FM-Signal input
4.7
V
T6 = 0.4V, T9 = 2.0V, Pull-UP:15KΩ
Output10 terminal
OPL13
Low level
OPL18
Input12 Low level
IN12L
T10
T10: DEMOD mode: FM No-signal
0
0.25
0.4
V
0
3
V
4.5
5.0
V
Measure the sink level of output terminal.
T6 = 0.4V, T9 = 2.0V, Pull-UP:15KΩ
T12
T12
Voltage of terminal at AGC ON
T6 = 0.4V, T9 = 2.0V
Input12 High level
IN12H
T12
T12
Voltage of terminal at AGC OFF
T6 = 0.4V, T9 = 2.0V
5pin AC input dynamic
range
ACIN5
16pin AC input
ACIN16
T5A
T3
Input amplitude level of FM signal
1000
mVp-p
Freq: 11.5MHz to 13.5MHz
T16A
T3
Maximum input level of T16A at Video signal
1.5
Vp-p
dynamic range
Video FM Modulation Block (MOD) T6=2.0V,T9=2.0V,T10=0.4V,T15=5V
Parameter
Symbol
In
OUT
Ratings
Conditions
Current dissipation
ICCR
FM modulator output
level
VFM1
T3
FM Mute output level
VFM2
T3
Measure the T3 output level with 2nd call
FFM
T3
Measure the output frequency on T3
Carrier frequency
measure the currents into pins 2 (MOD mode)
min
19.5
Measure the output level on T3 (No signal input)
Unit
typ
23.0
max
26.5
1.8
2.2
Vp-p
mVp-p
mA
It is load impedance 200Ω between T3-GND.
0
10
20
10.9
11.5
12.1
MHz
-30
-20
dB
1.9
2.0
2.1
MHz
-2
0
+2
%
with no signal input
FM output Second
THD2
T3
harmonic distortion
Deviation
Measure the second harmonics distortion
with the above condition
DEV
T16A
T3
With T16A 100% White 1Vp-p signal,
Measure the deviation on T3
FM modulator linearity
LMOD
T16A
T3
(11.5MHz to 13.5MHz)
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=
f3.35 - (f3.85 + f2.85) / 2
f3.85 – f2.85
× 100
Emphasis gain
GEMP
T16A T12
With VIN a 300mVp-p 10kHz sine wave,
Measure the ratio of the levels on T16A and T12
-7.5
-6.0
-4.5
dB
Main linear emphasis
GME1
T16A T12
With VIN a 300mVp-p 500kHz sine wave,
Measure the ratio of the levels on T16A and T12
-1.5
0.0
+1.5
dB
GME2
T16A T12
With VIN a 300mVp-p 2MHz sine wave,
Measure the ratio of the levels on T16A and T12
2.5
4.0
5.5
dB
White clipping level
LWC
T16A T12
With VIN a 1.5Vp-p 100% white video signal.
Measure the white clipping level on T12
180
200
220
%
Dark clipping level
LDC
T16A T12
With VIN a 1.5Vp-p 100% white video signal.
Measure the dark clipping level on T12.
-60
-50
-40
%
FM stop beginning
delay time
TC1
T5
T3
C7=0.01μF, Time from fall of T5 signal to doing of
FM carrier of T3 STOP
240
300
360
μsec
TC2
T5
T3
C8=0.001μF, Stop time of FM carrier of T3
30
40
50
μsec
VDT
T5
T3
C7=0.01μF, Minimum VD pulse width to which
TC1B is normally output
63
characteristics(1)
Main linear emphasis
characteristics(2)
(VD characteristic 1B)
FM stop time
(VD characteristic2A)
Minimum VD pulse
width
μsec
No.A0783-2/10
LA72910V
Video FM De-modulation Block (DEMOD) T6=0.4V,T9=2.0V
Parameter
Symbol
In
OUT
Conditions
typ
28.0
max
32.0
Unit
Current dissipation
ICCP
Video output level
VOUT
T5A
T3
Demodulation level, when the FM signal of
2.2MHz deviation. Load impedance = 1kΩ
T3-GND.
2.09
2.2
2.31
Vpp
VOUTB
T5A
T3
Demodulation level, when the FM signal of
2.0MHz deviation. Load impedance = 1kΩ
T3-GND.
1.9
2.0
2.1
Vpp
DOC1
T5A
T10
40
60
mVp-p
T12
T12
T5A
T10
1.5
2.5
μsec
T12
T12
T5A
T10
60
90
mVp-p
T12
T12
T5A
T15
0.5
1.0
1.5
V
Shift time from T5 = 0mVp-p→300mVp-p to
T10”High”
0.2
1.5
2.5
μsec
T4
Measurement of T4 DC level.
3.9
T3
DEV = 2.0MHz. Input amplitude level of FM
signal. (T5A: 11.5MHz to 13.5MHz)
Video output level B
FM stop detection level
(DOC characteristic 1)
(Drop Delay Down)
DDD
FM return judgment
level
DOC2
Video DC level when
returning
DOC2B
(Drop Delay Rise)
Measure the currents into pin 2 (DEMOD mode)
Ratings
min
24.0
T12
DWR
Return operation delay
time
In this case only, VCC make 4.5V to 5.5V.
T5 = 11.5MHz, 300mVp-p. Measure T12 voltage
(V12). Set T12 V12 (AGC-Fix). T5 input level
when T5 amplitude is decrease gradually, and
T10 becomes "Low"
Shift time from T5=300mVp-p→0mVp-p to
T10”Low”.
0.5
T5=11.5MHz, 300mVpp, Measure T12 Voltage
(V12). Set T12 V12 (AGC-Fix). T5 inputs the level
when T5 amplitude is increase gradually, and T10
becomes "High"
Confirmation of output of Video signal from T3.
mA
Measurement of DC level.
T5A
T10
T12
T12
4V Regulator
VREG
Range of input
ACIN5
T5A
DG
DG
T5A
T3
0
6
10
%
DP
DP
T5A
T3
0
6
10
deg
T3
Mute level measurement of T3
T5A
T15
T5A = 11MHz, 100mVp-p, 200mVp-p and
400mVp-p.
T5A
T15
T5A
T15
Dynamic range
Output voltage at mute
FM demodulation
voltage
MUV
VDEM11
VDEM12
(11.0M)
VDEM13
FM demodulation
voltage
VDEM21
4.0
4.3
500
1000
V
mVp-p
0
10
20
IRE
0.3
0.8
1.3
V
0.7
1.2
1.7
V
1.1
1.6
2.1
V
-2
0
+2
%
0.28
0.33
0.38
V/MHz
243
270
297
mVp-p
Each T15 voltage measurement
VDEM22
T5A = 12.5MHz, 100mVp-p, 200mVp-p and
400mVp-p.
(12.5M)
VDEM23
FM demodulation
voltage
VDEM31
Each T15 voltage measurement
VDEM32
T5A = 14MHz, 100mVp-p, 200mVp-p and
400mVp-p
(14.0M)
VDEM33
Each T15 voltage measurement
FM demodulation
linearity1.2.3
LDEM1
Calculate FM demodulation linearity
LDEM2
LDEM1 = {[VDEM21 - (VDEM11 + VDEM31) / 2]
LDEM3
/ (VDEM31 - VDEM11)}×100
LDEM2 = {[VDEM22 - (VDEM12 + VDEM32) /2 ]
/ (VDEM32 - VDEM12)}×100
LDEM3 = {[VDEM23 - (VDEM13 + VDEM33) / 2]
/ (VDEM33 - VDEM13)}×100
FM demodulation
Sensitivity1.2.3
SDEM1
SDEM2
Calculate FM recovery Sensitivity with consider
pin3 output level conversion ratio.
SDEM3
SDEM1 = (VDEM31-VDEM11)/2.5
SDEM2 = (VDEM32-VDEM12)/2.5
SDEM3 = (VDEM33-VDEM13)/2.5
Main linear
de-emphasis
GMED
T5A
T15
amplitude
Main linear
de-emphasis
DEV = 1.0MHz) Signal level of T15
GMED1
T5A
T15
T5 = 200mVp-p FM signal (fm = 500kHz, Center
Carrier = 12.5MHz, DEV = 1.5MHz). Signal level
of T15 versus GMRD (Ratio of GMED).
-8.0
-6.0
-4.0
dB
GMED2
T5A
T15
T5 = 200mVp-p FM signal (fm = 2MHz, Center
Carrier = 9.25MHz, DEV = 1.5MHz). Signal level
of T15 versus GMRD (Ratio of GMED)
-11.0
-9.0
-7.0
dB
Characteristics(1)
Main linear
de-emphasis
Characteristics(2)
T5=200mVp-p FM signal
(fm = 10kHz,Center Carrier = 12.5MHz,
No.A0783-3/10
LA72910V
Standby (Standby mode) T9=0.4V
Parameter
Symbol
In
OUT
Current dissipation at
standby
ICCS
T9
Standby release time(1)
(FM stop→release)
SASK1
T6
T9
Standby release time(2)
(Video signal stop
→release)
SASK2
T6
T5A
T9
Ratings
Conditions
min
typ
max
Unit
Measure the currents into pin 2. (Standby mode)
5.0
8.0
11.0
mA
T3
T6 = 2.0VDC T9 = 0V→2V (Standby release)
Time until FM career is output to T3.
0.0
1.0
2.0
usec
T3
T6 = 0.4V, T5 = DEV = 1.5MHz 100% white
video signal of FM signal.
T9 = 0V→2V (Standby release), Time until white
100% signal is output to T3
2.0
7.0
12.0
usec
Package Dimensions
unit : mm (typ)
3178B
5.2
0.5
6.4
9
4.4
16
1
8
0.65
0.15
0.22
0.1
(1.3)
1.5max
(0.33)
SANYO : SSOP16(225mil)
Pin Assignment
Emphasis filter 1
16 Video_IN
VCC(5V) 2
15
Main_OUT 3
VD control/
De-emphasis out
14 A_GND
Regulator
filter 4
De-emphasis
filter
Emphasis Monitor
12 /FM-AGC filter
13
VD_IN
5
/FM_IN
Mode control
6
(mod/de-mod)
11 B_GND
Drop Delay
7
(TC1)
10
FM-DOC_OUT
/2nd-Call_IN
Drop Width
8
(TC2)
9
Stand-by
control
Top view
No.A0783-4/10
LA72910V
Block Diagram and Application Circuit Exanple1 Modulation (Camera)
2nd-Call
(Push switch)
MOD : DFF_SW
2V : DFF_ON
0V : DFF_OFF
Video-IN
(1Vp-p)
Standby SW
Main
Emphasis
Monitor
(Low : FM-OFF)
(High : FM-ON)
10μF
A-GND
B-GND
+
16
15
12
13
14
Main De-enphasis
Clamp
11
10
9
Standby
Control
DO-DET
FM-AGC-DET
(DO-LOW)
(Low : FM-OFF)
FM-DEMOD/LPF
D-LIM
LPF/FM-AGC
Main Emphasis
FM-MOD LPF
12dB-AMP
Video-Mute
FM-Stop control
FM-stop
DFF-SW
MOD/DEMOD
Control
REG
VD-IN
MOD mode
TC2
7
8
0.01μF
FM-OUT
6
0.01μF
180pF 470Ω
VCC(5V)
TC1
5
4
3
0.1μF
A-VCC
2
1
1000pF
-6dB
(Negative pulse) (MOD : Hogh)
Pin 10 : Open collector output
Pin 3 : Push-pull output
Application Circuit Exanple2 Demodulation (Monitor)
16
15
15kΩ
DO-OUT
B-GND
12
13
14
Main De-enphasis
Clamp
1μF
+
A-GND
1.8kΩ
1μF
100pF
FM-AGC Off
(Off : 4.5V)
11
FM-AGC-DET
10
DO-DET
(DO-LOW)
Standby SW
(Low : FM-OFF)
(High : FM-ON)
9
Standby
Control
(Low : FM-OFF)
-6dB
FM-DEMOD/LPF
D-LIM
LPF/FM-AGC
Main Emphasis
FM-MOD LPF
12dB-AMP
Video-Mute
FM-Stop control
FM-stop
DFF-SW
MOD/DEMOD
Control
REG
VCC(5V)
TC1
Video-OUT
(2Vp-p)
5
4
3
6
0.01μF
A-VCC
2
0.1μF
1
7
TC2
8
Pin 10 : Open collector output
Pin 3 : Push-pull output
FM-IN DEMOD mode
(DEMOD : Low)
No.A0783-5/10
LA72910V
Pin Function
Pin No.
FM MOD mode(Outside camera)
FM DEMOD mode(Inside Monitor)
Note
1
Emphasis filter
Emphasis filter connection pin
Non connect(Hi-Z)
If you don’t need, this pin is open.
2
VCC5V
VCC for FM modulation.
VCC for FM demodulation.
3
Main_OUT
4
5
6
Pin name
Regulator filter
VD_IN/FM_IN
Mode control
FM Output
Video Output
(Ro=200Ω:1.8Vp-p)
(Ro=1kΩ:2Vp-p)
Push-pull output
FM modulation block reference
FM demodulation block reference
DC power supply.
DC power supply.
VD Input
FM Input
DEMOD mode:Set
(Hi: over 2V, Low: under 0.4V)
(Recommend Level: 100 to
3.3V by internal bias.
(VD DET: High)
620mVp-p)
(34kΩ/66kΩ)
Set over 2V DC voltage.
Set under 0.4V DC voltage.
Outside camera /
Inside monitor setting.
7
Drop delay
Connect TC1 setting C.
Non connect(Hi-Z)
Connect TC2 setting C.
Non connect(Hi-Z)
FM blocks standby control.
←
(TC1)
8
Drop Width
(TC2)
9
Stand-by control
(FM block operate: over 2V ,
FM block standby: under 0.4V )
10
11
12
FM-DOC-OUT
2nd-Call input, 2nd-Call: Low
DOC output
DEMOD mode:
/2nd-Call control
(High: over 2V, Low: under 0.4V)
(When DO-DET, output is Low)
Open collector output.
B-GND
Circuit GND
←
Emphasis Monitor
Emphasis monitor output
FM AGC control filter (AGC-ON: 0 to
MOD mode: Don’t connect
3V DC, AGC-OFF: 4.5V to 5V by
capacitor.
/FM-AGC filter
external DC voltage.)
13
De-emphasis filter
Non connect(Hi-Z)
De-emphasis filter connection pin.
14
A-GND
Circuit GND
←
DE-emphasis output
15
16
If you don’t need, this pin is open.
VD control
DFF control
/De-emphasis out
(ON: over 2V, OFF: under 0.4V)
Video_IN
Video signal input (from outside CCD
Video signal input (from
MOD mode: Maximum video input
camera: 1Vp-p).
de-emphasis block: 0.5Vp-p).
level is 1.5Vp-p.
No.A0783-6/10
LA72910V
Pin Description
Pin No.
1
Pin Name
Emphasis filter
Description
Equivalent circuit
Main Emphasis filter pin.
Before FM Modulation, make emphasis characteristic at
video signal.
Emphasis time constant must be matching at
de-emphasis time constant.
2.7kΩ
(If you don’t need the emphasis, this pin is open.)
620Ω
1
C1
2
VCC5V
3
Main_OUT
1kΩ
200Ω
R1
VCC pin. Supply voltage is 5V DC.
Please connect de-coupling capacitor.
Push-Pull output pin.
MOD mode: FM carrier output. (1.8Vp-p: Rout=200Ω)
DEMOD mode: Video signal output. (2.0Vp-p: Rout=1kΩ)
40Ω
MOD
3
4
Regulator filter
40Ω
DEMOD
Internal regulator filter pin.
Please connect 0.1μF (C1)
C1
5
VD_IN/FM_IN
50kΩ
10kΩ 23kΩ
4
DEMOD mode: FM signal input. Internal DC
FM Sig
Please consider input impedance.
C1
20μA
directory.
34kΩ
MOD mode: VD signal input. Please input VD signal
200Ω
bias is 3.3V. Please use capacitor (C1) coupling.
200Ω
5
1kΩ
Mode control
80μA
MOD mode/ DEMOD mode setting pin.
MOD mode: Please set over 2V DC voltage. (2 to 5V).
DEMOD mode: Please set under 0.4V DC voltage.
30μA
6
66kΩ
VD Sig
(0 to 0.4V).
1kΩ
6
Continued on next page.
No.A0783-7/10
LA72910V
Continued from preceding page.
Pin No.
7
Pin Name
Drop delay
Description
Equivalent circuit
MOD mode: TC1 filter pin. Please connect C1.
2kΩ
60μA
20μA
(TC1)
7
200Ω
C1
8
Drop Width
1kΩ
30μA
1kΩ
MOD mode: TC2 filter pin. Please connect C1.
2kΩ
60μA
(TC2)
8
1kΩ
30μA
200Ω
C1
9
Stand-by control
Standby control pin.
FM block standby: under 0.4V DC voltage. (0 to 0.4V)
30μA
FM block operate: over 2V DC voltage. (2 to 5V)
1kΩ
9
10
FM-DOC-OUT
DEMOD mode: Drop-out output pin. This pin is open
/2nd-Call control
collector output, so please connect pull up resistor.
30μA
MOD mode: 2nd-CALL input. 2nd-CALL input: under
0.4V (0 to 0.4V) DC. Normal: over 2V DC voltage. (2 to
5V)
1kΩ
Circuit GND.
Emphasis Monitor
MOD mode: Emphasis monitor pin.
/FM-AGC filter
DEMOD mode: FM AGC filter pin.
AGC-DET
EMP MONI
If FM AGC no need (=AGC Off),
Please set pin12 voltage over 4.5V DC voltage. (4.5 to
5V)
100kΩ
12
C1
10kΩ
500Ω
10kΩ
12
B-GND
60μA
11
300Ω
10
Continued on next page.
No.A0783-8/10
LA72910V
Continued from preceding page.
Pin No.
13
Pin Name
De-emphasis filter
Description
Equivalent circuit
DEMOD mode: De-emphasis filter pin.
De-emphasis time constant must be matching at emphasis
SIG
300μA
time constant.
(If you don’t need the emphasis, this pin is open.)
4.7kΩ
14
15
A-GND
Circuit GND.
VD control
DEMOD mode: Video signal output after De-emphasis.
/De-emphasis out
Output level is 0.5Vp-p.
Connect capacitor to clamp input (pin 16).
MOD mode: DFF control pin. DFF is ON at over 2V DC
200Ω
C1
2.5kΩ
13
R1
MOD : DC IN
voltage. (2 to 5V)
SIG
MOD mode: Video signal input pin (from camera).
DEMOD mode: Video signal input pin (from de-emphasis).
Input level is 0.5Vp-p.
Video input
MOD : 1Vp-p
DEMOD : 0.5Vp-p
16
C1
200Ω
Clamp
Input level is 1Vp-p.
500Ω
200μA
Video_IN
15kΩ
16
C1
1mA
DEMOD
3
No.A0783-9/10
LA72910V
Test Circuit
Current measure point
T1
180pF
1 Emphasis filter
Power Supply
VCC=5V
T3
T3A
10μF
+
SW3
T4
200Ω
T5A
1μF
+
1kΩ
0.1μF
A
B SW5
T4
T6
GND
T8
1000pF
Video_IN 16
VD control/
15
De-emphasis out
2 VCC(5V)
3 Main_OUT
Regulator
4 filter
T7
0.01μF
10μF
+
A
SW16 75Ω
+ B
1μF
T16
470Ω
A_GND 14
De-emphasis
13
filter
Emphasis Monitor
/FM-AGC filter 12
5
VD_IN
/FM_IN
6
Mode control
(mod/de-mod)
B_GND 11
Drop Delay
7
(TC1)
FM-DOC_OUT
10
/2nd-Call_IN
Drop Width
(TC2)
Stand-by
9
control
8
T15
T16A
Video_IN
T14
T13
1.8kΩ
100pF
T12
T11
T10
A
SW12
+ B
1μF
15kΩ
Pull
up
T9
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