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Ordering number : ENA1409
Monolithic Linear IC
LA72912V
Overview
FM Modulator and Demodulator IC
The LA72912V 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
* ASK modulation and demodulation * 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 = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Ta 70C * Conditions Ratings 7.0 300 -30 to +70 -40 to +150 Unit V mW C C
* Mounted on a 114.3mm x 76.1mm x 1.6mm, glass epoxy board.
Recommended Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Allowable operating voltage range Symbol VCC VCC op Ta = -30 to +70C Conditions Ratings 5.0 4.7 to 5.5 Unit V V
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
21809 MS 20090128-S00005 No.A1409-1/12
LA72912V
Electrical Characteristics at Ta = 25C, VCC = 5V DC CHARACTERISTICS T6 = 0.4V, T17 = 2.0V, T18 = 0.4V
Parameter Control terminal (Pin6,9) Low level Control terminal (Pin6,9)High level Input5 Low level Input5 High level Input18 Low level Input18 High level Output18 terminal High level Output18 terminal Low level InpuT20 Low level InpuT20 High level 5pin AC input dynamic range 16pin AC input dynamic range OPL13 OPL18 IN20L IN20H ACIN5 ACIN16 T20 T20 T5A T24A T20 T20 T3 T3 T18 Symbol CNT6L CNT17L CNT6H CNT17H IN5L IN5H IN18L IN18H OPH18 In T6 T17 T6 T17 T5 T5 T18 T18 T18 OUT Conditions Low level of control terminal of ALL mode. T6 = 0.4V(DEMOD mode),T17 = 0.4V (Standby mode) High level of input terminal of ALL mode T6 = 2.0V (MOD mode), T17 = 2.0V (Normal mode) Low level of input terminal of MOD mode T6 = 2.0V, T17 = 2.0V, T18 = 0.4V High level of input terminal of MOD mode T6 = 2.0V, T17 = 2.0V, T18 = 0.4V Low level of input terminal of MOD mode T5 = 0.4V, T6 = 2.0V, T17 = 2.0V High level of input terminal of MOD mode T5 = 0.4V, T6 = 2.0V, T17 = 2.0V DEMOD mode: FM-Signal input T6 = 0.4V, T17 = 2.0V, Pull-UP:15K T18: DEMOD mode: FM No-signal Measure the sink level of output terminal. T6 = 0.4V, T17 = 2.0V, Pull-UP:15K Voltage of terminal at AGC ON T6 = 0.4V, T17 = 2.0V Voltage of terminal at AGC OFF T6 = 0.4V, T17 = 2.0V Input amplitude level of FM signal Freq: 11.5MHz to 13.5MHz Maximum input level of T24A 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,T17=2.0V,T18=0.4V
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 T24A T24A 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 200 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 T24A 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 T24A 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 = 0.01F, Minimum VD pulse width to which TC1B is normally output 63 s TC2 T5 T3 C8 = 0.001F, Stop time of FM carrier of T3 30 40 50 s LWC LDC TC1 T24A T20 T24A T20 T5 T3 GME2 T24A T20 GEMP GME1 T24A T20 T24A T20 f3.35 - (f3.85 + f2.85) / 2 x100 f3.85 - f2.85 -7.5 0.0 4.0 180 -60 240 -6.0 1.5 5.5 200 -50 300 -4.5 3.0 7.0 220 -40 360 dB dB dB % % s -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 22.0 typ 27.0 1.8 max 32.0 2.2 Unit mA Vp-p
With VIN a 300mVp-p 10kHz sine wave, Measure the ratio of the levels on T24A and T20 With VIN a 300mVp-p 500kHz sine wave, Measure the ratio of the levels on T24A and T20 With VIN a 300mVp-p 2MHz sine wave, Measure the ratio of the levels on T24A and T20 With VIN a 1.5Vp-p 100% white video signal. Measure the white clipping level on T20 With VIN a 1.5Vp-p 100% white video signal. Measure the dark clipping level on T20. C7 = 0.01F, Time from fall of T5 signal to doing of FM carrier of T3 STOP
No.A1409-2/12
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 T5A T5A T3 T3 In OUT Conditions Measure the currents into pin 2 (DEMOD mode) Demodulation level, when the FM signal of 2.2MHz deviation. Load impedance = 1k T3-GND. 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.) 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" Shift time from T5 = 300mVp-p 0mVp-p to T18 "Low". 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" Confirmation of output of Video signal from T3. Measurement of DC level. T18 T20 T4 T5A T5A T5A T3 T3 T3 T3 T5A T23 Mute level measurement of T3 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 Calculate FM demodulation linearity LDEM1 = {[VDEM21 - (VDEM11 + VDEM31) / 2] / (VDEM31 - VDEM11)}x100 LDEM2 = {[VDEM22 - (VDEM12 + VDEM32) /2 ] / (VDEM32 - VDEM12)}x100 LDEM3 = {[VDEM23 - (VDEM13 + VDEM33) / 2] / (VDEM33 - VDEM13)}x100 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 Main linear de-emphasis amplitude Main linear de-emphasis Characteristics(1) Main linear de-emphasis Characteristics(2) GMED2 T5A T23 GMED1 T5A T23 GMED T5A T23 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). T5 = 200mVp-p FM signal (fm = 2MHz, Center Carrier = 9.25MHz, DEV = 2.0MHz). Signal level of T23 versus GMRD (Ratio of GMED) -3.5 -1.5 +0.5 dB 481 535 589 mVp-p 0.28 0.33 0.38 V/MHz -2 0 +2 % 1.1 1.6 2.1 V 0.7 1.2 1.7 V Shift time from T5 = 0mVp-p 3 00mVp-p to T18 "High" Measurement of T4 DC level. DEV = 2.0MHz. Input amplitude level of FM signal. (T5A: 11.5MHz to 13.5MHz) 0 0 0 0.3 0.2 1.5 2.5 sec 0.5 0.5 Ratings min 26.0 2.09 1.9 typ 32.0 2.2 2.0 max 38.0 2.31 2.1 Unit mA Vp-p Vp-p
FM stop detection level (DOC characteristic 1)
DOC1
T5A T20
T18 T20
40
60
mVp-p
(Drop Delay Down) FM return judgment level
DDD DOC2
T5A T20 T5A T20
T18 T20 T18 T20
1.5 60
2.5 90
s mVp-p
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
T5A T20 T5A T20
T23
1.0
1.5
V
VREG ACIN5 DG DP MUV VDEM11 VDEM12 VDEM13 VDEM21 VDEM22 VDEM23 VDEM31 VDEM32 VDEM33 LDEM1 LDEM2 LDEM3
3.9
4.0 500 6 6 10 0.8
4.3 1000 10 10 20 1.3
V mVp-p % deg IRE V
-6.5
-4.5
-2.5
dB
No.A1409-3/12
LA72912V
ASK Block T17=0.4V
Parameter Current dissipation at standby Current dissipation at standby at MOD-AGC-OFF Current dissipation at standby at DEMOD-AGC-OFF Standby release time(1) (FM stoprelease) Standby release time(2) (Video signal stop release) ASK Transmitting time "transmission" ASK Transmitting time "Receive" ASK transmission setup time ASK minimum detect level ASK start up time ASK demodulation duty ratio VASK OASK DASK WASK T10A T12 T11 T16A T13 T16A T13 T16A T13 TASK2 TASK1 SASK2 SASK1 ICCSc T17 T15 T20 T6 T17 T6 T5A T17 T10A T12 T11 T16A T13 T3 T3 T6 = 2.0VDC T17 = 0V2V (Standby release) Time until FM carrier is output to T3. T6 = 0.4V, T5 = DEV = 2.0MHz 100% white video signal of FM signal. T17 = 0V 2V (Standby release) Time until white 100% signal is output to T3 T10A = 1MHz,0/2V Pulse T11 = 20KHz, 0/2VPulse. Measure T12 signal appear time T16 = 1MHz, 300mVp-p-SIN wave Measure time T13 appear detected T16 signal T10A = 1MHz, 0-2V-pulse T11 = 20KHz,0-2V-pulse Measure T11 input interval time when T10A input Measure T16 minimum level at T13 is normally condition Measure time ASK working from Power-ON T16 = T12 output signal (0-2Vp-p) Measure ASK Duty difference with 50% DASK = (pulse width s / 50s) - 50% x 100% 0.2 -15 30 -2 3 300 11 Vp-p ms % 10 100 ms 0.1 0.1 ms ms 2.0 7.0 12.0 s 0.0 6.0 12.0 s At standby mode, measures include current to pin2,9. T17 = 0.4V, T15 = 5V, T20 = 5V 16.8 21.0 25.2 mA ICCSb T17 T15 Symbol ICCS In T17 OUT Conditions At standby mode, measures include current to pin2,9. T17 = 0.4V, T15 and T20:open At standby mode, measures include current to pin2,9. T17 = 0.4V, T15 = 5V, T20:open Ratings min 10.8 12.8 typ 13.0 16.0 max 15.5 19.2 Unit mA mA
No.A1409-4/12
LA72912V
Package Dimensions
unit : mm (typ) 3175C
7.8 24 13
5.6
7.6
1 0.65 (0.33) 0.22
12 0.15
SANYO : SSOP24(275mil)
Pin Assignment
0.1
(1.3)
1.5max
0.5
Emphasis filter 1 VCC5V 2 FM/Video Output 3 4V Regulator 4 FM/VD input 5 MOD/DEMOD Control 6 TC1(MOD)/FMAGC monitor Out control 7 TC2(DEMOD)/FMAGC monitor Output 8 ASK-VCC5V 9 ASK CAR IN 10 ASK DATA IN 11 ASK TX Output 12
24 Video input 23 /V-2V select 22 A-GND 21 De-emphasis filter 20 FM AGC filter 19 B-GND 18 /2nd-Call input 17 Stand-by control 16 ASK RX input 15 /AGC OFF
ASK AGC filter DOC-OUT De-emphasis output
Top view
LA72912V
14 ASK DET filter 13 ASK RX Output
No.A1409-5/12
LA72912V
Block Diagram and Application Circuit Exanple1 Modulation (Outside camera)
Emphasis Monitor
Video-IN A-GND
ASK-RX OUT Outside camera SW ASK-AGC ASK-RX (Hi : CAR having) ASK-RX IN 2nd-call : Lo Filter Filter VDD Standby SW (OFF : 4.5V) (Lo : FM-OFF) (Hi : FM-ON) LPF D-GND *1
24
23
22
21
20
19
18
17
16
15
14
13
*1
Main De-Emph Clamp FM-DEMOD/LPF -6dB
FM-AGC-DET D-LIM
Doc-DET (Doc-LO)
Standby Control LPF
ASK-AGC DET
ASK-AGC/ASK-RX /Comparator
FM-AGC(ON/OFF) Main Emphasis 12dB-AMP Video-Mute LPF MOD/DEMOD Control FM-Stop,Polarity E(VD) & A(SW) REG A-VCC FF TC1 TC2 Amp(ON/OFF) ASK-VCC ASK-TX /Modulator
FM-MOD LPF
FM-stop
1
2
*2
3
4
5
6
7
8
9
VCC(5V)
10
11
12
*2
VCC(5V) FM-OUT MOD : Hi VD-IN VD : Hi DEMOD : Lo 5V
ASK-DATA IN BPF (Hi : CAR-OFF) ASK-CAR IN ASK-TX OUT *1: Open collector Output *2: Push-Pull Output
Application Circuit Exanple2 Demodulation (Inside monitor)
FM-AGC OFF (OFF : 4.5V) ASK-RX OUT ASK-AGC ASK-RX (Hi : CAR having) ASK-RX IN DOC-OUT Filter Filter Standby SW VDD (OFF : 4.5V) (Lo : FM-OFF) (Hi : FM-ON) D-GND LPF
A-GND
24
23
22
21
20
19
18
*1
17
16
15
14
13
*1
Main De-Emph Clamp FM-DEMOD/LPF -6dB
FM-AGC-DET D-LIM
Doc-DET (Doc-LO)
Standby Control LPF
ASK-AGC DET
ASK-AGC/ASK-RX /Comparator
FM-AGC(ON/OFF) Main Emphasis 12dB-AMP Video-Mute LPF MOD/DEMOD Control FM-Stop,Polarity E(VD) & A(SW) REG A-VCC FF TC1 TC2 Amp(ON/OFF) ASK-VCC ASK-TX /Modulator
FM-MOD LPF
FM-stop
1
2
*2
3
4
5
6
7
8
9
10
11
12
*2
VCC(5V) Video-OUT
MOD : Hi ASK-DATA IN BPF VCC(5V) DEMOD : Lo (Hi : CAR-OFF) GND FM-OUT (FM-OUT) FM-IN Control ASK-CAR IN ASK-TX OUT (ON/OFF) *1: Open collector Output *2: Push-Pull Output
No.A1409-6/12
LA72912V
Pin Function
Pin No. 1 2 3 4 5 Pin name Emphasis filter VCC5V FM/Video Output 4V Regulator FM/VD input FM MOD mode(Outside camera) Emphasis filter connection pin VCC for FM modulation. FM Output (RO=200:1.8Vp-p) FM modulate block and ASK bock supply reference voltage. VD Input. (Hi: over 2V, Low: under 0.4V) (VD DET: High) 6 7 MOD/DEMOD Control TC1(MOD)/ FMAGC monitor Out control 8 TC2(DEMOD)/ FMAGC monitor Output 9 10 11 12 13 14 15 ASK-VCC5V ASK CAR IN ASK DATA IN ASK TX Output ASK RX Output ASK DET filter ASK AGC filter /AGC OFF 16 17 ASK RX input Standby control VCC for ASK ASK carrier Input. (Recommend below 3Vp-p) ASK Data Input. (Hi: more than 2V, Lo: below 0.4V) ASK modulated signal Output ASK Demodulated Output ASK Detector filter AGC filter for ASK. (When AGC operate voltage is 0V to 3V, AGC stop when you add over 4.5V.) ASK Demodulate Input FM blocks standby control. (FM block operate: over 2V, FM block standby: under 0.4V ) 18 19 20 DOC-OUT /2nd-Call input B-GND FM AGC filter 2ND-Call input, 2ND-Call: Low (High: over 2V, Low: under 0.4V) Circuit GND Emphasis monitor output DOC output (When DO-DET, output is Low) FM AGC control filter (AGC-ON:0 to 3V DC, AGC-OFF:4.5V to 5V by external DC voltage.) 21 22 23 De-emphasis filter A-GND De-emphasis output /V-2V select Non connect(Hi-Z) Circuit GND DFF for V-diff control (ON: over 2V, OFF: under 0.4V) De-emphasis filter connection pin. DE-emphasis output MOD mode; VD diff. Count select 0V : VD through 2V : VD 1/2 diff 24 Video input Video signal input. (from outside CCD camera: 1Vp-p). Video signal input. (from de-emphasis block: 0.5Vp-p). MOD mode: Maximum video input level is 1.5Vp-p. If you don't need, this pin is open. MOD mode: Don't connect capacitor. DEMOD mode: Open collector output. 3.3V by internal bias. (34k/66k) Push-pull output Open collector output ASK carrier detect = Lo 2.1V by internal bias. (50k) Set capacitor for TC2 FMAGC monitor output Can do second inside monitor addition Set over 2V DC voltage. Set capacitor for TC1 Set under 0.4V DC voltage. FMAGC monitor out control GND: Monitor ON / VCC: Monitor OFF Outside camera / Inside monitor setting. Can do second inside monitor addition FM DEMOD mode(Inside Monitor) Non connect(Hi-Z) VCC for FM demodulation. Video Output (RO=1k: 2Vp-p) FM demodulate block and ASK bock supply reference voltage. FM Input. (Recommend Level: 100 to 620mVp-p) DEMOD mode: Set 3.3V by internal bias. (34k/66k) Push-pull output Note If you no need, this pin is open.
No.A1409-7/12
LA72912V
Pin Description
Pin No. 1 Pin Name Emphasis filter Description Main Emphasis filter pin. Before FM Modulation, make emphasis characteristic at video signal. Emphasis time constant must be matching at de-emphasis time constant. (If you don't need the emphasis, this pin is open.)
R1 C1 200 1k 620 2.7k
Equivalent circuit
1
2 3
VCC5V FM/Video OUT
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=200) DEMOD mode: Video signal output. (2.0Vp-p: Rout=1k)
MOD
40
3
DEMOD
40
4
Regulator filter
Internal regulator filter pin. Please connect 0.1F (C1).
4
23k C1 10k 50k
5
FM/VD input
DEMOD mode: FM signal input. Internal DC bias is 3.3V. Please use capacitor (C1)
FM Sig
20A
30A 1k
coupling. MOD mode: VD signal input. Please input VD signal directory. Please consider input impedance.
C1
5
200 1k
66k
200
34k
VD Sig
6
MOD/DEMOD Control
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. (0 to 0.4V).
6
7
TC1(MOD)/ FMAGC monitor Control
MOD mode: TC1 filter pin. Please connect C1. DEMOD mode: FM-AGC monitor on/off control. GND: AGC-monitor ON VCC: AGC-monitor OFF
2k 60A 20A
7
C1
200 1k
1k
80A
30A
Continued on next page.
No.A1409-8/12
LA72912V
Continued from preceding page.
Pin No. 8 Pin Name TC2(DEMOD)/ FMAGC monitor Output
2k
Description MOD mode: TC2 filter pin. Please connect C1. DEMOD mode: FM-AGC-monitor output
Equivalent circuit
60A
8
C1
200
1k
30A
9 10
ASK-VCC5V ASK CAR IN
ASK block VCC. Please supply DC 5V with use capacitor for de-coupling. ASK carrier input Pin. Please connect with capacitor, 2.1V by internal biased.
ASK carrier
Max 3.0Vp-p 1k
10
C1 50k 2.1V
11
ASK DATA IN
ASK data input pin. L level is lower than 0.4V H level is more than 2V
ASK data
10k 30A
11
30k
12
ASK TX Output
ASK output pin. Push-pull type output.
40
12
40
13
ASK RX Output
ASK detect output. Open corrector type output.
13
300
14
ASK DET filter
ASK detect filter. Connect capacitor for reject of ASK AC component.
SIG
50k 50k
14
C1
300 60A
Continued on next page.
No.A1409-9/12
LA72912V
Continued from preceding page.
Pin No. 15 Pin Name ASK AGC filter /AGC OFF AGC filter pin for ASK. Please connect pull-up resistance to this pin, and do more than 4.5V at voltage of this pin.
100k
Description
Equivalent circuit
AGC-DET
15
C1
10k 500 60A 10k
16
ASK RX input
ASK input pin. Please connect with capacitor, 3.3V by internal biased.
ASK signal
C1 34k 200
16
300 66k 80A
17
Standby control
Standby control pin. FM block standby: under 0.4V DC voltage. (0 to 0.4V) FM block operate: over 2V DC voltage. (2 to 5V)
1k 30A
17
18
DOC-OUT /2nd-Call input
DEMOD mode: Drop-out output pin. This pin is open collector output, so please connect pull up resistor. MOD mode: 2ND-CALL input. 2ND-CALL input: under 0.4V DC voltage. (0 to 0.4V) Normal: over 2V DC voltage. (2 to 5V)
1k 30A
18
300
19 20
B-GND FM AGC filter
Circuit GND. MOD mode: Emphasis monitor pin. DEMOD mode: FM AGC filter pin. If FM AGC no need ( = AGC Off), Please set pin 12 voltage over 4.5V DC voltage. (4.5 to 5V)
100k AGC-DET EMP
20
C1
10k 500 60A
10k
21
De-emphasis filter
DEMOD mode: De-emphasis filter pin. De-emphasis time constant must be matching at emphasis time constant. (If you don't need the emphasis, this pin is open.)
300A
SIG
21
C1
4.7k 2.5k
R1
22
A-GND
Circuit GND.
Continued on next page.
No.A1409-10/12
LA72912V
Continued from preceding page.
Pin No. 23 Pin Name De-emphasis output /V-2V select Description DEMOD mode: Video signal output after De-emphasis. 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 voltage. (2 to 5V)
MOD : DC IN
200 SIG
Equivalent circuit
DEMOD
23
C1 1mA
24
Video input
MOD mode: Video signal input pin (from camera). Input level is 1Vp-p. DEMOD mode: Video signal input pin (from de-emphasis). Input level is 0.5Vp-p.
Video input MOD : 1Vp-p DEMOD : 0.5Vp-p
Clamp
15k
200
24
C1
500 200A
No.A1409-11/12
LA72912V
Test Circuit
T1 2.2k T24 10F + A SW24 +B 1F T24A 75 BNC
47pF BNC A SW3 B GND 1k 180 10F +
1 Emphasis filter
T2 T3 T4 T5
Video input 24 De-emphasis output /V-2V select 23 A-GND 22 De-emphasis filter 21 FM AGC filter 20 B-GND 19 DOC-OUT /2nd-Call input 18 Stand-by control 17 ASK RX input 16 ASK AGC filter /AGC OFF 15 ASK DET filter 14 ASK RX Output 13
T23
Current measure
2 VCC5V 3 FM/Video Output 4 4V Regulator 5 FM/VD input
T21 T20
27pF 4.7k A SW20 +B 1F Pull up
BNC
T5A
1F + Mode select switch
A B SW5 T6 T7 0.01F T8 0.001F T10
6 MOD/DEMOD Control 7 TC1(MOD)/FMAGC monitor Out control 8 TC2(DEMOD)/FMAGC monitor Output 9 ASK-VCC5V 10 ASK CAR IN 11 ASK DATA IN 12 ASK TX Output
T18 T17 T16
15k
Total current measure Power supply VCC=5V T10A 0.1F T11 T12 Current measure
T16A T15 + T14 T10 1F 0.1F Pull up 15k
BNC
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This catalog provides information as of February, 2009. Specifications and information herein are subject to change without notice. PS No.A1409-12/12

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