Ordering number : ENA1859B Monolithic Linear IC LA72914V FM Modulator and Demodulator IC Overview The LA72914V is a FM modulation and demodulation IC for audio signals. And it is possible to use that for the data pulse or the control pulse, etc. Functions • Alignment-free FM modulator and demodulator of 4.5MHz. • Alignment-free FM modulator and demodulator of 6.5MHz. • ALC/ FMAGC, Emphasis/ De-emphasis • Carrier frequency adjustment function, Standby switch Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions Ratings VCC max Pd max Ta ≤ 70°C * Unit 7.0 V 300 mW Operating temperature Topr -20 to +70 °C Storage temperature Tstg -40 to +150 °C When mounted on a 114.3mm × 76.1mm × 1.6mm, glass epoxy. Recommended Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Allowable operating voltage range Symbol VCC VCC op Conditions Ta=25°C Ta = -20 to +70°C Ratings Unit 5.0 V 4.7 to 5.5 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. D0110 SY 20101118-S00005/N0410 SY/O2710 SY 20101008-S00006 No.A1859-1/9 LA72914V Electrical Characteristics at Ta = 25°C, VCC = 5V DC Characteristic Parameter Symbol Ratings Conditions min 2.4V regulator Current dissipation Control pin (6 pin) VREG Measure the DC voltage at pin 2 typ Unit max 2.2 2.4 2.6 V ICC1 Measure the current into pin 4 in normal mode. 26.0 33.0 40.0 mA ICC2 Measure the current into pin 4 in stand-by mode. 2.0 2.5 3.0 mA CNT6L Low level of input pin (6pin) in 4.5MHz TX mode. 0 0.4 V CNT6M Middle level of input pin (6pin) in stand-by mode. 2.0 3.0 V CNT6H High level of input pin (6pin) in 6.5MHz TX mode. 4.5 5.0 V AGCS Voltage of input pin (pin 11) in AGC stop 4.5 5.0 V 0 0.4 V Low level Control pin (6 pin) Middle level Control pin (6 pin) High level AGC stop at pin 11 control voltage TX OFF mode at pin 16 CNT16L Voltage of input pin (pin 16) in TX off mode control voltage Sound FM Modulation Block (TX) Parameter Symbol Conditions Ratings Unit FM carrier FFM1 Output frequency of T1B in no signals. T6=0.6V, T14:open min 4.455 output frequency FFM2 Output frequency of T1B in no signals. T6=4.2V, T14:open 6.435 6.500 6.565 MHz 1.9 2.3 2.6 Vp-p 1.3 1.7 2.1 Vp-p -30 -20 dB -30 -20 dB -60 -50 dB 20 25 30 kHz 7 12 17 kHz 0.45 0.5 0.55 Vp-p FM carrier output level VOFM1 Output level of T1B in no signals. typ 4.500 max 4.545 MHz Load impedance = 1kΩ T1-GND. T6=0.6V VOFM2 Output level of T1B in no signals. Load impedance = 1kΩ T1-GND. T6=4.2V FM carrier output second harmonics distortion 2HD1 2nd harmonics distortion of T1B in no signals. Load impedance = 1kΩ T1-GND. T6=0.6V 2HD2 2nd harmonics distortion of T1B in no signals. Load impedance = 1kΩ T1-GND. T6=4.2V FM carrier output mute level VFMT Output level of T1B in TX off mode. T6=0.6V (4.2V) FM deviation DEV Emphasis Characteristic FEMP FM deviation of T1A, T6=0.6V (4.2V), input at T16=1.0Vp-p/1kHz (sine) T16=200mVp-p, 1kHz (sine), M1=T1 output deviation. T16=200mVp-p, 5kHz (sine), M2=T1 output deviation. FEMP=M2-M1 ALC characteristic ALC1 T16A=0.25Vp-p, 1kHz (sine), T3:Open, T6=0.6V, T3 output level FM carrier “fo” adjustment (reference) ALC2 T16A=0.6Vp-p, 1kHz (sine), T3:Open, T6=0.6V, T3 output level 0.9 1.0 1.1 Vp-p ALC3 T16A=1.0Vp-p, 1kHz (sine), T3:Open, T6=0.6V, T3 output level 0.95 1.05 1.15 Vp-p FCNT1 No signal input. Measure T1B frequency. T16:Open, T6=0.6V (4.2V), T14=0.5V -0.22 MHz FCNT2 No signal input. Measure T1B frequency. T16:Open, T6=0.6V (4.2V), T14=4.5V +-.22 MHz Sound FM demodulation block (RX) Parameter Sound demodulation level Symbol VOUT1 Conditions Input signal: CAR=4.5MHz, DEV=±25kHz, MOD=1kHz, Ratings Unit min 0.6 typ 0.9 max 1.3 Vp-p 0.7 1.0 1.4 Vp-p Level: 100mVp-p. T5A input. Measure T9B signal level. (T9B-GND: ROUT=10kΩ) T6=4.2V VOUT2 Input signal: CAR=6.5MHz, DEV=±25kHz, MOD=1kHz, Level: 100mVp-p. T5A input. Measure T9B signal level. (T9B-GND: ROUT =10kΩ) T6=0.6V S/N SN1 Input signal: CAR=4.5MHz, No-modulation. Level: 100mVp-p. T5A input. T6=4.2V, (IHF-A) M1=T9B signal level. (T9B-GND: ROUT =10kΩ) SN1=20log(VOUT1/M1) 35 50 dB SN2 Input signal: CAR=6.5MHz, No-modulation. Level: 100mVp-p. T5A input. T6=0.6V, (IHF-A) M1=T9B signal level. (T9B-GND: ROUT =10kΩ) SN1=20log(VOUT2/M1) 35 50 dB Continued on next page No.A1859-2/9 LA72914V Continued from preceding page. Parameter Symbol THD THD1 Same condition VOUT1. Measure T9B signal. THD2 De-emphasis characteristic typ 0 0.3 max 1.0 Unit % 0 0.3 1.0 % Input signal: CAR=4.5MHz, DEV=±25kHz, MOD=5kHz, Level: 100mVp-p. T5A input. T6=4.2V, M1=T9B signal level. DEEM=20log(M1/VOUT1) -10 -7.5 -5 dB DEEM2 Input signal: CAR=6.5MHz, DEV=±25kHz, MOD=5kHz, Level: 100mVp-p. T5A input. T6=0.6V, M1=T9B signal level. DEEM=20log(M2/VOUT2) -10 -7.5 -5 dB FM AGC characteristic Same condition VOUT2. Measure T9B signal. Ratings min DEEM1 Trap-filter characteristic TRP1 T11=4.5V, T6=4.2V, T5A=4.5MHz, 100mVp-p. T12A=A1. T5A=6.5MHz. 100mVp-p. T12A=B1. TRP1=20log(B1/A1) -20 -15 dB TRP2 T11=4.5V, T6=0.6V, T5A=4.5MHz, 100mVp-p. T12A=A1. T5A=6.5MHz. 100mVp-p. T12A=B1. TRP2=20log(A1/B1) -20 -15 dB AGC1 T6=4.2V. T5A=4.5MHz, 300mVp-p. Measure T12 signal level. 250 350 450 mVp-p AGC2 T6=0.6V. T5A=6.5MHz, 300mVp-p. Measure T12 signal level. 250 350 450 mVp-p AGC3 T6=4.2V. T5A=4.5MHz, 30mVp-p. Measure T12 signal level. 200 300 400 mVp-p T6=0.6V. T5A=6.5MHz, 30mVp-p. Measure T12 signal level. 200 300 400 mVp-p 70 100 140 mVp-p 70 100 140 mVp-p AGC4 FM AGC STOP characteristic Conditions AGCSTP1 T6=4.2V. T11=4.5V, T5A=4.5MHZ, 100mVp-p. Measure T12 signal level. AGCSTP2 T6=0.6V. T11=4.5V, T5A=6.5MHz, 100mVp-p. Measure T12 signal level. FM input sensitivity FMIN1 Input signal: CAR=4.5MHz, DEV=±25kHz, MOD=1kHz, T6=4.2V. When T9B signal is OK, then measure T5A FM input level range. 30 100 300 mVp-p FMIN2 Input signal: CAR=6.5MHz, DEV=±25kHz, MOD=1kHz, T6=0.6V. When T9B signal is OK, then measure T5A FM input level range. 30 100 300 mVp-p Package Dimensions unit: mm (typ) 3178B 5.2 0.5 6.4 9 4.4 16 1 8 0.65 0.15 (1.3) 1.5max 0.22 0.1 (0.33) SANYO : SSOP16(225mil) No.A1859-3/9 LA72914V Pin Layout and Measurement circuit Sign: Highly accurate part use T1B T1 FM_out T2 T16 Audio_in /TX_CTL 16 1 FM_out VREG filter 2 (2.4V) Emphasis 3 filter Power supply (VCC) 5V 4 A ALC filter 15 T14 VCO_CTL 14 GND 13 VCC(5V) T5 T5A T6 T11 T7 Mode control 6 (TX,RX/STBY) AGC filter 11 De-emphasis T10 FM filter 10 De-emphasis 8 Audio_in Audio_out 9 T9B + GND T9 + De-emphasis filter 7 T8 FMAGC_OUT + MODE_CTL T12 FMAGC 12 monitor 5 FM_IN FM_IN AUDIO_IN + T3 T16A T15 Top view Block Diagram and Application Circuit VCO Auto tune ALC Filter FMAGC-OUT Monitor AGC Filter FM Filter 11 10 + 15 Bias 2.4V ALC (1.0Vp-p) 6dB AMP + 16 14 12 13 FMAGC 10k LPF VCO 4.5M/6.5M VREG 2.4V 1 2 FM-OUT (2Vp-p) Ripple Filter Phase Detector 6dB-AMP DRIVER Loop Filter VCO 6.5M/4.5M Offset Cancel Mode & Standby Control T4R6/STBY/T6R De-emphasis TRP 4.5M/6.5M 3 Emphasis Filter 5 4 6800pF FM-AMP DRIVER 9 FMAGC-DET Emphasis FMMOD Audio-OUT (1Vp-p) + TX control (High:TX-OFF /Low:TX-ON) Bias 2.4V 6 7 8 1000pF BPF VCC(5V) FM-IN (0.1Vp-p) State control T6R4:P-Up STBY:Open T4R6:P-Down De-emphasis Filter : Push-pull output No.A1859-4/9 LA72914V Pin Description Pin No. 1 Pin Name FM OUT Description Equivalent circuit 4.5MHz or 6.5MHz FM carrier output. Push-pull output pin. Output level is 2.5Vp-p (Load resistance=1kΩ) 1 2 2.4V REG Filter Internal regulator filter pin. Please connect 0.1μF (C1) 4V VCC 2 C1 3 Emphasis Filter Emphasis filter pin. Before FM modulation, make emphasis Characteristic at audio signal. C1(6800pF) Emphasis time constant must be matching de-emphasis time constant. (If you don’t need the emphasis, this pin is open.) 3 C1 4 VCC 5 FM IN VCC pin. Supply voltage is 5V DC. Please connect de-coupling capacitor. (about 47μF) FM signal input. Please use capacitor coupling. C1 SIG 5 2.4V 6 Mode CTL MODE control pin. Control modulation frequency TX=4.5MHz: 0 to 0.4V Stand-by: 2.0 to 3.0V TX=6.5MHz: 4.5V to VCC 6 Continued on next page. No.A1859-5/9 LA72914V Continued from preceding page. Pin No. 7 Pin Name De-emphasis Filter Description Equivalent circuit De-emphasis filter pin. De-emphasis time constant must be matching at emphasis time constant. Recommend value is 6800pF to 0.01μF. Connect Cap. Coupling to pin8. SIG 7 C1 8 RX Audio IN Internal DC bias is 2.4V. Please connect Cap. coupling. 8 C1 2.4V 9 Audio OUT Audio signal output pin. Push-pull output pin. Output level is 1.0Vp-p at 1kHz. (Load resistance=10kΩ) 9 10 FM Filter FM demodulator filter pin. Please connect 1.0μF capacitor. (If you need rising of low frequency gain, then change more large capacitor in use.) 10 11 AGC Filter FM AGC filter pin. AGC-DET Please connect 0.1μF capacitor. If you need reduce AGC-gain, then connect resistor (R1: 11pin-VCC) If FM AGC no need, please set pin11 voltage over 4.5V R1 DC voltage. 11 C1 Continued on next page. No.A1859-6/9 LA72914V Continued from preceding page. Pin No. 12 Pin Name AGC monitor Description Equivalent circuit FM AGC monitor pin. 12 13 GND 14 VCO CTL GND pin. Modulation frequency fine control pin. Adjustment frequency is, about ±220kHz at 0.5V to 4.5V DC. VR1 14 C1 2.4V 15 ALC CTL Audio ALC filter pin. Please connect 0.47μF capacitor. 15 C1 16 TX Audio IN Audio signal input pin. (TX-OFF_CTL) Internal bias is 2.4V DC. Please use capacitor coupling. If DC voltage set to under 0.4V DC, then modulator circuit stops. Demodulation circuit is work. This is receiving only mode. (TX-OFF: 0 to 0.4V) 16 C1 2.4V Signal processing outline [Modulation block] • Audio signal is input from pin16. (Internal bias is DC 2.4V.) Go through AMP (6dB)/ALC/LPF (10 kHz) and emphasis circuit, then input FM-modulation block. After FM-modulation block, go to output driver block then FM-audio signal output from pin1. • ALC: ALC circuit work at pin16 input level over than 0.5Vp-p. • LPF: LPF gain is -3dB at 10 kHz and -6dB/oct. Keep over modulation from emphasis characteristic. • Emphasis circuit: The pin3 owns an Emphasis characteristic which connected capacitor. Recommended value = 6800pF. • FM modulation: Carrier frequency is choosing from pin6 voltage. When pin16 input level is 0.5Vp-p, then FM deviation set to ±25 kHz. Internal LPF reduce harmonic spectrum. • Output Driver: Output AC voltage is about 2.0Vp-p. (Load resistance: 1kΩ) No.A1859-7/9 LA72914V [De-modulation block] • Demodulate audio signal from modulated audio signal. • FM-Audio signal is input from pin5. Go through 4.5M-Trap-filter or 6.5MHz-Trap-filter and AGC go to demodulator. After demodulator go to De-emphasis circuit. After de-emphasis circuit signal is output pin7. Pin7 signal is charge to DC bias for coupling capacitor at pin8. Audio signal from pin8 go to 6dB AMP then output from pin9. (Door-phone application, there are two FM carrier. In this case we recommend add BPF before pin5 FM-Audio signal input.) • 4.5M/6.5MHz-Trap-filter: Internal Trap-filter is change for pin6 mode control. (If modulator frequency is 4.5MHz, then internal Trap-filter is 4.5MHz.) • AGC: After AGC level is control about 0.3Vp-p. After AGC signal go to pin12 FM-monitor and de-modulator. • De-emphasis circuit: The pin7 owns an De-emphasis characteristic which connected capacitor. Recommended value = 10nF. • Output signal level: If input FM signal deviation is ±25 kHz, then output signal level is 1Vp-p (TYP) from pin9/ (Load resistance: 10kΩ at 1 kHz.) Characteristics ALC characteristics 600 FMAGC characteristics fo=4.5MHz (unmodulated signals) 500 2000 Output level, [mVp-p] Internal level of IC, [mVp-p] 2500 6dB 1500 Pin 9 1000 ALC 400 Pin 12 300 200 Pin 16 500 100 0 0 0 200 400 600 800 1000 1200 Input level, [mVp-p] 3 1 10 100 1000 10000 Input level, [mVp-p] Frequency responce TxIn-RxOut Output level, [dB] 0 -3 -6 -9 -12 -15 0.01 0.1 1 10 100 Frequency, [kHz] No.A1859-8/9 LA72914V Application example WIRE BPF 4.5MHz BPF 6.5MHz RX 4.5MHz MIC LA72914V (pin6:High) RX 6.5MHz LPF 6.5MHz TX 6.5MHz LPF 4.5MHz TX 4.5MHz LA72914V (pin6:Low) MIC [Above-mentioned recommendation BPF] Made by Murata Mfg.: SFSKA4M50DF00 (4.5MHz)/SFSKA6M50CF00 (6.5MHz) SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written consent of SANYO Semiconductor Co.,Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO Semiconductor Co.,Ltd. product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of Novenber, 2010. Specifications and information herein are subject to change without notice. PS No.A1859-9/9