Ordering number:EN4091 Monolithic Linear IC LA7285, 7285M VCR Audio Signal Recording and Playback Processor Overview Package Dimensions The LA7285 and LA7285M include on chip all functions required for the record and playback of VCR audio signals. In addition, the inclusion of a switching circuit for switching between tuner and line input in addition to the circuits provided by earlier ICs makes the LA7285 truly optimal for audio VCR products. unit:mm 3067-DIP24S [LA7285] Funtions • • • • • • • • • • Equalizer amplifier Line amplifier Recording/playback switch Recording amplifier Mute SP, LP, EP switch Ripple filter ALC Tape head switch Line/tuner input switch SANYO:DIP24S unit:mm 3112-MFP24S [LA7285M] Features • Built-in input switching circuit (for the line and tuner inputs). • Smaller package leaves large space for other components. • Equalizer input/output capacitors not required. • Low gain variation eliminates the need for external ajustment. • Supply voltage : 9V and 12V operation. Specifications Maximum Ratings at Ta = 25˚C Parameter Maximum supply voltage Pin1 input voltage SANYO:MFP24S Symbol VIN1 VIN1 Pin1 input current Allowable power dissipation Conditions Ratings VCCmax Pd max DC Ta≤65˚C Unit 14 V +65 Vp-p ±1.5 mA 400 mW Operating temperature Topr –10 to +65 ˚C Storage temperatrure Tstg –55 to +150 ˚C Operating Conditions at Ta=25˚C Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCCop Conditions Ratings Unit 12 V 8.5 to 12.75 V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquaters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 53098HA (KT) No.4091-1/7 LA7285, 7285M Operating Characteristics at Ta=25˚C, VCC=12V, f=1kHz, 0dBV : 1.0 Vrms Parameter Symbol Conditions Ratings min typ max Unit Current consumption (EE) ICCE No signal 9.5 13.0 16.5 mA Current consumption (PB) ICCP No signal 9.5 13.0 16.5 mA Current consumption (REC) ICCR No signal 8.0 11.0 14.0 mA Open-circuit voltage gain VGOE VO=–7dBV 66.0 71.0 Equivalent input noise voltage VNIE Rg=2.2kΩ, DIN Audio filter 1.2 1.8 µVrms [Equalizer amplifier] dB [Line amplifier] Voltage gain (PB input) Voltage gain (EE, LINE input) Total harmonic distortion Output noise voltage Maximum output voltage Output voltage when ALC is on VGLP VGLE, VGLL VO=–7dBV 21.0 21.5 22.0 dB VO=–7dBV 21.0 21.5 22.0 dB THDL VNOL VOML VO=–7dBV 0.05 0.3 % Rg=2.2kΩ, DIN Audio filter –72 –66 dBV THD=1% VOA ALC VIN=–27dBV THDA VIN=–27dBV Voltage gain (open) VGOR Voltage gain (colse) VGOR VO=–7dBV VO=–7dBV Total harmonic distortion THDR Maximum output voltage VOMR ALC effect Distortion when ALC is on 1.5 2.1 –8.0 –7.0 –6.0 dBV 1.0 3.0 dB 0.05 0.6 % VIN=–27dBV to –7dBV Vrms [Recording amplifier] 47.0 52.0 12.5 13.0 13.5 dB 0.1 0.3 VO=–7dBV THD=1% 1.5 Pin 23 DC voltage 2.5 6.0 Pin 23 DC voltage 0 1.5 2.0 dB % Vrms [Mute circuit] On voltage Off voltage Mute attenuation (PB,EE) Mute attenuation (REC) VMON VMOFF MP,ME MR V V 80 90 dB 65 75 dB [EP, LP, SP switch circuit] EP mode hold voltage VEE Pin 21 DC voltage 3.6 6.0 V LP mode hold voltage VEL Pin 21 DC voltage 1.8 2.6 V SP mode hold voltage VES Pin 21 DC voltage 0 1.0 V VLL VLT Pin 22 DC voltage 3.6 6.0 V Tuner mode hold voltage Pin 22 DC voltage 1.8 2.6 V PB mode hold voltage VLP Pin 22 DC voltage 0 1.0 V VRR VRE Pin 24 DC voltage 3 0 VCC 1.0 V Pin 24 DC voltage [Line/Tuner PB switch circuit] Line mode hold voltage [REC, EE switch circuit] REC mode hold voltage EE mode hold voltage V [Head Select Switch] RON1 RON2 I1=±1mA 20 30 Ω Pin 2 on resistance I2=±1mA 5 10 Ω Pin 2 input voltage VIN1 Ta=65˚C, f=80kHz (sin), ILK=10µA ±45 V Pin 1 on resistance No.4091-2/7 LA7285, 7285M Block Diagram Test Circuit Unit (resistance:Ω, capacitance:F) No.4091-3/7 LA7285, 7285M Switch Operation Table SW1 SW2 SW3 SW4 SW5 Measure 1 1 2 1 5V VR GND Input 2 VM GND VL ICCE Test item (symbol) – A ICCP 2 1 1 2 1 GND GND GND – A ICCR 2 1 1 2 1 GND 5V 5V – A VGOE 1 2 3 2 1 GND GND GND VIN1 VO1 VNIE 2 1 3 2 1 GND GND GND – VO1 VGLP, THDL, VOML 2 1 2 2 1 GND GND GND VIN2 VGLE, VGLL 2 1 1 2 1 GND 2.5V, 5V GND VIN3, VIN4 VO2 VO2 VNOL 2 1 3 2 1 GND 5V GND – VO2 VOA, ALC, THDA 2 1 3 1 1 GND 2.5V, 5V GND VO2 VGOR 2 1 3 2 2 GND 5V GND VIN3, VIN4 VIN5 VGOR, THDR, VOMR MP 2 1 3 2 1 GND 5V GND VIN5 VO3 VO3 1 1 1 2 1 5V GND GND VIN1 VO2 MR 2 1 1 2 1 5V 5V GND VIN5 VO3 ME 2 1 3 2 1 5V 5V GND VIN2 VO2 Sample Application Circuit Unit (resistance:Ω, capacitance:F) No.4091-4/7 LA7285, 7285M Pin Function Pin No. Unit (resistance:Ω) Function name Internal circuit for pin Description of function 1 Head switch1 (high withstand voltage) EE, PB → off, REC → off On resistance → 20Ω(typ) Withstand voltage when off → ±45V (f=80kHz) 2 EQ AMP input and Head switch2 Input impendance for playback signal input from head → 80kΩ (typ) EE, REC → on PB → off On resistance → 5Ω (typ) 3 GND GND for pin 1 head switch and Equalizer Amplifier only 4 EP mode switch1 5 EP mode switch2 6 EQ AMP NFB 7 EQ AMP output 8 9 LINE AMP PB input Use to change tape heads and resonant frequency. On resistance → 15Ω (typ) Input impendance → 10kΩ (typ) (EP mode) Switches the Playback Equalizer Amplifier high-region frequency voltage gain. On resitatance → 15kΩ (typ) Input impedance → 10kΩ (typ) (EP mode) Equalizer Amplifier negative feedback pin Internal reference Inputs the playback signal from the Equalizer Amplifier. Because the input impedance is as high as 110KΩ, a 0.1µF ceramic capacitor can be used for the coupling capacitor on pin 8. Wave detection is performed when connected to GND through a capacitor. In addition, the attack and recovery time is set by C and R time constants. ALC FILTER Inputs EE and REC signals. Internal reference 10 TUNER input 11 GND The reference input is set by resistors R1 and R2. The amplifier gain is fixed at 21.5dB. In addition, because the input impedance is as high as 110kΩ, a 0.1µF ceramic capacitor can be used for the coupling capacitor on pin 10. GND for all circuit blocks except the head switch and Equalizer Amplifier. Continued to next page. No.4091-5/7 LA7285, 7285M Continued from proceeding page. Pin No. Function name Unit (resistance:Ω) Internal circuit for pin Description of function Inputs EE and RE signals. 12 LINE input 13 ALC input wave detection 14 LINE AMP output Internal reference The reference input is set by resistors R1 and R2.The amplifier gain is fixed at 21.5 dB. In addition, because the input impedance is as high as 110kΩ, a 0.1µF ceramic capacitor can be used for the coupling capacitor on pin 12. Inputs the Line Amplifier output signal. The ALC level is set by the resistors R1 and R2. Output inpedance → 50Ω (typ) Inputs the recording signal from Line Amplifier. 15 REC AMP input The recording current is set by the resistors R1 and R2. A coupling capacitor is unnecessary as pin 15 is a zero baias input. LP mode switch Used to adjust the high-region peaking frequency during recording amplifier in LP mode. On resistance → 15Ω (typ) Intput inpedance → 50Ω (typ) 17 REC AMP NFB Recording amplifier negativefeedback input. Used to adjust the high-region peaking frequency of the recording amplifier with an L, C, R network connected to ground. 18 REC AMP output Output inpedance → 40Ω (typ) 19 Ripple filter 20 Supply voltage (VCC) VCC max=14V VCC=8.5V to 12.75V EP/LP/SP Control When the voltage on pin 21 is 3.6V to 6.0V:EP; when 1.8V to 2.6V:LP; when 0V to 1.8V:SP Switch On Pin Number EP mode:4,5,16 LP mode:16 16 21 Power supply of each circuit block Ripple rejection is performed when connected to GND through an electrolytic capacitor for the filter. Continued to next page. No.4091-6/7 LA7285, 7285M Continued from proceeding page. Pin No. Function name Unit (resistance:Ω) Internal circuit for pin Description of function 22 LINE/TUNER/PB Control When the voltage on pin 22 is 3.6V to 6.0V:LINE; when 1.8V to 2.6V:TUNER when 0V to 1.0V:PB 23 MUTE Control When the voltage on pin 23 is 2.5V to 6.0V:MUTE on; when 0V to 1.5V:MUTE off 24 REC/EE Control When the voltage on pin 24 is 2.5V to VCC:REC; when 0V to 1.0V:EE No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibilty for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of May, 1998. Specifications and information herein are subject to change without notice. PS No.4091-7/7