Ordering number: EN 2620C Monolithic Linear IC LA3242 Preamplifier for Compact Cassette Recorder Recording-only Use Overview Package Dimensions The LA3242 is a preamp IC for compact cassette recorder recording-only use. The distinctive feature of the LA3242 is that it contains mechanical switches which have been so far connected externally as peripheral parts. unit : mm 3067-DIP24S [LA3242] Features . On-chip electronic select switches permitting selection of . . . . . normal/higher speed recording and metal(chrome)/normal tape recording mode by using the dedicated control pins. Two ALC output pins making it easy to make up a Dolby recording system. The control voltage from a microcomputer, etc. can be used to turn ON/OFF the ALC and to set the ALC control voltage to the initial value. On-chip microphone amplifier making it easy to provide microphone mixing. Wide operating voltage range (VCC = 4.5 to 14.0 V). Can be used in conjunction with playback-only preamp LA3246 to make up a double-cassette dubbing system. SANYO : DIP24S Functions . Recording preamplifier . Microphone amplifier . ALC output . Electronic switch ×2 ×1 ×2 ×6 Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Allowable power dissipation Symbol Conditions Ratings Unit VCC max 16 V Pd max 720 mW Operating temperature Topr –20 to +75 °C Storage temperature Tstg –40 to +125 °C Ratings Unit Operating Conditions at Ta = 25°C Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions 6 V 4.5 to 14.0 V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN D3097HA(II)/N257TA/7027TA,TS No.2620-1/12 LA3242 Operating Characteristics at Ta = 25°C, VCC = 6.0 V, RL = 10 kΩ, f = 1 kHz, 0 dB = 0.775 V Parameter Quiescent current Quiescent current [REC Amp] Voltage gain (Open) Voltage gain (Closed) Total harmonic distortion Maximum output voltage Equivalent input noise voltage Input resistance Crosstalk Channel balance [Microphone Amp] Voltage gain (Open) Voltage gain (Closed) Total harmonic distortion Maximum output voltage Equivalent input noise voltage Input resistance Crosstalk [ALC] ALC range Conditions Me/Nor, Nor/High SW OFF Me/Nor, Nor/High SW ON VGO1 VG1 THD 1 VO max VO = 0 dBm VO = 0.4 V THD = 1% VNI1 Rg = 2.2 kΩ, B.P.F = 20 Hz to 20 kHz RI1 CT1 CT2 VBL Between REC amps REC amp→Microphone amp VIN = –50 dBm VGO2 VG2 THD2 VO max VO = 0 dBm VO = 0.4 V THD = 1% VNI2 Rg = 2.2 kΩ, B.P.F = 20 Hz to 20 kHz RI2 CT3 Microphone amp→REC amp ALCW ALC balance ALC distortion ALC output voltage Crosstalk Crosstalk ALC ON-state voltage ALC OFF-state voltage [Switch] ON-state resistance DC feedback resistance Allowable power dissipation, Pd max – mW Symbol ICCO ICCS ALCB ALCTHD ALCVO CT4 CT5 ALCon ALCoff Input range when output distortion becomes 1% after ALC begins to the applied. Output difference between CH1 and CH2 VIN = –40 dBm VIN = –40 dBm Between REC amps REC amp→Microphone amp Voltage on pin 17 Voltage on pin 17 RON RF1 min 5 12 typ 7.5 16 max 12 20 Unit mA mA 75 42.5 85 44.5 0.1 1.0 46.0 0.7 dB dB % V 1.1 1.7 µV 50 60 75 0 60 kΩ dB dB dB 0.7 40 50 50 60 23 2 70 25 0.05 1.1 27 0.5 dB dB V V 1.1 1.7 µV 40 45 50 60 60 kΩ dB 40 45 0.33 45 50 0 0.15 0.42 60 70 0.8 dB 2 0.8 0.53 1.0 1.5 40 30 50 70 60 dB % V dB dB V V Ω kΩ Pd max – Ta Ambient temperature, Ta – °C No.2620-2/12 LA3242 Equivalent Circuit Block Diagram Top view Equivalent Circuit No.2620-3/12 LA3242 Sample Application Circuit Note: 1. 2. 3. 4. 5. 6. The electronic select switching level is approximately (VCC – 0.9)/2. REC amplifier NF parameters Z1 through Z3 should be selected to accommodate the recording level and frequency response that will be required in metal/normal tape and normal/higher speed modes. Z1 through Z3 may be configured with coil ‘‘L’’, capacitor ‘‘C’’, and resistor ‘‘R’’. When electronic control pins 9 and 16 are at the GND level, each electronic switch is turned ON. When ALC ON/OFF control pin 17 is at 1 V or less/1.5 V or greater, the ALC is turned ON/OFF, respectively (Ta = 25°C). The ALC width depends on external resistor RA. No.2620-4/12 LA3242 Test Circuit Sample Printed Circuit Pattern (Cu-foiled area) 2 130 × 130 mm Unit (resistance: Ω, capacitance: F) No.2620-5/12 LA3242 IC usage Notes (1) The base of a PNP transistor is connected to input pins 2 and 23. When a voltage is applied to input pins 2 and 23 externally, connect a capacitor to the input pins. The recommended value of capacitor C is 0.1 µF to 10 µF. DC voltage VINDC with input pins 2 and 23 open is 50 mV max (VINDC = 20 mV typ). For the relation between supply voltage VCC and VINDC, refer to the VCC – VINDC characteristic. (2) Output waveform starting time (Refer to Data ts – Cr.) Rise waveform at pin 7 or 18 When supply voltage VCC is switched ON, the amplifier output (pins 7 and 18) will rise. Output waveform ON time ts can be varied by capacitor Cr connected to pin 12. The minimum value of Cr is 33 µF. If the value of Cr is made less than 33 µF, more pop noise will occur and the ripple rejection will worsen at the time supply voltage VCC is switched ON. (ts = 0.7 s. typ at Cr = 100 µF) (3) Electronic switch control circuit The control circuit for control pins 9 and 16 is configured as shown left. Control pin Electronic SW ON signal Control level VCONT of the control circuit is given by: VCONT = 1/2 × (VCC – 0.9) [V] . 4 µAmin (4) Relation between control voltage to turn ON/OFF electronic switch and supply voltage (Refer to Data VCONT – VCC.) Electronic SW OFF Electronic SW ON The control level at electronic switch CONT pin 9 and 16 is fixed by supply voltage VCC. The threshold region has a range of approximately 1 V. The middle point of threshold region at a given value of supply voltage VCC is represented by approximately 1/2 × (VCC – 0.9) V. The electronic switch can be turned ON/OFF by applying a voltage of the middle point voltage ±0.5 V or more/less, respectively, to electronic switch CONT pins 9 and 16. Threshold region (. 1 V) No.2620-6/12 LA3242 (5) ALC control pin and ON/OFF level The ALC ON/OFF control circuit is configured as shown left. When a voltage of (VBE1+VBE2) = 1.5 V or greater is applied to the ALC CONT17, the potential on the ALC IN (pin 8) drops to GND level. The ALC is turned OFF (ALC function release). Threshold region REC amplifier output VOAC is controlled by the ALC CONT voltage and the threshold region has a range of approximately 0.5 V. The ALC CONT voltage is set to 1.0 V or less/1.5 V or greater to turn ON/OFF the ALC, respectively. (Refer to Data VOAC, V8, I1 – VALC VGO, VG – fIN Voltage gain (Open), VGO – dB Voltage gain (Closed), VG – dB Voltage gain (Open), VGO – dB Voltage gain (Closed), VG – dB VGO, VG – fIN Either Me/Nor or Nor/High On Input frequency, fIN – Hz Input frequency, fIN – Hz ICCO, ICCS – VCC VG – VCC Voltage gain, VG – dB Quiescent current, ICCO – mA Quiescent current, ICCS (Electronic SW ON) – mA CONT.) Supply voltage, VCC – V Supply voltage, VCC – V No.2620-7/12 ALC output voltage, VOALC – dB Output voltage, VO – V Total harmonic distortion, THD – % Output voltage, VO – V Total harmonic distortion, THD – % Output voltage, VO –V Total harmonic distortion, THD – % Output voltage, VO – V Total harmonic distortion, THD –% Maximum output voltage, VO max – V Crosstalk, CT – dB Output voltage, VO – V Total harmonic distortion, THD – % LA3242 VO, THD – VIN Input voltage, VIN – dBm CT – VCC Input voltage, VIN – dBm VO max – VCC Supply voltage, VCC – V VO, THD – VIN Supply voltage, VCC – V VO, THD – VIN Input voltage, VIN – dBm VO, THD – VIN Input voltage, VIN – dBm VO, THD – VIN Pin 17 Input voltage, VIN – dBm VOALC – VCC Supply voltage, VCC – V No.2620-8/12 Output noise voltage, VNO – µV (VCC = 6 V) Output noise voltage, VNO – µV Supply voltage, VCC – V VNO – Rg Input signal source resistance, Rg – Ω VO max – RL Supply voltage, VCC – V VNI – Rg Input signal source resistance, Rg – Ω VO max – VCC Maximum output voltage, VO max – V Maximum output voltage, VO max – V VNO – VCC VNI – VCC Equivalent input noise voltage, VNI – µV Equivalent input noise voltage, VNI – µV LA3242 Supply voltage, VCC – V VG – VCC Voltage gain, VG – dB Output voltage, VO – V Total harmonic distortion, THD – % Load resistance, RL – Ω VO, THD – VIN Input voltage, VIN – dBm Supply voltage, VCC – V No.2620-9/12 VNI – VCC Supply voltage, VCC – V CT – fIN Crosstalk, CT – dB Supply voltage, VCC – V VNI – Rg Input signal source resistance, Rg – Ω CT – fIN Input frequency, fIN – Hz CT – fIN Crosstalk, CT – dB Crosstalk, CT – dB Equivalent input noise voltage, VNI – µV Output noise voltage, VNO – µV VNO – VCC Equivalent input noise voltage, VNI – µV LA3242 Input frequency, fIN – Hz CT – fIN Crosstalk, CT – dB Crosstalk, CT – dB Input frequency, fIN – Hz CT – fIN Input frequency, fIN – Hz Input frequency, fIN – Hz No.2620-10/12 LA3242 Rr – fR Ripple rejection ratio, Rr – dB Ripple rejection ratio, Rr – dB Rr – VCC Ripple frequency, fR – Hz ICCO – Ta Voltage gain, VG – dB Value of capacitor for ripple filter, Cr – µF VG – Ta From the top: Maximum output voltage, VO max – V Quiescent current, ICCO – mA Ripple rejection ratio, Rr – dB Supply voltage, VCC – V Rr – Cr Ambient temperature, Ta – °C VO max – Ta Maximum output voltage, VO max – V Maximum output voltage, VO max – V Ambient temperature, Ta – °C VO max – Ta Ambient temperature, Ta – °C VO max – Ta Ambient temperature, Ta – °C Ambient temperature, Ta – °C No.2620-11/12 LA3242 VCONT – VCC Electronic SW ON Electronic SW ON (Make) Thrshold region Output voltage, VOAC – V Residual voltage(Pin 8), V8 – V Control voltage(pin 16), VCONT – V Electronic SW OFF Electronic SW OFF (Break) Supply voltage, VCC – V VOAC, V8, I – VALC CONT Ambient temperature, Ta – °C VCONT – VCC Control voltage VCONT on pin 16 and pin 16-controlled electronic SW ON/OFF characteristic Control voltage VCONT on pin 9 and pin 9-controlled electronic SW ON/OFF characteristic Bias current, I – µA DC voltage, VDAC, V17 – V Control voltage (Pin 9), VCONT – V VDAC, V17 – Ta Threshold region ALC control voltage, VALC VIN DC – VCC CONT –V Input DC voltage, VIN Starting time, ts – s DC – mV Supply voltage, VCC – V ts – Cr Value of capacitor for ripple filter (Pin 14), Cr – µF Supply voltage, VCC – V 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: 1 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: 2 Not impose any responsibility 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 December, 1997. Specifications and information herein are subject to change without notice. No.2620-12/12