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| Ordering number: EN3535A Monolithic Linear IC LA4581MB Preamplifier + Power Amplifier for 3V Headphone Stereos Overview The LA4581MB is an auto reverse-supported preamplifier + power amplifier IC that is intended for use in 3V headphone stereos. Package Dimensions unit : mm 3112-MFP24S [LA4581MB] Features . Preamplifier muting and preamplifier output on/off can be . . . . implemented with one pin. This IC can easily be used to construct a set with a radio. The power amplifier needs no input/output coupling capacitor. A high-frequency cut capacitor is connected to the preamplifier input pin and the power amplifier input pin. (Anti-buzz provision) Because Vref AMP (r0 = 10 ) is built in, the virtual grounding impedance is about 10 . This eliminates the need for a large capacitor. 8 speaker drivable. SANYO : MFP24S Specifications Maximum Ratings at Ta = 25 C Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Conditions Ratings 4.5 530 -20 to +75 -40 to +125 Unit V mW C C Operating Conditions at Ta = 25 C Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCC op Conditions Ratings 3.0 1.8 to 3.6 Unit V V Operating Characteristics at Ta = 25 C, VCC = 3.0 V, f = 1 kHz, 0.775 V = 0 dBm, RL = 10 k (preamplifier), RL = 16 (power amplifier) Parameter [Pre + Power] Quiescent current Voltage gain (Closed) Symbol ICCO VGT Output Rg = 2.2 k (preamplifer) VIN = 0 V VO = -5 dBm min typ 17 68 max 27 71 Unit mA dB 65 Continued on next page. SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 22896HA(II) No.3535-1/8 LA4581MB Continued from preceding page. Parameter [Preamplifier] Voltage gain (Open) Voltage gain (Closed) Maximum output voltage Total harmonic distortion Equivalent input noise voltage Crosstalk Ripple rejection ratio [Power Amplifer] Output voltage Voltage gain (Closed) Total harmonic distortion Interchannel crosstalk Output noise voltage Ripple rejection ratio Input resistance DC offset voltage Symbol VGo VG1 VOmax THD1 VN1 CT1 Rr1 PO VG2 THD2 CTT VNO Rr2 RIN VODCoff Output VO = -5 dBm VO = -5 dBm THD = 1 %, VCC = 1.8 V VO = 0.2 V, VG = 40 dB/NAB Rg = 2.2 k, B.P.F = 20 to 20 kHz Rg = 2.2 k, TUNE 1 kHz Rg = 2.2 k, VCC = 1.8 V, Vr = -20 dBm, f = 100 Hz THD = 10% VO = -5 dBm PO = 1 mW VO = -5 dBm, Rv = 0 Rg = 0, B.P.F = 20 to 20 kHz Rg = 0, Vr = -20 dB, f = 100 Hz, VCC = 1.8 V Between 13-14 and 15 min 70 0.1 typ 80 40 0.2 0.05 1.3 80 50 32 28 0.4 40 24 60 30 max Unit dB dB V % V dB dB mW dB % dB V dB k mV 0.5 2.0 60 40 23 25 30 45 22 -90 31 1.0 40 38 +90 Note) Power amplifier voltage gain VG2 increases by about 1 dB for min/max respectively than specified above when RL = 32 . Block Diagram Test Circuit 1.8 to 3.0 V Unit (resistance: , capacitance: F) No.3535-2/8 LA4581MB Allowable power dissipation, Pd max - mW Ambient temperature, Ta - C Sample Application Circuit Preamplifier input is applied to pins 2,23/ pins 3,22 when SW ON/OFF, respectively. POWER MUTE ON when connected to GND. Note) Pre closed loop gain VG = 40 dB/1 kHz NAB PRE MUTE ON when connected to VCC 1.8 to 3.6 V Unit (resistance: , capacitance: F) Pin and external part functions (when the voltage is VCC = 3.0 V) Pin No. 1 2 PRE GND PRE IN1R 1.8 V v Turns ON when pin 17 is grounded. v A bias resistor (2.2 k) must be connected between pin 2 and pin 24 (Vref) when no head is in use. PRE IN1F 1.8 V v Turns ON when pin 17 is floating. v A bias resistor (2.2 k) must be connected between pin 3 and pin 24 (Vref) when no head is in use. PRE NF1 1.8 V PRE OUT1 1.8 V v Like pin 6, 10 k load drivable. SW OUT1 1.8V v Provides PRE AMP1 output when pin 8 is floating (PRE MUTE OFF)(equivalent to pin 5). v Disconnects from PRE AMP1 and sets RIN ^ 500 k when pin 8 is at VCC (PRE MUTE ON). POWER IN1 1.8V v Input resistance RIN 7 30 k Pin Function 3 4 5 6 7 Continued on next page. No.3535-3/8 LA4581MB Continued from preceding page. Pin No. 8 Pin Function PRE MUTE v When VCC is applied, PRE MUTE ON. v MUTE ON conditions: V8IN ^ VCC - 0.2 V, inflow current I7 7 60 A (when VCC = 3 V) Ripple Filter REF 2.7 V(C7 = 2.2 F to 33 F) v Ripple Filter, Vref reference v The Vref ripple rejection ratio worsens when C7 is made smaller. v Rr is 55 dB for 22 F; 35 dB for 2.2 F. Ripple Filter OUT 2.7 V v Ripple rejection ratio: Rr is 38 dB when C7 = 22 F; 30 dB when C7 = 2.2 F. v Outflow current I7 max = 1 mA VCC 3.0 V POWER GND COMMON 1.2 V POWER OUT1 1.2 V v CH1 output. POWER OUT2 1.2 V v CH2 output POWER MUTE 0.7 V (C10 = 1.0 F to 4.7 F) v When connected to GND: POWER MUTE ON. v MUTE ON conditions: V16 % 0.3 V, outflow current I16 7 2.5 A. v C10 can be used to control MUTE TIME. v When C10 = 2.2 F, VCC =3.0 V 0.7 sec. FWD/REV SW (C11 % 0.47 F) v When connected to GND, PRE IN1R (pin 2) and IN2R (pin 23) turn on. v When floating, PRE IN1F (pin 3) and IN2F (pin 22) turn on. v C11 and R7 are intended for smoothing at the time of switching. v REV condition: V17 % 0.2 V. POWER IN2 1.8 V v Input resistance RIN 7 30 k SW OUT2 1.8 V v Provides PRE AMP2 when pin 8 is floating (PRE MUTE OFF) (equivalent to pin 20). v Disconnects from PRE AMP2 and RIN ^ 500 k when pin 8 is VCC (PRE MUTE ON). PRE OUT2 1.8 V v Like pin 19, 10 k load drivable. PRE NF2 1.8V PRE IN2F 1.8 V v Turns on when pin 17 is floating. v A bias resistor (2.2 k) must be connected between pin 22 and pin 24 (Vref) when no head is in use. PRE IN2R 1.8 V v Turns on when pin 17 is connected to GND. v A bias resistor (2.2 k) must be connected between pin 23 and pin 24(Vref) when no head is in use. Vref 1.8 V v The reference voltage is set to 3/5 x VCC. Because Vref AMP (rO 7 10 ) is built in, C17 can be made smaller (1 F). v Inflow/outflow current I24 = 500 A available. 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Sample Application: Radio set application. As shown above, Radio on and Pre Mute can be implemented with one-circuit switch. No.3535-4/8 LA4581MB IC Usage Notes 1. The power amplifier outputs and the common amplifier output are connected through resistors of about 60 . The resistors are for common amplifier oscillation blocking. 2. 3. The preamplifier muting function isolates the preamplifier outputs from SW OUT. The preamplifier is on even when the preamplifier muting is on. If transient noise is noticeable when the power supply is turned off, add the external circuit described below. Transient noise when the power is turned off can be improved by rapidly applying the power amplifier muting. However, the standby current IST flows even when the power switch is off IST = (VCC - VBE)/600 k When VCC = 3.0 V IST = (3.0 - 0.6)/600 k 7 4 A Unit (resistance: , capacitance: F) Internal equivalent circuit for each SW pin. 4. . Pre-mute MUTE ON condition : V8IN ^ VCC - 0.2 V Inflow current : I8 7 60 A (when VCC = 3.0 V) . Power mute Unit (resistance: ) MUTE ON condition : V16 % 0.3 V Outflow current : I16 7 2.5 A . F/R SW Unit (resistance: , capacitance: F) REV condition : V17 % 0.2 V Unit (resistance: , capacitance: F) No.3535-5/8 LA4581MB Pre + Power Preamp Quiescent current, Icco - mA Voltage gain, VG - dB Unit (resistance: , capacitance: F) Supply voltage, VCC - V Preamp Preamp Frequency, f - Hz Supply voltage, VCC - V [Interchannel] Maximum output voltage, Vomax - V Preamp Preamp Total harmonic distortion, THD - % Voltage gain, VGo - dB Output voltage, Vo - V Crosstalk, CT - dB 79 dB at tune 1 kHz The base correction turns off, causing output DC to increase, and output is obtained. Supply voltage, VCC - V [Between F/R] Preamp 89 dB at tune 1 kHz Frequency, f - Hz Output noise voltage, VNO - F Crosstalk, CT - dB equivalent equivalent Preamp ch1, ch2 equivalent Frequency, f - Hz Supply voltage, VCC - V No.3535-6/8 LA4581MB amp amp Drops because of 1 F at 5 kH or more when impedance is small. Unit (resistance: , capacitance: F) Reference voltage, Vref - V Output voltage, Vo - dBm Virtual grounding inflow current is I = 500 A max. Frequency, f - Hz Power amp Output current, Io - mA DC voltage, VDC - V DC voltage, VDC - V (Vitrual Grounding) Supply voltage, VCC - V Power amp Supply voltage, VCC - V Power amp Maximum output voltage, VO - V Voltage gain, VG - dB When both channels output simultaneously Supply voltage, VCC - V Power amp When both channels output simultaneously Frequency, f - Hz Voltage gain, VG - dB Crosstalk, CT - dB Power amp When both channels output Supply voltage, VCC - V Frequency, f - Hz equivalent No.3535-7/8 LA4581MB When both channels output simultaneously Total harmonic distortion, THD - % Total harmonic distortion,THD - % Power amp Power amp When both channels output simultaneously Output voltage, PO - mW Power amp Supply voltage, VCC - V Total harmonic distortion, THD - % Power amp Output noise voltage, VNO - V When both channels output simultaneously Output power, PO - mW Supply voltage, VCC - V SVRR - dB SVRR - dB Preamp Power amp ch1 and ch2 OUT are equivalent Supply voltage, VCC - V 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 February, 1996. Specifications and information herein are subject to change without notice. No.3535-8/8 |
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