Ordering number: EN4335A Monolithic Linear IC LA4800V 3 V Stereo Headphone Power Amplifier Overview Package Dimensions The LA4800V is a headphone stereo power amplifier IC that features a high signal-to-noise ratio, high ripple rejection, low distortion and low current consumption, making it ideal for portable CD players. unit : mm 3178-SSOP16 [LA4800V] Functions . Headphone stereo power amplifier . Beep tone . Power switch . Power mute switch Features . 96 dB (typ) high S/N ratio at 7 µV . 76 dB (typ) high ripple rejection . 0.07% (typ) low distortion with R = 16 Ω . 6.2 mA (typ) low current consumption . Outputs do not require electrolytic capacitors. . Available in 16-pin SSOPs SANYO : SSOP16 L Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Power dissipation Symbol Conditions Ratings Unit VCC max 4.5 V Pd max 375 mW Operating temperature range Topr –15 to 50 °C Storage temperature range Tstg –40 to 150 °C Ratings Unit Recommended Operating Ranges at Ta = 25°C Parameter Symbol Supply voltage VCC Load resistance Operating supply voltage range Conditions 3.0 V RL 16 to 32 Ω VCC op 1.8 to 3.6 V SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 32896HA(II)/60393TS No.4335-1/11 LA4800V Operating Characteristics at Ta = 25°C, VCC = 2.5 V, RL = 16 Ω, f = 1 kHz unless otherwise noted. Values in parentheses indicate VCC = 3.0 V Parameter Symbol ICCO1 Quiescent supply current Voltage gain Channel balance Output power Total harmonic distortion Output noise voltage Crosstalk Mute ON ICCO3 No input signal R.R VOFF VO BEEP VDC OFF l1 ON V1 OFF l16 OFF V16 OFF V16 ON Maximum power dissipation, Pd max − mW Mute attenuation Beep tone output voltage Output DC offset voltage Power ON current sensitivity Power OFF voltage sensitivity Mute OFF current sensitivity Mute OFF voltage sensitivity Mute ON voltage sensitivity ICCO2 VG VRL PO THD VNO CT Ripple rejection Conditions min 35 typ 0.05 1.6 (1.65) 6.2 (6.8) 11.8 0 25 0.075 7.8 45 65 76 dB –80 1.5 –20 –96 3.0 0 50 0.6 4.5 1.25 0.9 dB mV mV µA V µA V V IC OFF VO = –10 dBm VO = –10 dBm VCC = 3.0 V, THD = 10% VO = 0.35 V Rg = 1 kΩ, DIN AUDIO f = 1 kHz, TUN, VO = –10 dBm VCC = 1.7 V, f = 100 Hz, VCR = –20 dBm, TUN = 100 Hz THD = 1% VI = –13.5 dBm (sine wave) VI = 0 V, Rg = 1 kΩ VCC = 1.7 V, V5 ^ 1.0 V VCC = 1.7 V, V5 % 0.1 V VCC = 1.7 V, V5 ^ 1.0 V VCC = 1.7 V VCC = 1.7 V 10.3 –1 15 0.5 1.0 max 1.0 Unit µA 3.0 mA 9.0 mA 13.3 1 dB dB mW % µV dB 0.2 15 20 60 6.0 1.5 1.0 Ambient temperature, Ta − °C No.4335-2/11 LA4800V Pin Assignment and Block Diagram Top view Unit (resistance: Ω) Test Circuit Unit (resistance: Ω, capacitance: F) No.4335-3/11 LA4800V Sample Application Circuit Signal from microcontroller Unit (resistance: Ω, capacitance: F) Pin Description VCC = 2.5 V Unit (resistance: Ω) Pin number Pin name VDC (V) 1 PWR SW 0 to 0.7 2 IN A 4 IN B 3 IN C Equivalent circuit Pin description Power switch Turns ON the power to the VCC pin. 1.1 Power input pins 10 kΩ input resistance 1.1 Power amplifier common input pin Usually connected to Vref Continued on next page. No.4335-4/11 LA4800V Continued from preceding page. Unit (resistance: Ω) Pin number Pin name VDC (V) 5 VREFOUT 1.1 6 PRE GND 7 VREFCONT 1.1 8 RF OUT 2.2 9 Beep IN 1.1 Beep tone input pin Active only when mute is ON. 10 RF CONT 2.2 RF control pin Equivalent circuit Pin description F 1.1 V fixed bias Preamplifier ground 1.1 V reference control pin F Preset to approximately VCC × 0.88 V to RF 11 VCC 12 13 15 OUT B OUT C OUT A 14 PWR GND 16 MUTE SW Power supply 1.1 1.1 1.1 Power output pins Pin 13 is the headphone center common drive. (No electrolytic capacitors required) Power amplifier ground 0 to 1.85 The mute pin is floating when ON, and tied to VCC through a 100 kΩ when OFF. No.4335-5/11 LA4800V External Components Description Components C1, C2 C3, C4 Recommended value 1 to 4.7 µF 3.3 to 10 µF C5, C4 4.7 to 10 µF C6 0.1 to 1 µF C8 C9, C10, C11 C12 R1, R2 R3, R4, R5 220 µF 0.22 to 0.47 µF 0.1 to 1.0µF R6 100 kΩ 0.5 to 4.3 Ω Description Input coupling capacitors Reference bias (VREF) decoupling capacitors Ripple filter capacitors. Increasing the capacitance also increases the distortion and the supply rise time at turn ON. Input coupling capacitor for the beep tone. Choose a value that does not attenuate the beep tone signal. Supply line coupling capacitor Oscillation damping capacitors. Film capacitors are recommended. Mute time setting capacitor. See the description in the Operating Notes. Beep tone input signal adjustment resistors. Follow the manufactures instructions. Power amplifier oscillation damping resistors. Mute OFF pin 16 bias setting resistor. The internal 300 kΩ resistor and this 100 kΩ resistor together set the mute switch (pin 16) threshold. Operating Notes Beep tone operating principle Signal from microcontroller Unit (resistance: Ω, capacitance: F) The design of the above when mute is ON (pin 16 open) is as follows: The output voltage VO as function of RL is VO = RL RL+ 3k+ 1k × VA For example, if RL = 16 Ω and VA = 0.5 V (VA is the adjusted input voltage on pin 9), 16Ω × 0.5 ≅ 2 mV 16Ω + 3k+ 1k The beep tone output voltage VO is determined by the above equation. However, the oscillation damping RC components are connected to the PWR output and hence these RC components will also influence the actual value of VO. When using the beep tone, the impedance of C10, connected to the common output (pin 13), must be greater than the impedance of C9 and C11, i.e. C10 must be greater than C9 and C11. VO = No.4335-6/11 LA4800V Mute time adjustment The mute ON/OFF switching waveforms are shown in the figure above. The settling time tS is determined by the capacitor Cr connected to pin 16. The recommended value of Cr is 1 µF. If the value used is less than 1 µF, pop noise will increase. The setting time for different values of Cr are shown in the table below. Cr (µF) tS OFF(ms) 0.1 15 tS ON (ms) 3.2 1.0 150 30 2.2 300 56 No.4335-7/11 Voltage gain, VG − dB Ω Ω Unit (capacitance: F) Input frequency, fi − Hz Voltage gain, VG − dB Total harmonic distortion, THD − % Supply voltage, VCC − V B.P.F = 400 Hz to 80 kHz Channel 2 ON Supply voltage, VCC − V Supply voltage, VCC − V Crosstalk, CT − dB Output noise voltage, VNO − µV B.P.F = 400 Hz to 80 kHz Channel 2 ON Input voltage, VIN − dBm Output power, PO − mW Supply voltage, VCC − V Total harmonic distortion, THD − % Channel 2 ON ICCO STBY − µA Quiescent current, ICCO − mA Mute current, IMUTE − mA LA4800V Supply voltage, VCC − V Input frequency, fi − Hz No.4335-8/11 Unit (resistance = Ω, capacitance = F) Beep tone output voltage, VO Beep − mV Input frequency, fi − Hz Ripple rejection ratio, SVRR − dB Beep tone output voltage, VO Beep − mV Input voltage, VIN − dB Supply voltage, VCC − V tON, tOFF − s Ripple rejection ratio, SVRR − dB STBY − µA Quiescent current, ICCO − mA Pin 16 voltage, VCONT16 − V Mute OFF (PWR ON) Supply voltage, VCC − V Unit (resistance = Ω) CMUTE − µF Mute ON/OFF threshold region Mute ON (PWR OUT = 80 dB) Mute ON Supply voltage, VCC − V Supply voltage, VCC − V Mute OFF, 100kΩ, 1 µF (pin 16) Mute OFF ICCO Beep tone output voltage, VO Beep − mV LA4800V Ambient temperature Ta − °C No.4335-9/11 LA4800V Voltage gain, VG − dB DC voltage, Vref DC − V Vref DC − Ta Ambient temperature, Ta − °C Ambient temperature, Ta − °C RL = 16 Ω Headphone load Voltage gain, VG − dB Voltage gain, VG − dB RL = 16 Ω Headphone load (sine wave) Ambient temperature, Ta − °C Ambient temperature, Ta − °C Beep tone output voltage, VO Beep − mV Beep tone voltage, VO Beep − mV Ambient temperature, Ta − °C Beep tone output voltage, VO Beep − mV RL = 16Ω Headphone load (sine wave) Ambient temperature, Ta − °C (sine wave) Ambient temperature, Ta − °C No.4335-10/11 LA4800V 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 March, 1996. Specifications and information herein are subject to change without notice. No.4335-11/11