LA4800

Ordering number: EN4335A Monolithic Linear IC LA4800V 3 V Stereo Headphone Power Amplifier Overview 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. Package Dimensions 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 L SANYO : SSOP16 Specifications Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Power dissipation Operating temperature range Storage temperature range Symbol VCC max Pd max Topr Tstg Conditions Ratings 4.5 375 –15 to 50 –40 to 150 Unit V mW °C °C Recommended Operating Ranges at Ta = 25°C Parameter Supply voltage Load resistance Operating supply voltage range Symbol VCC RL VCC op Conditions Ratings 3.0 16 to 32 1.8 to 3.6 Unit V Ω 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 ICCO2 ICCO3 Voltage gain Channel balance Output power Total harmonic distortion Output noise voltage Crosstalk Ripple rejection 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 VG VRL PO THD VNO CT R.R VOFF VO BEEP VDC OFF l1 ON V1 OFF l16 OFF V16 OFF V16 ON Conditions IC OFF Mute ON No input signal 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 min typ 0.05 1.6 (1.65) 6.2 (6.8) 11.8 0 25 0.075 7.8 45 76 –96 3.0 0 50 0.6 4.5 1.25 0.9 max 1.0 3.0 9.0 13.3 1 0.2 15 Unit µA mA mA dB dB mW % µV dB dB dB mV mV µA V µA V V Quiescent supply current 35 65 –80 1.5 –20 0.5 1.0 20 60 6.0 1.5 1.0 Maximum power dissipation, Pd max − mW 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 Pin number Pin name VDC (V) Unit (resistance: Ω) Equivalent circuit Pin description 1 PWR SW 0 to 0.7 Power switch Turns ON the power to the VCC pin. 2 IN A 1.1 Power input pins 10 kΩ input resistance 4 IN B 3 IN C 1.1 Power amplifier common input pin Usually connected to Vref Continued on next page. No.4335-4/11 LA4800V Continued from preceding page. Pin number Pin name VDC (V) Unit (resistance: Ω) Equivalent circuit Pin description F 5 VREFOUT 1.1 1.1 V fixed bias 6 PRE GND Preamplifier ground 7 VREFCONT 1.1 1.1 V reference control pin 8 RF OUT 2.2 F Preset to approximately VCC × 0.88 V 9 Beep IN 1.1 Beep tone input pin Active only when mute is ON. 10 RF CONT 2.2 to RF RF control pin 11 VCC Power supply 12 13 15 OUT B OUT C OUT A 1.1 1.1 1.1 Power output pins Pin 13 is the headphone center common drive. (No electrolytic capacitors required) 14 PWR GND Power amplifier ground 16 MUTE SW 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 C5, C4 C6 C8 C9, C10, C11 C12 R1, R2 R3, R4, R5 R6 Recommended value 1 to 4.7 µF 3.3 to 10 µF 4.7 to 10 µF 0.1 to 1 µF 220 µF 0.22 to 0.47 µF 0.1 to 1.0µF 0.5 to 4.3 Ω 100 kΩ 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 16Ω × VA For example, if RL = 16 Ω and VA = 0.5 V (VA is the adjusted input voltage on pin 9), VO = × 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. 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) 0.1 1.0 2.2 tS OFF(ms) 15 150 300 tS ON (ms) 3.2 30 56 No.4335-7/11 LA4800V Quiescent current, ICCO − mA Mute current, IMUTE − mA Voltage gain, VG − dB Channel 2 ON Ω Ω − µA Unit (capacitance: F) Supply voltage, VCC − V Total harmonic distortion, THD − % ICCO STBY Input frequency, fi − Hz Voltage gain, VG − dB B.P.F = 400 Hz to 80 kHz Channel 2 ON Supply voltage, VCC − V Total harmonic distortion, THD − % Input voltage, VIN − dBm Output power, PO − mW B.P.F = 400 Hz to 80 kHz Channel 2 ON Supply voltage, VCC − V Supply voltage, VCC − V Output noise voltage, VNO − µV Supply voltage, VCC − V Crosstalk, CT − dB Input frequency, fi − Hz No.4335-8/11 LA4800V Beep tone output voltage, VO Beep − mV Beep tone output voltage, VO Beep − mV Unit (resistance = Ω, capacitance = F) Input voltage, VIN − dB Beep tone output voltage, VO Beep − mV Ripple rejection ratio, SVRR − dB Input frequency, fi − Hz Mute OFF Mute ON Supply voltage, VCC − V Ripple rejection ratio, SVRR − dB Supply voltage, VCC − V tON, tOFF − s Unit (resistance = Ω) Supply voltage, VCC − V Mute ON/OFF threshold region Mute OFF (PWR ON) CMUTE − µF Mute OFF, 100kΩ, 1 µF (pin 16) Quiescent current, ICCO − mA Pin 16 voltage, VCONT16 − V Mute ON (PWR OUT = 80 dB) Supply voltage, VCC − V Ambient temperature Ta − °C No.4335-9/11 ICCO STBY − µA LA4800V Vref DC − Ta RL = 16Ω Headphone load DC voltage, Vref DC − V Voltage gain, VG − dB Ambient temperature, Ta − °C Ambient temperature, Ta − °C RL = 16 Ω Headphone load RL = 16 Ω Headphone load Voltage gain, VG − dB Ambient temperature, Ta − °C Beep tone output voltage, VO Beep − mV Voltage gain, VG − dB Ambient temperature, Ta − °C Beep tone voltage, VO Beep − mV (sine wave) (sine wave) Ambient temperature, Ta − °C Beep tone output voltage, VO Beep − mV 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