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Part: LA4802T
Category:
Description: 3 V MD Headphone Stereo Power Amplifier + Beep, Package : Msop
Company: Sanyo Semiconductor Corporation
Datasheet: Download LA4802T datasheet File size : 113 kB
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Datasheet text preview:
Ordering number : ENN6657
Monolithic Linear IC
LA4802T
Headphone Stereo Power Amplifier
Overview
The LA4802T is a headphone stereo power amplifier for portable CD and MD players. It features a high signal-tonoise ratio, a high ripple rejection ratio, low distortion, and low current drain.
Package Dimensions
unit: mm 3262-MSOP20
[LA4802T]
5.2
Functions
· · · · Headphone stereo power amplifier Power switch Muting switch Beep tone function control input pin (The beep tone function can be used regardless of whether the mute function is on or off.)
20
11
4.4
6.3
1
(0.35) 0.5 0.2
10
0.125
· · · ·
High signal-to-noise ratio (100 dB typical at 7.5 µV) High ripple rejection ratio (70 dB typical) Low current drain (950 µA typical) On-chip bass compensation circuit (Compensates for bass frequency attenuation due to the o u t p u t capacitors and achieves flat frequency characteristics.) · Ultraminiature package (MSOP-20)
0.08
(0.65)
0.85max
Features
SANYO: MSOP20
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 When mounted, Ta = 80°C Conditions Ratings 4.5 375 20 to +80 40 to +150 Unit V mW °C °C
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
72502RM (OT) No. 6657-1/10
0.5
LA4802T Operating Conditions at Ta = 25°C
Parameter Recommended supply voltage Operating supply voltage range Recommended load resistance Symbol VCC VCC op RL Conditions Ratings 2.4 1.8 to 3.6 16 to 32 Unit V V
Electrical Characteristics at Ta = 25°C, VCC = 2.4 V, fIN = 1 kHz, RL = 16
Item Quiescent current Symbol ICCO1 ICCO2 ICCO3 Operating current drain Voltage gain Channel balance Output power Total harmonic distortion Output noise voltage Crosstalk Ripple rejection ratio Peak output voltage Muting attenuation Power on voltage sensitivity Power off voltage sensitivity Mute on voltage sensitivity Mute off voltage sensitivity Boost on voltage sensitivity Boost off voltage sensitivity ICC1 VG VG PO THD VNO CT SVRR VOBEEP VOFF V1 ON V1 OFF V20 ON V20 OFF V4 ON V4 OFF ICC2 THD2 VNO2 CT2 SVRR2 Conditions Current when ST is off (with L.B. on and muting off) Current when muting is on (with ST on and L.B. on) Current when ST is on (with L.B. on and muting off) PO = 0.1 mW (With 2 channels driven) VO = 10 dBm VO = 10 dBm THD = 10% VO = 8 dBm, 20 kHz LPF Rg = 10 k, IHF A TUN1kHz, VO = 10 dBm fr = 100 kHz, Vr = 20 dBm, TUN100Hz VIN = 2.4 Vp-p, f = 1 kHz, MUTE OFF THD = 1%, TUN1kHz Power on threshold voltage Power off threshold voltage Muting on threshold voltage Muting off threshold voltage Boost on threshold voltage Boost off threshold voltage 1.4 1.4 0.5 0.5 70 60 1.0 100 1.6 0.5 6.8 1 25 Ratings min typ 0.05 530 950 3.2 7.8 0 38 0.03 100 80 70 2.7 120 0.1 90 max 1 900 1500 3.7 8.8 +1 Unit µA µA µA mA dB dB mW % dBm dB dB mV dB V V V V V V
Ta = 25°C, VCC = 2.7 V, fIN = 1 kHz, RL = 47 k (Characteristics when used as a line output), L.B OFF Operating current drain Total harmonic distortion Output noise voltage Crosstalk Ripple rejection ratio VO = 0 dBm (With 2 channels driven) VO = 0 dBm, 20 kHz LPF Rg = 10 k, IHF A TUN1kHz, VO = 10 dBm fr = 100 kHz, Vr = 20 dBm, TUN100Hz 80 65 1.5 0.005 100 90 78 2.0 0.05 90 mA % dBm dB dB
Switch Threshold Voltages and Pin Influx Currents · Standby switch (pin 1)
Pin influx current (µA)
H : IC ON L : IC OFF 120 100 80 60 40 20 0 0
L
H
1
2 V1 (V)
3
4
5
· Mute switch (pin 20), boost switch (pin 4)
Pin influx current (µA)
H : MUTE ON, L. B OFF L : MUTE OFF, L. B ON
40 30 20 L H
0 0 1 2 3 V20, V4 (V) 4 5
No. 6657-2/10
LA4802T Notes on the Beep Tone Output Function · This function provides a beep tone output under control of the system microcontroller. · The beep tone can be provided regardless of the on/off state of the muting function. · The recommended beep input signal level is a square wave with VIN = 2.4 Vp-p. When the muting function is off, the beep tone output, VOBEEP, will be 2.7 V rms, and when muting is on, the output will be 1.3 Vrms. Notes on the Muting Time · The muting on time and the muting off time can be modified by changing the value of the external capacitor C4 connected to pin 6. The recommended value for C4 is 1 µF. With lower values, impulse noise levels will increase. · The on/off times will change as shown below when the value of C4 is varied.
C4 0.1 µF 0.47 µF 1 µF On time 0.2 ms 1 ms 2 ms Off time 9 ms 40 ms 80 ms
· We recommend operating the mute switch at the same time as the power on/off switch (pin 1) to minimize impulse noise at power on and off.
VCC
MUTE S. W
PWR S. W A13553
Notes on the Bass Compensation Circuit · When the headphone load is connected to the output, the low frequencies will be attenuated due to the output capacitors. This circuit compensates for that attenuation and creates frequency response characteristics that are close to flat. · This function can be turned on or off from pin 4. When used as a line output, the load will be less than 16 , and the bass frequency characteristics will be somewhat increased. Therefore we recommend leaving the bass compensation circuit off in this case. VG -- f
2
+ Voltage gain, VG -- dB
0 2 4 6 8 10 12 14
Output pin
Load terminal
A13554
16 10
No
bas s co
100
mp
ens atio
Bas
s
n
pe com
nsat
ion
ap
d plie
1000
1k
10k
Frequency, f -- Hz
No. 6657-3/10
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