Document
LM4753 Dual 10W Audio Power Amplifier w/Mute, Standby and Volume Control
June 1999
LM4753 Dual 10W Audio Power Amplifier w/Mute, Standby and Volume Control
General Description
The LM4753 is a stereo audio amplifier capable of delivering 10W/channel at 10% distortion into a 8Ω load. The power amp has an internally set gain of 30 dB. A 0V–5V DC controlled volume block provides 80 dB of attenuation from input to line-out. Line outputs are available after the volume control for signal routing. The amplifier has a smooth transition fade-in/out mute and a power conserving standby function which are controlled through TTL or CMOS logic. Both functions provide over 75 dB of attenuation. The LM4753 maintains an excellent Signal-to-Noise ratio of greater than 70 dB with a low noise floor less than 2 mV. The IC also maintains above 50 dB of channel separation. The LM4753 is available in a 15-lead non-isolated plastic package and is designed for use in TV applications requiring single supply operation.
Key Specifications
n n n n n n n Output power into 8Ω at 10% THD 10W Maximum operating voltage 28V Power output stage Noise floor 2 mV Line output Noise floor 55 µV 0V–5V DC controlled volume attenuation 80 dB Mute attenuation 75 dB Standby-mode supply current 7 mA
Features
n n n n Quiet fade-in/out mute function Stereo variable line-out pins AC output short circuit protection Thermal shutdown protection
Applications
n Stereo TVs n Component stereo n Compact stereo
Typical Application
DS100043-1
FIGURE 1. Typical Audio Amplifier Application Circuit
© 1999 National Semiconductor Corporation
DS100043
www.national.com
Connection Diagram
Plastic Package
DS100043-2
Top View Order Number See NS Package Number TA15A for Staggered Lead Non-Isolated Package
www.national.com
2
Absolute Maximum Ratings (Notes 3, 4)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Output Current Power Dissipation (Note 5) ESD Susceptibility (Note 6) ESD Susceptibility (Note 7) Junction Temperature 32V Internally Limited 22W 2000V 250V 150˚C
Soldering Information T Package (10 sec) Storage Temperature Input Signal Voltage Range 260˚C −40˚C to +150˚C
± 3V
Operating Ratings (Notes 3, 4)
Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage θJA (Junction to Ambient) θJC (Junction to Case) −40˚C ≤ TA ≤ +85˚C 15V to 28V 35˚C/W 1.5˚C/W
Electrical Characteristics (Notes 3, 4) The following specifications apply for VCC = +22V, and Volume @ 0 dB unless otherwise specified. Limits apply for TA = 25˚C.
LM4753 Symbol ICQ (Note 1) ISTBY (Note 1) IMUTE AM (Note 2) Parameter Total Quiescent Power Supply Current Standby Current Mute Current Mute Attenuation Conditions VCM = 0V, Vo = 0V, Io = 0 mA 80 VSTDBY = 5V, Standby-on VMUTE = 5V Mute-on VMUTE = 5V, VSTDBY = 0V. Mute-on Signal Input VMUTE = 0V. VSTDBY = 0V. Mute-off 2 Vrms Volume Attenuation Range Volume Absolute Attenuation Line-out Line-out Offset Voltage PO (Note 1) THD+N (Note 2) Xtalk (Note 2) SR (Note 2) RIN (Note 1) IO (Note 1) PSRR (Note 2) GBWP eVCAout eout SNR Output Power (Continuous Average) THD+N = 10% (max) f = 1 kHz, RL = 8Ω, VCC = 28 f = 1 kHz, RL = 8Ω, VCC = 22V Total Harmonic Distortion Plus Noise Channel Separation Power Amp Closed-Loop Gain Error Slew Rate Input Impedance Output Current Limit Power Supply Rejection Ratio Gain-Bandwidth Product Power Bandwidth VCA Output Noise Power Amp Output Noise Signal-to-Noise Ratio VIN = 100 mV DC, tON = 1 ms, RL = 1Ω Vpin 13 AC = 1 Vrms, f = 100 Hz VCM = 0V, Io = 0 mA fo = 100 kHz, VIN = 50 mvrms −3 dB Bandwidth at 5W IHF - A Weighting Filter RIN = 25Ω IHF - A Weighting Filter RIN = 25Ω Measured at 1 kHz, Rs = 25Ω Po = 4.8W, A - Weighted,
3
Typical (Note 8)
Limit (Note 9) 20 140 10 20 60
Units (Limits) mA (min) mA (max) mA (max) mA dB (min) dB
7 13 75
±5
80 70
dB (min) dB (max) mV (max) W
Pin 3 @ 0V = 80 dB, 2V = 14 dB, 3V = 8 dB, 4V = 3 dB, 5V = 0 dB
±3
20 11.8 7 0.4 50 0.5 3 32 2.5 50 2 90 55 1.8
±5
40
6.5 1
W(min) % (max) dB
Po = 1W, f = 1 kHz, RL = 8Ω f = 1 kHz, Po = 5W, RL = 8Ω Internal Gain = 30 dB VIN = 100 mVp-p, tRISE = 2 ns, RL = 8Ω
±1
dB (max) V/µs kΩ
2.0
A(min) dB MHz kHz µV mV
70
dB
www.national.com
Electrical Characteristics (Notes 3, 4)
(Continued)
The following specifications apply for VCC = +22V, and Volume @ 0 dB unless otherwise specified. Limits apply for TA = 25˚C. LM4753 Symbol Standby VIL VIH Mute VIL VIH Mute Low Input Voltage Mute High Input Voltage 0.8 2.0 V (max) V (min) Standby Low Input Voltage Standby High Input Voltage 0.8 2.0 V (max) V (min) Parameter Conditions Typical (Note 8) Limit (Note 9) Units (Limits)
Note 1: DC Electrical Test. Note 2: AC Electrical Test. Note 3: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific p.