LM48821 Texas instruments

LM48821

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LM48821

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Описание

With its directly-coupled output technology, the LM48821 is a variable gain audio power amplifier capable of delivering 52mWRMS per channel into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply. The I2C volume control has a range of –76dB to 18dB. The LM48821's Tru-GND technology utilizes advanced charge pump technology to generate the LM48821’s negative supply voltage. This eliminates the need for output-coupling capacitors typically used with single-ended loads. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM48821 does not require output coupling capacitors or bootstrap capacitors, and therefore, is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM48821 incorporates selectable low-power consumption shutdown and channel select modes. The LM48821 contains advanced output transient suppression circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions.

Ground Referenced Outputs
Differential Inputs
I²C Volume and Mode Controls
Available in Space-Saving DSBGA Package
Ultra Low Current Shutdown Mode
Advanced Output Transient Suppression Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions
2.0V to 4.0V Operation (PV_DD and SV_DD)
1.8 to 4.0V Operation (I²CV_DD)
No Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors, or Gain-Setting Resistors Required

Key Specifications

Improved PSRR at 217Hz: 82dB (typ)
Stereo Output Power at VDD = 3V, RL = 16Ω, THD+N = 1%: 52mW (typ)
Mono Output Power at VDD = 3V, RL = 16Ω, THD+N = 1%: 93mW (typ)
Shutdown current: 0.1μA (typ)

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Output power (W)	0.053
Analog supply (min) (V)	2
Analog supply (max) (V)	4
Load (min) (Ω)	16
PSRR (dB)	82
Rating	Catalog
Operating temperature range (°C)	-40 to 85
Headphone channels	Stereo
Volume control	Yes
Shutdown current (ISD) (µA)	0.1
Architecture	Class-AB (ground-centered)
Iq per channel (typ) (mA)	1.5