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LM4921

National Semiconductor
Part Number LM4921
Manufacturer National Semiconductor
Description Low Voltage I2S 16-Bit Stereo DAC
Published Mar 22, 2005
Detailed Description LM4921 Low Voltage I2S 16-Bit Stereo DAC with Stereo Headphone Power Amplifiers and Volume Control November 2004 LM492...
Datasheet PDF File LM4921 PDF File

LM4921
LM4921


Overview
LM4921 Low Voltage I2S 16-Bit Stereo DAC with Stereo Headphone Power Amplifiers and Volume Control November 2004 LM4921 Low Voltage I2S 16-Bit Stereo DAC with Stereo Headphone Power Amplifiers and Volume Control General Description The LM4921 combines a 16-bit resolution stereo I S input digital-to-analog converter (DAC) with a stereo headphone audio power amplifier.
It is primarily designed for demanding applications in mobile phones and other portable communication device applications.
The LM4921 features an I2S serial interface for the digital audio information and a 16-bit SPI serial interface for internal register control and communication.
With AVDD and DVDD = 3.
0VDC and driving a 32Ω single-ended load to a 26mWRMS output level the distortion (THD+N) of the LM4921 will be less than 0.
5%.
The LM4921 also features a programmable 32-step digital volume control accessed through an SPI interface.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components.
It is, therefore, ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.
The LM4921 features a low-power consumption shutdown mode, and also has an internal thermal shutdown protection mechanism.
2 Key Specifications j PSRR at 217Hz, A/DVDD = 3V, (Fig.
1) j POUT at AVDD = 3.
0V, 32Ω 52dB (typ) 13mW (typ) 26mW (typ) 2.
6V to 5.
0V 2.
6V to 5.
5V 1µA (typ) < 0.
05% THD < 0.
5% THD j Supply voltage range DVDD AVDD (Note 8) j Shutdown current Features n n n n n n n n n n 16-bit resolution stereo DAC I2S digital audio data serial interface SPI serial interface (control register) Volume Control (32 steps; 1.
5 dB increments) Up to 50mW/channel stereo headphone amplifier Zero Crossing Detection for Silent Attenuation Steps 2.
6VDC to 5.
0VDC digital supply voltage range 2.
6VDC to 5.
5VDC analog supply voltage range (Note 8) Unity-gain stable headphone amplifiers Available in th...


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