LM4921ITLX Datasheet, PDF (1/26 Pages) Texas Instruments – LM4921 Low Voltage I2S 16-Bit Stereo DAC

LM4921
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LM4921
SNAS178E – JULY 2003 – REVISED MAY 2013
Low Voltage I²S 16-Bit Stereo DAC with Stereo
Headphone Power Amplifiers and Volume Control
Check for Samples: LM4921
FEATURES
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•2 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
• 2.6V_DC to 5.0V_DC Digital Supply Voltage Range
• 2.6V_DC to 5.5V_DC Analog Supply Voltage Range
(See ⁽¹⁾)
• Unity-Gain Stable Headphone Amplifiers
• Available in the 20-bump DSBGA Package
KEY SPECIFICATIONS
• PSRR at 217Hz, A/DV_DD = 3V, (See Figure 1):
52dB (typ)
• P_OUT at AV_DD = 3.0V, 32Ω
– < 0.05% THD: 13mW (typ)
– < 0.05% THD: 26mW (typ)
• Supply Voltage Range
– DV_DD: 2,6V to 5.0V
– AV_DD: (See ⁽¹⁾) 2.6V to 5.5V
• Shutdown Current: 1µA (typ)
(1) Best operation is achieved by maintaining 3.0V ≤ AV_DD ≤ 5.0V
and 3.0V ≤ DV_DD ≤ 5.0V.
APPLICATIONS
• Mobile Phones
• PDAs
• Portable Electronic Devices
DESCRIPTION
The LM4921 combines a 16-bit resolution stereo I²S
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 AV_DD and DV_DD = 3.0V_DC and
driving a 32Ω single-ended load to a 26mW_RMS
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.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated