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LM48822 Datasheet(PDF) 11 Page - Texas Instruments |
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LM48822 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page START MSB DEVICE ADDRESS LSB ACK SCL SDA STOP MSB REGISTER DATA LSB ACK R/W LM48822, LM48822TLEVAL www.ti.com SNAS456B – MAY 2008 – REVISED MARCH 2011 Figure 6. Example I2C Write Cycle Table 2. Device Address B7 B6 B5 B4 B3 B2 B1 B0 (R/W) Device 1 1 0 0 0 0 0 0 Address Table 3. I2C Control Registers Register Register B7 B6 B5 B4 B3 B2 B1 B0 Address Name MODE MUTE_ MUTE_ 0 0 SDL SD_BIAS CP_ONLY 0 SDR CONTROL LEFT RIGHT VOLUME 1 1 SHDN VOL5 VOL4 VOL3 VOL2 VOL1 VOL0 CONTROL Table 4. Mode Control Register Bit Name Value Description 0 Left channel enabled B6 SDL 1 Left channel disabled 0 Bias enabled B5 SD_BIAS 1 Bias disabled 0 Normal operation B4 CP_ONLY 1 Charge-pump only mode. Amplifiers and Bias disabled. B3 UNUSED 0 Set B3 to 0 0 Left channel Normal Operation B2 MUTE_LEFT 1 Left channel Mute 0 Right channel enabled B1 SDR Right channel disabled. Right channel audio inputs summed with 1 left channel audio inputs and routed to OUTL 0 Right channel Normal Operation B0 MUTE_RIGHT 1 Right channel Mute GENERAL AMPLIFIER FUNCTION The LM48822 headphone amplifier feature National’s ground referenced architecture that eliminates the large DC-blocking capacitors required at the outputs of traditional headphone amplifiers. A low-noise inverting charge pump creates a negative supply (CPVSS) from the positive supply voltage (VDD). The headphone amplifiers operate from these bipolar supplies, with the amplifier outputs biased about GND, instead of a nominal DC voltage (typically VDD/2), like traditional amplifiers. Because there is no DC component to the headphone output signals, the large DC-blocking capacitors (typically 220 μF) are not necessary, conserving board space and system cost, while improving frequency response. Copyright © 2008–2011, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM48822 LM48822TLEVAL |
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