LG LG-E730 - Page 66

3. TECHNICAL BRIEF
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Only for training and service purposes
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3.12.2 Audio signal processing & interface
3.12.2.1 QTR8200 Auido intern
The QTR8200 audio codec includes multiple Tx and Rx paths to support a variety of I/Os. This wideband codec is
supplemented by baseband circuits and software to support many speech formats; multimedia applications like
MP3, various versions of AAC, Windows Media Audio, and AMR; PureVoice; acoustic echo cancellation; standard
MIDI with 16 voices; and 128-tone CMX(text, picture, and MIDI streaming).
T Key audio codec features include:
¾ ଝ Tx path
z ଝ Stereo ADC – 92 dB dynamic range (typical; 48 kHz, 24 bit, 256 x FS oversampling)
z ଝ Programmable sampling rates (FS) – 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, and 48 kHz
z ଝ Independent Tx clock with programmable oversampling rate (OSR) – 64, 128, and 256
z Five analog input ports ଝ – MIC1 (differential); MIC2 (differential); stereo line inputs (both differential);
and AUX (differential) Stereo digital MIC input (shares pins with AUX analog input)
z ଝ Programmable Tx analog gain settlings – 0, 4.5, and 24 dB
z ଝ Programmable gain amplifier (PGA) paths – -27.5 to +11.5 dB gain, in 3 dB steps
z ଝ Selectable PCM audio bit width – 16 or 24 bit
z ଝ Integrated digital decimation filter
z ଝ Programmable digital gain – -66 to +30 dB
¾ ଝ Rx path
z ଝ Stereo DAC – 100 dB dynamic range (typical; single-ended HPH path in capless mode)
z ଝ Programmable sampling rates (FS) – 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, and 48 kHz
z ଝ Independent Rx clock with programmable over sampling rate (OSR) – 64, 128, and 256
z ଝ Four analog output ports – 32 ohm earphone (differential); stereo headphone outputs (both single-
ended 16 ohm or differential 32 ohm); line outputs (two single-ended 600 ohm outputs for stereo
mode or one differential 600 ohm for mono mode); and AUX (single-ended 600 ohm )
z ଝ Headphone driver options:
– Class-AB capless (using the PMIC’s negative charge pump -1.8 V supply)
– Class-AB capacitor-coupled legacy mode
– Class-D capacitor-coupled output (with external LC filter)
z ଝ The stereo class-D HPH option includes programmable switching frequency and over-current
protection
z ଝ Selectable PCM audio bit width – 16 or 24 bit