3. TECHNICAL BRIEF
3.13.2 Audio signal processing & interface
3.13.2.1 TWL5034 audio interface
The device audio module contains several audio analog inputs, outputs, and digital microphone inputs. It is
connected to a multimedia processor through the TDM/codec interface (audio interface) and to a 3GPP Modem
through a pulse-code modulation (PCM) interface (voice interface) and Bluetooth interface. The audio module is
controlled by internal registers that can be accessed by the high-speed I
2C control interface.
- Feature List Overview
• Serial data ports:
– Two ports: Port 1 is a voice PCM interface; Port 2 is an audio inter-IC sound (I2S)/time-division
multiplexing (TDM) interface.
– No support for McBSP dynamic slot
– Both ports are master/slave (In TDM mode, Port2 can act only as a master.)
– Tri-state capability on I2S/TDM and PCM
• Audio and voice channels:
– Voice channel with 8- or 16-kHz sampling modes on MCLK=26MHz
– Audio channel with 8-, 11.025-, 12-, 16-, 22.05-, 24-, 32-, 44.1-, or 48-kHz sampling modes, 96 kHz
is supported on the RX path
– Audio phase-locked loop (PLL) supports 26-MHz, 19.2-MHz, or 38.4-MHz
– Carkit, analog loop mode
– Secondary microphone for noise cancellation
– Three analog microphone biases and two digital microphone biases
• Power and analog mixing
– Analog/digital mixing capability (path-mixing capability)
– 8-Ω stereo class D/class AB (16-Ω headset or 32-Ω earpiece) drivers
– Class D output power of 700 mW (8 Ω with VBAT = 4.0 V)
– Stereo with or without pseudo-ground headset driver
– Eight lines for the uplink path (four differential inputs). FM input is mono or stereo.
– Predrivers for external class D or piezoelectric speaker drivers (multiplexed on HS pseudo-ground output)
– Left/right paths switch on hands-free speaker and predriver for external class D amplifier.
– Differential H-bridge driver for Vibrator.
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