TWL1110 Datasheet, PDF (1/37 Pages) Texas Instruments – VOICE-BAND AUDIO PROCESSOR VBAPE

TWL1110
VOICE-BAND AUDIO PROCESSOR (VBAP™)
D 2.7 to 3.3-V Operation
D Designed for Analog and Digital Wireless
Handsets and Telecommunications
Applications
D Two Differential Microphone Inputs
D Differential Earphone Outputs and One
Single-Ended Earphone Output
D Earphone and Microphone Mute
D Programmable Transmit, Receive, and
Sidetone Paths With Extended Gain and
Attenuation Ranges
D Programmable for 15-Bit Linear Data or
8-Bit Companded (µ-law and A-law) Mode
D Supports PCM Clock Rates of 128 kHz and
2.048 MHz
D Pulse Density Modulated (PDM) Buzzer
Output
SLWS103 – NOVEMBER 2000
D On-Chip I²C Bus, Which Provides Simple,
Standard, Two-Wire Serial Interface With
Digital ICs
D Dual-Tone Multifrequency (DTMF) and
Single-Tone Generator Capable of Up to
8-kHz Tone With Three Selectable
Resolutions of 7.8125 Hz, 15.625 Hz, and
31.25 Hz
D 2-Channel Auxiliary Multiplexer (MUX)
(Analog Switch)^{
D Capable of Driving 32 Ω Down to a 8-Ω
Speaker
D Programmable Power Down Modes
D Pin Compatible to TI’s TWL1102, TWL1103,
and TWL1109 Devices for TQFP only
D Available in a 32-Pin Thin Quad Flatpack
(TQFP) Package and MicroStar Junior t
BGA
description
The TWL1110 provides extended gain and attenuation flexibility for transmit, receive, and sidetone paths. A
differential earphone output is capable of driving speaker loads as low as 8 Ω for use in speaker phone
applications. The single tone function on the TWL1110 generates a single tone output of up to 8 kHz. The
resolution of the DTMF tone is also selectable to 7.8125 Hz, 15.625 Hz, or 31.250 Hz through the interface
control. The analog switch provides more control capabilities for voice-band audio processor (VBAP).
The VBAP is an analog-digital interface for voice band signals designed with a combination of coders and
decoders (codecs) and filters. It is a low-power device with companding options and programming features, and
it meets the requirements for communication systems, including the cellular phone. The device operates in
either the 15-bit linear or 8-bit companded (µ-law or A-Law) mode, which is selectable through the I²C interface.
A coder, an analog-to-digital converter or ADC, digitizes the analog voice signal, and a decoder, an
digital-to-analog converter or DAC, analogs the digital-voice signal. VBAP provides a companding option to
overcome the bandwidth limitations of telephone networks without degradation in sound quality. The human
auditory system is a logarithmic system in which high amplitude signals require less resolution than low
amplitude signals. Therefore, an 8-bit code word with nonuniform quantization (µ-law or A-law) has the same
quality as 13-bit linear coding. VBAP provides better digital code words by generating a 15-bit linear coding
option.
This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These
circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C,
Method 3015; however, it is advised that precautions be taken to avoid application of any voltage higher than maximum-rated
voltages to these high-impedance circuits. During storage or handling, the device leads should be shorted together or the device
should be placed in conductive foam. In a circuit, unused inputs should always be connected to an appropriated logic voltage level,
preferably either VCC or ground. Specific guidelines for handling devices of this type are contained in the publication Guidelines for
Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
† _{These options are available on some devices. Please see the table of comparison for the last two generations of VBAPs.}
MicroStar Junior and VBAP are trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 2000, Texas Instruments Incorporated
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