D Advanced, Catalog Speech Processor for
High-Quality Sound, Capable of Unlimited
Speech Duration Using External Memory
D Operates up to 12.32 MIPS
D Supports High-Quality Algorithms Such as
MELP (1.0 Kbps – 3.5 Kbps at 8 kHz), CELP
(3.0 Kbps – 11.2 kHz at 8 kHz Sampling
Rate), ADPCM, Single Channel FM With
CELP or MELP
D Speed and Pitch Shifting in MELP for
Various Voice Effects
D Six Level Digital Gain Control
D 4 User Configurable I/O’s
SPSS030A – DECEMBER 2000 – REVISED FEBRUARY 2001
D Very Low-Power Operation, Ideal for
D Low-Voltage Operation, Sustainable by
Three (3) Batteries
D Three Reduced Power Standby Modes,
Less Than 10 µA in Deep-Sleep Mode
D Resistor-Trimmed Oscillator or 32.768-kHz
Crystal Reference Oscillator
D Direct Speaker Drive (32 Ω) (PDM)
D Interrupt Driven, 4- or 8-Bit Parallel Data
D Available in Die Form or 64-Pin PM Package
The MSP53C691 is a standard slave synthesizer from Texas Instruments that accepts compressed speech data
from other microprocessors/microcontrollers and converts it to speech. This allows the TI MSP53C691 to be
used with a master microprocessor/microcontroller in various speech-related products such as security
systems, learning aids, games, and toys. High quality, low bit-rate coders, easy interface with the master
microcontroller, digital gain control, low power sleep mode, and low voltage operation makes this device ideal
for products requiring long duration speech, less development cycle times, and peripheral device control
through the slave device.
This device supports several speech synthesis algorithms that permit tradeoffs to meet the price performance
requirements of various markets. The MSP53C691 implements a unique feature of playing a single channel FM
music along with CELP or MELP speech data concurrently. This feature allows the user to speak a certain
phrase in MELP or CELP with single channel music in the background.
The MSP53C691 is optimized to support a 4-bit wide data transfer protocol. The device has two status bits and
three control bits that control the communication protocol between the master and the slave. The MSP53C691
also has 1 bit (command/data) which differentiates between a command or speech data feeding into the slave.
In 4-bit mode, various commands are sent to the slave during speech to perform various tasks.
The MSP53C691 also supports the 8-bit wide data transfer but the support for commands is disabled during
speaking-a-phrase. When speaking-a-phrase in 8-bit mode is complete, the MSP53C691 switches back to the
4-bit mode to receive the next command. Switching between 4-bit mode or 8 bit mode is permitted between
speech data files.
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.
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.
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