AD73411 Datasheet, PDF (1/36 Pages) Analog Devices – Low-Power Analog Front End with DSP Microcomputer

a Low-Power
Analog Front End with DSP Microcomputer
AD73411
FEATURES
AFE PERFORMANCE
16-Bit A/D Converter
16-Bit D/A Converter
Programmable Input/Output Sample Rates
76 dB ADC SNR
77 dB DAC SNR
64 kS/s Maximum Sample Rate
–90 dB Crosstalk
Low Group Delay (25 ␮s Typ per ADC Channel,
50 ␮s Typ per DAC Channel)
Programmable Input/Output Gain
On-Chip Reference
DSP PERFORMANCE
19 ns Instruction Cycle Time @ 3.3 V, 52 MIPS
Sustained Performance
AD73411-80
80K Bytes of On-Chip RAM, Configured as 16K Words
Program Memory RAM and 16K Words
Data Memory RAM
AD73411-40
40K Bytes of On-Chip RAM, Configured as 8K Words
Program Memory RAM and 8K Words
Data Memory RAM
FUNCTIONAL BLOCK DIAGRAM
DATA
ADDRESS
GENERATORS
DAG 1 DAG 2
PROGRAM
SEQUENCER
POWER-DOWN
CONTROL
MEMORY
16K PM 16K DM
(OPTIONAL (OPTIONAL
8K)
8K)
PROGRAM MEMORY ADDRESS
DATA MEMORY ADDRESS
PROGRAM MEMORY DATA
DATA MEMORY DATA
ARITHMETIC UNITS
ALU MAC SHIFTER
ADSP-2100 BASE
ARCHITECTURE
SERIAL PORTS
SPORT 0 SPORT 1
FULL MEMORY
MODE
PROGRAMMABLE
I/O
AND
FLAGS
EXTERNAL
ADDRESS
BUS
EXTERNAL
DATA
BUS
BYTE DMA
CONTROLLER
OR
TIMER
EXTERNAL
DATA
BUS
INTERNAL
DMA
PORT
HOST MODE
REF
SERIAL PORT
SPORT 2
ADC
DAC
ANALOG FRONT END
SECTION
GENERAL DESCRIPTION
The AD73411 is a single device incorporating a single analog front
end (AFE) and a microcomputer optimized for digital signal
processing (DSP) and other high-speed numeric processing
applications.
The AD73411’s analog front end (AFE) section is suitable for
general-purpose applications including speech and telephony.
The AFE section features a 16-bit A/D converter and a 16-bit
D/A converter. Each converter provides 76 dB signal-to-noise
ratio over a voiceband signal bandwidth.
The AD73411 is particularly suitable for a variety of applications
in the speech and telephony area, including low bit rate, high-
quality compression, speech enhancement, recognition, and
synthesis. The low group delay characteristic of the AFE makes
it suitable for single or multichannel active control applications.
The A/D and D/A conversion channels feature programmable
input/output gains with ranges of 38 dB and 21 dB respectively.
An on-chip reference voltage is included to allow single supply
operation.
The sampling rate of the AFE is programmable with four sepa-
rate settings offering 64, 32, 16, and 8 kHz sampling rates (from
a master clock of 16.384 MHz) while the serial port (SPORT2)
allows easy expansion of the number of I/O channels by cascad-
ing extra AFEs external to the AD73411.
The AD73411’s DSP engine combines the ADSP-2100 family
base architecture (three computational units, data address gen-
erators, and a program sequencer) with two serial ports, a 16-bit
internal DMA port, a byte DMA port, a programmable timer,
Flag I/O, extensive interrupt capabilities, and on-chip program
and data memory.
The AD73411-80 integrates 80K bytes of on-chip memory
configured as 16K words (24-bit) of program RAM, and 16K
words (16-bit) of data RAM. The AD73411-40 integrates
40K bytes of on-chip memory configured as 8K words (24-
bit) of program RAM, and 8K words (16-bit) of data RAM.
Power-down circuitry is also provided to meet the low power
needs of battery-operated portable equipment. The AD73411
is available in a 119-ball PBGA package.
REV. 0
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© Analog Devices, Inc., 2000