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AD73460 Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte AD73460
Spiegazioni elettronici  Six-Input Channel Analog Front End
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD73460
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
Six-Input Channel
Analog Front End
FEATURES
AFE PERFORMANCE
Six 16-Bit A/D Converters
Programmable Input Sample Rate
Simultaneous Sampling
72 dB SNR
64 kS/s Maximum Sample Rate
–80 dB Crosstalk
Low Group Delay (25
s Typ per ADC Channel)
Programmable Input Gain
Single Supply Operation
On-Chip Reference
DSP PERFORMANCE
19 ns Instruction Cycle Time @ 3.3 V, 52 MIPS
Sustained Performance
Single-Cycle Instruction Execution
Single-Cycle Context Switch
3-Bus Architecture Allows Dual Operand Fetches in
Every Instruction Cycle
Multifunction Instructions
Power-Down Mode Featuring Low CMOS Standby
Power Dissipation with 400 Cycle Recovery from
Power-Down Condition
Low Power Dissipation in Idle Mode
FUNCTIONAL BLOCK DIAGRAM
SERIAL PORT
SPORT 2
REF
ADC3
ANALOG FRONT END
SECTION
ADC1
ADC2
ADC4
ADC5
ADC6
EXTERNAL
ADDRESS
BUS
SERIAL PORTS
SPORT 0
SHIFTER
MAC
ALU
ARITHMETIC UNITS
MEMORY
PROGRAMMABLE
I/O
AND
FLAGS
BYTE DMA
CONTROLLER
TIMER
ADSP-2100 BASE
ARCHITECTURE
POWER-DOWN
CONTROL
PROGRAM
SEQUENCER
DAG 2
DATA
ADDRESS
GENERATORS
PROGRAM MEMORY ADDRESS
DATA MEMORY ADDRESS
PROGRAM MEMORY DATA
DATA MEMORY DATA
DAG 1
16K DM
(OPTIONAL
8K)
16K PM
(OPTIONAL
8K)
EXTERNAL
DATA
BUS
FULL MEMORY
MODE
SPORT 1
AD73460
GENERAL DESCRIPTION
The AD73460 is a six-input channel analog front-end processor
for general-purpose applications including industrial power meter-
ing or multichannel analog inputs. It features six 16-bit A/D
conversion channels, each of which provides 72 dB signal-to-noise
ratio over a dc-to-2 kHz signal bandwidth. Each channel also
features a programmable input gain amplifier (PGA) with gain
settings in eight stages from 0 dB to 38 dB.
The AD73460 is particularly suitable for industrial power metering
as each channel samples synchronously, ensuring that there is
no (phase) delay between the conversions. The AD73460 also
features low group delay conversions on all channels.
An on-chip reference voltage of 1.25 V is included. The sampling
rate of the device is programmable with separate settings
offering 64 kHz, 32 kHz, 16 kHz, 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 input channels by cas-
cading an extra AFE external to the AD73460.
The AD73460’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 AD73460-80 integrates 80K bytes of on-chip memory
configured as 16K words (24-bit) of program RAM and 16K
(16-bit) of data RAM. The AD73460-40 integrates 40K bytes
of on-chip memory configured as 8K words (24-bit) of program
RAM and 8K (16-bit) of data RAM. Power-down circuitry is
also provided to meet the low power needs of battery-operated
portable equipment. The AD73460 is available in a 119-ball
PBGA package.


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