AD1334_15 Datasheet, PDF (1/16 Pages) Analog Devices – FOUR CHANNEL 12 BIT SAMPLING A/D CONVERTER FOR DIGITAL SIGNAL PROCESSING

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r. ANALOG
L8II DEVICES
Four-Channel
12-BitSamplingAIDConverter
forDigitaSl ignaPl roce~ing
AD1334 I
FEATURES
Four-Channel AID Converter for DSP Includes:
Simultaneous or Independent Sampling
BLOCK DIAGRAM
RE'OUT
Capability
12-8it Accurate AID Converter
CHANC IN
2-8it ChannellD Tags Each Conversion Result
32-Word FIFO Memory
Fully Asynchronous, High Speed Digital Interface
CHANI IN
-oC 013
Single-Channel Sample Rate Up to 67 kHz
OBSOLETE Four-Channel Simultaneous Sample Rate Up to 28 kHz
Entire System Dynamically Characterized
Minimal Effective Aperture Delay Mismatch from
Channel-to-Channel BeDevice-to-Device
15 ns Data Access Time Allows "'No Wait Staten
Interface to: ADSp.2100 (A), TMS32OC25
DSP56000. NECp.PD77230
Low Power, 250 mW/Channel
APPUCATlONS
Sonar Signal Processing
Robotics/Machine Control
Disk-Drive Head Positioning
VIbration Analysis
PRODUCT DESCRIPTION
The AD1334 is a four-channel, 12-bit, sampling ND convener
system optimized for use in multichannel digital signal process-
ing (DSP) applications. The device consists of four independent
CHAr;> IN
CHAN3 IN
AD1334
..
OS
ifST
ill
Wi<
IRQ
SIMUL. 3 2 1 . ClK READYCONTROL
SAMf'LE IN
EN8
For effective use in simultaneous sampling applications, the
sample-and-hold amplifiers are designed to provide a minimum
amount of apenure delay time mismatch from channel-to-
channel and device-to-device.
The 12-bit AID converter can convert :t 5 V full scale signals at
sample rates up to 67 kHz for single-channel operation. In the
simultaneous mode, the AD1334 has a four-channel sample rate
up to 28 kHz. The entire converter system is specified and
sample-and-hold amplifiers, a multiplexer, an ND converter, a
tested for signal-to-noise ratio, rotal harmonic distortion and
controller, a 32-word FIFO memory and a fully asynchronous
channel-to-channel isolation.
high speed digital interface. The product is packaged in a 4O-pin
hermetic DIP.
The digital interface provides a true asynchronous link between
The channel controller enables the AD 1334 to appear as four
independent channels of analog input by generating all of the
timing necessary to ensure that the sampled channel is digitized
to 12-bit accuracy. Upon receipt of a sample command, the con-
troller will immediately place the sample-and-hold amplifier into
the ND and a high speed microprocessor. Data transfer is con-
trolled by generating an interrupt signal when data is available.
Interrupts can be generated when the FIFO is full (32 words),
half-full (16 words), or when a single word of data is ready
(FIFO bypassed). The AD1334 can also generate an interrupt
when the ND conversion results are overrange.
hold mode and then prioritize and schedule the held value for
ND conversion. At the appropriate time, the sampled input is
gated through the multiplexer and, after settling, is digitized by
the ND convener. The sample-and-hold amplifier is then re-
The AD1334 provides a completely specified and tested system
that bridges the interface and specification gap between ND
converters and high speed DSP.
turned to sample mode so that it can acquire the next sample.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone]
Twx: 710/394-6577
Telex: 924491
Cable: ANALOG NORWOODMASS
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