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AD7934-6 Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte AD7934-6
Spiegazioni elettronici  4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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4-Channel, 625 kSPS, 12-Bit
Parallel ADC with a Sequencer
AD7934-6
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2005–2007 Analog Devices, Inc. All rights reserved.
FEATURES
Throughput rate: 625 kSPS
Specified for VDD of 2.7 V to 5.25 V
Power consumption
3.6 mW maximum at 625 kSPS with 3 V supplies
7.5 mW maximum at 625 kSPS with 5 V supplies
4 analog input channels with a sequencer
Software-configurable analog inputs
4-channel single-ended inputs
2-channel fully differential inputs
2-channel pseudo differential inputs
Accurate on-chip 2.5 V reference
±0.2% maximum @ 25°C, 25 ppm/°C maximum
70 dB SINAD at 50 kHz input frequency
No pipeline delays
High speed parallel interface—word/byte modes
Full shutdown mode: 2 μA maximum
28-lead TSSOP package
FUNCTIONAL BLOCK DIAGRAM
VIN3
T/H
PARALLEL INTERFACE/CONTROL REGISTER
SEQUENCER
12-BIT
SAR ADC
AND
CONTROL
I/P
MUX
2.5V
VREF
DB0 DB11
VDRIVE
VDD
AD7934-6
VIN0
AGND
VREFIN/
VREFOUT
CLKIN
BUSY
CONVST
CS
DGND
RD WR W/B
Figure. 1
GENERAL DESCRIPTION
The AD7934-6 is a 12-bit, high speed, low power, successive
approximation (SAR) analog-to-digital converter (ADC). The
part operates from a single 2.7 V to 5.25 V power supply and
features throughput rates up to 625 kSPS. The part contains a
low noise, wide bandwidth, differential track-and-hold
amplifier that handles input frequencies up to 50 MHz.
The AD7934-6 features four analog input channels with a channel
sequencer that allows a preprogrammed selection of channels to
be converted sequentially. This part can accept either single-
ended, fully differential, or pseudo differential analog inputs.
Data acquisition and conversion are controlled by standard control
inputs that allow for easy interfacing to microprocessors and
DSPs. The input signal is sampled on the falling edge of CONVST,
which is also the point where the conversion is initiated.
The AD7934-6 has an accurate on-chip 2.5 V reference that
can be used as the reference source for the analog-to-digital
conversion. Alternatively, this pin can be overdriven to provide
an external reference.
The AD7934-6 uses advanced design techniques to achieve very
low power dissipation at high throughput rates. The part also
features flexible power management options. An on-chip control
register allows the user to set up different operating conditions,
including analog input range and configuration, output coding,
power management, and channel sequencing.
PRODUCT HIGHLIGHTS
1.
High throughput with low power consumption.
2.
Four analog inputs with a channel sequencer.
3.
Accurate on-chip 2.5 V reference.
4.
Single-ended, pseudo differential, or fully differential
analog inputs that are software selectable.
5.
No pipeline delay.
6.
Accurate control of the sampling instant via a CONVST
input and once-off conversion control.
Table 1. Related Devices
Similar Device
No. of Bits
No. of Channels
Speed
AD7938/AD7939
12/10
8
1.5 MSPS
AD7933/AD7934
10/12
4
1.5 MSPS
AD7938-6
12
8
625 kSPS


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