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AD7357YRUZ Datasheet(PDF) 1 Page - Analog Devices

Part No. AD7357YRUZ
Description  Differential Input,Dual,Simultaneous Sampling, 4.25 MSPS, 14-Bit, SAR ADC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7357YRUZ Datasheet(HTML) 1 Page - Analog Devices

 
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Differential Input,Dual,Simultaneous
Sampling, 4.25 MSPS, 14-Bit, SAR ADC
Preliminary Technical Data
AD7357
Rev. PrD
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesfor itsuse,norfor anyinfringements ofpatents orother
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
©2007 Analog Devices, Inc. All rights reserved.
FEATURES
Dual 14-bit SAR ADC
Simultaneous Sampling
Throughput rate: 4.25 MSPS Per Channel
Specified for VDD of 2.5 V
Power dissipation:
35 mW at 4.25 MSPS
On-chip reference:
2.048 V ± 0.5% max @ 25°C, 10ppm/°C
Dual conversion with read
High speed serial interface:
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
−40°C to +125°C operation
Shutdown mode: 10 µA max
16-lead TSSOP package
GENERAL DESCRIPTION
The AD73571 is a dual, 14-bit, high speed, low power, successive
approximation ADC that operates from a single 2.5 V power supply
and features throughput rates up to 4.25 MSPS. The part contains
two ADCs, each preceded by a low noise, wide bandwidth track-
and-hold circuit that can handle input frequencies in excess of
200 MHz.
The conversion process and data acquisition use standard control
inputs allowing for easy interfacing to microprocessors or DSPs.
The input signal is sampled on the falling edge of CS; conversion is
also initiated at this point. The conversion time is determined by
the SCLK frequency.
The AD7357 uses advanced design techniques to achieve very low
power dissipation at high throughput rates. With 2.5 V supply and
a 4.25 MSPS throughput rate, the part consumes 14 mA typically.
The part also offers flexible power/throughput rate management
when operating in normal mode as the quiescent current
consumption is so low.
The analog input range for the part is the differential common
mode +/- Vref/2. The AD7357 has an on-chip 2.048 V reference
that can be overdriven when an external reference is preferred.
The AD7357 is available in a 16-lead thin shrink small outline
package (TSSOP).
FUNCTIONAL BLOCK DIAGRAM
AGND
CS
Vdd
SDATAA
SCLK
SDATAB
AD7357
T/H
CONTROL
LOGIC
14-BIT
SUCCESSIVE
APPROXIMATION
ADC
14-BIT
SUCCESSIVE
APPROXIMATION
ADC
T/H
DGND
REF
BUF
Vdrive
BUF
AGND
REFGND
VINA+
VINA-
VINB+
VINB-
Figure 1.
PRODUCT HIGHLIGHTS
1.
Two Complete ADC Functions Allow Simultaneous Sampling
and Conversion of Two Channels.
The conversion result of both channels is simultaneously
available on separate data lines or in succession on one data
line if only one serial port is available.
2.
High Throughput with Low Power Consumption.
The AD7357 offers a 4.25 MSPS throughput rate with 35 mW
power consumption.
3.
The part features two standard successive approximation
ADCs with accurate control of the sampling instant via a
CS input and once off conversion control.
1 Protected by U.S. Patent No. 6,681,332
Table 1: Related Devices.
Generic
Resolution
Throughput
Analog Input
AD7356
12
5MSPS
Differential
AD7352
12
3MSPS
Differential


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