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AD7357YRUZ-RL Datasheet(PDF) 1 Page - Analog Devices

Part # AD7357YRUZ-RL
Description  Differential Input, Dual, Simultaneous Sampling, 4.2 MSPS, 14-Bit, SAR ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7357YRUZ-RL Datasheet(HTML) 1 Page - Analog Devices

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Differential Input, Dual, Simultaneous
Sampling, 4.2 MSPS, 14-Bit, SAR ADC
Preliminary Technical Data
AD7357
Rev. PrF
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
©2008 Analog Devices, Inc. All rights reserved.
FEATURES
Dual 14-bit SAR ADC
Simultaneous sampling
Throughput rate: 4.2 MSPS per channel
Specified for VDD of 2.5 V
Power dissipation: 35 mW at 4.2 MSPS
On-chip reference: 2.048 V ± 0.25%, 6 ppm/°C
Dual conversion with read
High speed serial interface
SPI-/QSPI-/MICROWIRE-/DSP-compatible
−40°C to +125°C operation
Shutdown mode: 10 µA maximum
16-lead TSSOP package
FUNCTIONAL BLOCK DIAGRAM
SCLK
AD7357
14-BIT
SUCCESSIVE
APPROXIMATION
ADC
14-BIT
SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
SDATAA
CS
SDATAB
DGND
REFGND
AGND
VDRIVE
VDD
AGND
T/H
T/H
BUF
BUF
REF
VINA+
VINA–
REFA
VINB+
VINB–
REFB
Figure 1.
GENERAL DESCRIPTION
The AD73571 is a dual, 14-bit, high speed, low power, successive
approximation analog-to-digital converter (ADC) that operates
from a single 2.5 V power supply and features throughput rates up
to 4.2 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 110 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 4.2 MSPS throughput rate, the part consumes 14 mA typically.
The part also offers flexible power/throughput rate management
options.
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).
PRODUCT HIGHLIGHTS
1.
Two Complete ADC Functions.
These 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 4.2 MSPS throughput rate with 35
mW power consumption.
3.
Simultaneous Sampling.
The part features two standard successive approximation
ADCs with accurate control of the sampling instant via a
CS input and once off conversion control.
Table 1. Related Devices
Generic
Resolution
Throughput
Analog Input
AD7356
12-bit
5 MSPS
Differential
AD7352
12-bit
3 MSPS
Differential
AD7266
12-bit
2 MSPS
Differential/Single-Ended
AD7866
12-bit
1 MSPS
Single-Ended
AD7366
12-bit
1 MSPS
Single-Ended Bipolar
AD7367
14-bit
1 MSPS
Single-Ended Bipolar
1 Protected by U.S. Patent No. 6,681,332.


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