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PDF AD7456 Data sheet ( Hoja de datos )
| Número de pieza | AD7456 | |
| Descripción | Differential Input / 12-Bit ADC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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PRELIMINARY TECHNICAL DATA
a
Differential Input, 100kSPS,
12-Bit ADC in 8-lead SOT-23
Preliminary Technical Data
AD7456
FEATURES
Specified for VDD of 3 V and 5 V
Very Low Power:
TBD mW typ at 100kSPS with 3 V Supplies
TBD mW typ at 100kSPS with 5 V Supplies
Fully Differential Analog Input
Wide Input Bandwidth:
70dB SINAD at 20kHz Input Frequency
No Pipeline Delays
Serial Interface - SPITM/QSPITM/MICROWIRETM/
DSP Compatible
Automatic Power-Down Mode
8 Pin SOT-23 and µSOIC Package
APPLICATIONS
Transducer Interface
Battery Powered Systems
Data Acquisition Systems
Portable Instrumentation
Motor Control
Communications
FUNCTIONAL BLOCK DIAGRAM
VDD
VIN+
VIN-
VREF
T/H
12-BIT SUCCESSIVE
APPROXIMATION
ADC
AD7456
CONTROL
LOGIC
DataSheet4U.com
GND
SCLK
SDATA
CS
DataShee
GENERAL DESCRIPTION
The AD7456 is a 12-bit, low power, successive-approxi-
mation (SAR) analog-to-digital converter that features a
fully differential analog input. This part operates from a
single 3 V or 5 V power supply and features throughput
rates up to 100kSPS.
powered up on the falling edge of CS and a conversion is
initiated on the rising edge of CS, where the analog input
is sampled. Once a conversion is complete, the device
automatically enters a power down mode to reduce power
dissipation between conversions.
The part contains a low-noise, wide bandwidth, differen-
tial track and hold amplifier (T/H) which can handle
input frequencies in excess of 1MHz with the -3dB point
being 20MHz typically. The reference voltage is applied
externally to the VREF pin and can be varied from 100 mV
to 3.5 V depending on the power supply and what suits the
application. The value of the reference voltage determines
the common mode voltage range of the part. With this
truly differential input structure and variable reference
input, the user can select a variety of input ranges and bias
points.
The conversion process and data acquisition are controlled
using CS and the serial clock allowing the device to inter-
face with Microprocessors or DSPs. The device is
MICROWIRE is a trademark of National Semiconductor Corporation.
SPI and QSPI are trademarks of Motorola, Inc.
The SAR architecture of this part ensures that there are
no pipeline delays.
PRODUCT HIGHLIGHTS
1.Operation with either 3 V or 5 V power supplies.
2.Low Power Consumption.
With a 3V supply, the AD7456 offer TBDmW
typ power consumption for 100kSPS throughput.
3.Fully Differential Analog Input.
4.Variable Voltage Reference Input.
5.No Pipeline Delay.
6.Accurate control of the sampling instant via a CS input
and once off conversion control.
7.8-lead SOT-23 package.
8. ENOB > 8 bits typically with 100mV reference.
REV. PrA 24/05/02
Information furnished by Analog Devices is believed to be accurate and
DataSheet4Urel.icaoblme. 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.
DataSheet4 U .com
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., 2002
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PRELIMINARY TECHNICAL DATA
AD7456
ABSOLUTE MAXIMUM RATINGS1
(TA = +25°C unless otherwise noted)
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +7 V
VIN+ to GND . . . . . . . . . . . . . . . . . –0.3 V to VDD + 0.3 V
VIN- to GND . . . . . . . . . . . . . . . –0.3 V to VDD + 0.3 V
Digital Input Voltage to GND . . . . . . . . -0.3 V to +7 V
Digital Output Voltage to GND . -0.3 V to VDD + 0.3 V
VREF to GND . . . . . . . . . . . . . . . . . -0.3 V to VDD +0.3 V
Input Current to Any Pin Except Supplies2 . . . . ±10mA
Operating Temperature Range
Commercial (A, B Version) . . . . . . . . . -40oC to +85oC
Storage Temperature Range . . . . . . . . . -65oC to +150oC
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . +150oC
JA Thermal Impedance . . . . . . . . . . 205.9°C/W (µSOIC)
211.5°C/W (SOT-23)
JC Thermal Impedance . . . . . . . . 43.74°C/W (µSOIC)
91.99°C/W (SOT-23)
Lead Temperature, Soldering
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . +215oC
Infared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . +220oC
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.5kV
2 00µA
IOL
TO
OUTP UT
PIN
CL
50 pF
2 00µA
IOH
+1.6V
Figure 3. Load Circuit for Digital Output Timing
Specifications
et4U.com
NOTES
1Stresses above those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. This is a stress rating only and functional operation of the device
at these or any other conditions above those listed in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
2Transient currents of up to 100 mA will not cause SCR latch up.
DataSheet4U.com
ORDERING GUIDE
DataShee
Model
AD7456BRT
AD7456BRM
TBD
EVAL-CONTROL BRD23
Range
-40°C to +85°C
-40°C to +85°C
Evaluation Board
Controller Board
Linearity
Error (LSB)1
±1 LSB
±1 LSB
Package
Option4
RT-8
RM-8
Branding Information
TBD
TBD
NOTES
1Linearity error here refers to Integral Non-linearity Error.
2This can be used as a stand-alone evaluation board or in conjunction with the EVALUATION BOARD CONTROLLER for evaluation/demonstration purposes.
3EVALUATION BOARD CONTROLLER. This board is a complete unit allowing a PC to control and communicate with all Analog Devices
evaluation boards ending in the CB designators. To order a complete Evaluation Kit, you will need to order the ADC evaluation board i.e.
TBD, the EVAL-CONTROL BRD2 and a 12V AC transformer. See the TBD technote for more information.
4S0 = SOIC; RM = µSOIC
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V
readily accumulate on the human body and test equipment and can discharge without
detection. Although the AD7456 features proprietary ESD protection circuitry,
permanent damage may occur on devices subjected to high-energy electrostatic
DataSheet4Udi.sccohmarges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. PrA
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| PDF Descargar | [ Datasheet AD7456.PDF ] | |
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