806437508EVAL_AD7440_7450A| Application Note
Evaluation Board for Differential Input, 10-/12-Bit ADCs with a Serial Interface EVAL-AD7440/AD7450A
FEATURES
Full-featured evaluation board for the AD7440/AD7450A EVAL-CONTROL BRD2 compatible Standalone capability On-board analog buffering and reference On-board single-ended-to-differential conversion Various linking options PC software for control and data analysis when used with evaluation board controller
the AD7440/AD7450A data sheet that is available from Analog Devices, Inc., and should be consulted in conjunction with this data sheet when using the evaluation board. On-board components include an AD780, which is a pinprogrammable +2.5 V or +3 V ultrahigh precision band gap reference, one AD713 quad op amp, two AD8022 dual op amps, one AD8138 differential amplifier, and a 7S04 inverter. Various link options are explained in detail in Table 1. Interfacing to this board is through a 96-way connector. This 96-way connector is compatible with the EVAL-CONTROL BRD2, which is also available from Analog Devices. External sockets are provided for a number of signals including the VREF input; the VIN+ and VIN- inputs; the optional, external SCLK and CS inputs; and SDATA out.
GENERAL DESCRIPTION
This data sheet describes the evaluation board for the AD7440/ AD7450A, which are 10-/12-bit, high speed, low power successive approximation ADCs with a fully differential analog input. These parts operate from a single +5 V or +3 V power supply. Full details on the EVAL-AD7440/AD7450A are available in
FUNCTIONAL BLOCK DIAGRAM
BIPOLAR/UNIPOLAR SINGLE-ENDED INPUT
BIPOLAR SINGLE-ENDED INPUT
SINGLE-ENDEDTO-DIFFERENTIAL CONVERSION USING AD8138 OPTIONAL BIAS-UP CIRCUITRY FOR SINGLE-ENDED OPERATION
SINGLE-ENDED OR DIFFERENTIAL INPUT
VIN+ VIN
AD7440/ AD7450A
CS
SDATA
SCLK BIPOLAR INPUT VREF UNIPOLAR OUTPUT EXTERNAL VREF
Figure 1.
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards as supplied "as is" and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. 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 that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems.
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.
06231-001
POWER SUPPLY CIRCUITS
96-WAY EDGE CONNECTOR
SINGLE-ENDEDTO-DIFFERENTIAL CONVERSION USING DUAL OP AMP
VDD
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