The AD7450A/AD7440 are respectively 12- and 10-bit, high speed, low power, successive-approximation (SAR) analog-to-digital converters that feature a fully differential analog input. These parts operate from a single 3 V or 5 V power supply and feature throughput rates up to 1 MSPS.
The parts contains a low-noise, wide bandwidth, differential track and hold amplifier (T/H), which can handle input frequencies in excess of 1 MHz with the –3 dB point being 20 MHz 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.
MICROWIRE is a trademark of National Semiconductor Corporation.
SPI and QSPI are trademarks of Motorola, Inc.
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|AD7440/AD7450A: Differential Input, 1MSPS, 10-Bit and 12-Bit ADCs in 8-lead SOT-23 Data Sheet (Rev C, 09/2005) (pdf, 777 kB)||Data Sheets|
|MS-2210: Designing Power Supplies for High Speed ADC (pdf, 327 kB)||Technical Articles|
Maximize Performance When Driving Differential ADCs
... Converting a single-ended signal to a differential signal before the analog-to-digital conversion can improve the performance of your data-acquisition system. By Sally Paterson, Analog Devices (EDN, 6/12/2003)
8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog
(pdf, 1885 kB)
8- to 18-Bit SAR ADCs with Sample Rates up to 3 MSPS -- The latest additions to ADI’s ADC portfolio offer unrivaled functionality in terms of channel count and power supply voltage, optimal power/speed ratios, and the smallest packages to meet the demands of any data acquisition application, including portable, industrial, medical, wireless, and communications.
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