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AD7938BCP Datasheet(PDF) 1 Page - Analog Devices |
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AD7938BCP Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer Preliminary Technical Data AD7938/AD7939 FEATURES Fast throughput rate: 1.5 MSPS Specified for VDD of 2.7 V to 5.25 V Low power 8 mW max at 1.5 MSPS with 3 V supplies 16 mW max at 1.5 MSPS with 5 V supplies 8 analog input channels with a sequencer Software configurable analog inputs 8-channel single-ended inputs 4-channel fully differential inputs 4-channel pseudo-differential inputs 7-channel pseudo-differential inputs Accurate on-chip 2.5 V reference Wide input bandwidth 70 dB SNR at 50 kHz input frequency No pipeline delays High speed parallel interface—word/byte modes Full shutdown mode: 1 µA max 32-lead LFCSP and TQFP package FUNCTIONAL BLOCK DIAGRAM VIN7 T/H PARALLEL INTERFACE/CONTROL REGISTER SEQUENCER 12-/10-BIT SAR ADC AND CONTROL I/P MUX 2.5V VREF DB0 DB11 VDRIVE VDD AD7938/AD7939 VIN0 AGND VREFIN/ VREFOUT CLKIN BUSY CONVST CS DGND RD WR W/B Figure 1. GENERAL DESCRIPTION The AD7938/AD7939 are 12-bit and 10-bit, high speed, low power, successive approximation (SAR) ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1.5 MSPS. The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier that can handle input frequencies up to 20 MHz. The AD7938/AD7939 feature eight analog input channels with a channel sequencer that allow a preprogrammed selection of channels to be converted sequentially. These parts can operate with either single-ended, fully differential, or pseudo- differential analog inputs. The conversion process and data acquisition are controlled using standard control inputs that allow easy interfacing with microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST and the conversion is also initiated at this point. The AD7938/AD7939 have an accurate on-chip 2.5 V reference that can be used as the reference source for the analog-to-digital conversion. Alternatively, this pin can be overdriven to provide an external reference. These parts use advanced design techniques to achieve very low power dissipation at high throughput rates. They also feature flexible power management options. An on-chip control register allows the user to set up different operating conditions, including analog input range and configuration, output coding, power management, and channel sequencing. PRODUCT HIGHLIGHTS 1. High throughput with low power consumption. 2. Eight analog inputs with a channel sequencer. 3. Accurate on-chip 2.5 V reference. 4. Software configurable analog inputs. Single-ended, pseudo- differential, or fully differential analog inputs that are software selectable. 5. Single-supply operation with VDRIVE function. The VDRIVE function allows the parallel interface to connect directly to 3 V, or 5 V processor systems independent of VDD. 6. No pipeline delay. 7. Accurate control of the sampling instant via a CONVST input and once off conversion control. PrN 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. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. 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 © 2004 Analog Devices, Inc. All rights reserved. Rev. |
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