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AD7934BRUZ Fiches technique(PDF) 1 Page - Analog Devices |
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AD7934BRUZ Fiches technique(HTML) 1 Page - Analog Devices |
1 / 32 page 4-Channel, 1.5 MSPS, 10-Bit and 12-Bit Parallel ADCs with a Sequencer AD7933/AD7934 Rev. B 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 ©2005–2007 Analog Devices, Inc. All rights reserved. FEATURES Throughput rate: 1.5 MSPS Specified for VDD of 2.7 V to 5.25 V Low power 6 mW maximum at 1.5 MSPS with 3 V supplies 13.5 mW maximum at 1.5 MSPS with 5 V supplies 4 analog input channels with a sequencer Software configurable analog inputs 4-channel single-ended inputs 2-channel fully differential inputs 2-channel pseudo differential inputs Accurate on-chip 2.5 V reference ±0.2% maximum @ 25°C, 25 ppm/°C maximum (AD7934) 70 dB SINAD at 50 kHz input frequency No pipeline delays High speed parallel interface—word/byte modes Full shutdown mode: 2 μA maximum 28-lead TSSOP package FUNCTIONAL BLOCK DIAGRAM VIN3 T/H PARALLEL INTERFACE/CONTROL REGISTER SEQUENCER 12-/10-BIT SAR ADC AND CONTROL I/P MUX 2.5V VREF DB0 DB11 VDRIVE VDD AD7933/AD7934 VIN0 AGND VREFIN/ VREFOUT CLKIN BUSY CONVST CS DGND RD WR W/B Figure 1. GENERAL DESCRIPTION The AD7933/AD7934 are 10-bit and 12-bit, high speed, low power, successive approximation (SAR) analog-to-digital converters (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 handles input frequencies up to 50 MHz. The AD7933/AD7934 feature four analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be sequentially converted. These parts can accept either single-ended, fully differential, or pseudo differential analog inputs. The conversion process and data acquisition are controlled using standard control inputs that allow for easy interfacing to microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST, and the conversion is also initiated at this point. The AD7933/AD7934 has an accurate on-chip 2.5 V reference that is 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. Four analog inputs with a channel sequencer. 3. Accurate on-chip 2.5 V reference. 4. 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. Table 1. Related Devices Device No. of Bits No. of Channels Speed AD7938/AD7939 12/10 8 1.5 MSPS AD7938-6 12 8 625 kSPS AD7934-6 12 4 625 kSPS |
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