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AD7934-6 데이터시트(PDF) 1 Page - Analog Devices |
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AD7934-6 데이터시트(HTML) 1 Page - Analog Devices |
1 / 28 page 4-Channel, 625 kSPS, 12-Bit Parallel ADC with a Sequencer AD7934-6 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements 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.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 Analog Devices, Inc. All rights reserved. FEATURES Throughput rate: 625 kSPS Specified for VDD of 2.7 V to 5.25 V Power consumption 3.6 mW max at 625 kSPS with 3 V supplies 7.5 mW max at 625 kSPS 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% max @ 25°C, 25 ppm/°C max 70 dB SINAD at 50 kHz input frequency No pipeline delays High speed parallel interface—word/byte modes Full shutdown mode: 2 µA max 28-lead TSSOP package FUNCTIONAL BLOCK DIAGRAM VIN3 T/H PARALLEL INTERFACE/CONTROL REGISTER SEQUENCER 12-BIT SAR ADC AND CONTROL I/P MUX 2.5V VREF DB0 DB11 VDRIVE VDD AD7934-6 VIN0 AGND VREFIN/ VREFOUT CLKIN BUSY CONVST CS DGND RD WR W/B Figure. 1 GENERAL DESCRIPTION The AD7934-6 is a 12-bit, high speed, low power, successive approximation (SAR) analog-to-digital converter (ADC). The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 625 kSPS. The part contains a low noise, wide bandwidth, differential track-and-hold amplifier that handles input frequencies up to 50 MHz. The AD7934-6 features four analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially. This part can accept either single- ended, fully differential, or pseudo differential analog inputs. Data acquisition and conversion are controlled by standard control inputs, which allow for easy interfacing to microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST, which is also the point where the conversion is initiated. The AD7934-6 has 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. The AD7934-6 uses advanced design techniques to achieve very low power dissipation at high throughput rates. The part also features 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. No pipeline delay. 6. Accurate control of the sampling instant via a CONVST input and once off conversion control. Table 1. Related Devices Similar Device Number of Bits Number of Channels Speed AD7938/39 12/10 8 1.5 MSPS AD7933/34 10/12 4 1.5 MSPS AD7938-6 12 8 625 kSPS |
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