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AD7265ASU Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7265ASU Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page Differential Input, Dual 1 MSPS, 12-Bit, 3-Channel SAR ADC Preliminary Technical Data AD7265 FEATURES Dual 12-bit, 3-channel ADC Fast throughput rate: 1 MSPS Specified for VDD of 2.7 V to 5.25 V Low power: 7 mW max at 1 MSPS with 3 V supplies 16.5 mW max at 1 MSPS with 5 V supplies Wide input bandwidth 70 dB SNR at 100 kHz input frequency On-chip reference: 2.5 V –40°C to +125°C operation Flexible power/throughput rate management Simultaneous conversion/read No pipeline delays High speed serial interface SPI®/QSPI™/MICROWIRE™/DSP compatible Shutdown mode: 1 µA max 32-lead LFCSP and TQFP packages GENERAL DESCRIPTION The AD7265 is a dual, 12-bit, high speed, low power, successive approximation ADC that operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 1 MSPS. The device contains two ADCs, each preceded by a 3-channel multi- plexer, and a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 10 MHz. The conversion process and data acquisition are controlled using standard control inputs, allowing easy interfacing to microproces- sors or DSPs. The input signal is sampled on the falling edge of CS; conversion is also initiated at this point. The conversion time is determined by the SCLK frequency. There are no pipelined delays associated with the part. The AD7265 uses advanced design techniques to achieve very low power dissipation at high throughput rates. With 5 V supplies and a 1 MSPS throughput rate, the part consumes ? mA maximum. The part also offers flexible power/throughput rate management when operating in sleep mode. The analog input range for the part can be selected to be a 0 V to VREF range or a 2VREF range with either straight binary or twos complement output coding. The AD7265 has an on-chip 2.5 V reference that can be overdriven if an external reference is pre- ferred. This external reference range is 100 mV to 2.5 V. The AD7265 is available in 32-lead lead frame chip scale (LFCSP) and thin flat quad (TQFP) lead package. FUNCTIONAL BLOCK DIAGRAM OUTPUT DRIVERS AGND DGND V B1 VA1 +5 AVdd DVdd REF SELECT DcapA DcapB DOUTA SCLK DOUTB AD7265 T/H OUTPUT DRIVERS CONTROL LOGIC 12-BIT SUCCESSIVE APPROXIMATION ADC 12-BIT SUCCESSIVE APPROXIMATION ADC T/H VA2 MUX V B2 MUX VDRIVE RANGE AGND REF BUF BUF VA3 VA4 V B3 V B4 DGND AGND VA5 VA6 V B5 V B6 DIFF/SE A0 A1 A2 Figure 1 PRODUCT HIGHLIGHTS 1. The AD7265 features two complete ADC functions that allow simultaneous sampling and conversion of two channels. Each ADC has 2 analog inputs, 3 fully differential pairs, or 6 single- ended channels as programmed. The conversion result of both channels is available simultaneously on separate data lines, or in succession on one data line if only one serial port is available. 2. High Throughput with Low Power Consumption The AD7265 offers a 1 MSPS throughput rate with ? mW maximum power consumption when operating at 3 V. 3. Flexible Power/Throughput Rate Management The conversion rate is determined by the serial clock, allowing power consumption to be reduced as conversion time is re- duced through an SCLK frequency increase. Power efficiency can be maximized at lower throughput rates if the part enters sleep between conversions. 4. No Pipeline Delay The part features two standard successive approximation ADCs with accurate control of the sampling instant via a CS input and once off conversion control. 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. PrA |
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