Low Cost, 4-Channel, 16-Bit

  Low Cost, 4-Channel, 16-Bit  1 MSPS PulSAR® ADC   AD7655     Rev.   A    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.  FEATURES   4-channel, 16-bit resolution ADC   2 track-and-hold amplifiers  Throughput:  1 MSPS (Normal mode)   888 kSPS (Impulse mode)  Analog input voltage range: 0 V to 5 V  No pipeline delay  Parallel and serial 5 V/3 V interface  SPI®/QSPI™/MICROWIRE™/DSP-compatible  Single 5 V supply operation  Power dissipation:  120 mW typical  2.6 mW @ 10 kSPS  Package: 48-lead quad flatpack (LQFP)  or 48-lead frame chip scale package (LFCSP)  Pin-to-pin compatible with the AD7654  Low cost    APPLICATIONS  AC motor control  3-phase power control  4-channel data acquisition  Uninterrupted power supplies  Communications    FUNCTIONAL BLOCK DIAGRAM  CONTROL LOGIC AND CALIBRATION CIRCUITRY A/B 16 D[15:0] BUSY CS SER/PAR OGND OVDD DGND DVDD SERIAL PORT BYTESWAP RD AVDD AGND REFx REFGND PD RESET CNVST INAN SWITCHED CAP DAC AD7655 INA1 IMPULSE MUX EOC INA2 A0 INB1 INBN INB2 TRACK/HOLD × 2 PARALLEL INTERFACE 03536-001 CLOCK MUX MUX   Figure 1.  Table 1. PulSAR® Selection  Type / kSPS  100 - 250  500 - 570   800 -  1000   1000   Pseudo  Differential   AD7660/61    AD7650/52 AD7664/66  AD7653 AD7667   True Bipolar   AD7663   AD7665 AD7671   True  Differential  AD7675 AD7676 AD7677 AD7621 18 Bit   AD7678 AD7679 AD7674 AD7641 Multichannel/  Simultaneous     AD7654 AD7655   GENERAL DESCRIPTION  The AD7655 1 i s a low cost, simultaneous sampling, dual- channel, 16-bit, charge redistribution SAR, analog-to-digital  converter that operates from a single 5 V power supply. It  contains two low noise, wide bandwidth, track-and-hold  amplifiers that allow simultaneous sampling, a high speed   16-bit sampling ADC, an internal conversion clock, error  correction circuits, and both serial and parallel system interface  ports. Each track-and-hold has a multiplexer in front to provide  a 4-channel input ADC. The A0 multiplexer control input  allows the choice of simultaneously sampling input pairs  ... zobacz całą notatkę