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AD7887 Datasheet(PDF) 1 Page - Analog Devices |
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AD7887 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page REV. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7887 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 +2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead SOIC FUNCTIONAL BLOCK DIAGRAM SAR + ADC CONTROL LOGIC GND AIN0 SCLK DOUT DIN VDD AD7887 CS T/H I/P MUX BUF CHARGE REDISTRIBUTION DAC COMP VREF/AIN1 SOFTWARE CONTROL LATCH VREF/ AIN1 2.5V REF SPORT FEATURES Specified for VDD of +2.7 V to +5.25 V Flexible Power/Throughput Rate Management Shutdown Mode: 1 A Max One/Two Single-Ended Inputs Serial Interface: SPI™/QSPI™/MICROWIRE™/DSP Compatible 8-Lead Narrow SOIC and SOIC Packages APPLICATIONS Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Instrumentation and Control Systems High Speed Modems GENERAL DESCRIPTION The AD7887 is a high speed, low power, 12-bit ADC that oper- ates from a single +2.7 V to +5.25 V power supply. The AD7887 is capable of 125 kSPS throughput rate. The input track-and- hold acquires a signal in 500 ns and features a single-ended sampling scheme. The output coding for the AD7887 is straight binary and the part is capable of converting full power signals up to 2.5 MHz. The AD7887 can be configured for either dual or single chan- nel operation, via the on-chip Control Register. There is a default single-channel mode that allows the AD7887 to be operated as a read-only ADC. In single-channel operation, there is one analog input (AIN0) with the VREF/AIN1 pin as- suming its VREF function. This VREF pin allows the user access to the part’s internal +2.5 V reference, or the VREF pin can be overdriven by an external reference to provide the reference voltage for the part. This external reference voltage has a range of +2.5 V to VDD. The analog input range on AIN0 is 0 to +VREF. In dual-channel operation, the VREF/AIN1 pin assumes its AIN1 function, providing a second analog input channel. In this case, the reference voltage for the part is provided via the VDD pin. As a result, the input voltage range on both the AIN0 and AIN1 inputs is 0 to VDD. CMOS construction ensures low power dissipation of typically 2 mW for normal operation and 3 µW in power-down mode. The part is available in an 8-lead, 0.15-inch-wide narrow body SOIC and an 8-lead µSOIC package. PRODUCT HIGHLIGHTS 1. Smallest 12-bit dual/single-channel ADC; 8-lead µSOIC package. 2. Lowest power 12-bit dual/single-channel ADC. 3. Flexible power management options including automatic power-down after conversion. 4. Read-Only ADC capability. 5. Analog input range from 0 V to VREF. 6. Versatile serial I/O port (SPI/QSPI/MICROWIRE/DSP compatible). SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corporation. |
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