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AD7890BN-2 Datasheet(PDF) 1 Page - Analog Devices |
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AD7890BN-2 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7890 © Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FEATURES Fast 12-Bit ADC with 5.9 s Conversion Time Eight Single-Ended Analog Input Channels Selection of Input Ranges: 10 V for AD7890-10 0 V to 4.096 V for AD7890-4 0 V to 2.5 V for AD7890-2 Allows Separate Access to Multiplexer and ADC On-Chip Track/Hold Amplifier On-Chip Reference High Speed, Flexible, Serial Interface Single Supply, Low Power Operation (50 mW max) Power-Down Mode (75 W typ) FUNCTIONAL BLOCK DIAGRAM SIGNAL SCALING* SIGNAL SCALING* SIGNAL SCALING* SIGNAL SCALING* SIGNAL SCALING* SIGNAL SCALING* SIGNAL SCALING* SIGNAL SCALING* M U X V DD REF OUT/ REF IN +2.5V REFERENCE AGND AGND DGND CLK IN SCLK DATA OUT DATA IN SMODE OUTPUT/CONTROL REGISTER MUX OUT CLOCK 12-BIT ADC SHA IN AD7890 C EXT CONVST V IN1 V IN2 V IN3 V IN4 V IN5 V IN6 V IN7 V IN8 2k Ω TRACKHOLD TFS RFS *NO SCALING ON AD7890-2 Power dissipation in normal mode is low at 30 mW typ and the part can be placed in a standby (power-down) mode if it is not required to perform conversions. The AD7890 is fabricated in Analog Devices’ Linear Compatible CMOS (LC 2MOS) process, a mixed technology process that combines precision bipolar cir- cuits with low power CMOS logic. The part is available in a 24-pin, 0.3" wide, plastic or hermetic dual-in-line package or in a 24-pin small outline package (SOIC). PRODUCT HIGHLIGHTS 1. Complete 12-Bit Data Acquisition System on a Chip The AD7890 is a complete monolithic ADC combining an eight-channel multiplexer, 12-bit ADC, +2.5 V reference and a track/hold amplifier on a single chip. 2. Separate Access to Multiplexer and ADC The AD7890 provides access to the output of the multiplexer allowing one antialiasing filter for eight channels—a consid- erable saving over the eight antialiasing filters required if the multiplexer was internally connected to the ADC. 3. High Speed Serial Interface The part provides a high speed serial interface for easy connection to serial ports of microcontrollers and DSP processors. GENERAL DESCRIPTION The AD7890 is an eight-channel 12-bit data acquisition system. The part contains an input multiplexer, an on-chip track/hold amplifier, a high-speed 12-bit ADC, a +2.5 V reference and a high speed, serial interface. The part operates from a single +5 V supply and accepts an analog input range of ±10 V (AD7890-10), 0 V to +4.096 V (AD7890-4) and 0 V to +2.5 V (AD7890-2). The multiplexer on the part is independently accessible. This allows the user to insert an antialiasing filter or signal condition- ing, if required, between the multiplexer and the ADC. This means that one antialiasing filter can be used for all eight chan- nels. Connection of an external capacitor allows the user to adjust the time given to the multiplexer settling to include any external delays in the filter or signal conditioning circuitry. Output data from the AD7890 is provided via a high speed bidi- rectional serial interface port. The part contains an on-chip con- trol register, allowing control of channel selection, conversion start and power-down via the serial port. Versatile, high speed logic ensures easy interfacing to serial ports on microcontrollers and digital signal processors. In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the AD7890 is also speci- fied for dynamic performance parameters including harmonic distortion and signal-to-noise ratio. LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System |
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