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AD7750 Datasheet(PDF) 1 Page - Analog Devices |
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AD7750 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 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 AD7750 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., 1997 Product-to-Frequency Converter FUNCTIONAL BLOCK DIAGRAM DELAY 2.5V BAND GAP REFERENCE DTF HPF MULT S1 FS VDD DGND DTF LPF 2ND ORDER MODULATOR AGND REFOUT G1 ADC1 ADC2 REFIN V1+ AD7750 2ND ORDER MODULATOR x2 x16 V2+ S2 V1– V2– F2 CLKOUT F1 FOUT REVP CLKIN ACDC FEATURES Two Differential Analog Input Channels Product of Two Channels Voltage-to-Frequency Conversion on a Single Channel Real Power Measurement Capability < 0.2% Error Over the Range 400% Ibasic to 2% Ibasic Two or Four Quadrant Operation (Positive and Negative Power) Gain Select of 1 or 16 on the Current Channel (Channel 1) Choice of On-Chip or External Reference Choice of Output Pulse Frequencies Available (Pins F1 and F2) High Frequency Pulse Output for Calibration Purposes (FOUT) HPF on Current Channel for Offset Removal Single 5 V Supply and Low Power GENERAL DESCRIPTION The AD7750 is a Product-to-Frequency Converter (PFC) that can be configured for power measurement or voltage-to- frequency conversion. The part contains the equivalent of two channels of A/D conversion, a multiplier, a digital-to-frequency converter, a reference and other conditioning circuitry. Channel 1 has a differential gain amplifier with selectable gains of 1 or 16. Channel 2 has a differential gain amplifier with a gain of 2. A high- pass filter can be switched into the signal path of Channel 1 to remove any offsets. The outputs F1 and F2 are fixed width (275 ms) logic low going pulse streams for output frequencies less than 1.8 Hz. A range of output frequencies is available and the frequency of F1 and F2 is proportional to the product of V1 and V2. These outputs are suitable for directly driving an electromechanical pulse counter or full stepping two phase stepper motors. The outputs can be configured to represent the result of four-quadrant multi- plication (i.e., Sign and Magnitude) or to represent the result of a two quadrant multiplication (i.e., Magnitude Only). In this configuration the outputs are always positive regardless of the input polarities. In addition, there is a reverse polarity indicator output that becomes active when negative power is detected in the Magnitude Only Mode, see Reverse Polarity Indicator. The error as a percent (%) of reading is less than 0.3% over a dynamic range of 1000:1. The AD7750 is fabricated on 0.6 µ CMOS technology; a pro- cess that combines low power and low cost. PRODUCT HIGHLIGHTS 1. The part can be configured for power measurement or voltage-to-frequency conversion. 2. The output format and maximum frequency is selectable; from low-frequency outputs, suitable for driving stepper motors, to higher frequency outputs, suitable for calibration and test. 3. There is a reverse polarity indicator output that becomes active when negative power is detected in the Magnitude Only Mode. 4. Error as a % of reading over a dynamic range of 1000:1 is < 0.3%. |
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