Document
REV. 4.2
FS970X-DS-42_EN
FEB 2007
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Datasheet
FS970X
5,000/50,000 counts DMM analog front end.
FS970X
Fortune Semiconductor Corporation 28F., No.27, Sec. 2, Zhongzheng E. Rd., Danshui Town, Taipei County 251, Taiwan Tel.:886-2-28094742 Fax:886-2-28094874 www.ic-fortune.com
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This manual contains new product information. Fortune Semiconductor Corporation reserves the rights to modify the product specification without further notice. No liability is assumed by Fortune Semiconductor Corporation as a result of the use of this product. No rights under any patent accompany the sale of the product.
Rev. 4.2
2/47
FS970X
Contents
1. 2.
GENERAL DESCRIPTION................................................................................................................... 5 FEATURES.......................................................................................................................................... 5 2.1 General Features (FS9701A/B as an example) ....................................................................... 5 Measurement Range (FS9701B as an example) ..................................................................... 6
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2.2 3. 4. 5. 6.
ORDERING INFORMATION................................................................................................................. 6 ELECTRICAL CHARACTERISTICS..................................................................................................... 6 BLOCK-DIAGRAM .............................................................................................................................. 8 PACKAGING & PINS........................................................................................................................... 8 6.1 6.2 LQFP 64 Pin Definition............................................................................................................ 8 Pin Description ....................................................................................................................... 9
7. 8.
TYPICAL APPLICATION CIRCUIT......................................................................................................10 REGULATOR......................................................................................................................................11 8.1 8.2 8.3 Low Voltage Detector.............................................................................................................12 Saving Mode ..........................................................................................................................12 On/Off Power Output..............................................................................................................13
9.
CLOCK AND BUZZER GENERATOR .................................................................................................14 9.1 9.2 Clock Generator.....................................................................................................................14 Buzzer Generator ...................................................................................................................15
10. FUNCTION NETWORK.......................................................................................................................16 10.1 10.2 10.3 10.4 10.5 Function Decoder ..................................................................................................................17 Fixed Voltage Generator ........................................................................................................18 Ω Power Supply .....................................................................................................................19 Multiplexers and pre-filter......................................................................................................20 Operation Amplifier and Comparator.....................................................................................22
11. ANALOG TO DIGITAL CONVERTER (ADC) .......................................................................................24 11.1 11.2 11.3 11.4 11.5 The operating theory of Σ-∆ ADC...........................................................................................24 Transfer Function & Non-ideal affect.....................................................................................24 Function Gain Setup ..............................................................................................................25 Digital Filter............................................................................................................................26 Reading and operation of ADC ..............................................................................................28
11.5.1 High-resolution, low-speed output ........................................................................................28 11.5.2 Low-resolution, high-speed output ................