FS970X datasheet(5/46 Pages) FORTUNE

5 / 46 page

FS970X

Rev. 4.4

5/46

General Description

FS970X is a series of Digital Multi-function Meter (DMM) front-end chip. The core is a high resolution Σ-Δ ADC,

combined with function network, operation amplifier, comparator, digital filter, crystal oscillator circuit, digital

control logic and micro processor interface.

FS970X ADC includes not only high-resolution output to achieve accurate measurement, but high-speed ADC

output to display the bar graph of digital meter and to measure +/- peak hold.

Combined with a micro processor, FS970X can function as an auto-range DMM to measure DC/AC voltage,

DC/AC current, resistance, frequency, peak hold and diode, etc. In addition, it includes several sets of

programmable ADC direct input to expand product applicability (such as pressure function, temperature

function, etc….)

There are two operation amplifiers built in FS970X to act as high impedance buffer and DC/AC converter when

measuring AC voltage. These two amplifiers are with other functions as well even not acting as DC/AC

converter. One of them can be connected to external resistor to build a x10 amplify circuit. The reading from the

x10 signal into the ADC can still be of accuracy due to the excellent noise immunity of the amplifier.

FS9701B

5000 / 5

640 / 500



FS9704B

80000 / 5

640 / 800



Chart 1. FS970X A/B series chips

There are two different versions of FS970X with different specifications and functions. With the same micro

processor FSμP01 chip (programs), customers can easily and quickly develop different levels of DMM.

Features

General Features (FS9701A/B as an example)

1) Built-in high resolution Δ-Σ ADC

2) 5,000 counts, high-resolution low-speed input, 5 times / sec.

3) 500 counts, low resolution, high-speed input, 640 times / sec.

4) Built-in voltage regulator with 9V input, 3.2V output

5) Under DC voltage, power consumption is under 1.2mA

6) Standby saving mode

7) Low battery detection

8) Good CMRR at 50/60HZ

9) Built-in crystal oscillator circuit

10) 2.5 kHz beeper driver

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