1.

Introduction to FS501 Chip

FS501 is a high resolution analog-to-digital converter (ADC) chip. The core of this chip is an 18-bit resolution



ADC. Besides the  ADC, FS501 consists of switching circuits, operational amplifier (op amp), digital filter,

crystal oscillation circuits, digital control logic, and microprocessor interface. Under 5V working voltage, this

chip consumes 1.2mA power.

FS501 contains two op amps and several programmable ADC direct inputs. The input signals of the ADC and

the reference voltages are fully differential. This mechanism can measure the fully differential small signals.

The application includes electronic scale and infrared ear thermometer.

The FS501 ADC contains two digital filters. One is an 18-b/5Hz high resolution output, and the other is a

12-b/325Hz resolution output.

Table 1. FS501 IC Chip

IC Chip

Package

High Resolution

﹝

Bits/Hz﹞

Low Resolution

﹝

Bits/Hz﹞

Voltage Low Detector/

(Thermistor) Resistance Measuring

FS501F

LQFP44

18/5

12/325



Characteristics

•

Embed High resolution  ADC

•

Five 18-bit high resolution outputs per second

•

325 12-bit outputs per second

•

Embed two op amps

•

Embed a voltage regulator, input: 5 V, outputs: 2.5 V and 4V

•

Chip current is less than 1.2mA

•

With power saving mode

•

50/60 Hz noise distortion

•

Embed crystal oscillation circuits

•

Standard 4-bit parallel port interface, can be directly connected to microprocessor I/O ports

•

With four programmable ADC direct input channels