DMM Analog front end/Insulation

Features

•

60000 counts dual-slope SADC (2 cnvs/s.)

•

Input signal full scale: 630mV (Max. 63000 count)

•

Built-in 600 counts fast speed (x10) FADC

•

Fast ADC conversion rate: 20 times/s

•

100L LQFP package

•

3V DC regulated power supply

•

Support digital multi-meter function

*Voltage measurement (AC/DC)

*Current measurement (AC/DC)

*Dual mode for frequency with voltage or current

*Resistance measurement (600.00Ω – 60.000MΩ)

*Conductance measurement (60.00nS)

*Capacitance measurement (6.000nF – 60.00mF)

(Taiwan patent no.: 323347, 453443)

*Diode or continuity mode measurement

*Frequency counter with duty cycle display:

60.000Hz – 60.000MHz

5.0% – 95.0%

•

ADP mode (AC or DC mode is available)

•

3dB BW selectable for low pass filter at AC mode

(Taiwan

patent no.: 362409)

(China

patent no.: 1363073)

•

Band-gap reference voltage output

•

Peak-hold measurement

(Taiwan

patent no.:476418)

•

3-wire serial bus for MPU I/O port

•

MPU I/O power level selectable by external pins

•

On-chip buzzer driver and frequency selectable by

MPU command

•

High-crest-factor signal detection

(Taiwan

patent no.: 234661)

•

Multi-level battery voltage detection

•

Support sleep mode by external chip select pin

ES51998(60000counts)

Description

ES51998 is an analog frond end chip of

DMM built-in 60000(SADC)/600(FADC)

counts dual ADCs. The SADC is operated at

slower speed for higher resolution. The

FADC is operated at higher speed for lower

resolution. ES51998 provides voltage &

current (AC/DC) measurement, resistance

measurement, capacitance measurement,

diode/continuity measurement, frequency

measurement, duty cycle measurement and

voltage peak-hold function. An analog

switches network is built-in for insulation

resistance application. The ES51998 also

supports multi-level battery detection,

low-pass-filter feature for AC mode and dual

mode measurement for V+F & A+F. A 3-wire

serial bus for MPU I/O port will be used

easily for firmware design. Flexible function

design is supported for different kinds of

DMM or Clamp-on meter application.

.

Application

Clamp-on meter

Digital multi-meter

ver 1.7

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12/01/12