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DM74LS353  DM74LS353N  DM74LS353M  
ES51990 DMM Analog front end
Prototype PCB
Part No.:   ES51990
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Description:   DMM Analog front end
File Size :   765 K    
Page : 26 Pages
Logo:   
Maker   CYRUSTEK [ Cyrustek corporation ]http://www.cyrustek.com.tw
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100%
ES51990(6000counts)
DMM Analog front end
Features
6000 counts dual-slope SADC (2-5 cnvs/s.)
Input signal full scale: 630mV (Max. 6300 count)
Built-in 600 counts fast speed (x10) FADC
Fast ADC conversion rate: 20-50 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 (600.0Ω – 60.00MΩ)
*Capacitance measurement (6.000nF – 60.00mF)
(Taiwan patent no.: 323347, 453443)
*Diode or continuity mode measurement
*Frequency counter with duty cycle display:
60.00Hz – 60.00MHz
5% – 95%
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
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
Description
ES51990 is an analog frond end chip of
DMM built-in 6000(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. ES51990 provides voltage &
current (AC/DC) measurement, resistance
measurement, capacitance measurement,
diode/continuity measurement, frequency
measurement, and duty cycle measurement.
The ES51990 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 2.8
1
12/01/12
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