ES5120
3 3/4 DIGIT A/D CONVERTER
１．
GENERAL DESCRIPTION
The ES5120 is a 3 3/4 digit
measurement system which
combines integrating analog-to-digital converter, frequency counter,and
logic level tester in either 40-pin DIP package or 44-pin QFP
package
．
The high level of integration permits ES5120-based
instruments to deliver
higher performance and more features while
actually reducing parts count.
With a maximum range of 3999 counts, the ES5120 provides
10 times greater resolution in the 200mV to 400mV range than
traditional 3 1/2 digit meters. An autozero cycle guarantees a
zero reading with a 0V input. CMOS Processing reduces analog
input bias current to only 1PA. Rollover error, the difference
in readings for equal magnitude but opposite polarity input
signals, is less than
±
1 Count. Differential reference inputs
permit ratiometric measurements for ohms or bridge transducer
applications.
The ES5120's frequency counter option simplifies design
of an instrument which is well suited to both analog and digital
troubleshooting : voltage, current, and resistance measurements
plus precise frequency measurements to 4 MHz (higher frequencies
can be measured with an external prescaler) and a simple logic
probe. The frequency counter will automatically adjust its range
to match the input frequency, over a four decade range.
ES5120
3 3/4 DIGIT A/D CONVERTER
Two logic level measurement inputs permit a ES5120-based
meter to function as a logic probe. When combined with external
level shifters, the ES5120 will display logic levels on the LCD
display and also turn on a piezoelectric buzzer when the measured
logic level is low.
Other ES5120 features simplify instrument design and reduce
parts count. On-chip decimal point drivers are included, as is a
low battery detection annunciator. A piezoelectric buzzer can be
controlled with an external switch or by the logic probe inputs.
Two oscillator options are provided : A crystal can be used if
high accuracy frequency measurements are desired, or a simple RC
option can be used for low-end instruments.
A 'peak reading hold' input allows the ES5120 to retain
the highest A-D or frequency reading. This feature is useful in
measuring motor starting current, maximum temperature, and
similar applications.
The ES5120 operates from a single 9V battery, with typical
power of 16mW. Packages include a 40-pin DIP and 44-pin Flat
Package.
ES5120
3 3/4 DIGIT A/D CONVERTER
２．FEATURES
■
Multiple-Function Measurement System
Analog to digital Converter
Frequency Counter
Logic Probe
■
Frequency Counter
Measures Input Frequency to 4 MHz
Autoranging Over Four Decade Range
■
Logic Probe Inputs
2 LCD Annunciators
Buzzer Drive (with Two Types of Buzzer Frequencies, 5 KHz
and 2.5KHz, for choice)
■
Peak Reading Hold with LCD Annunciator
■
3 3/4 Digit(3999 Maximum) Resolution
■
Low Noise A-D Converter
Differential Inputs, 1 pA Bias Current
Differential Reference for Ratiometric Ohms
On-Chip Voltage Reference, 60 ppM/℃ Drift
■
No External LCD Drivers Required
Full 3 3/4 Digit Display
Displays "OL" for Input Overrange
ES5120
3 3/4 DIGIT A/D CONVERTER
Three Decimal Point and Polarity Drivers
LCD Annunciator Drive
Adjustable LCD Drive Voltage
■
Low Battery Detect with LCD Annunciator
■
On Chip Buzzer Driver and Control Input
■
Control Input Changes Full Scale Range by 10:1
■
Data Hold Input
■
Underrange and Overrange Outputs
■
Multiple Package Options
40-pin DIP Package
44-pin Flat Package
ES5120
3 3/4 DIGIT A/D CONVERTER
３．TYPICAL
APPLICATION
0
.
1
μF
