ES5120
3 3/4 DIGIT A/D CONVERTER
Pin No. Pin No.
(40-pin (44-pin Flat
Package) Package) Symbol Descrlption
26
24
V-
Negative supply connection. Connect to negative terminal of 9V
battery.
Analog circuit ground reference point. Nominally 3.3V below V＋.
27
28
29
30
31
32
33
34
35
36
25
26
27
28
29
30
31
32
33
34
35
COM
+
CREF
Positive connection for reference capacitor.
Negative connection for reference capacitor.
High differential reference input connection.
Low differential reference input connection.
Low analog input signal connection.
-
CREF
+
VREF
-
VREF
-
VIN
+
VIN
High analog input signal connection.
VBUFF
CAZ
Buffer output. Connect to integration resistor.
Autozero capacitor connection.
VINT
Integrator output. Connect to integration capacitor.
EOC/
Bidirectional pin. Pulses low (i.e. from V+ to DGND) at the end of
each conversion. If connected to V+, conversions will continue but
the display is not updated.
HOLD
37
38
39
40
36
37
38
39
OSC1
OSC2
OSC3
V+
Crystal oscillator (input) connection.
Crystal oscillator (output) connection.
RC oscillator connection.
Positive power supply connection. Typically 9V.
CYRUSTEK [ Cyrustek corporation ]
