ICL7126 View Datasheet(PDF) - Intersil
Part Name
Description
Manufacturer
ICL7126 Datasheet PDF : 15 Pages
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ICL7126
Design Information Summary Sheet
• OSCILLATOR FREQUENCY
fOSC = 0.45/RC
COSC > 50pF; ROSC > 50kΩ
fOSC (Typ) = 48kHz
• OSCILLATOR PERIOD
tOSC = RC/0.45
• INTEGRATION CLOCK FREQUENCY
fCLOCK = fOSC/4
• INTEGRATION PERIOD
tINT = 1000 x (4/fOSC)
• 60/50Hz REJECTION CRITERION
tINT/t60Hz or tlNT/t50Hz = Integer
• OPTIMUM INTEGRATION CURRENT
IINT = 4µA
• FULL-SCALE ANALOG INPUT VOLTAGE
VlNFS (Typ) = 200mV or 2V
• INTEGRATE RESISTOR
RINT
=
V-----I--N----F---S--
IINT
• INTEGRATE CAPACITOR
CINT
=
(---t--I--N----T----)--(--I--I--N----T----)
VINT
• INTEGRATOR OUTPUT VOLTAGE SWING
VINT
=
(---t--I--N----T----)--(--I--I--N----T----)
CINT
• VINT MAXIMUM SWING:
(V- + 0.5V) < VINT < (V+ - 0.5V), VINT (Typ) = 2V
• DISPLAY COUNT
COUNT
=
1000 × ---V-----I-N-----
VREF
• CONVERSION CYCLE
tCYC = tCL0CK x 4000
tCYC = tOSC x 16,000
when fOSC = 48KHz; tCYC = 333ms
• COMMON MODE INPUT VOLTAGE
(V- + 1V) < VlN < (V+ - 0.5V)
• AUTO-ZERO CAPACITOR
0.01µF < CAZ < 1µF
• REFERENCE CAPACITOR
0.1µF < CREF < 1µF
• VCOM
Biased between V+ and V-
• VCOM ≅ V+ - 2.8V
Regulation lost when V+ to V- < ≅6.8V;
If VCOM is externally pulled down to (V + to V -)/2,
the VCOM circuit will turn off
• ICL7126 POWER SUPPLY: SINGLE 9V
V+ - V- = 9V
Digital supply is generated internally
VTEST ≅ V+ - 4.5V
• ICL7126 DISPLAY: LCD
Type: Direct drive with digital logic supply amplitude
Typical Integrator Amplifier Output Waveform (INT Pin)
AUTO ZERO PHASE
(COUNTS)
2999 - 1000
SIGNAL INTEGRATE
PHASE FIXED
1000 COUNTS
DE-INTEGRATE PHASE
0 - 1999 COUNTS
TOTAL CONVERSION TIME = 4000 x tCLOCK = 16,000 x tOSC
5
FN3084.5
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