ICL7136 datasheet(5/15 Pages) INTERSIL

5 / 15 page

FN3086.6

July 21, 2005

Typical Integrator Amplifier Output Waveform (INT Pin)

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 = 1µA

• FULL SCALE ANALOG INPUT VOLTAGE

VlNFS (Typ) = 200mV or 2V

• INTEGRATE RESISTOR

• INTEGRATE CAPACITOR

• INTEGRATOR OUTPUT VOLTAGE SWING

•VINT MAXIMUM SWING:

(V- + 0.5V) < VINT < (V+ - 0.5V), VINT (Typ) = 2V

• DISPLAY COUNT

• 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

0.01

µF < CAZ < 1µF

• REFERENCE CAPACITOR

0.1

µF < 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.

• POWER SUPPLY: SINGLE 9V

V+ - V- = 9V

Digital supply is generated internally

VTEST ≅ V+ - 4.5V

•DISPLAY: LCD

Type: Direct drive with digital logic supply amplitude.

RINT

VINFS

IINT

-----------------

CINT

tINT

() I

INT

()

VINT

--------------------------------

VINT

tINT

() I

INT

()

CINT

--------------------------------

COUNT

1000

VIN

VREF

---------------

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

ICL7136

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