ICL7126 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

ICL7126

3 1/2 Digit, Low Power, Single Chip A/D Converter

Renesas Electronics 

ICL7216

Design Information Summary Sheet

• OSCILLATOR FREQUENCY

fOSC = 0.45/RC

COSC > 50pF; ROSC > 50k

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 = 4A

• FULL-SCALE ANALOG INPUT VOLTAGE

VlNFS (Typ) = 200mV or 2V

• INTEGRATE RESISTOR

RINT = V----I-I-I-NN----F-T--S--

• INTEGRATE CAPACITOR

CINT = ---t--I--N---V-T---I--N---I-T-I--N----T----

• INTEGRATOR OUTPUT VOLTAGE SWING

VINT = ---t--I--N---C-T---I--N---I-T-I--N----T----

• VINT MAXIMUM SWING:

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

• DISPLAY COUNT

COUNT = 1000  V---V--R---I-EN----F-

• 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F < CAZ < 1F

• REFERENCE CAPACITOR

0.1F < CREF < 1F

• 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

FN3084 Rev.5.00

Oct 25, 2004

Page 5 of 15

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