SC7107 datasheet(5/21 Pages) SILAN

Part #	SC7107

Description	3 DIGITS, LCD/LED DISPLAY, A/D CONVERTERS FOR DMM

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Manufacturer	SILAN [Silan Microelectronics Joint-stock]

Direct Link	http://www.silan.com.cn

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5 / 21 page

SC7106/7107

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.2

2006.02.27

Http: www.silan.com.cn

Page 5 of 22

DESIGN INFORMATION SUMMARY SHEET

OSCILLATOR FREQUENCY

fosc=0.45/RC; Cosc>50pF; Rosc>50k

Ω; fosc(Typ)=48kHz

OSCILLATOR PERIOD

tosc=RC/0.45

INTEGRATION CLOCK FREQUENCY

Fclock=fosc/4

INTEGRATION PERIOD

tINT=1000x(4/fosc)

60/50Hz REJECTION CRITERION

tINT/ t60Hz or tINT/ t50Hz=Integer

OPTIMUM INTEGRATION CURRENT

IINT=4

µA

FULL SCALE ANALOG INPUT

VOLTAGE

VINFS(Typ)=200mV or 2V

INTEGRATE RESISTOR

RINT=VINFS/IINT

INTEGRATE CAPACITOR

CINT=(tINT) (IINT)/VINT

INTEGRATOR OUTPUT VOLTAGE

SWING

VINT=(tINT) (IINT)/CINT

VINT MAXIMUM SWING

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

DISPLAY COUNT

COUNT=1000x (VIN/VREF)

CONVERSION CYCLE

tCYC=tCLOCKx4000; tCYC=toscx16000;

when fosc=48kHz; tCYC=333ms

COMMON MODE INPUT VOLTAGE

(V-+1V)<VIN<(V+-0.5V)

AUTO-ZERO CAPACITOR

0.01

µF<CAZ<1µF

REFERENCE CAPACITOR

0. 1

µF<CREF<1µF

VCOM

Biased between Vi 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.

SC7106 POWER SUPPLY: SINGLE 9V

V+ to V-=9V, digital supply is generated internally,

VGND

≈V+−4.5V

SC7106 DISPLAY: LCD

Type: Direct drive with digital logic supply amplitude.

SC7107 POWER SUPPLY:DUAL

±5.0V

V+=+5V TO GND, V-=-5V TO GND, Digital Logic and LED driver

supply V+ to GND

SC7107 DISPLAY: LED

Type: Non-Multiplexed Common Anode

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