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TC811CKW fiches techniques PDF

Microchip Technology - 3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs

Numéro de référence TC811CKW
Description 3-1/2 Digit Analog-To-Digital Converter with Hold and Differential Reference Inputs
Fabricant Microchip Technology 
Logo Microchip Technology 





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TC811CKW fiche technique
TC811
3-1/2 Digit Analog-To-Digital Converter with Hold and
Differential Reference Inputs
FEATURES
s Differential Reference Input
s Display Hold Function
s Fast Over-Range Recovery, Guaranteed Next
Reading Accuracy
s Low Temperature Drift Internal
Reference ....................................... 35ppm/°C (Typ)
s Guaranteed Zero Reading With Zero Input
s Low Noise ..................................................... 15µVp-p
s High Resolution (0.05%) and Wide Dynamic
Range (72 dB)
s High Impedance Differential Input
s Low Input Leakage Current .................... 1pA (Typ)
10pA Max
s Direct LCD Drive -No External Components
s Precision Null Detection with True Polarity at Zero
s Crystal Clock Oscillator
s Available in DIP, Compact Flat Package or PLCC
s Convenient 9V Battery Operation with
Low Power Dissipation (600µA Typical, 1mW
Maximum)
FUNCTIONAL BLOCK DIAGRAM
TYPICAL APPLICATIONS
s Thermometry
s Digital Meters
— Voltage/Current/Power
— pH Measurement
— Capacitance/Inductance
— Fluid Flow Rate/Viscosity
— Humidity
— Position
s Panel Meters
s LVDT Indicators
s Portable Instrumentation
s Digital Scales
s Process Monitors
s Gaussometers
s Photometers
ORDERING INFORMATION
Part No.
TC811CKW
TC811CPL
Package
Temp.
Range
Max VREF
Temp. Co.
44-Pin PQFP 0°C to +70°C 75 ppm/°C
40-Pin Plastic DIP 0°C to +70°C 75 ppm/°C
TYPICAL SEGMENT OUTPUT
V+
0.5mA
2mA
SEGMENT
OUTPUT
LCD DISPLAY
TC811CPL
C
+
REF
CREF
VR+EF
VR–EF
35 36
33
RINT
C
REF
VBUFF
V+
34 28 38
10
µA
V
+
IN
31
INT
A/Z
ANALOG 32
COMMON
V
IN
30
INT
ZI & A/Z
ZI &
A/Z
+
ZI
DE DE
(–) (+)
DE (+) DE (–)
AZ & DE (±)
+
V+– 3.0V
26
V–
LOW
TEMPCO
VREF
INTERNAL DIGITAL GROUND
CAZ
CINT
VINT
29 27
INTEGRATOR
+
+
A/Z
TO
DIGITAL
SECTION
COMPARATOR
THOUSANDS
BACKPLANE
21
LCD SEGMENT DRIVERS
7 SEGMENT 7 SEGMENT 7 SEGMENT
DECODE
DECODE
DECODE
200
DATA LATCH
HUNDREDS
TENS
UNITS
TO SWITCH DRIVERS
FROM COMPARATOR OUTPUT
CLOCK
fOSC
4
70k
CONTROL LOGIC
40
OSC 1
39
22M
OSC2
INTERNAL DIGITAL GOUND
VTH
= 1V
1
HLDR
38 V+
6.2V
500
TEST
26 V–
10pF
V+
470k
20pF
V+
© 2001 Microchip Technology Inc. DS21472A
TC811-7 11/5/96

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