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TC7107 fiches techniques PDF

TelCom - 3-1/2 DIGIT A/D CONVERTERS

Numéro de référence TC7107
Description 3-1/2 DIGIT A/D CONVERTERS
Fabricant TelCom 
Logo TelCom 





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TC7107 fiche technique
1TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS
FEATURES
s Internal Reference with Low Temperature Drift
TC7106/7 ....................................... 80ppm/°C Typical
TC7106A/7A .................................. 20ppm/°C Typical
s Drives LCD (TC7106) or LED (TC7107) Display
Directly
s Guaranteed Zero Reading With Zero Input
s Low Noise for Stable Display
s Auto-Zero Cycle Eliminates Need for Zero
Adjustment
s True Polarity Indication for Precision Null
Applications
s Convenient 9 V Battery Operation (TC7106A)
s High Impedance CMOS Differential Inputs .... 1012
s Differential Reference Inputs Simplify Ratiometric
Measurements
s Low Power Operation ..................................... 10mW
ORDERING INFORMATION
PART CODE
TC710X X X XXX
}6 = LCD
7 = LED
A or blank*
R (reversed pins) or blank (CPL pkg only)
* "A" parts have an improved reference TC
Package Code (see below):
Package
Code Package
CKW
CLW
CPL
IPL
IJL
44-Pin PQFP
44-Pin PLCC
40-Pin PDIP
40-Pin PDIP
40-Pin CerDIP
Pin Layout
Formed Leads
Normal
Normal
Normal
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
– 25°C to +85°C
– 25°C to +85°C
AVAILABLE PACKAGES
40-Pin Plastic DIP
40-Pin CERDIP
GENERAL DESCRIPTION
The TC7106A and TC7107A 3-1/2 digit direct-display
drive analog-to-digital converters allow existing 7106/7107
based systems to be upgraded. Each device has a preci-
sion reference with a 20ppm/°C max temperature coeffi-
cient. This represents a 4 to 7 times improvement over
similar 3-1/2 digit converters. Existing 7106 and 7107 based
systems may be upgraded without changing external pas-
sive component values. The TC7107A drives common
anode light emitting diode (LED) displays directly with 8mA
per segment. A low-cost, high-resolution indicating meter
requires only a display, four resistors, and four capacitors.
The TC7106A low power drain and 9V battery operation
make it suitable for portable applications.
The TC7106A/TC7107A reduces linearity error to less
than 1 count. Rollover error – the difference in readings for
equal magnitude but opposite polarity input signals – is
below ±1 count. High impedance differential inputs offer
1pA leakage current and a 1012input impedance. The
differential reference input allows ratiometric measurements
for ohms or bridge transducer measurements. The
15µVP–P noise performance guarantees a “rock solid” read-
ing. The auto-zero cycle guarantees a zero display read-
ing with a zero-volts input.
2
3
4
5
+
ANALOG
INPUT
1M
0.01µF
0.1µF
34
CR+EF
31 VI+N
33
CREF
2–19
22–25
LCD DISPLAY (TC7106/A) OR
COMMON ANODE LED
DISPLAY (TC7107/A)
SEGMENT
DRIVE
30 VIN
32 ANALOG
COMMON
POL
BP
V+
20
MINUS SIGN
21
1
BACKPLANE
DRIVE
47k
0.22µF
28
VBUFF
TC7106/A
TC7107/A
0.47µF
V+REF 36
VREF
29 CAZ
V–REF 35 100mV
27 VINT
V26
OSC2 OSC3 OSC1
39 38 COSC 40
24k
1k
+
9V
TO ANALOG
COMMON (PIN 32)
ROSC 100pF
100k
3 CONVERSIONS/SEC
200mV FULL SCALE
6
7
Figure 1. TC7106/A/7/A Typical Operating Circuit
44-Pin Plastic Quad Flat
Package Formed Leads
44-Pin Plastic Chip
Carrier PLCC
TELCOM SEMICONDUCTOR, INC.
TC7106/6A/7/7A-7 11/4/96
3-183
8

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