TC7106/7 ....................................... 80ppm/
TC7106A/7A .................................. 20ppm/
High Impedance CMOS Differential Inputs .... 10
鈩?/div>
s
Differential Reference Inputs Simplify Ratiometric
Measurements
s
Low Power Operation ..................................... 10mW
1
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/擄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 鈥?the difference in readings for
equal magnitude but opposite polarity input signals 鈥?is
below
鹵1
count. High impedance differential inputs offer
1pA leakage current and a 10
12
鈩?/div>
input impedance. The
differential reference input allows ratiometric measurements
for ohms or bridge transducer measurements. The
15碌V
P鈥揚
noise performance guarantees a 鈥渞ock solid鈥?read-
ing. The auto-zero cycle guarantees a zero display read-
ing with a zero-volts input.
2
3
4
5
6
7
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):
0.1碌F
34
33
C鈥?/div>
LCD DISPLAY (TC7106/A) OR
COMMON ANODE LED
DISPLAY (TC7107/A)
2鈥?9
22鈥?5
POL
BP
V+
SEGMENT
DRIVE
20
21
1
24k鈩?/div>
28 V
BUFF
47k鈩?/div>
0.47碌F
29
C
AZ
V
INT
39
MINUS SIGN
BACKPLANE
DRIVE
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
鈥?/div>
Normal
Normal
Normal
Temperature
Range
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
鈥?25擄C to +85擄C
鈥?25擄C to +85擄C
1M鈩?/div>
+
ANALOG
INPUT
鈥?/div>
0.01碌F
31
+
C
REF
+
V
IN
REF
30
32
鈥?/div>
V
IN
ANALOG
COMMON
TC7106/A
TC7107/A
+
V
REF
1k鈩?/div>
9V
36
V+
REF
AVAILABLE PACKAGES
0.22碌F
35 100mV
V鈥?/div>
REF
鈥?/div>
26
27
V
OSC
2
OSC
3
OSC
1
38 C
OSC
40
R
OSC
100pF
100k鈩?/div>
TO ANALOG
COMMON (PIN 32)
3 CONVERSIONS/SEC
200mV FULL SCALE
40-Pin Plastic DIP
40-Pin CERDIP
Figure 1. TC7106/A/7/A Typical Operating Circuit
44-Pin Plastic Quad Flat
Package Formed Leads
44-Pin Plastic Chip
Carrier PLCC
TC7106/6A/7/7A-7
11/4/96
8
3-183
TELCOM SEMICONDUCTOR, INC.
TC7106AIJL 產(chǎn)品屬性
Microchip
ADC（模數(shù)轉(zhuǎn)換器）
1
1
Dual Slope
3.5 bit
Voltage
LCD
Yes
Internal, External
2290 mW
+ 85 C
Through Hole
CDIP-40
- 25 C
5 V
10
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