Advanced Digital Voltmeter Using Controller 8051

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TC7106/A/TC7107/A
3-1/2 Digit Analog-to-Digital Converters
Features:

General Description:

• Internal Reference with Low Temperature Drift:
- TC7106/7: 80ppm/°C Typical
- TC7106A/7A: 20ppm/°C Typical
• Drives LCD (TC7106) or LED (TC7107)
Display Directly
• Zero Reading with Zero Input
• Low Noise for Stable Display
• Auto-Zero Cycle Eliminates Need for Zero
Adjustment
• True Polarity Indication for Precision Null
Applications
• Convenient 9V Battery Operation (TC7106A)
• High-Impedance CMOS Differential Inputs: 1012Ω
• Differential Reference Inputs Simplify Ratiometric
Measurements
• Low-Power Operation: 10mW

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 precision reference with a 20ppm/°C max temperature coefficient. 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 passive 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.

Applications:
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells, Null
Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation

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 1012Ω input impedance. The differential reference input allows ratiometric measurements for ohms or bridge transducer
measurements. The 15μVP–P noise performance
ensures a “rock solid” reading. The auto-zero cycle
ensures a zero display reading with a zero volts input.

Device Selection Table
Package
Code

Package

Pin Layout

Temperature
Range

Normal

0°C to +70°C

CPI

40-Pin PDIP

IPL

40-Pin PDIP

Normal

-25°C to +85°C

IJL

40-Pin CERDIP

Normal

-25°C to +85°C

CKW

44-Pin PQFP

Formed
Leads

0°C to +70°C

CLW

44-Pin PLCC



0°C to +70°C

© 2006 Microchip Technology Inc.

DS21455C-page 1

TC7106/A/TC7107/A
Package Type
40-Pin PDIP

40-Pin CERDIP
40 OSC1

OSC1

1

39

OSC2

OSC2

2

V+
D1

2

C1

3

38 OSC3

OSC3

3

38 C1

B1

4

37 TEST

TEST

4

37 B1

A1

5

36 VREF+

VREF+

5

36 A1

F1

6

35 VREF-

VREF-

6

35

G1

7

34 CREF+

CREF+ 7

E1

8

33 CREF-

CREF-

D2

1's

1

9

Normal Pin
Configuration

TC7106ACPL
TC7107AIPL

8

ANALOG 9
COMMON
VIN+ 10

C2 10
10's

32 ANALOG
COMMON
31 VIN+

B2 11

30 VIN29 CAZ

TC7106AIJL
TC7107AIJL

CAZ 12

A2

F2 13

28 VBUFF

E2

27 VINT

40 V+
39 D1

33 E1
32 D2
31 C2
30 B2

28

F2

27 E2

V-

15

26 D3

25 G2

G2

16

25 B3

F3 17

24 C3

C3

17

24

E3

18

23 A3

A3

18

23 E3

AB4

1000's

10's

29 A2

VBUFF 13
VINT 14

19

22 G3

14

D3 15
100's

1's

F1

34 G1

VIN- 11

12

Reverse
Configuration

26 V-

B3

16

100's

G3 19

21 BP/GND
(7106A/7107A)

POL 20
(Minus Sign)

100's

100's

F3
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