TC7106
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 .... 10
12
Ω
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/°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 10
12
Ω
input impedance. The
differential reference input allows ratiometric measurements
for ohms or bridge transducer measurements. The
15µV
P–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
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):
0.1µF
34
33
C–
LCD DISPLAY (TC7106/A) OR
COMMON ANODE LED
DISPLAY (TC7107/A)
2–19
22–25
POL
BP
V+
SEGMENT
DRIVE
20
21
1
24kΩ
28 V
BUFF
47kΩ
0.47µF
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
—
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
1MΩ
+
ANALOG
INPUT
–
0.01µF
31
+
C
REF
+
V
IN
REF
30
32
–
V
IN
ANALOG
COMMON
TC7106/A
TC7107/A
+
V
REF
1kΩ
9V
36
V+
REF
AVAILABLE PACKAGES
0.22µF
35 100mV
V–
REF
–
26
27
V
OSC
2
OSC
3
OSC
1
38 C
OSC
40
R
OSC
100pF
100kΩ
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.
3-1/2 DIGIT A/D CONVERTERS
TC7106
TC7106A
TC7107
TC7107A
ABSOLUTE MAXIMUM RATINGS*
TC7106A
Supply Voltage (V
+
to V
–
) ........................................... 15 V
Analog Input Voltage (either input) (Note 1) ......... V
+
to V
–
Reference Input Voltage (either input) ................. V
+
to V
–
Clock Input ........................................................ Test to V
+
Package Power Dissipation (Note 2) (T
A
≤
70°C)
CerDIP ..............................................................2.29W
Plastic DIP ........................................................1.23W
PLCC ................................................................1.23W
PQFP ................................................................1.00W
Operating Temperature
“C” Devices ............................................ 0°C to +70°C
“I” Devices ........................................ – 25°C to +85°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 60 sec) ................... 300°C
Analog Input Voltage (either input) (Note 1) ......... V
+
to V
–
Reference Input Voltage (either input) ................. V
+
to V
–
Clock Input ....................................................... GND to V
+
Power Dissipation (Note 2) (T
A
≤
70°C)
40-Pin CerDIP Package ...................................2.29W
40-Pin Plastic DIP ............................................. 1.23W
44-Pin PLCC .....................................................1.23W
44-Pin PQFP .................................................... 1.00W
Operating Temperature
“C” Devices ............................................ 0°C to +70°C
“I” Devices ........................................ – 25°C to +85°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
*Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions above those
indicated in the operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.
TC7107A
Supply Voltage
V
+ ................................................................................................
+6 V
V
– ...............................................................................................
– 9 V
ELECTRICAL CHARACTERISTICS
(Note 3)
Parameters
Zero Input Reading
Ratiometric Reading
Roll-Over Error (Difference in
Reading for Equal Positive and
Negative Reading Near Full-Scale)
Linearity (Max. Deviation From
Best Straight Line Fit)
Common-Mode
Rejection Ratio (Note 4)
Noise (Pk – Pk Value Not
Exceeded 95% of Time)
Leakage Current @ Input
Zero Reading Drift
Test Conditions
V
IN
= 0.0 V
Full-Scale = 200.0mV
V
IN
= V
REF
V
REF
= 100 mV
–
V
IN
= +V
+
≅
200mV
IN
TC7106/A & TC7107/A
Min
Typ
Max
– 000.0
999
–1
±000.0
999/1000
±0.2
+000.0
1000
+1
Unit
Digital
Reading
Digital
Reading
Counts
Scale Factor
Temperature Coefficient
Supply Current (Does Not
Include LED Current For TC7107/A)
Full-Scale = 200mV
or Full-Scale = 2.000 V
V
CM
=
±1V,
V
IN
= 0V,
Full Scale = 200.0 mV
V
IN
= 0 V
Full-Scale = 200.0mV
V
IN
= 0 V
V
IN
= 0 V
“C” Device = 0°C to +70°C
V
IN
= 0 V
“I” Device = – 25°C to +85°C
V
IN
= 199.0mV,
“C” Device = 0°C to +70°C
(Ext. Ref = 0ppm°C)
V
IN
= 199.0mV
“I” Device = – 25°C to +85°C
V
IN
= 0
–1
—
—
—
—
—
—
—
—
±0.2
50
15
1
0.2
1.0
1
—
0.8
+1
—
—
10
1
2
5
20
1.8
Counts
µV/V
µV
pA
µV/°C
µV/°C
ppm/°C
ppm/°C
mA
3-184
TELCOM SEMICONDUCTOR, INC.
3-1/2 DIGIT A/D CONVERTERS
TC7106
TC7106A
TC7107
TC7107A
ELECTRICAL CHARACTERISTICS
(Cont.) (Note 3)
Parameters
Analog Common Voltage
(With Respect to Pos. Supply)
Temp. Coeff. of
Analog Common
(With Respect
to Pos. Supply)
Temp. Coeff. of
Analog Common
(With Respect
to Pos. Supply)
TC7106A ONLY Pk – Pk
Segment Drive Voltage (Note 5)
TC7106A ONLY Pk – Pk
Backplane Drive Voltage (Note 5)
TC7107A ONLY
Segment Sinking Current (Except Pin 19)
TC7107A ONLY
Segment Sinking Current (Pin 19)
1
Test Conditions
25kΩ Between Common
and Pos. Supply
25kΩ Between Common
and Pos. Supply
0°C
≤
T
A
≤
+70°C
("C", Commercial Temp. Range Devices)
25kΩ Between Common
and Pos. Supply
– 25°C
≤
T
A
≤
85°C
(“I,” Industrial Temp. Range Devices)
V
+
to V
–
= 9V
V
+
to V
–
= 9V
V
+
= 5.0V
Segment Voltage = 3V
V
+
= 5.0V
Segment Voltage = 3V
TC7106/A & TC7107/A
Min
Typ
Max
2.7
3.05
3.35
Unit
V
2
3
4
5
6
7
7106A/7A
7106/7
20
80
50
—
ppm/°C
ppm/°C
—
4
4
5
10
—
5
5
8.0
16
75
6
6
—
—
ppm/°C
V
V
mA
mA
NOTES:
1. Input voltages may exceed the supply voltages provided the input current is limited to
±100µA.
2. Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
3. Unless otherwise noted, specifications apply to both the TC7106/A and TC7107/A at T
A
= 25°C, f
CLOCK
= 48 kHz. Parts are tested in the
circuit of Figure 1.
4. Refer to “Differential Input” discussion.
5. Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment. Frequency is 20 times
conversion rate. Average DC component is less than 50mV.
8
TELCOM SEMICONDUCTOR, INC.
3-185
3-1/2 DIGIT A/D CONVERTERS
TC7106
TC7106A
TC7107
TC7107A
PIN CONFIGURATIONS
V+
D1
C1
B1
1's
A1
F1
G1
E1
D2
1
2
3
4
5
6
7
8
9
40 OSC 1
NORMAL PIN
CONFIGURATION 39 OSC 2
38 OSC 3
37 TEST
+
36 V REF
–
35 VREF
+
34 CREF
–
33 CREF
32 ANALOG
COMMON
+
31 V IN
30 V –
IN
29 CAZ
28 VBUFF
27 V INT
26 V –
25 G
2
24 C 3
23 A 3
22 G 3
OSC 1
OSC 2
OSC 3
1
2
3
40 V +
REVERSE PIN
CONFIGURATION 39 D1
38 C1
37 B 1
36 A 1
35
F1
C2 10
10's
B 2 11
A 2 12
F2 13
E 2 14
D3 15
100's
B 3 16
F3 17
E 3 18
1000's
AB 4 19
POL 20
(MINUS SIGN)
TC7106ACPL
TC7107AIPL
TEST 4
+
V REF 5
–
VREF 6
+
CREF 7
–
CREF 8
ANALOG 9
COMMON
+
V IN 10
V – 11
IN
CAZ
12
1's
34 G1
33 E 1
32 D2
31 C2
TC7106AIJL
TC7107AIJL
30 B 2
29 A 2
28
F2
10's
VBUFF 13
V INT 14
V – 15
G 2 16
27 E 2
26 D3
25 B 3
24
F3
100's
100's
100's
C 3 17
A 3 18
G 3 19
23 E 3
22 AB 4
1000's
21 POL
(MINUS SIGN)
21 BP/GND
(7106A/7107A)
BP/GND 20
(7106A/7107A)
REF LO
REF HI
REF HI
OSC1
OSC2
OSC3
CREF
CREF
IN LO
BUFF
TEST
COM
IN HI
INT
35
A/Z
NC
C1
D1
V+
A1
B1
6
5
4
3
2
1
44
43
42
41
40
44
43
42
41
40
39
38
37
36
F1
G1
E1
D2
C2
NC
B2
A2
F2
E2
D3
7
8
9
10
11
12
13
14
15
16
17
TC7106ACLW
TC7107ACLW
(PLCC)
39
38
37
36
35
34
33
32
31
30
29
REF LO
CREF
CREF
COMMON
IN HI
NC
IN LO
A/Z
BUFF
INT
V–
NC
NC
TEST
OSC3
NC
OSC2
OSC1
V+
D1
C1
B1
1
2
3
4
5
6
7
8
9
10
11
TC7106ACKW
TC7107ACKW
(FLAT PACKAGE)
V–
34
33
32
31
30
29
28
27
26
25
24
23
NC
G2
C3
A3
G3
BP/GND
POL
AB4
E3
F3
B3
18
B3
19
F3
20
E3
21
AB4
22
POL
23
NC
24
BP/GND
25
G3
26
A3
27
C3
28
G2
12
A1
13
F1
14
G1
15
E1
16
D2
17
C2
18
B2
19
A2
20
F2
21
E2
22
D3
3-186
TELCOM SEMICONDUCTOR, INC.
3-1/2 DIGIT A/D CONVERTERS
TC7106
TC7106A
TC7107
TC7107A
PIN DESCRIPTION
Pin No.
40-Pin PDIP
(Normal)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
1
Pin No.
40-Pin PDIP
(Reverse)
(40)
(39)
(38)
(37)
(36)
(35)
(34)
(33)
(32)
(31)
(30)
(29)
(28)
(27)
(26)
(25)
(24)
(23)
(22)
(21)
(20)
(19)
(18)
(17)
(16)
(15)
(14)
(13)
(12)
2
Symbol
V
+
D
1
C
1
B
1
A
1
F
1
G
1
E
1
D
2
C
2
B
2
A
2
F
2
E
2
D
3
B
3
F
3
E
3
AB
4
POL
BP
GND
G
3
A
3
C
3
G
2
V
–
V
INT
V
BUFF
C
AZ
Description
Positive supply voltage.
Activates the D section of the units display.
Activates the C section of the units display.
Activates the B section of the units display.
Activates the A section of the units display.
Activates the F section of the units display.
Activates the G section of the units display.
Activates the E section of the units display.
Activates the D section of the tens display.
Activates the C section of the tens display.
Activates the B section of the tens display.
Activates the A section of the tens display.
Activates the F section of the tens display.
Activates the E section of the tens display.
Activates the D section of the hundreds display.
Activates the B section of the hundreds display.
Activates the F section of the hundreds display.
Activates the E section of the hundreds display.
Activates both halves of the 1 in the thousands display.
Activates the negative polarity display.
LCD Backplane drive output (TC7106A).
Digital ground (TC7107A).
Activates the G section of the hundreds display.
Activates the A section of the hundreds display.
Activates the C section of the hundreds display.
Activates the G section of the tens display.
Negative power supply voltage.
Integrator output. Connection point for integration capacitor. See
INTEGRATING CAPACITOR section for more details
Integration resistor connection. Use a 47kΩ resistor for a 200mV full-
scale range and a 470kΩ resistor for 2V full-scale range.
The size of the auto-zero capacitor influences system noise. Use a
0.47µF capacitor for 200mV full scale, and a 0.047µF capacitor for
2V full scale. See Paragraph on AUTO-ZERO CAPACITOR for more
details.
The analog LOW input is connected to this pin.
The analog HIGH input signal is connected to this pin.
This pin is primarily used to set the analog common-mode voltage
for battery operation or in systems where the input signal is
referenced to the power supply. It also acts as a reference voltage
source. See paragraph on ANALOG COMMON for more details.
See pin 34.
3
4
5
6
7
30
31
32
(11)
(10)
(9)
V
–
IN
+
V
IN
ANALOG
COMMON
33
(8)
C
–
REF
8
TELCOM SEMICONDUCTOR, INC.
3-187
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