TC7107A Datasheet PDF - TelCom

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TC7107A
TelCom

Part Number TC7107A
Description 3-1/2 DIGIT A/D CONVERTERS
Page 19 Pages


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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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TC7106
TC7106A
TC7107
TC7107A
3-1/2 DIGIT A/D CONVERTERS
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) (TA 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
TC7107A
Supply Voltage
V+ ................................................................................................ +6 V
V............................................................................................... – 9 V
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) (TA 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.
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
Scale Factor
Temperature Coefficient
Supply Current (Does Not
Include LED Current For TC7107/A)
Test Conditions
VIN = 0.0 V
Full-Scale = 200.0mV
VIN = VREF
VREF = 100 mV
VI–N = +V+IN 200mV
Full-Scale = 200mV
or Full-Scale = 2.000 V
VCM = ±1V, VIN = 0V,
Full Scale = 200.0 mV
VIN = 0 V
Full-Scale = 200.0mV
VIN = 0 V
VIN = 0 V
“C” Device = 0°C to +70°C
VIN = 0 V
“I” Device = – 25°C to +85°C
VIN = 199.0mV,
“C” Device = 0°C to +70°C
(Ext. Ref = 0ppm°C)
VIN = 199.0mV
“I” Device = – 25°C to +85°C
VIN = 0
TC7106/A & TC7107/A
Min Typ Max
– 000.0 ±000.0 +000.0
999 999/1000 1000
– 1 ±0.2 +1
Unit
Digital
Reading
Digital
Reading
Counts
– 1 ±0.2 +1 Counts
— 50 — µV/V
— 15 — µV
— 1 10 pA
— 0.2
— 1.0
1 µV/°C
2 µV/°C
—1
5 ppm/°C
— — 20 ppm/°C
— 0.8 1.8 mA
3-184
TELCOM SEMICONDUCTOR, INC.



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3-1/2 DIGIT A/D CONVERTERS
TC7106
TC7106A
TC7107
TC7107A
1
ELECTRICAL CHARACTERISTICS (Cont.) (Note 3)
Parameters
Test Conditions
TC7106/A & TC7107/A
Min Typ Max Unit
Analog Common Voltage
(With Respect to Pos. Supply)
25kBetween Common
and Pos. Supply
2.7 3.05 3.35 V
Temp. Coeff. of
Analog Common
(With Respect
to Pos. Supply)
25kBetween Common
and Pos. Supply
0°C TA +70°C
("C", Commercial Temp. Range Devices)
7106A/7A
7106/7
20
80
50 ppm/°C
— ppm/°C
Temp. Coeff. of
25kBetween Common
Analog Common
and Pos. Supply
(With Respect
to Pos. Supply)
– 25°C TA 85°C
— — 75 ppm/°C
(“I,” Industrial Temp. Range Devices)
TC7106A ONLY Pk – Pk
V+ to V= 9V
4 5 6V
Segment Drive Voltage (Note 5)
TC7106A ONLY Pk – Pk
V+ to V= 9V
4 5 6V
Backplane Drive Voltage (Note 5)
TC7107A ONLY
V+ = 5.0V
5 8.0 — mA
Segment Sinking Current (Except Pin 19)
Segment Voltage = 3V
TC7107A ONLY
V+ = 5.0V
10 16 — mA
Segment Sinking Current (Pin 19)
Segment Voltage = 3V
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 TA = 25°C, fCLOCK = 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.
2
3
4
5
6
7
TELCOM SEMICONDUCTOR, INC.
8
3-185



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TC7106
TC7106A
TC7107
TC7107A
PIN CONFIGURATIONS
3-1/2 DIGIT A/D CONVERTERS
V+ 1
NORMAL PIN
40 OSC 1
D1 2 CONFIGURATION 39 OSC2
C1 3
38 OSC 3
B1 4
37 TEST
1's A1 5
36 VR+ EF
F1 6
G1 7
35 VR–EF
34 CR+EF
E1 8
33 CR–EF
D2 9
C2 10
32 ANALOG
COMMON
31 VI+N
10's
B2 11
TC7106ACPL
TC7107AIPL
30
V
IN
A2 12
29 CAZ
F2 13
28 VBUFF
E2 14
D3 15
27 VINT
26 V
100's
B3 16
F3 17
E3 18
25 G2
24 C3
23 A 3
100's
1000's
AB 4 19
22 G3
POL 20
21 BP/GND
(MINUS SIGN)
(7106A/7107A)
OSC1 1
40 V+
REVERSE PIN
OSC2 2 CONFIGURATION 39 D1
OSC 3 3
38 C1
TEST 4
VR+ EF 5
VR– EF
CR+ EF
CR– EF
6
7
8
ANALOG
COMMON
9
VI+N 10
V
IN
11
CAZ 12
TC7106AIJL
TC7107AIJL
37 B1
36 A1
35 F1
34 G1
33 E1
32 D2
31 C2
30 B2
29 A2
1's
10's
VBUFF 13
28 F2
VINT 14
V 15
27 E2
26 D3
100's
G2 16
C3 17
A 3 18
25 B3
24 F3
23 E3
100's
G3 19
22 AB4 1000's
BP/GND 20
(7106A/7107A)
21 POL
(MINUS SIGN)
6 5 4 3 2 1 44 43 42 41 40
44 43 42 41 40 39 38 37 36 35 34
F1 7
G1 8
E1 9
D2 10
C2 11
NC 12
B2 13
A2 14
F2 15
E2 16
D3 17
TC7106ACLW
TC7107ACLW
(PLCC)
39 REF LO
38 CREF
37 CREF
36 COMMON
35 IN HI
34 NC
33 IN LO
32 A/Z
31 BUFF
30 INT
29 V–
NC 1
NC 2
TEST 3
OSC3 4
NC 5
OSC2
OSC1
V+
6
7
8
D1 9
C1 10
B1 11
TC7106ACKW
TC7107ACKW
(FLAT PACKAGE)
33 NC
32 G2
31 C3
30 A3
29 G3
28 BP/GND
27 POL
26 AB4
25 E3
24 F3
23 B3
18 19 20 21 22 23 24 25 26 27 28
12 13 14 15 16 17 18 19 20 21 22
3-186
TELCOM SEMICONDUCTOR, INC.



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