TC7135 반도체 회로 부품 판매점
4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER
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 TelCom |
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TC7135
4-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTER
FEATURES
s Low Roll-Over Error ......................... ±1 Count Max
s Guaranteed Nonlinearity Error ........ ±1 Count Max
s Guaranteed Zero Reading for 0V Input
s True Polarity Indication at Zero for Null Detection
s Multiplexed BCD Data Output
s TTL-Compatible Outputs
s Differential Input
s Control Signals Permit Interface to UARTs and
µProcessors
s Auto-Ranging Supported With Overrange and
Underrange Signals
s Blinking Display Visually Indicates Overrange
Condition
s Low Input Current ............................................. 1 pA
s Low Zero Reading Drift ............................... 2 µV/°C
s Interfaces to TC7211A (LCD) and TC7212A (LED)
Display Drivers
s Available in DIP and Surface-Mount Packages
GENERAL DESCRIPTION
The TC7135 4-1/2 digit analog-to-digital converter (ADC)
offers 50 ppm (1 part in 20,000) resolution with a maximum
nonlinearity error of 1 count. An auto-zero cycle reduces zero
error to below 10 µV and zero drift to 0.5 µV/°C. Source
impedance errors are minimized by a 10 pA maximum input
current. Roll-over error is limited to ±1 count.
By combining the TC7135 with a TC7211A (LCD) or
TC7212A (LED) driver, a 4-1/2 digit display DVM or DPM can
be constructed. Overrange and underrange signals support
automatic range switching and special display blanking/flash-
ing applications.
Microprocessor-based measurement systems are sup-
ported by BUSY, STROBE, and RUN/HOLD control signals.
Remote data acquisition systems with data transfer via UARTs
are also possible. The additional control pins and multiplexed
BCD outputs make the TC7135 the ideal converter for dis-
play or microprocessor-based measurement systems.
ORDERING INFORMATION
2
3
4
Part No.
TC7135CBU
TC7135CLI
TC7135CPI
Package
64-Pin Plastic
Flat Package
28-Pin PLCC
28-Pin Plastic DIP
Temperature
Range
0°C to +70°C
5
0°C to +70°C
0°C to +70°C
TYPICAL 4-1/2 DIGIT DVM WITH LCD
4-1/2 DIGIT LCD
6.8 k Ω
+5V
+5V
TC04
0.1 µF
ANALOG
GROUND
1 µF
INPUT
0.1
µF
100 k Ω
–5V
1
V
28
UR
2
REF IN
27
OR
100 k Ω 3 ANALOG
0.47 µF
4
COMMON
INT OUT
26
STROBE
25
RUN/HOLD
1 µF 5
AZ IN
24
DGND
6
BUFF OUT
23
POL
100 k Ω
7
8
9
CC+RR– EEFF
–INPUT
22
CLOCK
21
BUSY
20
D1
10
+INPUT
19
D2
+5V 11 V +
18
D3
12
D5
17
D4
13
B1
TC7135
16
B8
14
B2
B4 15
1 16 15 14 12 5 3 4
CD4054A
7 8 13 11 10 9 2 6
120 Hz = 3 READING/SEC
CLOCK IN
1/4 CD4030
CD4081
+5V
SEGMENT
D
R
I
V
BACKPLANE
E
+5V
5 BP
1
V+
31 D1
32 D2
SEG
33 D3
OUT
34 D4
2,3,4
6–26
37–40
30 B3 TC7211A
29
B2
OSC 36
+5V
28
B1
OPTIONAL
CAP
27 B0
GND 35
6
7
8
TELCOM SEMICONDUCTOR, INC.
TC7135-10 11/6/96
3-113
4-1/2 DIGIT
ANALOG-TO-DIGITAL CONVERTER
TC7135
ABSOLUTE MAXIMUM RATINGS* (Note 1)
Positive Supply Voltage ............................................. +6V
Negative Supply Voltage .............................................–9V
Analog Input Voltage (Pin 9 or 10) ......... V+ to V– (Note 2)
Reference Input Voltage (Pin 2) ........................... V+ to V–
Clock Input Voltage .............................................. 0V to V+
Operating Temperature Range .................... 0°C to +70°C
Storage Temperature Range ................. –65°C to +160°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
Package Power Dissipation (TA ≤ 70°C)
Plastic DIP ........................................................ 1.14W
PLCC ................................................................ 1.00W
Plastic Flat Package .........................................1.14W
*Static-sensitive device. Unused devices must be stored in conductive
material to protect them 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.
ELECTRICAL CHARACTERISTICS: TA = +25°C, fCLOCK = 120 kHz, V+ = +5V, V– = –5V (Figure 1)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Analog
TCZ
TCFS
NL
DNL
±FSE
IIN
VN
Display Reading With
Zero Volt Input
Zero Reading Temperature
Coefficient
Full-Scale Temperature
Coefficient
Nonlinearity Error
Differential Linearity Error
Display Reading in
Ratiometric Operation
± Full-Scale Symmetry
Error (Roll-Over Error)
Input Leakage Current
Noise
Digital
IIL Input Low Current
IIH Input High Current
VOL Output Low Voltage
VOH Output High Voltage
B1, B2, B4, B8, D1–D5
Busy, Polarity, Overrange,
Underrange, Strobe
fCLK Clock Frequency
Power Supply
V+ Positive Supply Voltage
V– Negative Supply Voltage
I+ Positive Supply Current
I– Negative Supply Current
PD Power Dissipation
NOTES:
1. Limit input current to under 100µA if input
voltages exceed supply voltage.
2. Full-scale voltage = 2V.
3. VIN = 0V.
4. 0°C ≤ TA ≤ +70°C.
Notes 2 and 3
VIN = 0V
Note 4
VIN = 2V
Notes 4 and 5
Note 6
Note 6
VIN = VREF
Note 2
–VIN = +VIN
Note 7
Note 3
Peak-to-Peak Value Not
Exceeded 95% of Time
–0.0000 ±0.0000 +0.0000
— 0.5
2
——
5
—
—
+0.9996
0.5
0.01
+0.9999
1
—
+1.0000
— 0.5
1
— 1 10
— 15 —
VIN = 0V
VIN = +5V
IOL = 1.6 mA
IOH = 1 mA
IOH = 10 µA
Note 8
— 10 100
— 0.08 10
— 0.2 0.4
2.4 4.4
4.9 4.99
5
5
0 120 1200
456
–3 –5 –8
fCLK = 0 Hz
fCLK = 0 Hz
fCLK = 0 Hz
—1
3
— 0.7
3
— 8.5 30
5. External reference temperature coefficient less than 0.01 ppm/°C.
6. –2V ≤ VIN ≤ +2V. Error of reading from best fit straight line.
7. |VIN| = 1.9959.
8. Specification related to clock frequency range over which the
TC7135 correctly performs its various functions. Increased errors
result at higher operating frequencies.
Display
Reading
µV/°C
ppm/°C
Count
LSB
Display
Reading
Count
pA
µVP-P
µA
µA
V
V
V
kHz
V
V
mA
mA
mW
3-114
TELCOM SEMICONDUCTOR, INC.
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TC7135 converter
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상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
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