tc7135 Microchip Technology Inc., tc7135 Datasheet
tc7135
Manufacturer Part Number
tc7135
Description
4-1/2 Digit A/d Converter
Manufacturer
Microchip Technology Inc.
Datasheet
1.TC7135.pdf
(28 pages)
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Features
• Low Rollover Error: ±1 Count Max
• Nonlinearity Error: ±1 Count Max
• Reading for 0V Input
• True Polarity Indication at Zero for Null Detection
• Multiplexed BCD Data Output
• TTL-Compatible Outputs
• Differential Input
• Control Signals Permit Interface to UARTs and
• Blinking Display Visually Indicates Overrange
• Low Input Current: 1 pA
• Low Zero Reading Drift: 2 µV/°C
• Auto-Ranging Supported with Overrange and
• Available in PDIP and Surface-Mount Packages
Applications
• Precision Analog Signal Processor
• Precision Sensor Interface
• High Accuracy DC Measurements
Functional Block Diagram
© 2007 Microchip Technology Inc.
Microprocessors
Condition
Underrange Signals
Signal
Input
0.47 µF
Set V
+ 5V
V
Analog GND
100 kΩ
0.1 µF
REF
4-1/2 Digit A/D Converter
REF
IN
100 kΩ
= 1V
100 kΩ
1 µF
1 µF
5V
10
11
12
13
14
1
2
3
4
5
6
7
8
9
V–
REF IN
ANALOG
COMMON
INT OUT
AZ IN
BUFF OUT
C
C
–INPUT
+INPUT
V+
D5 (MSD)
B1 (LSB)
B2
REF
REF
–
+
TC7135
General Description
The TC7135 4-1/2 digit A/D 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. Rollover error is
limited to ±1 count.
Microprocessor-based measurement systems are
supported by the 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 display or
microprocessor-based measurement systems.
UNDERRANGE
OVERRANGE
DIGTAL GND
RUN/HOLD
POLARITY
CLOCK IN
(MSB) B8
(LSD) D1
STROBE
BUSY
D2
D3
D4
B4
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TC7135
Clock Input
120 kHz
DS21460D-page 1
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