ICL7135CPI Intersil, ICL7135CPI Datasheet

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ICL7135CPI

Manufacturer Part Number
ICL7135CPI
Description
IC CONV A/D 4 1/2 DIGIT 28-DIP
Manufacturer
Intersil
Datasheet

Specifications of ICL7135CPI

Rohs Status
RoHS non-compliant
Other names
ICL7135CPIIS
NT5015

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4
The Intersil ICL7135 precision A/D converter, with its
multiplexed BCD output and digit drivers, combines dual-
slope conversion reliability with ±1 in 20,000 count accuracy
and is ideally suited for the visual display DVM/DPM market.
The 2.0000V full scale capability, auto-zero, and auto-
polarity are combined with true ratiometric operation, almost
ideal differential linearity and true differential input. All
necessary active devices are contained on a single CMOS
lC, with the exception of display drivers, reference, and a
clock.
The ICL7135 brings together an unprecedented combination
of high accuracy, versatility, and true economy. It features
auto-zero to less than 10μV, zero drift of less than 1μV/
input bias current of 10pA (Max), and rollover error of less
than one count. The versatility of multiplexed BCD outputs is
increased by the addition of several pins which allow it to
operate in more sophisticated systems. These include
STROBE, OVERRANGE, UNDERRANGE, RUN/HOLD and
BUSY lines, making it possible to interface the circuit to a
microprocessor or UART.
Ordering Information
NOTES:
ICL7135CPI
ICL7135CPIZ
(Note 1)
1. Intersil Pb-free plus anneal products employ special Pb-free
2. Pb-free PDIPs can be used for through hole wave solder
1
NUMBER
/
material sets; molding compounds/die attach materials and
100% matte tin plate termination finish, which are RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations. Intersil Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the
Pb-free requirements of IPC/JEDEC J STD-020.
processing only. They are not intended for use in Reflow solder
processing applications.
PART
2
Digit, BCD Output, A/D Converter
ICL7135CPI
ICL7135CPIZ 0 to +70 28 Ld PDIP
MARKING
PART
®
RANGE
0 to +70 28 Ld PDIP
TEMP.
(°C)
1
Data Sheet
(Pb-free) (Note 2)
PACKAGE
DWG. #
E28.6
E28.6
1-888-INTERSIL or 1-888-468-3774
PKG.
o
C,
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Accuracy Guaranteed to ±1 Count Over Entire ±20000
• Guaranteed Zero Reading for 0V Input
• 1pA Typical Input Leakage Current
• True Differential Input
• True Polarity at Zero Count for Precise Null Detection
• Single Reference Voltage Required
• Overrange and Underrange Signals Available for Auto-
• All Outputs TTL Compatible
• Blinking Outputs Gives Visual Indication of Overrange
• Six Auxiliary Inputs/Outputs are Available for Interfacing to
• Multiplexed BCD Outputs
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
Counts (2.0000V Full Scale)
Range Capability
UARTs, Microprocessors, or Other Circuitry
NALOG COMMON
August 28, 2007
REFERENCE
All other trademarks mentioned are the property of their respective owners.
REF CAP +
BUFF OUT
REF CAP -
|
(MSD) D5
(LSB) B1
INT OUT
Intersil (and design) is a registered trademark of Intersil Americas Inc.
AZ IN
IN LO
IN HI
Copyright Intersil Americas Inc. 2000, 2004. All Rights Reserved
B2
V+
V-
10
11
12
13
14
1
2
3
4
5
6
7
8
9
TOP VIEW
ICL7135
(PDIP)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
UNDERRANGE
OVERRANGE
STROBE
R/H
DIGITAL GND
POL
CLOCK IN
BUSY
(LSD) D1
D2
D3
D4
(MSB) B8
B4
ICL7135
FN3093.4

ICL7135CPI Summary of contents

Page 1

... NUMBER MARKING (°C) ICL7135CPI ICL7135CPI PDIP ICL7135CPIZ ICL7135CPIZ PDIP (Note 1) (Pb-free) (Note 2) NOTES: 1. Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations ...

Page 2

Typical Application Schematic SET V = 1.000V REF - REF 2 100kΩ ANALOG 3 GND 4 0.47μF 27Ω 5 100kΩ 1μF 6 100kΩ 7 1μF 8 100K SIGNAL 9 INPUT 0.1μ ...

Page 3

Absolute Maximum Ratings Supply Voltage ...

Page 4

SET V = 1.000V REF V IN REF - REF 100kΩ 3 ANALOG GND ANALOG INT OUT 4 GND 0.47μF 27Ω 5 A-Z IN 100kΩ 1μF 6 BUF OUT 100kΩ REF CAP 1 7 1μF 8 REF ...

Page 5

Detailed Description Analog Section Figure 3 shows the Block Diagram of the Analog Section for the ICL7135. Each measurement cycle is divided into four phases. They are (1) auto-zero (AZ), (2) signal-integrate (INT), (3) de-integrate (DE) and (4) zero-integrator (Zl). ...

Page 6

Digital Section Figure 5 shows the Digital Section of the ICL7135. The ICL7135 includes several pins which allow it to operate conveniently in more sophisticated systems. These include: Run/HOLD (Pin 25) When high (or open) the A/D will free-run with ...

Page 7

Digit Drives (Pins 12, 17, 18, 19 and 20) Each digit drive is a positive going signal that lasts for 200 clock pulses. The scan sequence is D5 (MSD), D4, D3, D2, and D1 (LSD). All five digits are scanned ...

Page 8

The effect of the resistor is to introduce a small pedestal voltage on to the integrator output at the beginning of the reference integrate phase. By careful selection of the ratio between this resistor and ...

Page 9

Power Supplies The ICL7135 is designed to work from ±5V supplies. However, in selected applications no negative supply is required. The conditions to use a single +5V supply are: 1. The input signal can be referenced to the center of ...

Page 10

... Do’s and Don’ts of Applying A/D Converters Low Cost Digital Panel Meter Designs Building an Auto-Ranging DMM Using the 8052A/7103A A/D Converter Pair Display Driver Family Combines Convenience of Use with Microprocessor Interfaceability Basic Analog for Digital Designers Overcoming Common Mode Range Issues When Using Intersil Integrating Converters FN3093.4 ...

Page 11

REF VOLTAGE - ICL7135 2 REF ANALOG 3 COMMON 27Ω 4 INT OUT ANALOG 0.47μ GND IN 1μF 100kΩ 6 BUF OUT 100kΩ 7 RC1 1μF 8 RC2 9 INPUT LO 100kΩ 10 INPUT HI INPUT ...

Page 12

SERIAL OUTPUT TO RECEIVING UART TRO UART EPE IM6402/3 TBR ICL7135 RUN/HOLD POL FIGURE 13. ICL7135 TO UART INTERFACE 1Y PA0 EN 2Y PA1 ...

Page 13

Design Information Summary Sheet • CLOCK INPUT The ICL7135 does not have an internal oscillator. It requires an external clock. f (Typ) = 120kHz CLOCK • CLOCK PERIOD t = 1/f CLOCK CLOCK • INTEGRATION PERIOD t = 10,000 x ...

Page 14

Die Characteristics DIE DIMENSIONS: (120 mils x 130 mils) x 525μm ±25μm METALLIZATION: Type: Al Å Å ±1k Thickness: 10k Metallization Mask Layout (MSD) D5 (LSB (MSB ICL7135 PASSIVATION: ...

Page 15

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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