Features
- Wide VIN range of 6V to 40V
- Adjustable output voltage from 2.5V to 12V
- Ensured 150mA output current
- Ultra low 18µA typical quiescent current
- Low 2µA of typical shutdown current
- ±1% accurate voltage reference (over temperature, load)
- Low dropout voltage of 295mV at 150mA
- Low 26µVRMS noise
- 40V tolerant logic level (TTL/CMOS) enable input
- Stable operation with 10µF output capacitor
- 5kV ESD HBM rated
- Thermal shutdown and current limit protection
- Thermally enhanced 14 Ld exposed pad HTSSOP package
ICL7135 Functional Diagram
Description
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/oC, 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.
| Part Number | Status | Samples | Stock | RoHS | Package | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Pb (Lead) Free | Pb Free Category | Temp. Range (°C) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ICL7135CPIZ | Obsolete | N/A | In Stock | RoHS:EN | PDIP | 28# | Tube | Not Applicable | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | 0 to +70°C |
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- Application NotePDF 374 KB an017 Dec 13, 2001AI-generated Summary: The document analyzes the ICL7135 integrating A/D converter's performance, focusing on errors such as offset due to charge injection, rollover errors from stray capacitance, buffer nonlinearity, and comparator delay. It explains capacitor leakage, charge injection effects, and dielectric absorption impacts. The maximum clock frequency is limited by comparator delay but can be extended with compensation. Noise characteristics and methods to reduce noise via buffer gain are also discussed.
- Application NotePDF 458 KB an016 Dec 13, 2001AI-generated Summary: Successive approximation A/D converters perform high-speed conversions by testing bits from MSB to LSB using a DAC and comparator. They offer fast conversion rates but require critical components, sample and hold circuits, and can have missing codes. Accuracy depends on gain, offset, and temperature coefficients, with typical errors within ±2 LSB over temperature. Input signal slew rate limits accuracy, often necessitating sample and hold circuits. Selecting a converter involves evaluating bits, error budget, input characteristics, aperture time, measurement frequency, microprocessor compatibility, and multiplexing needs.
- Application NotePDF 503 KB an9675 Aug 13, 1999AI-generated Summary: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
- Application NotePDF 616 KB an028 Apr 22, 1999AI-generated Summary: The document explains the design of an auto-ranging digital multimeter using the ICL7103A/ICL8052A A/D converter pair. It details the decimal point logic controlled by a shift register to indicate measurement scales, and the use of rotary switches and transistors for range switching. The SN74195 shift register manages auto-ranging by shifting a zero bit to select the appropriate relay and decimal point. Schematics illustrate the precision rectifier, low pass filter, and auto-ranging circuitry.
- Application NotePDF 1.57 MB an054 Mar 30, 1999AI-generated Summary: The document details the functionality and interface of Renesas display driver families, including ICM7211, ICM7212, and ICM7235, which support microprocessor interfacing for LCD and LED displays. It explains how these drivers decode BCD inputs to 7-segment outputs and enable independent digit control for multi-digit displays. Multiplexed LED displays using ICM7218 devices are also described, highlighting their reduced pin count and support for common anode and cathode types. The document covers addressing modes, power-saving shutdown features, and applications in system status panels and bar graph displays.
- Application NotePDF 529 KB an023 Mar 30, 1999AI-generated Summary: This document details low-cost digital panel meter designs with instructions for LCD and LED kits using ICL7106 and ICL7107. It covers component values for full-scale options, LCD segment drive methods, LED display characteristics, clock oscillator setup for noise rejection, reference voltage configurations including external references, power supply requirements, input filtering, and preliminary test procedures such as auto zero and over-range indications. It also discusses capacitor selection and provides circuits for generating negative supply voltages.
- Application NotePDF 289 KB an018 Mar 30, 1999AI-generated Summary: Thermal effects in integrated circuits can cause offset voltage and matching errors, influenced by power dissipation and supply choices. Using the maximum input scale reduces errors, especially in successive approximation converters. Digital inputs should be tied to prevent stray spikes, and power supplies must be properly bypassed and protected. Most A/D converters have internal autozero circuits, requiring only full scale adjustment for accuracy. Safety, quality grades, and legal disclaimers emphasize proper use and responsibility.
- Application NotePDF 1.08 MB an002 Nov 19, 1998AI-generated Summary: Data acquisition and conversion involve quantization, where the smallest resolvable analog difference (quantum) depends on the full scale range and resolution. Quantization introduces an irreducible error called quantizing error or noise. Aperture time, the conversion time uncertainty, causes amplitude errors when signals change during conversion. Sample-hold circuits reduce aperture time by storing sampled signals. The Sampling Theorem states that sampling frequency must be at least twice the highest signal frequency to avoid distortion from frequency folding or aliasing. Natural binary code is commonly used for digital representation in converters, with the most and least significant bits defining the code's resolution and value.
- Application NotePDF 299 KB an9609 Aug 19, 1998AI-generated Summary: The document addresses common mode range issues in integrating converters by analyzing operational amplifier configurations and their impact on ADC input measurements. It explains how output voltage relates to input voltage and common mode voltage, demonstrating a method to display battery voltage correctly despite measurement offsets. The document also includes important legal notices about product usage, liability disclaimers, quality grades, and compliance with regulations. Contact information for Renesas Electronics sales offices worldwide is provided.
- Application NotePDF 508 KB an9510 Aug 19, 1998AI-generated Summary: The document explains fundamental analog circuit concepts for digital designers, focusing on superposition, Thevenin equivalent circuits, and feedback principles. It details the operation and assumptions of inverting and non-inverting op amps, differential amplifiers, and the use of T networks in feedback paths. The text highlights the importance of feedback in controlling closed-loop gain and stability, and distinguishes between voltage and current feedback op amps, especially in high-frequency applications like video amplifiers.
- Application NotePDF 287 KB an9705 Feb 21, 1997AI-generated Summary: Coherent sampling requires the ratio of signal frequency to sampling frequency to be a rational number, expressed as ko/N. When this condition is not met, frequency smearing occurs across bins. Data Acquisition Systems (DAS) can mitigate this by windowing, fixing sampling frequency and tuning input frequency, or fixing input frequency and tuning sampling frequency. The latter two methods are practical for most systems. Pseudo-code illustrates the frequency response for non-integer ko values.
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- Application NotePDF 374 KB an017 Dec 13, 2001AI-generated Summary: The document analyzes the ICL7135 integrating A/D converter's performance, focusing on errors such as offset due to charge injection, rollover errors from stray capacitance, buffer nonlinearity, and comparator delay. It explains capacitor leakage, charge injection effects, and dielectric absorption impacts. The maximum clock frequency is limited by comparator delay but can be extended with compensation. Noise characteristics and methods to reduce noise via buffer gain are also discussed.
- Application NotePDF 458 KB an016 Dec 13, 2001AI-generated Summary: Successive approximation A/D converters perform high-speed conversions by testing bits from MSB to LSB using a DAC and comparator. They offer fast conversion rates but require critical components, sample and hold circuits, and can have missing codes. Accuracy depends on gain, offset, and temperature coefficients, with typical errors within ±2 LSB over temperature. Input signal slew rate limits accuracy, often necessitating sample and hold circuits. Selecting a converter involves evaluating bits, error budget, input characteristics, aperture time, measurement frequency, microprocessor compatibility, and multiplexing needs.
- Application NotePDF 503 KB an9675 Aug 13, 1999AI-generated Summary: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
- Application NotePDF 616 KB an028 Apr 22, 1999AI-generated Summary: The document explains the design of an auto-ranging digital multimeter using the ICL7103A/ICL8052A A/D converter pair. It details the decimal point logic controlled by a shift register to indicate measurement scales, and the use of rotary switches and transistors for range switching. The SN74195 shift register manages auto-ranging by shifting a zero bit to select the appropriate relay and decimal point. Schematics illustrate the precision rectifier, low pass filter, and auto-ranging circuitry.
- Application NotePDF 1.57 MB an054 Mar 30, 1999AI-generated Summary: The document details the functionality and interface of Renesas display driver families, including ICM7211, ICM7212, and ICM7235, which support microprocessor interfacing for LCD and LED displays. It explains how these drivers decode BCD inputs to 7-segment outputs and enable independent digit control for multi-digit displays. Multiplexed LED displays using ICM7218 devices are also described, highlighting their reduced pin count and support for common anode and cathode types. The document covers addressing modes, power-saving shutdown features, and applications in system status panels and bar graph displays.View More (11)
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