Overview
The TLC7135CDWRG4 is a 4 1/2-digit precision analog-to-digital converter (ADC) manufactured by Texas Instruments using highly efficient CMOS technology. This dual-slope-integrating ADC is designed to provide interfaces to both microprocessors and visual displays, making it suitable for a wide range of applications requiring high precision and reliability.
The device is characterized by its low input current, high resolution, and minimal rollover error, ensuring accurate and stable conversions. It operates within a temperature range of 0°C to 70°C and is available in a 28-pin SOIC package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC+ with respect to VCC−) | 4 | 5 | 6 | V |
| Analog Input Voltage (IN− or IN+) | VCC− | VCC+ | V | |
| Reference Voltage Range | VCC− | VCC+ | V | |
| Clock Input Voltage Range | 0 | VCC+ | V | |
| Operating Free-Air Temperature Range | 0 | 70 | °C | |
| Input Leakage Current (IN− and IN+) | 1 | 10 | pA | |
| High-Level Output Voltage (D1-D5, B1, B2, B4, B8) | 2.4 | 5 | V | |
| Low-Level Output Voltage (D1-D5, B1, B2, B4, B8) | 0.4 | V | ||
| Zero Error | 10 µV | |||
| Zero Drift | 0.5 µV/°C | |||
| Rollover Error | ±1 Count |
Key Features
- Precision Null Detection: True polarity at zero with an accuracy limited only by system noise, ensuring an overall offset of less than 10 µV.
- Low Input Current: Typical input current of 1 pA, minimizing source-impedance errors.
- True Differential Input: Allows for precise measurement of differential voltages.
- Multiplexed Binary-Coded-Decimal (BCD) Output: Provides an interface for LED or LCD decoder/drivers and microprocessors.
- Control Signals: Includes BUSY, STROBE, RUN/HOLD, OVER RANGE, and UNDER RANGE signals for interfacing with microprocessors and UARTs.
- Autoranging Capability: With over-and under-range signals, enhancing the flexibility of measurement systems.
- TTL-Compatible Outputs: Ensures compatibility with a wide range of digital systems.
- Low Rollover Error: Limited to ±1 count, ensuring high accuracy in conversions.
Applications
- Measurement Systems: Ideal for precision measurement applications, including multimeters, data loggers, and other measurement instruments.
- Industrial Automation: Used in control and monitoring systems that require high precision and reliability.
- Medical Devices: Suitable for medical equipment that demands accurate and stable analog-to-digital conversions.
- Scientific Instruments: Employed in various scientific instruments where high precision and low noise are critical.
- Remote Data Acquisition Systems: Supports remote data acquisition with data transfer through UARTs.
Q & A
- What is the resolution of the TLC7135CDWRG4?
The TLC7135CDWRG4 offers a resolution of 50 ppm (one part in 20,000) with a maximum linearity error of one count.
- What is the typical input current of the TLC7135CDWRG4?
The typical input current is 1 pA, which minimizes source-impedance errors.
- What are the control signals available on the TLC7135CDWRG4?
The control signals include BUSY, STROBE, RUN/HOLD, OVER RANGE, and UNDER RANGE, which support microprocessor-based measurement systems and UARTs.
- What is the operating temperature range of the TLC7135CDWRG4?
The device operates within a temperature range of 0°C to 70°C.
- What type of output does the TLC7135CDWRG4 provide?
The device provides multiplexed binary-coded-decimal (BCD) output and digit-drive outputs for interfacing with LED or LCD decoder/drivers and microprocessors.
- How does the autoranging capability work on the TLC7135CDWRG4?
The autoranging capability is supported by over-and under-range signals, enhancing the flexibility of measurement systems.
- What is the rollover error of the TLC7135CDWRG4?
The rollover error is limited to ±1 count, ensuring high accuracy in conversions.
- Can the TLC7135CDWRG4 be used in remote data acquisition systems?
Yes, it supports remote data acquisition with data transfer through UARTs.
- What type of package is the TLC7135CDWRG4 available in?
The device is available in a 28-pin SOIC package.
- What are the recommended power supplies for the TLC7135CDWRG4?
The device is designed to work with ±5-V power supplies, but 5-V operation is possible when the input signal does not vary more than ±1.5 V from midsupply).
