4 1/2 Digit, BCD Output, A/D Converter The ICL7135CPI is a precision analog-to-digital converter (ADC) manufactured by Texas Instruments (TI). Below are its key specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Resolution:** 4½ digits (equivalent to 14-bit binary resolution).
- **Input Voltage Range:** ±2V (full-scale).
- **Conversion Rate:** Up to 3 conversions per second (typical).
- **Supply Voltage:** Single +5V supply (typical).
- **Power Consumption:** Low power (typically 1mW).
- **Reference Voltage:** External reference required (typically 1V).
- **Operating Temperature Range:** 0°C to +70°C (commercial grade).
- **Package Type:** 28-pin PDIP (Plastic Dual In-line Package).
- **Input Impedance:** >10⁹Ω (high input impedance).
- **Auto-Zeroing:** True differential input with auto-zero.
- **Output:** Multiplexed BCD output with strobe signals.
### **Descriptions:**
- The ICL7135CPI is a high-precision, low-power, 4½-digit ADC designed for digital panel meters and instrumentation.
- It features true differential inputs and auto-zeroing for accurate measurements.
- The device includes an internal digital-to-analog converter (DAC) and control logic for direct interfacing with displays.
- It is commonly used in applications requiring high-resolution measurements, such as digital multimeters and data acquisition systems.
### **Features:**
- **True Polarity Reading:** Measures both positive and negative voltages.
- **Auto-Zero Cycle:** Eliminates offset errors.
- **Low Noise:** Ensures stable and accurate readings.
- **BCD Output:** Simplifies interfacing with microcontrollers or displays.
- **Overrange and Underrange Indication:** Flags readings outside the ±2V range.
- **Single-Supply Operation:** Simplifies power requirements.
This information is based solely on the manufacturer's datasheet and technical documentation.
