4 Digit A/D Converter with Multiplexed BCD Outputs The ICL7135CJI is a 4½-digit analog-to-digital converter (ADC) manufactured by Harris Semiconductor (now part of Intersil). Below are its key specifications, descriptions, and features:
### **Specifications:**
1. **Resolution:** 4½ digits (equivalent to ±20,000 counts).
2. **Input Voltage Range:** ±2V (full-scale).
3. **Accuracy:** ±1 count (typical).
4. **Conversion Rate:** Up to 25 conversions per second.
5. **Power Supply:** Single +5V supply (typical).
6. **Reference Voltage:** Requires an external reference (typically 1V).
7. **Input Impedance:** >1 GΩ (high input impedance).
8. **Operating Temperature Range:** 0°C to +70°C (commercial grade).
9. **Package:** 28-pin CerDIP (Ceramic Dual In-line Package).
### **Descriptions:**
- The ICL7135CJI is a precision ADC designed for digital panel meters, data acquisition systems, and instrumentation.
- It uses a dual-slope integrating conversion technique for high accuracy and noise rejection.
- The device includes auto-zeroing and polarity detection for ease of use.
- It provides multiplexed BCD outputs and requires minimal external components for operation.
### **Features:**
- **True Differential Input:** Allows measurement of signals referenced to ground or floating.
- **Auto-Zero Cycle:** Ensures high accuracy by eliminating offset errors.
- **Low Power Consumption:** Suitable for battery-powered applications.
- **Overrange and Underrange Indication:** Helps detect out-of-range inputs.
- **Direct Drive for LCD or LED Displays:** Compatible with common display drivers.
- **Low Noise:** Excellent noise rejection for stable readings.
This information is based solely on the manufacturer's datasheet for the ICL7135CJI.
