Overview
The AD652SQ, produced by Analog Devices Inc., is a monolithic synchronous voltage-to-frequency converter (SVFC) designed for high-precision analog-to-digital conversion. This device is particularly useful in applications requiring accurate and stable frequency output from a voltage input. The AD652SQ operates over an extended temperature range of −55°C to +125°C, making it suitable for a wide range of environments. It utilizes a charge-balancing technique and an external clock to define the full-scale output frequency, ensuring high linearity and stability. The device includes a buffered, accurate 5 V reference voltage and is compatible with both TTL and CMOS clock inputs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Voltage-to-Frequency Mode Gain Error (fCLOCK = 200 kHz) | ±0.5% | ±1% | ±0.25% | % |
| Voltage-to-Frequency Mode Gain Error (fCLOCK = 1 MHz) | ±0.5% | ±1% | ±0.25% | % |
| Voltage-to-Frequency Mode Gain Error (fCLOCK = 4 MHz) | ±0.5% | ±1.5% | ±0.25% | % |
| Gain Temperature Coefficient (fCLOCK = 200 kHz) | ±25 ppm/°C | ±50 ppm/°C | ±15 ppm/°C | ppm/°C |
| Maximum Output Frequency | 2 MHz | Hz | ||
| Linearity | ±0.02% | % | ||
| Temperature Range | −55°C | +125°C | °C | |
| Package Type | 16-CERDIP |
Key Features
- High Precision Conversion: The AD652SQ offers exceptional linearity of ±0.02% and a maximum output frequency of 2 MHz, making it suitable for high-precision applications.
- External Clock Input: The device uses an external clock to set the full-scale frequency, ensuring stability and linearity independent of variations in clock frequency.
- Low Drift Reference Voltage: The AD652SQ includes a buffered, accurate 5 V reference voltage with low drift (25 ppm/°C max), minimizing gain drift.
- Dual- or Single-Supply Operation: The device can operate from either dual or single power supplies, enhancing its versatility in different system designs.
- Minimal External Components: The AD652SQ requires only one noncritical external component (an integrator capacitor) for operation, simplifying the circuit design.
- TTL and CMOS Compatibility: The clock input is compatible with both TTL and CMOS logic levels, facilitating integration with various digital systems.
Applications
- Industrial Control Systems: The AD652SQ is used in industrial control systems where precise voltage-to-frequency conversion is critical.
- Precision Instrumentation: Its high precision and stability make it ideal for precision instrumentation applications.
- Automatic Testing Equipment: The device is suitable for automatic testing equipment due to its high accuracy and reliability.
- Data Acquisition Systems: It is also used in data acquisition systems where accurate and stable frequency outputs are necessary.
Q & A
- What is the maximum output frequency of the AD652SQ?
The maximum output frequency of the AD652SQ is 2 MHz.
- What is the linearity of the AD652SQ?
The linearity of the AD652SQ is ±0.02%.
- What is the temperature range of the AD652SQ?
The AD652SQ operates over a temperature range of −55°C to +125°C.
- Does the AD652SQ require any critical external components?
No, the AD652SQ requires only one noncritical external component, an integrator capacitor.
- Is the AD652SQ compatible with both TTL and CMOS logic levels?
- What type of package does the AD652SQ come in?
The AD652SQ comes in a 16-CERDIP package.
- What is the gain temperature coefficient of the AD652SQ?
The gain temperature coefficient of the AD652SQ is ±25 ppm/°C.
- Can the AD652SQ operate from a single power supply?
- What are some common applications of the AD652SQ?
The AD652SQ is commonly used in industrial control systems, precision instrumentation, automatic testing equipment, and data acquisition systems.
- Does the AD652SQ include a reference voltage?
