Overview
The AD652AQ, manufactured by Analog Devices Inc., is a synchronous voltage-to-frequency converter (SVFC) designed for precision analog-to-digital conversion. This component is a powerful building block for various applications requiring high accuracy and stability in frequency conversion. The AD652AQ operates with a full-scale frequency up to 2 MHz, set by an external system clock, and features extremely low linearity error and minimal gain drift, making it suitable for both single- and multichannel systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Gain Error (fCLOCK = 200 kHz) | ±0.5% | ±1% | ±0.25% | % |
| Gain Error (fCLOCK = 1 MHz) | ±0.5% | ±1% | ±0.25% | % |
| Gain Error (fCLOCK = 4 MHz) | ±0.5% | ±1.5% | ±0.25% | % |
| Gain Temperature Coefficient (fCLOCK = 200 kHz) | ±25 | ±50 | ±15 | µV/°C |
| Open-Loop Gain | 86 | 86 | dB | |
| Common-Mode Input Range | –VS + 5 | +VS – 5 | V | |
| CMRR | 80 | 80 | dB | |
| Bandwidth | 14 | 95 | MHz | |
| Output Voltage Range | −1 (+VS − 4) | V (Referred to Pin 6, R1 >= 5 kΩ) | ||
| Comparator Input Bias Current | 0.5 | 5 | µA | |
| Clock Input Maximum Frequency | 4 | 5 | MHz | |
| Clock Input Threshold Voltage (Referred to Pin 12) | 1.2 | V | ||
| Package | 16-CDIP (0.300", 7.62mm) | |||
| Operating Temperature Range | −40°C | +85°C | °C |
Key Features
- High Accuracy and Linearity: The AD652AQ features extremely low linearity error (0.005% max at 1 MHz FS, 0.02% max at 2 MHz FS) and minimal gain drift, ensuring high accuracy in frequency conversion.
- External Clock Setting: The full-scale frequency is set by an external system clock, allowing for superior linearity and stability compared to other monolithic VFCs.
- No Critical External Components: The AD652AQ requires only one noncritical external component (an integrator capacitor) for operation, simplifying the design process.
- Accurate 5 V Reference Voltage: The component includes a buffered, accurate 5 V reference voltage, which is essential for maintaining precision in the conversion process.
- Dual- or Single-Supply Operation: The AD652AQ can operate from either a dual or single power supply, making it versatile for various application scenarios.
- Low Drift and High Stability: The component features low drift (25 ppm/°C max) and high stability, ensuring reliable performance over a wide temperature range).
Applications
- Precision Analog-to-Digital Conversion: The AD652AQ is ideal for applications requiring high accuracy and stability in analog-to-digital conversion, such as in data acquisition systems and precision measurement instruments.
- Single- and Multichannel Systems: The component is suitable for both single- and multichannel systems, making it versatile for a range of applications).
- Industrial and Commercial Environments: With its operating temperature range of −40°C to +85°C, the AD652AQ is suitable for use in both industrial and commercial environments).
- MIL-STD-883 Compliant Versions: Available versions compliant with MIL-STD-883 make the AD652AQ suitable for military and aerospace applications).
Q & A
- What is the primary function of the AD652AQ?
The AD652AQ is a synchronous voltage-to-frequency converter (SVFC) designed for precision analog-to-digital conversion).
- What is the maximum full-scale frequency of the AD652AQ?
The maximum full-scale frequency of the AD652AQ is up to 2 MHz, set by an external system clock).
- What is the typical linearity error of the AD652AQ?
The typical linearity error of the AD652AQ is 0.005% at 1 MHz FS and 0.02% at 2 MHz FS).
- Does the AD652AQ require any critical external components?
No, the AD652AQ requires only one noncritical external component (an integrator capacitor) for operation).
- What is the operating temperature range of the AD652AQ?
The operating temperature range of the AD652AQ is −40°C to +85°C).
- Can the AD652AQ operate with a single power supply?
Yes, the AD652AQ can operate from either a dual or single power supply).
- What is the package type of the AD652AQ?
The AD652AQ is packaged in a 16-CDIP (0.300", 7.62mm) package).
- Is the AD652AQ compliant with MIL-STD-883?
Yes, MIL-STD-883 compliant versions of the AD652AQ are available).
- What is the common-mode input range of the AD652AQ?
The common-mode input range of the AD652AQ is –VS + 5 to +VS – 5 V).
- What is the maximum clock input frequency of the AD652AQ?
The maximum clock input frequency of the AD652AQ is 5 MHz).
