Overview
The AD585SQ, produced by Analog Devices Inc., is a high-speed, precision sample-and-hold amplifier designed for high-performance data acquisition systems. This monolithic sample-and-hold circuit integrates a high-performance operational amplifier, an ultralow leakage analog switch, and a FET input integrating amplifier. It is particularly suited for 10- and 12-bit data acquisition systems where fast acquisition time, low sample-to-hold offset, and low droop are critical.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Acquisition Time (10 V Step to 0.01%) | 3 | 3 | 3 | µs |
| Acquisition Time (20 V Step to 0.01%) | 5 | 5 | 5 | µs |
| Aperture Time (20 V p-p Input, HOLD 0 V) | 35 | 35 | 35 | ns |
| Aperture Jitter (20 V p-p Input, HOLD 0 V) | 0.5 | 0.5 | 0.5 | ns |
| Sample-to-Hold Offset | 3 | mV | ||
| Droop Rate | 1.0 | mV/ms | ||
| Input Resistance (Sample or Hold) | 10^12 | 10^12 | 10^12 | Ω |
| Supply Voltage Range | ±5 V to ±18 V | V | ||
| Operating Temperature Range | -55°C | +125°C | °C | |
| Package Type | 14-pin CERDIP |
Key Features
- Fast Acquisition Time: The AD585SQ can acquire a signal to ±0.01% in 3 µs maximum for a 10 V step and 5 µs for a 20 V step.
- Low Aperture Jitter: The high-speed analog switch exhibits an aperture jitter of 0.5 ns, enabling the device to sample full-scale signals at frequencies up to 78 kHz.
- Low Droop Rate: The device has a droop rate of less than 1 mV/ms, making it suitable for both high-speed and high-accuracy applications.
- Internal Hold Capacitor and Application Resistors: The AD585SQ includes an internal 100 pF hold capacitor and pretrimmed application resistors for high precision and flexibility.
- MIL-STD-883 Compliance: Versions of the AD585SQ are available that comply with MIL-STD-883, suitable for military and high-reliability applications.
- Versatile Logic Interfacing: The control signals for the HOLD command are compatible with CMOS, TTL, and ECL logic systems.
Applications
- Data Acquisition Systems: Ideal for high-speed 10- and 12-bit data acquisition systems, enabling accurate digitization of high-frequency signals and high throughput rates.
- Data Distribution Systems: Suitable for systems requiring precise signal sampling and holding.
- Analog Delay & Storage: Can be used for applications needing temporary storage of analog signals.
- Peak Amplitude Measurements: Useful in systems that require precise measurement of signal peaks).
Q & A
- What is the acquisition time of the AD585SQ for a 10 V step?
The AD585SQ can acquire a signal to ±0.01% in 3 µs maximum for a 10 V step).
- What is the aperture jitter of the AD585SQ?
The high-speed analog switch exhibits an aperture jitter of 0.5 ns).
- What is the droop rate of the AD585SQ?
The device has a droop rate of less than 1 mV/ms).
- Does the AD585SQ have an internal hold capacitor?
Yes, the AD585SQ includes an internal 100 pF hold capacitor).
- What are the operating temperature ranges for the AD585SQ?
The AD585SQ operates within the temperature range of -55°C to +125°C).
- Is the AD585SQ compliant with MIL-STD-883?
Yes, versions of the AD585SQ are available that comply with MIL-STD-883).
- What types of logic systems is the AD585SQ compatible with?
The AD585SQ is compatible with CMOS, TTL, and ECL logic systems).
- What is the typical supply current of the AD585SQ?
The typical supply current of the AD585SQ is 6 to 10 mA).
- Can the AD585SQ be used with external hold capacitors?
Yes, an external hold capacitor can be added to reduce the droop rate when long hold times and high accuracy are required).
- What are some recommended A/D converters for use with the AD585SQ?
The AD585SQ is recommended for use with 10- and 12-bit successive-approximation A/D converters such as AD573, AD574A, AD674A, AD7572, and AD7672).
