Overview
The AD7874SQ is a high-performance, four-channel simultaneous sampling, 12-bit data acquisition system produced by Analog Devices Inc. This integrated circuit features a high-speed 12-bit Analog-to-Digital Converter (ADC), an on-chip reference, an on-chip clock, and four track/hold amplifiers. This configuration allows for the simultaneous sampling of four input channels, preserving the relative phase information between the channels, which is crucial in applications requiring precise timing and phase accuracy.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Channels | 4 |
| Resolution | 12-bit |
| Conversion Rate | 116 kSPS |
| Input Type | Simultaneous Sampling |
| Reference | On-chip reference |
| Clock | On-chip clock |
| Track/Hold Amplifiers | 4 |
| Package Types | 28-pin CDIP, 28-pin PDIP, 28-pin SOIC (Wide) |
| Supply Voltage | 5V |
| Operating Temperature | Varies by package (e.g., -55°C to +125°C for military grades) |
Key Features
- Simultaneous sampling of four input channels using four track/hold amplifiers, ensuring phase accuracy between channels.
- High-speed 12-bit ADC with on-chip reference and on-chip clock.
- Small aperture delay of the track/hold amplifiers, allowing multiple AD7874s to sample multiple input channels simultaneously without phase errors.
- Reference output/reference input facility for driving multiple AD7874s from the same reference source.
- Fabricated in Analog Devices' Linear Compatible CMOS (LC2MOS) process, combining precision bipolar circuits with low-power CMOS logic.
Applications
The AD7874SQ is ideal for various applications where simultaneous sampling and phase accuracy are critical. These include:
- Phased-array sonar systems.
- AC motor controllers.
- Industrial control systems requiring precise data acquisition.
- Medical imaging and diagnostic equipment.
- Aerospace and defense systems.
Q & A
- What is the resolution of the AD7874SQ ADC?
The AD7874SQ has a 12-bit resolution. - How many channels does the AD7874SQ support?
The AD7874SQ supports four simultaneous sampling channels. - What is the conversion rate of the AD7874SQ?
The conversion rate is 116 kSPS. - Does the AD7874SQ have an on-chip reference and clock?
Yes, it has both an on-chip reference and an on-chip clock. - What are the package options for the AD7874SQ?
The AD7874SQ is available in 28-pin CDIP, 28-pin PDIP, and 28-pin SOIC (Wide) packages. - What is the supply voltage for the AD7874SQ?
The supply voltage is 5V. - What are some typical applications of the AD7874SQ?
Typical applications include phased-array sonar, AC motor controllers, industrial control systems, medical imaging, and aerospace and defense systems. - How does the AD7874SQ ensure phase accuracy between channels?
The AD7874SQ ensures phase accuracy by using four track/hold amplifiers for simultaneous sampling of the four input channels. - Can multiple AD7874SQs be driven from the same reference source?
Yes, the AD7874SQ has a reference output/reference input facility that allows multiple devices to be driven from the same reference source. - What process is the AD7874SQ fabricated in?
The AD7874SQ is fabricated in Analog Devices' Linear Compatible CMOS (LC2MOS) process.
