Overview
The AD9281ARS is a dual-channel, 8-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This component is designed for applications requiring close matching between two ADCs, such as I/Q channels in communications systems. It features a high sampling rate of 28 MSPS and integrates two input buffer amplifiers, an internal voltage reference, and multiplexed digital output buffers. The AD9281ARS operates on a single supply voltage ranging from 2.7 V to 5.5 V and is packaged in a compact 28-lead SSOP package.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Units | Condition |
|---|---|---|---|---|---|---|
| Resolution | - | 8 | - | - | Bits | - |
| Conversion Rate | FS | 28 | - | 32 (at +25°C) | MHz | AVDD = +3 V, DVDD = +3 V, FSAMPLE = 28 MSPS, VREF = 2 V, INB = 0.5 V, TMIN to TMAX unless otherwise noted |
| Supply Voltage | AVDD/DVDD | 2.7 | - | 5.5 | V | - |
| Power Consumption | - | - | 225 | - | mW | On 3 V supply |
| Operating Temperature | - | -40 | - | 85 | °C | - |
| Input Structure | - | - | - | - | Single-ended or differential | - |
Key Features
- Dual 8-bit, 28 MSPS ADCs optimized for spurious free dynamic performance, ideal for I/Q channels or diversity channel information.
- Low power consumption of 225 mW on a single 3 V supply, with supply voltage range from 2.7 V to 5.5 V.
- On-chip voltage reference programmable for 1 V or 2 V.
- On-chip analog input buffers eliminate the need for external op amps in most applications.
- Single 8-bit digital output bus, saving board space and digital pin count.
- Compact 28-lead SSOP package.
- Pin compatible with the dual 10-bit ADC (AD9201).
Applications
The AD9281ARS is particularly suited for applications requiring high-speed, dual-channel analog-to-digital conversion with close matching between the channels. Key applications include:
- Communications systems, especially for I/Q channels in radio frequency (RF) and microwave systems.
- Diversity channel information in wireless communication systems.
- High-speed data acquisition systems requiring simultaneous sampling of multiple channels.
- Medical imaging and diagnostic equipment where high-speed ADCs are necessary.
Q & A
- What is the resolution of the AD9281ARS ADC?
The AD9281ARS has a resolution of 8 bits. - What is the maximum sampling rate of the AD9281ARS?
The maximum sampling rate is 28 MSPS, with up to 32 MSPS at +25°C. - What is the supply voltage range for the AD9281ARS?
The supply voltage range is from 2.7 V to 5.5 V. - How much power does the AD9281ARS consume on a 3 V supply?
The power consumption is 225 mW on a 3 V supply. - What type of input structure does the AD9281ARS support?
The AD9281ARS supports both single-ended and differential input signals. - Does the AD9281ARS require external op amps for the analog inputs?
No, the AD9281ARS has on-chip analog input buffers that eliminate the need for external op amps in most applications. - What is the package type of the AD9281ARS?
The AD9281ARS is packaged in a 28-lead SSOP package. - Is the AD9281ARS pin compatible with other ADC models?
Yes, it is pin compatible with the dual 10-bit ADC (AD9201). - What are some common applications of the AD9281ARS?
Common applications include communications systems, diversity channel information in wireless communication systems, and high-speed data acquisition systems. - What is the operating temperature range of the AD9281ARS?
The operating temperature range is from -40°C to +85°C.
