Overview
The AD9874BST, produced by Analog Devices Inc., is a general-purpose Intermediate Frequency (IF) subsystem designed to digitize low-level IF input signals. This component is part of Analog Devices' extensive range of analog and mixed-signal integrated circuits. The AD9874BST is engineered to handle IF input signals within the frequency range of 10 MHz to 300 MHz, with a signal bandwidth that can vary from 6.8 kHz to 270 kHz. It integrates several key components, including a low noise amplifier, a mixer, a band-pass sigma-delta analog-to-digital converter, and a decimation filter with a programmable decimation factor. This integration makes the AD9874BST a versatile and efficient solution for various communication and signal processing applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| IF Input Frequency | 10 MHz | - | 300 MHz | - |
| Signal Bandwidth | 6.8 kHz | - | 270 kHz | - |
| Decimation Factor | 48 | - | 960 | - |
| Pass-Band Width | - | 50% fCLK | - | - |
| Pass-Band Gain Variation | - | 1.2 dB | - | - |
| Alias Attenuation | - | 88 dB | - | - |
| AGC Gain Adjustment | - | 12 dB continuous | - | - |
| Supply Voltage (VDDI, VDDF, VDDA, VDDC, VDDL, VDDD, VDDH) | 2.7 V | - | 3.6 V | - |
| Supply Voltage (VDDQ, VDDP) | 2.7 V | - | 5.5 V | - |
Key Features
- Integrated Signal Chain: Includes a low noise amplifier, mixer, band-pass sigma-delta analog-to-digital converter, and a decimation filter with programmable decimation factor.
- Automatic Gain Control (AGC): Provides 12 dB of continuous gain adjustment.
- High Dynamic Range: Capable of handling blocking signals up to 95 dB stronger than the desired signal, reducing the need for extensive IF filtering.
- Programmable Parameters: Various parameters can be programmed via an SPI port.
- Clock and LO Synthesizers: Integrated clock and local oscillator synthesizers for flexible operation.
Applications
The AD9874BST is suitable for a variety of applications, including:
- Communication Systems: Ideal for multimode radios and communication systems requiring flexible IF processing.
- RF Receivers: Used in RF receiver designs to digitize IF signals efficiently.
- Signal Processing: Applicable in various signal processing tasks where high dynamic range and programmable decimation are necessary.
- Wireless Systems: Can be integrated into wireless systems to enhance signal quality and reduce hardware complexity.
Q & A
- What is the frequency range of the IF input signal for the AD9874BST?
The AD9874BST can handle IF input signals within the frequency range of 10 MHz to 300 MHz. - What is the signal bandwidth range of the AD9874BST?
The signal bandwidth can range from 6.8 kHz to 270 kHz. - What components are integrated into the AD9874BST signal chain?
The signal chain includes a low noise amplifier, a mixer, a band-pass sigma-delta analog-to-digital converter, and a decimation filter. - Does the AD9874BST have automatic gain control?
Yes, it includes an automatic gain control (AGC) circuit that provides 12 dB of continuous gain adjustment. - How can the parameters of the AD9874BST be programmed?
Parameters can be programmed via an SPI port. - What is the dynamic range capability of the AD9874BST?
The AD9874BST can handle blocking signals up to 95 dB stronger than the desired signal. - What are the supply voltage ranges for the AD9874BST?
The supply voltage ranges are 2.7 V to 3.6 V for VDDI, VDDF, VDDA, VDDC, VDDL, VDDD, and VDDH, and 2.7 V to 5.5 V for VDDQ and VDDP. - What types of applications is the AD9874BST suitable for?
The AD9874BST is suitable for communication systems, RF receivers, signal processing, and wireless systems. - How does the AD9874BST reduce hardware complexity in radio designs?
The high dynamic range and inherent antialiasing provided by the band-pass sigma-delta converter reduce the need for extensive IF filtering, thus simplifying radio designs. - What is the significance of the decimation filter in the AD9874BST?
The decimation filter has a programmable decimation factor, allowing for flexible signal processing and bandwidth adjustment.
