Overview
The AD9874ABST, produced by Analog Devices Inc., is a general-purpose Intermediate Frequency (IF) subsystem designed to digitize low-level IF input signals within the frequency range of 10 MHz to 300 MHz. This component is particularly useful in various wireless communication systems, including UHF, cellular, TETRA, GSM, EDGE, and APCO25. The AD9874ABST integrates a comprehensive signal chain consisting of a low noise amplifier, a mixer, a band-pass sigma-delta analog-to-digital converter, and a decimation filter with a programmable decimation factor. Additionally, it features an automatic gain control (AGC) circuit and both clock and LO synthesizers, enhancing its dynamic range and antialiasing capabilities.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Frequency Range | 10 MHz | - | 300 MHz | - |
| Signal Bandwidth | 6.8 kHz | - | 270 kHz | - |
| Supply Voltage | 2.7 V | 3.0 V | 3.6 V | V |
| Package Type | - | - | 48-Lead Thin Plastic Quad Flatpack (LQFP) | - |
| Decimation Factor | 48 | - | 960 | - |
| Alias Attenuation | - | - | 88 dB | - |
| Dynamic Range | - | - | Up to 95 dB | - |
| AGC Gain Adjustment | - | - | 12 dB continuous | - |
| Nominal Supply Current | - | 26.5 mA | - | mA |
| Power Dissipation | - | 79.5 mW | - | mW |
Key Features
- Integrated signal chain including a low noise amplifier, mixer, band-pass sigma-delta analog-to-digital converter, and decimation filter with programmable decimation factor.
- Automatic gain control (AGC) circuit providing 12 dB of continuous gain adjustment.
- Clock and LO synthesizers for flexible clocking and local oscillator generation.
- High dynamic range and inherent antialiasing, allowing the component to handle blocking signals up to 95 dB stronger than the desired signal.
- SPI port for programming numerous parameters.
- Operating temperature range from -40°C to +85°C.
Applications
The AD9874ABST is suitable for a variety of wireless communication systems, including:
- UHF and cellular networks.
- TETRA (Terrestrial Trunked Radio) systems.
- GSM (Global System for Mobile Communications) and EDGE (Enhanced Data Rates for GSM Evolution) networks.
- APCO25 (Association of Public-Safety Communications Officials-Project 25) systems.
- Multimode radios with varying channel bandwidths.
Q & A
- What is the operating frequency range of the AD9874ABST?
The AD9874ABST operates within the frequency range of 10 MHz to 300 MHz. - What is the signal bandwidth supported by the AD9874ABST?
The signal bandwidth ranges from 6.8 kHz to 270 kHz. - What type of package does the AD9874ABST come in?
The AD9874ABST comes in a 48-Lead Thin Plastic Quad Flatpack (LQFP) package. - What is the dynamic range of the AD9874ABST?
The AD9874ABST has a dynamic range of up to 95 dB. - Does the AD9874ABST have automatic gain control?
Yes, the AD9874ABST features an automatic gain control (AGC) circuit with 12 dB of continuous gain adjustment. - What is the nominal supply current of the AD9874ABST?
The nominal supply current is 26.5 mA. - What is the power dissipation of the AD9874ABST?
The power dissipation is approximately 79.5 mW. - What communication systems is the AD9874ABST suitable for?
The AD9874ABST is suitable for UHF, cellular, TETRA, GSM, EDGE, and APCO25 systems. - How does the AD9874ABST handle blocking signals?
The AD9874ABST can handle blocking signals up to 95 dB stronger than the desired signal due to its high dynamic range and inherent antialiasing. - What interface does the AD9874ABST use for programming?
The AD9874ABST uses an SPI port for programming various parameters.
