Overview
The AD6620AS, produced by Analog Devices Inc., is a 67 MSPS Digital Receive Signal Processor designed to bridge the gap between high-speed Analog-to-Digital Converters (ADCs) and general-purpose Digital Signal Processors (DSPs). This component is part of Analog Devices' innovative Diversity Receiver chipset, which delivers two IF-to-baseband diversity channels in a compact and comprehensive solution. The AD6620AS incorporates advanced digital signal processing elements, including a frequency translator, two fixed-coefficient decimating filters, and a programmable coefficient decimating filter, making it highly versatile for various wireless communication applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD | 3.0 | 3.3 | 3.6 | V |
| TAMBIENT | -40 | +25 | +85 | °C |
| Input Sample Rate | 67 MSPS (Single Channel Real) | MSPS | ||
| Input Sample Rate (Diversity Channel) | 33.5 MSPS (Real) | MSPS | ||
| NCO Frequency Translation | Worst Spur Better than –100 dBc | dBc | ||
| NCO Tuning Resolution | Better than 0.02 Hz | Hz | ||
| Decimation Rates (2nd Order CIC FIR Filter) | 2 | 16 | ||
| Decimation Rates (5th Order CIC FIR Filter) | 1 | 32 | ||
| Programmable Decimating RAM Coefficient FIR Filter | Up to 134 Million Taps per Second | Taps/s | ||
| Programmable Coefficients | 256 20-Bit Coefficients | |||
| Supply Current (CLK = 20 MHz) | 52 mA | mA |
Key Features
- Advanced Signal Processing: The AD6620AS includes a frequency translator, two fixed-coefficient decimating filters, and a programmable coefficient decimating filter, enabling high-resolution digital IF processing.
- High Input Sample Rates: Supports up to 67 MSPS for single-channel real inputs and 33.5 MSPS for diversity channel real inputs.
- NCO Frequency Translation: Offers a worst spur better than –100 dBc and tuning resolution better than 0.02 Hz.
- Programmable Decimation Rates: Supports decimation rates from 2 to 16 for the 2nd order CIC FIR filter and from 1 to 32 for the 5th order CIC FIR filter.
- Programmable Decimating RAM Coefficient FIR Filter: Capable of up to 134 million taps per second with 256 20-bit programmable coefficients.
- Automatic Gain Control and Received Signal Strength Indicator: Integrated features for robust signal management.
- Compatibility: Inputs are 3.3 V LVCMOS compatible, and outputs are LVCMOS and 5 V TTL compatible.
Applications
- Wireless Communication Systems: Suitable for various air interface standards including GSM, CDMA, IS136, and PHS, as well as proprietary modulation schemes for paging systems and wireless fixed access receivers.
- Diversity Receivers: Part of a comprehensive solution that delivers two IF-to-baseband diversity channels, enhancing signal reception and reliability.
- General-Purpose DSP Systems: Bridges the gap between high-speed ADCs and general-purpose DSPs, making it versatile for a wide range of digital signal processing applications.
Q & A
- What is the maximum input sample rate of the AD6620AS?
The AD6620AS supports up to 67 MSPS for single-channel real inputs and 33.5 MSPS for diversity channel real inputs.
- What types of filters are included in the AD6620AS?
The AD6620AS includes two fixed-coefficient decimating filters and a programmable coefficient decimating filter.
- What is the tuning resolution of the NCO in the AD6620AS?
The NCO tuning resolution is better than 0.02 Hz.
- What are the decimation rates supported by the AD6620AS?
The decimation rates range from 2 to 16 for the 2nd order CIC FIR filter and from 1 to 32 for the 5th order CIC FIR filter).
- Is the AD6620AS compatible with 5 V TTL logic?
Yes, the outputs of the AD6620AS are LVCMOS and 5 V TTL compatible).
- What is the supply current of the AD6620AS at a clock frequency of 20 MHz?
The supply current is approximately 52 mA at a clock frequency of 20 MHz).
- What are the typical operating temperature ranges for the AD6620AS?
The operating temperature range is from -40°C to +85°C).
- Does the AD6620AS support automatic gain control and received signal strength indicator?
Yes, the AD6620AS includes automatic gain control and received signal strength indicator features).
- What package options are available for the AD6620AS?
The AD6620AS is available in an 80-Lead MQFP (14mm x 14mm) package).
- What are some common applications of the AD6620AS?
The AD6620AS is commonly used in wireless communication systems, diversity receivers, and general-purpose DSP systems).
