Overview
The MAX2172ETL+TW is a direct-conversion to low-IF tuner designed by Analog Devices Inc./Maxim Integrated for digital audio broadcast (DAB) and terrestrial digital multimedia broadcast (T-DMB) applications. This component covers a wide input frequency range, including 168MHz to 240MHz (VHF-III), 1452MHz to 1492MHz (L-band), and 87MHz to 108MHz (FM). The MAX2172 achieves high component integration, enabling low-power, tuner-on-board designs. The direct-conversion to low-IF architecture eliminates the need for an IF-SAW filter, providing a balanced 2.048MHz center frequency baseband output to the demodulator. It also includes a buffered reference clock at the crystal frequency and a sigma-delta fractional-N synthesizer to optimize phase noise performance for OFDM applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 40-pin TQFN (6mm x 6mm) |
| Supply Voltage Range | 2.7V to 3.5V |
| Operating Temperature Range | -40°C to 85°C |
| Input Frequency Range | 168MHz to 240MHz (VHF-III), 1452MHz to 1492MHz (L-band), 87MHz to 108MHz (FM) |
| Typical Noise Figure (VHF-III) | 2.9dB |
| Typical Noise Figure (L-Band) | 3.1dB |
| VHF-III Sensitivity | -101dBm |
| L-Band Sensitivity | -101dBm |
| ACPR (N±1) | +45dBc |
| FM (S+N)/N | 26dB at -111dBm |
Key Features
- High component integration allowing low-power, tuner-on-board designs
- Direct-conversion to low-IF architecture eliminating the need for an IF-SAW filter
- Buffered reference clock at the crystal frequency
- Sigma-delta fractional-N synthesizer for optimized phase noise performance
- Baseband overload detector controls RF AGC
- Fast channel scan RSSI 5-Bit Output
Applications
The MAX2172ETL+TW is primarily used in digital audio broadcast (DAB) and terrestrial digital multimedia broadcast (T-DMB) applications. It is also suitable for other communications and networking applications due to its robust performance characteristics.
Q & A
- What is the primary application of the MAX2172ETL+TW?
The MAX2172ETL+TW is designed for digital audio broadcast (DAB) and terrestrial digital multimedia broadcast (T-DMB) applications. - What is the input frequency range of the MAX2172ETL+TW?
The input frequency range includes 168MHz to 240MHz (VHF-III), 1452MHz to 1492MHz (L-band), and 87MHz to 108MHz (FM). - What is the supply voltage range of the MAX2172ETL+TW?
The supply voltage range is 2.7V to 3.5V. - What is the operating temperature range of the MAX2172ETL+TW?
The operating temperature range is -40°C to 85°C. - What type of synthesizer is used in the MAX2172ETL+TW?
A sigma-delta fractional-N synthesizer is used to optimize phase noise performance. - What is the typical noise figure for VHF-III and L-Band?
The typical noise figure for VHF-III is 2.9dB, and for L-Band, it is 3.1dB. - What is the sensitivity of the MAX2172ETL+TW for VHF-III and L-Band?
The sensitivity for both VHF-III and L-Band is -101dBm. - Does the MAX2172ETL+TW require an IF-SAW filter?
No, the direct-conversion to low-IF architecture eliminates the need for an IF-SAW filter. - What is the ACPR (N±1) of the MAX2172ETL+TW?
The ACPR (N±1) is +45dBc. - What is the FM (S+N)/N performance of the MAX2172ETL+TW?
The FM (S+N)/N performance is 26dB at -111dBm.
