LMX3162VBHX

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The LMX3162VBHX is a programmable synthesizer from the renowned Texas Instruments, which is commonly used for wireless communication applications like wireless local area networks. It is a single-channel fractional-N frequency synthesizer with integrated PA (power amplifier) and transmit modulator. It is a highly integrated device that is designed to meet the most stringent requirements for medium-range and long-range radio link applications. This article will discuss the application field and working principle of the LMX3162VBHX.

Application Field

The LMX3162VBHX is a high-performance digital synthesizer that can be used in a variety of applications such as short-range wireless links, high-speed mobile communications, mobile infrastructure networks, satellite systems, and personal communications networks. It can be used in high-speed data-link applications with downlink rates of up to 10 Mbps. Furthermore, it can be used for frequency-hopping spread spectrum transmission, which is used for higher-speed transmission of data in extremely noisy environments. It can also be employed for wide-area telecommunications networks.

Working Principle

The LMX3162VBHX is a CMOS integrated circuit with an on-chip LC VCO (voltage-controlled oscillator). This device uses an integrated frequency divider circuit to produce a precise output frequency. The frequency divider circuit consists of an adjustable reference frequency divider fd and a programmable output frequency divider n. It also has a delay-locked-loop (DLL) circuit to synchronize the frequency dividers with an external reference clock. The frequency dividers produce an output frequency equal to the reference clock frequency divided by the ratio of the two dividers. The output frequency can be programmed via control signals, and it is further controlled by multiplexers and comparators. The programmable output frequency divider can be used to modify the output frequency in small steps. Also, the device is configured by programming the settings through a 3-wire serial interface.

The LMX3162VBHX also includes a built-in off-chip resonance sensor consisting of two terminals that are used to measure, detect and adjust the CA (current amplification) of the output frequency. The resonance sensor can be used to ensure that the output frequency remains within the prescribed range. Furthermore, the device has an integrated 2.0 V high-efficiency PA with a power-saving capability. The associated filter and matching circuit reduce the loss and also improve the data rate performance.

Conclusion

The LMX3162VBHX is a single-channel fractional-N frequency synthesizer with integrated PA and transmit modulator. It has been designed to meet stringent requirements in medium and long-range radio link applications. It has multiple features such as an adjustable reference frequency divider, a programmable output frequency divider, a DLL circuit, an off-chip resonance sensor, and an integrated 2.0 V high-efficiency PA with a power-saving capability. The LMX3162VBHX is an excellent choice for short and long range communication applications.

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