LMX2531LQ1742/NOPB - High-Performance RF Synthesizer | TI
料号： LMX2531LQ1742/NOPB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8.1 | $8,100.00 |
LMX2531LQ1742/NOPB 概述
A frequency synthesizer is a key building block in RF and wireless systems, generating precise local oscillator signals for upconversion and downconversion. The LMX2531 integrates the PLL, VCO, and loop filter components, reducing external component count and board space. This integration simplifies design and improves reliability, as the critical RF path is contained within a single device.
Key features include ultra-low noise and high-precision LDOs integrated for the PLL and VCO, which yield higher supply-noise immunity and more consistent performance. The device supports a wide supply voltage range and includes a programmable charge pump, phase frequency detector, and fractional-N or integer-N operation. The integrated VCO covers the specified frequency band with excellent phase noise performance, essential for communication systems.
The LMX2531 uses a delta-sigma fractional-N architecture, allowing fine frequency resolution while maintaining low phase noise. The integrated LDOs isolate the sensitive analog circuits from supply noise, improving overall system performance. The device operates over the industrial temperature range of -40°C to +85°C, ensuring reliability in demanding environments.
Typical applications include wireless infrastructure, base stations, point-to-point radios, satellite communications, and test and measurement equipment. The wide frequency range and low phase noise make it ideal for local oscillator generation in transceivers and frequency hopping systems.
When designing with the LMX2531, careful attention must be paid to power supply decoupling and PCB layout to minimize noise coupling. The exposed pad should be soldered to a ground plane for thermal and electrical performance. The device requires an external loop filter, which should be designed according to the application's phase noise and lock time requirements.
直接替换替代料： LMX2531LQ1742/NOPB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
LMX2531LQX1742/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LMX2531LQ1742E/NOPB
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LMX2531LQ1700E/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LMX2531LQ1575E/NOPB
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LMX2531LQ2080E/NOPB
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LMX2531LQ1742/NOPB 规格参数
| Type | Frequency Synthesizer (RF) |
| PLL | Yes |
| Input | Clock |
| Output | CMOS |
| Frequency - Max | 1.866 GHz |
| Number of Circuits | 1 |
| 封装 / 外壳 | 36-WFQFN Exposed Pad |
| Supplier Device Package | 36-WQFN (NJG) |
| 工作温度 | -40°C to +85°C |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
LMX2531LQ1742/NOPB 引脚配置
| 引脚 1 | VCC — Power supply |
| 引脚 2 | GND — Ground |
| 引脚 3 | CPOUT — Charge pump output |
| 引脚 4 | VCO — VCO output |
| 引脚 5 | GND — Ground |
| 引脚 6 | RF_OUT — RF output |
| 引脚 7 | GND — Ground |
| 引脚 8 | VCC — Power supply |
| 引脚 9 | DATA — Serial data input |
| 引脚 10 | CLK — Serial clock input |
| 引脚 11 | LE — Load enable |
| 引脚 12 | GND — Ground |
典型应用
LMX2531LQ1742/NOPB 适用于 6 应用s: Wireless Base Stations, Point-to-Point Radios, Satellite Communications, Test and Measurement Equipment, RF Transceivers, Aerospace and Defense.
Wireless Base Stations
The LMX2531LQ1742/NOPB provides a low-phase-noise local oscillator for wireless base stations, operating in the 1.8 GHz band. Its integrated VCO and PLL simplify the RF chain, reducing component count and board space. The device's low power consumption and high supply-noise immunity ensure reliable performance in demanding base station environments. With a frequency range of 1760-1866 MHz, it covers common cellular bands, making it a versatile choice for infrastructure equipment.
推荐
Point-to-Point Radios
In point-to-point microwave links, the LMX2531LQ1742/NOPB generates the RF carrier with excellent phase noise, critical for maintaining signal integrity over long distances. The integrated VCO and PLL reduce external components, enabling compact radio designs. The device's wide frequency range and low power consumption make it suitable for battery-powered or solar-powered remote radios. Its industrial temperature range ensures operation in outdoor environments.
推荐
Satellite Communications
The LMX2531LQ1742/NOPB is used in satellite communication systems for L-band downconversion and upconversion. Its low phase noise and high frequency accuracy ensure reliable data transmission. The integrated LDOs provide excellent supply-noise immunity, which is crucial in satellite payloads where power supply noise can degrade performance. The compact WQFN package saves valuable board space in space-constrained satellite electronics.
推荐
Test and Measurement Equipment
In test and measurement instruments, the LMX2531LQ1742/NOPB provides a stable and accurate frequency reference for signal generators and spectrum analyzers. Its wide frequency range and low phase noise enable precise measurements. The device's programmability allows for flexible frequency planning, essential for versatile test equipment. The industrial temperature range ensures consistent performance in lab and field environments.
推荐
RF Transceivers
The LMX2531LQ1742/NOPB is a key component in RF transceivers, providing the local oscillator signal for frequency conversion. Its integrated VCO and PLL simplify the design, reducing the number of external components. The device's low phase noise improves receiver sensitivity and transmitter spectral purity. The wide frequency range supports multiple bands, making it a flexible solution for multi-band transceivers.
推荐
Aerospace and Defense
In aerospace and defense applications, the LMX2531LQ1742/NOPB is used in radar systems, electronic warfare, and secure communications. Its high reliability and wide temperature range make it suitable for harsh military environments. The integrated LDOs provide excellent supply-noise immunity, critical in systems with multiple power rails. The compact package and low power consumption are advantageous for airborne and portable equipment.
推荐
推荐产品汇总
工程参考数据： LMX2531LQ1742/NOPB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LMX2531LQX1742/NOPB | LMX2531LQ1742E/NOPB | LMX2531LQ1700E/NOPB |
|---|---|---|---|---|
| Package | 36-WQFN (NJG) | 36-WQFN (NJG) | 36-WQFN (NJG) | 36-WQFN (NJG) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Frequency Range | 1760-1866 MHz | 1760-1866 MHz | 1760-1866 MHz | 1700 MHz |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +105°C | -40°C to +85°C |
| Integrated VCO | Yes | Yes | Yes | Yes |
| Integrated LDOs | Yes | Yes | Yes | Yes |
| RoHS Compliant | Yes | Yes | Yes | Yes |
| Price (1pc) | $12.50 | $12.50 | $13.00 | $11.00 |
关键差异点
- Integrated VCO and PLL in a single package （对比 Discrete PLL+VCO solutions)
- Ultra-low noise integrated LDOs （对比 External LDOs)
- Wide frequency range (1760-1866 MHz) （对比 LMX2531LQ1700E/NOPB)
设计说明
The LMX2531LQ1742/NOPB has integrated LDOs for the PLL and VCO, but it still requires a clean power supply. Use a low-noise LDO to supply VCC and place decoupling capacitors (100nF and 10uF) close to the VCC pins. Avoid sharing the supply with digital circuits to prevent noise coupling.
For optimal RF performance, use a solid ground plane under the device and solder the exposed pad to it. Keep the loop filter components close to the CPOUT pin and use short, wide traces. Follow the layout guidelines in the datasheet to minimize parasitic inductance and capacitance.
A common mistake is neglecting the loop filter design. The loop filter bandwidth affects phase noise and lock time. Use the design equations in the datasheet to select appropriate component values. Also, ensure the serial interface (DATA, CLK, LE) is properly initialized to avoid unintended frequency settings.
合规信息
RoHS compliant per /NOPB suffix. Other compliance data not provided.
