LMX2572LP - 2GHz Low Power RF Synthesizer | Texas Instruments
MPN: LMX2572LP ✓ Hoạt độngLMX2572LP Tóm tắt
An RF synthesizer is a key building block in communication systems, generating precise local oscillator signals for frequency conversion. It typically consists of a phase-locked loop (PLL) with a voltage-controlled oscillator (VCO), frequency dividers, and a phase detector. The LMX2572LP integrates these functions, providing a complete frequency synthesis solution in a compact 40-pin VQFN package.
Key features include excellent phase noise of -124 dBc/Hz at 100-kHz offset with an 800-MHz carrier, a PLL figure of merit of -232 dBc/Hz, and normalized 1/f noise of -123.5 dBc/Hz. The 32-bit N-divider allows fine frequency resolution, and the device supports FSK modulation for digital mobile radio (DMR) and wireless microphone applications.
The LMX2572LP uses a wideband PLL architecture with an integrated VCO, achieving low phase noise and fast settling. The integrated LDOs provide clean supply rails, reducing external component count and improving noise performance. The device operates from a single 3.3-V supply, simplifying power supply design.
Typical applications include DMR radios, wireless microphones, test and measurement equipment, and any system requiring a low-power, low-noise frequency source. The wide frequency range and FSK support make it versatile for various wireless communication standards.
When designing with the LMX2572LP, ensure proper decoupling of the power supply pins and use a clean reference clock to achieve optimal phase noise. The device's SPI interface allows easy configuration of frequency, modulation, and output power settings.
Bộ thay thế dễ dàng lắp đặt cho LMX2572LP — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
LMX2572LPRHAR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMX2572LPRHAT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LMX2572
⚡ Đồng gói📋 Tham chiếu thay thế (không có trong danh mục)
LMX2571
⚡ Đồng gói📋 Tham chiếu thay thế (không có trong danh mục)
ADF4355
⚡ Đồng gói ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LMX2572LP Thông số kỹ thuật
| Output Frequency Range | 12.5 MHz to 2 GHz |
| Điện áp cung cấp | 3.3 V |
| Điện áp cung cấp | 70 mA |
| Phase Noise at 100 kHz Offset | -124 dBc/Hz (800 MHz carrier) |
| PLL Figure of Merit | -232 dBc/Hz |
| PLL Normalized 1/f Noise | -123.5 dBc/Hz |
| N-Divider Resolution | 32-bit |
| Modulation | FSK |
| Hộp | 40-VFQFN Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Integrated LDOs | Yes |
| Internal Doubler | No |
| Giao diện | SPI |
Cấu hình chân LMX2572LP
| Chân 1 | VCC — Power supply (3.3V) |
| Chân 2 | GND — Ground |
| Chân 3 | RF_OUT — RF output |
| Chân 4 | RF_OUTB — Complementary RF output |
| Chân 5 | VCO_VCC — VCO power supply |
| Chân 6 | VCO_GND — VCO ground |
| Chân 7 | CP_OUT — Charge pump output |
| Chân 8 | VCO_IN — VCO input |
| Chân 9 | SCK — SPI clock |
| Chân 10 | SDI — SPI data input |
| Chân 11 | CSB — SPI chip select (active low) |
| Chân 12 | SDO — SPI data output |
Ứng dụng tiêu biểu
LMX2572LP phù hợp cho 6 Áp dụngs: Digital Mobile Radio (DMR), Wireless Microphones, Test and Measurement Equipment, Portable RF Communication Devices, IoT and Smart Home Devices, Aerospace and Defense.
Digital Mobile Radio (DMR)
The LMX2572LP supports FSK modulation, making it ideal for DMR transceivers. Its low power consumption (70 mA) and wide frequency range (12.5 MHz to 2 GHz) enable compact, battery-operated designs. The integrated LDOs reduce external components, simplifying the RF front-end. With phase noise of -124 dBc/Hz, it ensures clear communication in demanding environments.
Được đề xuất
Wireless Microphones
The LMX2572LP's FSK modulation and low phase noise make it suitable for wireless microphone systems. It operates from 12.5 MHz to 2 GHz, covering UHF bands. The low power consumption extends battery life, and the integrated LDOs ensure clean supply rails. The device's small 40-VFQFN package fits space-constrained designs.
Được đề xuất
Test and Measurement Equipment
The LMX2572LP provides a stable, low-noise frequency source for signal generators and spectrum analyzers. Its wide frequency range and fine resolution (32-bit N-divider) enable precise frequency synthesis. The low phase noise improves measurement accuracy. The device's SPI interface allows easy integration into automated test systems.
Được đề xuất
Portable RF Communication Devices
The LMX2572LP's low power consumption (70 mA) and small package make it ideal for handheld radios and portable transceivers. It supports frequencies up to 2 GHz, covering various communication bands. The integrated LDOs reduce external components, saving board space. The device's FSK modulation capability supports digital communication protocols.
Được đề xuất
IoT and Smart Home Devices
The LMX2572LP can generate local oscillator signals for IoT transceivers operating in sub-GHz bands. Its low power consumption is crucial for battery-powered sensors. The wide frequency range allows flexibility in band selection. The integrated LDOs simplify power supply design, and the SPI interface enables easy configuration.
Được đề xuất
Aerospace and Defense
The LMX2572LP's high performance and low power make it suitable for aerospace and defense applications such as UAV communication links and radar systems. Its wide frequency range and low phase noise ensure reliable signal generation. The device's small form factor is advantageous for space-constrained platforms.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LMX2572LP — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LMX2572LPRHAR | LMX2572LPRHAT | LMX2572 | LMX2571 | ADF4355 |
|---|---|---|---|---|---|---|
| Package | 40-VFQFN Exposed Pad | 40-VFQFN Exposed Pad | 40-VFQFN Exposed Pad | 40-VFQFN Exposed Pad | 40-VFQFN Exposed Pad | 40-VFQFN Exposed Pad |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Output Frequency Range | 12.5 MHz to 2 GHz | 12.5 MHz to 2 GHz | 12.5 MHz to 2 GHz | 12.5 MHz to 6.4 GHz | 12.5 MHz to 3.6 GHz | 53 MHz to 6.8 GHz |
| Supply Current | 70 mA | 70 mA | 70 mA | 110 mA | 80 mA | 110 mA |
| Phase Noise at 100 kHz Offset | -124 dBc/Hz | -124 dBc/Hz | -124 dBc/Hz | -110 dBc/Hz | -110 dBc/Hz | -110 dBc/Hz |
| FSK Modulation | Yes | Yes | Yes | No | No | No |
| Integrated LDOs | Yes | Yes | Yes | Yes | Yes | No |
| Pin Compatibility | Reference | Yes | Yes | No | No | No |
Bảo phân biệt quan trọng
- Low power consumption of 70 mA (vsLMX2572)
- FSK modulation support (vsLMX2572)
- Integrated LDOs (vsADF4355)
Ghi chú thiết kế
The LMX2572LP integrates LDOs, but proper decoupling is still essential. Place 100 nF capacitors close to each VCC pin and a 10 uF bulk capacitor on the main supply. Use a clean 3.3-V supply to minimize noise coupling into the VCO.
For optimal phase noise, use a solid ground plane under the device and keep the RF output traces short and impedance-controlled (50 ohm). Avoid routing digital SPI lines near the VCO pins to prevent interference.
Ensure the reference clock is clean and stable, as phase noise is directly affected by the reference. Use a low-noise crystal oscillator and follow the layout guidelines in the datasheet. Also, verify the SPI configuration for correct frequency and modulation settings.
Thông tin tuân thủ
RoHS compliance inferred from TI's standard compliance. Other compliance data not specified in provided sources.
