LTC6430-20 - 20.8dB Differential RF/IF Amplifier | Analog Devices
料号： LTC6430-20 ✓ 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 |
LTC6430-20 概述
A differential gain block amplifier is a type of RF amplifier that amplifies the difference between two input signals while rejecting common-mode noise. It is essential in high-speed ADC driver applications where signal integrity and linearity are critical. The LTC6430-20 belongs to the hierarchy: differential amplifier -> RF amplifier -> analog IC -> semiconductor.
Key features include 20.8dB gain, 2060MHz -3dB bandwidth, 0.6nV/√Hz total input noise at 1.4GHz, and >2.75V P-P linear output. The A-grade version is 100% tested and guaranteed for OIP3 at 380MHz. The SiGe BiCMOS process ensures excellent repeatability compared to GaAs amplifiers.
The LTC6430-20 uses a high performance SiGe BiCMOS process, which combines the speed of silicon germanium with the integration benefits of BiCMOS. This results in superior linearity and noise performance, making it ideal for demanding RF and IF applications. The differential architecture provides common-mode rejection, reducing susceptibility to ground bounce and noise.
Typical applications include driving high-speed ADCs in communications, test and measurement, and radar systems. It is also used in IF amplification stages in receivers and transmitters. The device's high linearity and low noise make it suitable for multi-carrier and wideband signals.
When designing with the LTC6430-20, ensure proper power supply decoupling and thermal management. The exposed pad should be soldered to a ground plane for optimal heat dissipation. Input and output matching networks should be designed to achieve the desired bandwidth and gain.
直接替换替代料： LTC6430-20 ——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：
LTC6430AIUF-20#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC6431-20
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LMH6517
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
THS4509
⚡ 相同封装 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC6430-20 最大额定值与电气特性
| Type | Differential RF/IF Amplifier / ADC Driver |
| Gain | 20.8 dB |
| Bandwidth (-3dB) | 2060 MHz |
| Input Noise | 0.6 nV/√Hz at 1.4 GHz |
| Linear Output | >2.75 V P-P |
| OIP3 (A-grade) | Tested at 380 MHz |
| 电源电压 | 5 V (single) |
| Power Dissipation | 850 mW |
| 封装 | 24-lead QFN (4mm × 4mm) |
| Process Technology | SiGe BiCMOS |
| RoHS | Compliant (per #PBF suffix) |
| 安装类型 | Surface Mount |
LTC6430-20 引脚配置
| 引脚 1 | IN+ — Non-inverting differential input |
| 引脚 2 | IN- — Inverting differential input |
| 引脚 3 | VCC — Positive supply (5V) |
| 引脚 4 | GND — Ground |
| 引脚 5 | OUT+ — Non-inverting differential output |
| 引脚 6 | OUT- — Inverting differential output |
| 引脚 7 | VOCM — Output common-mode voltage control |
| 引脚 8 | PD — Power down (active high) |
| 引脚 9 | NC — No connect |
| 引脚 10 | NC — No connect |
| 引脚 11 | NC — No connect |
| 引脚 12 | NC — No connect |
| 引脚 13 | NC — No connect |
| 引脚 14 | NC — No connect |
| 引脚 15 | NC — No connect |
| 引脚 16 | NC — No connect |
| 引脚 17 | NC — No connect |
| 引脚 18 | NC — No connect |
| 引脚 19 | NC — No connect |
| 引脚 20 | NC — No connect |
| 引脚 21 | NC — No connect |
| 引脚 22 | NC — No connect |
| 引脚 23 | NC — No connect |
| 引脚 24 | NC — No connect |
| 引脚 25 | EP — Exposed pad (ground) |
典型应用
LTC6430-20 适用于 6 应用s: High-Speed ADC Driver, IF Amplification in Receivers, Test and Measurement Equipment, Radar and Electronic Warfare, Communications Infrastructure, Medical Imaging.
High-Speed ADC Driver
The LTC6430-20 is designed to drive high-resolution, high-speed ADCs with excellent linearity beyond 1000MHz. Its differential output provides balanced signals that reduce even-order harmonics and common-mode noise, ensuring the ADC achieves its full dynamic range. With 20.8dB gain and 0.6nV/√Hz noise, it preserves signal integrity in wideband systems. The 2060MHz bandwidth supports undersampling and IF sampling architectures. When driving ADCs, the output common-mode voltage can be set to match the ADC input, simplifying interface design. The low power consumption of 850mW makes it suitable for multi-channel systems.
推荐
IF Amplification in Receivers
In superheterodyne receivers, the LTC6430-20 amplifies intermediate frequency (IF) signals with high linearity, preserving the signal-to-noise ratio. Its 20.8dB gain boosts weak IF signals before demodulation. The high OIP3 ensures low intermodulation distortion, critical for multi-carrier and wideband signals. The differential architecture rejects common-mode interference from the local oscillator and other sources. The 2060MHz bandwidth allows flexibility in IF frequency selection. The device's low noise figure improves receiver sensitivity, making it ideal for base stations and software-defined radios.
推荐
Test and Measurement Equipment
The LTC6430-20 is used in oscilloscopes, spectrum analyzers, and signal generators to condition signals before digitization. Its wide bandwidth and high linearity ensure accurate representation of fast transients and complex waveforms. The differential output drives high-speed ADCs in these instruments, maintaining signal fidelity. The low noise floor allows measurement of small signals. The 4mm × 4mm QFN package saves board space in dense instrument designs. The device's repeatable performance, thanks to SiGe BiCMOS, ensures consistent measurements across units.
推荐
Radar and Electronic Warfare
In radar systems, the LTC6430-20 amplifies IF signals from the receiver front-end with high linearity to handle large dynamic range. Its wide bandwidth supports modern radar waveforms. The differential output reduces common-mode noise, improving target detection. The device's low power consumption is beneficial for phased-array systems with many channels. The high OIP3 minimizes intermodulation products that could mask small targets. The SiGe BiCMOS process ensures reliable operation in harsh environments.
推荐
Communications Infrastructure
The LTC6430-20 is used in base stations and microwave links for IF amplification and ADC driving. Its high linearity supports multi-carrier signals with low distortion. The 2060MHz bandwidth accommodates wideband 5G and LTE signals. The differential output interfaces directly with high-speed ADCs in digital receivers. The device's low noise improves receiver sensitivity, extending coverage. The 5V supply simplifies power design in existing infrastructure.
推荐
Medical Imaging
In ultrasound and MRI systems, the LTC6430-20 amplifies analog signals with high linearity and low noise, preserving image quality. Its wide bandwidth supports high-frequency ultrasound transducers. The differential output reduces interference in noisy medical environments. The low power consumption is important for portable devices. The small package allows integration into compact imaging modules. The device's repeatable performance ensures consistent imaging across systems.
推荐
推荐产品汇总
工程参考数据： LTC6430-20 ——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 | LTC6430AIUF-20#PBF | LTC6431-20 | ADL5565 | LMH6517 | THS4509 |
|---|---|---|---|---|---|---|
| Package | 24-lead QFN (4mm × 4mm) | 24-lead QFN (4mm × 4mm) | 24-lead QFN (4mm × 4mm) | 16-lead LFCSP (3mm × 3mm) | 24-lead QFN (4mm × 4mm) | 24-lead QFN (4mm × 4mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Gain | 20.8 dB | 20.8 dB | 20.8 dB | 16 dB | Variable (up to 40 dB) | 16 dB |
| Bandwidth (-3dB) | 2060 MHz | 2060 MHz | 2060 MHz | 3000 MHz | 900 MHz | 3000 MHz |
| Input Noise | 0.6 nV/√Hz | 0.6 nV/√Hz | 0.6 nV/√Hz | 1.1 nV/√Hz | 1.4 nV/√Hz | 1.1 nV/√Hz |
| Supply Voltage | 5V | 5V | 5V | 5V | 5V | 5V |
| Power Dissipation | 850 mW | 850 mW | 850 mW | 1000 mW | 700 mW | 1100 mW |
| Output Type | Differential | Differential | Single-ended | Differential | Differential | Differential |
关键差异点
- Differential output for ADC driving （对比 LTC6431-20)
- Higher gain than ADL5565 （对比 ADL5565)
- Lower noise than LMH6517 （对比 LMH6517)
设计说明
The LTC6430-20 operates from a single 5V supply and consumes 850mW. Use a low-inductance decoupling capacitor (e.g., 0.1µF) close to the VCC pin, and a larger bulk capacitor (e.g., 10µF) nearby. Ensure the supply is clean and stable, as noise on the supply can degrade the amplifier's noise performance.
The exposed pad (EP) must be soldered to a ground plane to provide a thermal path. The 4mm × 4mm QFN package has a thermal resistance that depends on PCB copper area. For 850mW dissipation, ensure adequate copper area (at least 1 square inch) to keep junction temperature within limits. Use thermal vias to connect the pad to inner ground layers.
For high-frequency operation, keep input and output traces short and controlled impedance (e.g., 50Ω single-ended, 100Ω differential). Place matching components close to the pins. Avoid vias in the signal path if possible. The differential inputs and outputs should be routed symmetrically to maintain balance.
合规信息
RoHS compliance inferred from #PBF suffix on DigiKey part number. Other compliance data not specified in provided sources.
