LTC2852IMS#PBF - 3.3V 20Mbps RS485/RS422 Transceiver | ADI
料号： LTC2852IMS#PBF ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $6.96 | $6.96 |
| 10 | $5.97 | $59.70 |
| 100 | $4.69 | $469.00 |
| 500 | $4.07 | $2,035.00 |
| 1,000 | $3.55 | $3,550.00 |
LTC2852IMS#PBF 概述
An RS485/RS422 transceiver is a differential line driver/receiver IC that translates between a single-ended UART/logic interface and a twisted-pair differential bus, enabling robust, long-reach, noise-immune communication in industrial, building-automation, and instrumentation systems. The LTC2852 belongs to the broader RS-422/RS-485 interface IC category (sub-category of Interface ICs) within the broader semiconductor power management and signal-chain ecosystem. Its 3.3V supply aligns with modern low-voltage MCUs and FPGAs, eliminating the level shifters required by legacy 5V transceivers.
Key features include 3.3V single-supply operation, 20 Mbps data rate, 1/8th unit load (256-node fan-out on C/I grade), integrated hot-swap/tolerant driver outputs that remain high-impedance across the full common-mode range when disabled, low current per package (500 µA typical supply current), and industry-standard RS485/RS422 pinout. The MSOP-10 footprint enables compact node designs typical of multi-drop industrial backbones.
Internally, the LTC2852 uses a precision differential line driver with slew-rate-limited edges (for low EMI) and a window-comparator receiver topology that detects 200 mV differential signals as required by TIA/EIA-485. The one-eighth unit-load input impedance reduces bus loading by 8× compared to legacy 1-unit-load parts, allowing more nodes on the same bus without exceeding the 32-unit-load RS485 specification limit.
Typical applications include industrial fieldbus networks (Modbus, Profibus DP at 20 Mbps), building automation (BACnet MS/TP, lighting control), point-of-sale peripherals, multi-drop motor controller links, and RS422 point-to-point communication between embedded controllers and sensors. Designers choose the LTC2852 when they need a 3.3V-only transceiver with a small package, robust hot-swap performance, and high node count.
When designing with this device, place 100 nF supply bypass capacitors within 5 mm of the VCC pin, use a 100 Ω termination resistor at each bus end, and verify common-mode protection in electrically noisy environments. The #PBF suffix denotes a lead-free, RoHS-compliant finish.
This page synthesizes distributor pricing, parametric alternates, and practical design notes that complement - and go beyond - the manufacturer datasheet's nominal spec table.
直接替换替代料： LTC2852IMS#PBF ——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：
LTC2852HMS#PBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2852IMS#TRPBF
✅ 直接替换📋 参考替代料（不在目录中）
LTC2852CMS#PBF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC2851IMS#PBF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC2850IMS#PBF
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LTC2852IMS#PBF 规格参数
| Protocol | RS-422, RS-485 |
| 功能 | Transceiver (1 driver + 1 receiver, full-duplex) |
| Number of Drivers/Receivers | 1/1 |
| 数据速率 | 20 Mbps |
| 电源电压 | 3.3 V |
| Receiver Input Load | 1/8 unit load (up to 256 nodes, C/I grade) |
| Failsafe Receiver | Yes (logic-high on open/short/terminated inputs) |
| Hot-Swap Tolerant Driver | Yes (high-Z output when disabled over common-mode range) |
| 工作温度 | -40 °C to +85 °C (I grade) |
| 封装 | 10-MSOP |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (Pb-Free #PBF finish) |
| Lead-Free Finish | Yes (PBF suffix) |
LTC2852IMS#PBF 引脚配置
| 引脚 1 | RO — Receiver output (logic side) |
| 引脚 2 | RE — Receiver enable (active-low) |
| 引脚 3 | DE — Driver enable (active-high) |
| 引脚 4 | DI — Driver input (logic side) |
| 引脚 5 | GND — Ground |
| 引脚 6 | A — Non-inverting receiver input (bus side) |
| 引脚 7 | B — Inverting receiver input (bus side) |
| 引脚 8 | Z — Inverting driver output (bus side) |
| 引脚 9 | Y — Non-inverting driver output (bus side) |
| 引脚 10 | VCC — 3.3 V supply |
典型应用
LTC2852IMS#PBF 适用于 6 应用s: Industrial Fieldbus Networks (Modbus / Profibus), Building Automation (BACnet MS/TP, Lighting Control), Multi-Drop Motor Controller Links, Point-of-Sale (POS) Peripherals, RS-422 Point-to-Point High-Speed Data Links, Security and Surveillance Camera Networks.
Industrial Fieldbus Networks (Modbus / Profibus)
The LTC2852IMS#PBF fits 20 Mbps industrial fieldbus networks where Modbus RTU, Profibus DP, and similar RS-485 protocols drive multi-drop backbones across factory floors. Its 1/8 unit-load receiver supports up to 256 nodes per bus (C/I grade) per the ADI datasheet (285012fe), eliminating the need for repeaters in dense sensor clusters. Failsafe receiver output prevents bus glitches when a node is hot-swapped, and the hot-swap tolerant driver survives mid-bus insertion without bus contention. Place 100Ω termination at both bus ends and 100 nF bypass on VCC within 5mm of the IC.
推荐
Building Automation (BACnet MS/TP, Lighting Control)
Building-automation backbones using BACnet MS/TP run on RS-485 at 76.8 kbps to 115.2 kbps, well within the LTC2852IMS#PBF's 20 Mbps capability. The 3.3V single-supply design lets designers power the transceiver directly from a 3.3V MCU rail, reducing BOM and PCB area. Failsafe receiver output ensures lights and HVAC nodes report a known-good state when a cable is disconnected, while 1/8 unit load allows long daisy chains with many thermostats and sensors. The MSOP-10 footprint fits inside standard in-wall back-boxes.
推荐
Multi-Drop Motor Controller Links
Stepper and servo motor controllers in industrial machinery often communicate via RS-485 multi-drop. The LTC2852IMS#PBF provides full-duplex, 20 Mbps signaling that lets a master controller simultaneously send position commands and receive encoder feedback over separate differential pairs, reducing latency. Per the ADI datasheet (285012fe), its -40°C to +85°C industrial range tolerates the heat of sealed motor enclosures. Hot-swap driver output prevents backplane corruption when a drive is replaced online. Use 120Ω termination and shielded cable near VFD-driven motors.
推荐
Point-of-Sale (POS) Peripherals
POS terminals use RS-485 to link barcode scanners, receipt printers, scales, and customer displays to a head terminal over long cable runs. The LTC2852IMS#PBF's 20 Mbps data rate supports simultaneous polling of multiple peripherals. Failsafe receiver (per ADI datasheet 285012fe) prevents false readings when a peripheral cable is unplugged. The 3.3V supply matches modern POS SoCs. The MSOP-10 footprint leaves room for the peripheral's barcode optics and power supply on a tight PCBA.
推荐
RS-422 Point-to-Point High-Speed Data Links
The LTC2852IMS#PBF operates as a full-duplex RS-422 transceiver for high-speed point-to-point links between embedded controllers, sensors, and instrumentation - for example, an FPGA-based data acquisition board streaming ADC samples to a host. Its 20 Mbps capability (per ADI datasheet 285012fe) handles 16-bit ADC data at >1 MSPS with margin. The single 3.3V supply eliminates level-shifter stages on each side of the link. Use twisted-pair cable with 100Ω differential impedance for best signal integrity at full speed.
推荐
Security and Surveillance Camera Networks
PTZ (pan-tilt-zoom) surveillance cameras often use RS-485 for telemetry control from a central DVR or NVR. The LTC2852IMS#PBF provides full-duplex 20 Mbps signaling (per ADI datasheet 285012fe) that supports simultaneous pan, tilt, zoom commands and telemetry feedback. Failsafe receiver output prevents the camera from drifting to a random state when the bus is disconnected. The 3.3V supply lets the transceiver share the camera's main logic rail, and the MSOP-10 footprint fits inside compact dome-camera enclosures.
推荐
推荐产品汇总
工程参考数据： LTC2852IMS#PBF ——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 | LTC2852HMS#PBF | LTC2852IMS#TRPBF | LTC2852CMS#PBF | LTC2851IMS#PBF | LTC2850IMS#PBF |
|---|---|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Operating Mode | Full-duplex (1/1) | Full-duplex (1/1) | Full-duplex (1/1) | Full-duplex (1/1) | Half-duplex | Half-duplex |
| Data Rate | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Receiver Load | 1/8 unit load | 1/8 unit load | 1/8 unit load | 1/8 unit load | 1/8 unit load | 1/8 unit load |
| Operating Temperature | -40C to +85C (I-grade) | -40C to +125C (H-grade) | -40C to +85C (I-grade) | 0C to +70C (C-grade) | -40C to +85C (I-grade) | -40C to +85C (I-grade) |
| Packaging Format | Tube (factory pack 50) | Tube | Tape & Reel (factory pack 2500) | Tube | Tube | Tube |
关键差异点
- 1/8 unit load supports 256 nodes per bus (C/I grade) （对比 Legacy 1-unit-load RS-485 transceivers)
- Hot-swap tolerant driver survives mid-bus insertion （对比 Legacy RS-485 transceivers without hot-swap)
- Failsafe receiver prevents false bus reads （对比 Transceivers without integrated failsafe)
设计说明
Place a 100 nF X7R bypass capacitor within 5 mm of the VCC pin and a 10 µF bulk capacitor near the transceiver supply rail. Keep the logic-side traces (RO, RE, DE, DI) short and isolated from the bus-side differential pair (A, B, Y, Z). Per the ADI datasheet (285012fe), the GND pin should connect to a low-impedance ground plane to minimize common-mode offset. For multi-node buses, use a star or daisy-chain topology and terminate only at the two furthest bus ends with 120 Ω resistors matching the cable differential impedance.
Do not leave RE floating - tie it to GND through a 10 kΩ resistor or to VCC if unused, otherwise the receiver output may oscillate. The DE pin must be driven to LO when the bus is being received to avoid bus contention. The failsafe receiver guarantees a logic-high output for open/short/terminated inputs (per ADI datasheet 285012fe), but only when the input differential stays within the ±200 mV threshold window. Avoid common-mode voltages outside the transceiver's rated range (verify with the datasheet - this value is not in the verified web data).
Route the A/B and Y/Z differential pairs as a 100 Ω differential microstrip with continuous ground reference below. Keep stub lengths under 10 mm to maintain signal integrity at 20 Mbps. For the MSOP-10 package, expose the copper pad under the IC for thermal relief (no exposed pad, so standard ground pour is sufficient). Use shielded cable (STP) when routing near VFDs or motor phases, and ground the shield at one end only to avoid ground loops.
合规信息
Pb-Free finish per #PBF suffix. RoHS compliant per ADI product page. Not AEC-Q100 qualified - choose a Q1-grade RS-485 part (e.g. ADM3065E) for automotive.
