LMH1229
- Adaptive cable equalizer with integrated reclocker
- Supports ST-2082-1(12G), ST-2081-1(6G), ST-424(3G), ST-292(HD), and ST-259(SD)
- Compatible with DVB-ASI and AES10 (MADI)
- Integrated referenceless reclocker locks to SMPTE rates: 11.88Gbps, 5.94Gbps, 2.97Gbps, 1.485Gbps, or divide-by-1.001 sub-rates, 270Mbps
- Typical cable reach (Belden 1694A), PRBS-9 pattern:
- 100m at 11.88Gbps (4Kp60 UHD)
- 150m at 5.94Gbps (UHD)
- 220m at 2.97Gbps (FHD)
- 300m at 1.485Gbps (HD)
- 600m at 270Mbps (SD)
- Typical cable reach (Belden 1694A), pathological pattern(1):
- 90m at 11.88Gbps (4Kp60 UHD)
- 140m at 5.94Gbps (UHD)
- 220m at 2.97Gbps (FHD)
- 300m at 1.485Gbps (HD)
- 600m at 270Mbps (SD)
- On-chip 75Ω termination and return loss compensation network
- Input cable equalizer and reclocker features:
- Improved cable reach with stress patterns
- Programmable CDR loop bandwidth settings
- 2:1 75Ω input mux (LMH1239 only)
- Output driver features:
- 1:2 100Ω fanout output with de-emphasis
- Reclocked 75Ω loop-through output with cable fault detection (up to 600m)
- Built-in PRBS generator and checker
- Internal eye opening monitor
- Single 2.5V supply
- Low power: 350mW (typical)
- Power Save mode: 70mW
- Configurable by control pins, SPI, or SMBus interface
- 5mm × 5mm 32-pin WQFN package
- Operating temperature range: –40°C to +85°C
(1)For details about SDI pathological implementation, refer to A Study of the SDI Pathological Data Pattern application note
The LMH12x9 (LMH1229, LMH1239) is a long reach adaptive cable equalizer with integrated reclocker, dual outputs, and 75Ω loop-through output. The device is designed to equalize data transmitted over 75Ω coaxial cable and operates across SMPTE data rates ranging from 125Mbps to 11.88Gbps.
The adaptive equalizer at the SDI input enables automatic loss compensation for up to 100m Belden 1694A cable reach in 4K/8K video applications where 12G-SDI (11.88Gbps) is used. The integrated reclocker attenuates high frequency jitter and fully regenerates the data using a clean, low-jitter clock. The loop filter of the reclocker is adjustable with optional external capacitor to reduce the CDR loop bandwidth.
For routing simplicity and debug, the LMH12x9 features a 1:3 output mux consisting of two 100Ω fanouts with VOD and de-emphasis control and one 75Ω loop-through SDI output. The 75Ω loop-through output is provided to extend the signal reach or enable system-level diagnostics.
The LMH12x9 features internal integrated return loss networks that meet stringent SMPTE specifications across all data rates. The LMH12x9 also has an internal eye opening monitor and a programmable pin for CDR lock indication, input carrier detect, cable fault detection, or hardware interrupts to support system diagnostics and board bring-up.
The LMH1229 is pin compatible with the LMH1297 (12G UHD-SDI bidirectional I/O with integrated reclocker) when used in cable equalizer applications. For system-level redundancy, the LMH1239 is offered with an additional integrated SDI input mux.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LMH12x9 12G UHD Long Reach Cable Equalizer with Integrated Reclocker datasheet (Rev. A) | PDF | HTML | 2024年 10月 1日 |
設計與開發
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LMH1239EVM — LMH1239 評估模組
LMH1239 是一款長距離適應性纜線等化器，具有整合式時脈重整器、雙輸入、雙輸出和 75Ω 環通輸出。本裝置旨在等化透過 75Ω 同軸電纜傳送的資料，並以 125 Mbps 至 11.88 Gbps 的 SMPTE 資料速率運作。SDI 輸入的適應性等化器可在使用 12G-SDI (11.88 Gbps) 的 4K 與 8K 視訊應用中提供高達 100m Belden1694A 纜線長度的自動損耗補償。整合式時脈重整器可衰減高頻抖動，並使用乾淨的低抖動時脈完全重新產生資料。時脈重整器環路濾波器可透過 SDI 串級應用選用的外部電容器調整。
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
TINA-TI — 基於 SPICE 的類比模擬程式
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (RTV) | 32 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。