Overview
The LMH0034MAX/NOPB, produced by Texas Instruments, is a monolithic integrated circuit designed as an adaptive cable equalizer. This device is compliant with SMPTE 292M, SMPTE 344M, and SMPTE 259M standards, making it suitable for serial digital interfaces. It supports a wide range of data rates from 125 Mbps to 1.485 Gbps and is particularly useful for equalizing data transmitted over coaxial cables or other media with similar dispersive loss characteristics.
The LMH0034 implements DC restoration and can handle pathological data conditions, making it versatile for various applications in the broadcast and video transmission industries. It operates on a single 3.3V supply and features manual bypass, cable length indicator, and output mute with a programmable threshold.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage | 3.3V ±5% | V |
| Input Data Rate | 125 Mbps to 1.485 Gbps | bps |
| Input Voltage Swing | 720 to 950 mVp-p | mVp-p |
| Output Voltage Swing | 750 mVp-p (differential) | mVp-p |
| Output Resistance | 50 Ω (single-ended) | Ω |
| Input Return Loss | 15 to 20 dB | dB |
| Input Resistance | 1.3 kΩ (single-ended) | kΩ |
| Input Capacitance | 1 pF (single-ended) | pF |
| Power Consumption | 208 mW (typical at 3.3V) | mW |
| Operating Temperature | 0°C to +85°C | °C |
| Package Type | SOIC (D) with 16 pins |
Key Features
- SMPTE Compliance: Compliant with SMPTE 292M, SMPTE 344M, and SMPTE 259M standards.
- Wide Data Rate Support: Supports data rates from 125 Mbps to 1.485 Gbps.
- DC Restoration: Implements DC restoration to handle pathological data conditions.
- Manual Bypass: Allows bypassing equalization and DC restoration for low data rate applications.
- Cable Length Indicator: Provides a voltage inversely proportional to the cable length being equalized.
- Output Mute with Programmable Threshold: Mutes the output when no signal is present or at a selectable level of signal degradation.
- Single-Ended or Differential Input: Flexible input drive options.
- 50Ω Differential Outputs: Internally loaded outputs producing a 750 mVp-p differential output.
- Single 3.3V Supply Operation: Operates on a single 3.3V supply.
Applications
- SMPTE 292M, SMPTE 344M, and SMPTE 259M Serial Digital Interfaces: Ideal for serial digital video transmission and reception.
- Serial Digital Data Equalization and Reception: Used in various broadcast and video transmission systems.
- Data Recovery Equalization: Effective in recovering data from cables with significant dispersive loss.
- Replacement for Gennum GS1524 and GS1524A: Form-fit-function compatible, making it a suitable replacement.
Q & A
- What are the supported data rates for the LMH0034?
The LMH0034 supports data rates from 125 Mbps to 1.485 Gbps.
- What standards is the LMH0034 compliant with?
The LMH0034 is compliant with SMPTE 292M, SMPTE 344M, and SMPTE 259M standards.
- What is the purpose of the DC restoration feature?
The DC restoration feature is used to handle pathological data conditions and ensure proper signal handling.
- Can the LMH0034 be bypassed for low data rate applications?
- How does the cable length indicator work?
The cable length indicator provides a voltage inversely proportional to the cable length being equalized.
- What is the output voltage swing of the LMH0034?
The output voltage swing is 750 mVp-p for differential outputs.
- What is the typical power consumption of the LMH0034?
The typical power consumption is 208 mW at 3.3V supply voltage.
- What package type is the LMH0034 available in?
The LMH0034 is available in a SOIC (D) package with 16 pins.
- Can the LMH0034 handle both single-ended and differential inputs?
- What is the operating temperature range of the LMH0034?
The operating temperature range is from 0°C to +85°C.
