1.8V Video Amplifier with Video Load Detect Automatically Adjusts Power Consumption and Helps Reduce Overall System Power Consumption
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1.8V Video Amplifier with Built-In Load Detection
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Note to Editor:
- MAX9516 video amplifier has a built-in load detect feature that intelligently detects and reports the change of video output load status.
- The MAX9516 automatically changes its operating mode and adjusts its power consumption based on the video-output load status.
- Customers can use the MAX9516's load status report flag to turn on/off other power-hungry components in the video circuit (e.g., a video encoder).
- Leveraging Maxim's unique 1.8V digital video amplifier technology, the MAX9516 consumes 75% less average power than existing solutions from other vendors. Customers can potentially eliminate an analog supply and save both space and cost.
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SUNNYVALE, CA—January 31, 2008—Maxim Integrated Products (Pink Sheets: MXIM) introduces the MAX9516 video amplifier, which detects and reports the presence of a video load and reduces power consumption when the load is not present. Using Maxim's latest 1.8V technology, the MAX9516 lowers power consumption 75% below other solutions.
The MAX9516 leverages the Company's DirectDrive™ technology to generate a clean, internal negative supply. By combining the internal negative power supply with the external positive 1.8V supply, the device drives a 2VP-P video signal into a 150Ω load. Operating at the 1.8V single power supply, the MAX9516 only consumes 6mW quiescent power and 12mW average power while a typical competitive video filter amp operating at 3.3V burns at least 46mW of average power. (See the accompanying Comparison Table.) If customers use the 1.8V digital supply, they can even eliminate the analog supply, which will be a major added convenience and greatly simplify designs. Offered in a 2mm x 2mm µDFN package, the MAX9516 is perfect for portable applications like digital still cameras (DSC), digital camcorders (DVC), and mobile phones.
Typical Video Amplifiers Cannot Detect a Video Load
Traditionally, video amplifiers do not have video load detection. Consequently, customers need to add an external circuit or a specialized video connector to detect the presence of a video load. These methods have a notable disadvantage: they can only detect whether a cable has been connected to the device, and cannot determine if there is an actual video load at the other end of the cable. The specialized connector requires more board space and is more costly. The availability of such connectors can be limited as well.
Video Load Detection with the MAX9516
The MAX9516 provides customers with a highly integrated solution to the problem. With a built-in load detection and reporting feature, the tiny MAX9516 detects a 75Ω video load. When the load is not present, the MAX9516 automatically places itself in a 31µW low-power-consumption state. In addition, the MAX9516 reports a change-of-load status with a LOAD flag, which can be connected to a video encoder or other components to trigger the power on and off.
Reduction of Video DAC Power Consumption
If a MAX9516 is used with a video DAC, the power consumption of the video DAC can be reduced. Since the MAX9516 has a high-impedance input, the video DAC's output resistor can be increased by at least four times, from 37.5Ω nominally to 150Ω. In addition, the output current of the video DAC can be reduced by a factor of four, because the full-scale input level of the MAX9516 is 0.25VP-P, whereas the typical full-scale input level is 1VP-P. With both changes, the output current can be reduced by a total factor of 16.
For the utmost power saving, the supply voltage of the video DAC can be reduced from 3.3V to 1.8V. The MAX9516 makes this circuit modification possible because it accepts a 0.25VP-P video signal, leaving enough headroom for the DAC output stage. With the drop in both output current and supply voltage, the DAC power consumption is substantially reduced.
Built to Operate from the 1.8V Digital Power Supply
The high PSRR spec (49dB at 100kHz) of the MAX9516 is designed to reject the noise from digital power supplies. Customers can use the digital 1.8V power supply to power these analog video amps and potentially eliminate the analog supply to save space and cost.
Additional Benefits of DirectDrive Technology
Historically, setting the video black level near ground required capacitors. The DirectDrive technology features an integrated charge pump and an internal linear regulator to create a clean negative power supply to drive the sync below ground. The DirectDrive approach thus eliminates bulky (and sometimes costly) output coupling capacitors and sets the video black level near ground. DirectDrive technology is another reason why the MAX9516 saves board space and reduce costs.
Transparent Input Sync-Tip Clamps Offer Flexibility
For added design flexibility, the MAX9516 supports DC-coupled inputs and can be directly connected to the output of a video DAC. The device also features a transparent input sync-tip clamp, allowing AC-coupling of input signals with different DC biases.
Summary of MAX9516 Key Features
- 1.8V or 2.5V Single-Supply Operation
- Low Power Consumption (6mW Quiescent Power, 12mW Average Power)
- Video Load Detection
- Video Reconstruction Filter with 8MHz Passband
- DirectDrive Technology Sets Video Output Black Level near Ground
- DC-Coupled Input/Output
- Transparent Input Sync-Tip Clamp
To provide additional operational protection, the MAX9516 is offered in the -40°C to +125°C automotive temperature range. The MAX9516 is priced at $0.55 (1000-up, FOB USA) and is available in a 10-pin µDFN package. Samples and evaluation (EV) kits are available. For more information please visit: http://www.maxim-ic.com/MAX9516-Amp
Maxim Integrated Products, a two billion dollar company, designs and manufactures ICs for analog and mixed-signal applications. The company's broad portfolio of 27 product lines is among the industry's deepest, with over 5400 products.
Comparison Table http://www.maxim-ic.com/MAX9516-Table
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