Industry's First 1.8V Video Amplifiers Save More than 70% Power over Existing Solutions
SUNNYVALE, CA—March 7, 2007—Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX9509/MAX9510, the industry's first 1.8V video amplifiers.
The MAX9509/MAX9510 push the power consumption limit to a new low by operating the video amps at merely 1.8V. Along with such a low-power supply, the devices leverage 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 MAX9509/MAX9510 drive a 2VP-P video signal into a 150 load. Operating at the 1.8V single power supply, these amplifiers use 70% less power; they consume 5.8mW quiescent power and 11mW average power. Moreover, if customers use the 1.8V digital supply, they can even eliminate the analog supply, which will be a major convenience and greatly simplify designs. Offered in a 2mm x 2mm TDFN, these amplifiers are perfect for portable applications such as digital still cameras (DSC), digital camcorders (DVC), and mobile phones.
Typical Video Amplifiers
Traditionally, video amplifiers had to operate on a 2.5V, or higher, single power supply to provide a voltage output range sufficient to output the 2VP-P video signal. If those devices operated at a lower single-supply voltage, the video output signal would simply cut off. With 2.5V as the lowest possible supply voltage to output a 2VP-P video signal, traditional competitive devices simply could not reduce their power consumption. Typical video amplifiers hit a limit on power consumption: the higher the supply voltage, the higher the power consumption.
The MAX9509/MAX9510 achieve their exceptional performance levels by combining the 1.8V operation with the Company's DirectDrive technology to create the full 2VP-P output range. Other IC manufacturers that offer a technology similar to DirectDrive have charge-pump circuitries that generate so much noise that the device typically becomes unusable.
The Advantage of Using 1.8V Single Supply
The MAX9509/MAX9510 consume over 70% less average power than existing solutions. As shown in the Comparison Table, the MAX9509 has an integrated filter and consumes only 11mW average power. The filter-less counterpart, MAX9510, consumes a remarkably low 10.4mW average power. A typical competitive video filter amp operating at 3.3V burns at least 46mW.
By using these 1.8V video amplifiers, video DAC power consumption is substantially reduced. The explanation for this power savings lies with the drive current and the supply voltage. The drive current is proportional to the full-scale voltage level and inversely proportional to the output resistor value. The MAX9509/MAX9510 input video signal is only 0.25VP-P, a factor of 4 lower than the normal full-scale video signal. Additionally, the DAC's output resistor value can be increased from 37.5s to 150s, another factor of 4. Therefore, the devices' drive current is reduced by a total factor of 16. Finally, with the DAC's output swing down to 0.25VP-P, the video DAC supply voltage can be lowered from 3.3V to 1.8V. With the drop in both driver 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 MAX9509/MAX9510 is designed to reject the noise from the 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. This is another reason why the MAX9509/MAS9510 save board space and reduce costs.
Transparent Input Sync-Tip Clamps Offer Flexibility
For added design flexibility, the MAX9509/MAX9510 support DC-coupled inputs and can be directly connected to the output of a video digital-to-analog converter (DAC). The devices also feature a transparent input sync-tip clamp, allowing AC-coupling of input signals with different DC biases.
Summary of MAX9509/MAX9510 Key Features
- 5.8mW Quiescent Power Dissipation
- 11mW Average Power Dissipation
- Video Reconstruction Filter with 5.5MHz Passband (MAX9509)
- DirectDrive Technology Sets Video Output Black Level near Ground
- DC-Coupled Input/Output
- Transparent Input Sync-Tip Clamp
- 10nA Shutdown Supply Current
- Operates from a 1.7V to 2.625V Single Supply
To provide additional operational protection, the MAX9509/MAX9510 are offered in the -40°C to +125°C automotive temperature range. The MAX9509 and MAX9510 are priced at $0.49 and $0.45, respectively (1000-up, FOB USA). The MAX9509 is available in an 8-pin TDFN and the MAX9510 in an 8-pin µMAX. Samples and evaluation (EV) kits are available. For more information please visit: http://www.maxim-ic.com/MAX9509/10-Amps
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