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DESIGN IDEA
Powering Applications Processors with a Multifunction Integrated Power Solution
Alan Moore, Marketing Engineer, Portable Power Systems
Power consumption and battery life are major obstacles that system designers have to consider when designing for portable battery-operated systems. One system that requires sophisticated power management to achieve maximum battery life is one that incorporates a high-performance applications processor. An example is Intel's PXA27x XScale® applications processor. This device requires up to 12 different power domains for the processor, IOs and internal subsystems to function with peak performance and optimized efficiency. Intel's PXA27x processor has multiple power-supply inputs which can be turned on and off as demanded by the CPU's power management software. Its flexible power management architecture controls the selection of the internal and external peripherals that can be powered at any given time.
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NEW PRODUCTS - View National's Complete List of New Products
Boomer Audio Amplifier Improves RF Suppression in Wireless Notebooks and Other Portable Devices
 New Audio Amp Provides Cleaner Sound in Wireless Applications that features innovative internal circuitry that suppresses RF signals from passing through the amplifier. This is important because certain types of RF signals can create distracting noise that is heard through the speaker. National's LM4884 is designed to suppress strong RF signals and produce clean sound in notebook computers enabled with WiFi/802.11, GSM cards or modems. The device also suppresses RF noise generated by cell phones or other wireless devices operating in close proximity to the notebook computer.
In addition to RF suppression circuitry, National's LM4884 Boomer audio amplifier offers four flexible gain selections from 6dB to 21.6dB, using a two-bit gain select. When operating on a single 5V supply, it delivers 1.2W, 1.9W or 2.1W (typical) of output power to an 8 Ohm, 4 Ohm or 3 Ohm bridge-tied load (BTL), respectively. The LM4884 delivers high-quality output power from a surface-mount package, requires few external components, has an active-low micropower shutdown mode input and provides thermal shutdown protection.
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New Amplifiers Break Gigahertz Barrier for High-Speed Applications: 1.2 GHz Amplifier Provides Gigahertz Speed and 650 MHz Programmable Buffer Improves Gain Accuracy
 Based on National's high-speed VIP10 manufacturing process, the 1.2 GHz amplifier and programmable gain buffer enable high signal fidelity and stability for improved performance in high-speed applications such as video, test and measurement, and other industrial applications. High large-signal bandwidth and fast slew rates allow National's new devices to drive high-resolution red, green and blue (RGB) video. The dynamic performance of these amplifiers is ideal for driving single-ended high-speed analog-to-digital converters (ADCs).
The LMH6703 is the industry's most stable 1.2 GHz amplifier for high-speed signals, making it less dependent on PC board layout compared to most solutions currently on the market. It features the industry's highest large-signal (2Vpp) bandwidth at 750 MHz and 4500V/us slew rate for better signal fidelity, resulting in improved performance in high-end video applications with UXGA (1600 x 1200, 75 Hz) resolutions and beyond. Additionally, the LMH6703 has a shutdown feature, provides 0.1 dB gain flatness out to 150 MHz, and low second/third harmonic distortion of -87/-100 dBc at 5 MHz for driving single-ended high-speed ADCs.
The LMH6704 is a 650 MHz programmable gain buffer with internal gain-setting resistors, allowing the user to set the gain at -1, +1, or +2. It provides a shutdown feature, 0.1 dB gain flatness out to 200 MHz, and low second/third harmonic distortion of -62/-78 dBc at 10 MHz. The LMH6704's low differential phase and gain specifications provide less luminance and chrominance distortion when driving composite video signals. The high output current (90 mA) allows both the LMH6703 and LMH6704 to drive low-impedance, high-capacitive loads in any application.
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New Family of 36 ADCs with Guaranteed Performance Across Speeds from 50 KSPS to 1 MSPS
National’s new ADC family will include 8-, 10- and 12-bit parts in one-, two-, four- and eight-channel configurations across three speed ranges for a total of 36 parts covering the most common general-purpose applications.
About the General-Purpose ADCs
| Resolutions: 8 / 10 / 12 Bit |
Three Speed ranges: |
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Channels: 1 / 2 / 4 / 8
Interface: SPI
Supply Voltage: +2.7 to +5.25
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- 50ksps to 200ksps
- 200ksps to 500ksps
- 500ksps to 1Msps
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General Purpose ADC Family Features
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Standard pin-out for each A/D channel configuration provides easy migration from 8 to 10 to 12 bit and from 50ksps to 1Msps.
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Customers can standardize board layouts for each channel configuration, saving engineering time and cost.
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Excellent INL, DNL, SINAD, Offset and Gain Performance
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Guaranteed performance over speed
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Very low power consumption
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Small packages
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