National Manuals

NATIONAL ADC101C021/ADC101C027 handbook

ADC101C021/ADC101C027 I2C-Compatible, 10-Bit Analog-to-Digital Converter (ADC) with Alert Function

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NATIONAL SEMICONDUCTOR - LM80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor handbook

The LM80 is an I2C interface that monitors microprocessor system hardware. It can measure temperature, voltage, fan speed, etc., and has watchdog comparison functions, which can monitor and reset external circuits. It is suitable for both linear and digital temperature sensors, and it has a 2.8V to 5.75V power supply voltage range, low power supply current and I2C interface, so it can be widely used in personal computers, electronic test equipment and office electronic devices.

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NATIONAL SEMICONDUCTOR LM49350 Digital Audio Interfaces handbook

The LM49350 high performance audio codec sub-system with a ground-referenced stereo headphone amplifier and an ultra low EMI class D loudspeaker amplifier with dual I2S/PCM digital audio interfaces

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NATIONAL SEMICONDUCTOR LMV225/LMV226/LMV228 Manual

The LMV225/LMV226/LMV228 are 30dB RF power detectors intended for use in CDMA and WCDMA applications. The device has an RF frequency range from 450 MHz to 2 GHz. It provides an accurate temperature and supply compensated output voltage that relates linearly to the RF input power in dBm. The circuit operates with a single supply from 2.7V to 5.5V. The LMV225/LMV226/LMV228 have an integrated filter for low-ripple average power detection of CDMA signals with 30 dB dynamic range. Additional filtering can be applied using a single external capacitor. The LMV225 has an RF power detection range from –30 dBm to 0 dBm and is ideally suited for direct use in combination with resistive taps. The LMV226/LMV228 have a detection range from –15 dBm to 15 dBm and are intended for use in combination with a directional coupler. The LMV226 is equipped with a buffered output which makes it suitable for GSM, EDGE, GPRS and TDMA applications. The device is active for Enable = HI, otherwise it is in a low power consumption shutdown mode. During shutdown, the output will be LOW. The output voltage ranges from 0.2V to 2V and can be scaled down to meet ADC input range requirements. The LMV225/LMV226/LMV228 power detectors are offered in the small 1.0 mm x 1.0 mm X 0.6 mm micro SMD package.

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NATIONAL SEMICONDUCTOR LM3671 Manual

The LM3671 is a 2MHz, 600mA step-down DC-DC converter from TI. It is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several different fixed voltage output options avail- able as well as an adjustable output voltage version range from 1.1V to 3.3V. The device offers superior features and performance for mo- bile phones and similar portable systems. Automatic intelli- gent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ.). Hys- teretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high ef- ficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ.). The LM3671 is available in SOT23-5, tiny 5-bump micro SMD and a 6-pin LLP packages in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ.) al- lows use of tiny surface-mount components. Only three ex- ternal surface-mount components, an inductor and two ceramic capacitors, are required.

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NATIONAL SEMICONDUCTOR LP3950 Color LED Driver with Audio Synchronizer Manual

The LP3950 is a color LED driver with a built-in audio synchronization feature for any analog audio input such as polyphonic ring tones and MP3 music. LEDs can be synchronized to an audio signal with two methods - amplitude and frequency. Also several fine tuning options are available for differentiation purposes. The chip also has an unique AGC (Automatic Gain Control) feature which tracks the input signal level and automatically adjusts the gain to an optimal value. The LP3950 has a high efficiency magnetic DC/DC converter with programmable output voltage and switching frequency. The converter has high output current capability so it is also able to drive flash LEDs in camera phone applications. The LP3950 is similar to LP3933 and LP3936 in that the color LEDs (or RGB LEDs) can also be programmed to generate light patterns (programmable color, intensity, on/off timing, slope and blinking cycle). All functions are software controllable through a SPI or I2C compatible interface but the device also supports one pin control for enabling predefined (default) audio synchronization mode.

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NATIONAL SEMICONDUCTOR LP3985 handbook

LP3985 is a micropower, 150mA low-noise ultra low-dropout CMOS voltage regulator designed for portable and wireless applications with demanding performance and space requirements. It delivers ultra low noise, extremely low dropout voltage, and low quiescent current optimized for battery powered systems. It has good power supply rejection and is suitable for low input voltage levels common to battery operated circuits. It is an ideal choice for mobile phone and similar battery powered wireless applications.

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NATIONAL SEMICONDUCTOR LM2787 Low Noise Regulated Switched Capacitor Voltage Inverter in micro SMD handbook

The LM2787 is a CMOS negative regulated switched capacitor voltage inverter that provides a very low noise adjustable output for devices with an input voltage in the range of +2.7V to +5.5V. This product uses four low-cost capacitors to provide up to 10mA of output current. The regulated output for the LM2787 is adjustable between -1.5V and -5.2V. The LM2787 operates at a switching frequency of 260kHz (typical) to reduce output resistance and voltage ripple. With an operating current of only 400µA (charge pump power efficiency greater than 90% with most loads) and 0.05µA typical shutdown current, the LM2787 is ideal for cellular phone power amplifier bias and other low current, low noise negative voltage needs. The device comes in small 8-Bump micro SMD and thin micro SMD packages.

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National Semiconductor LM3500 Synchronous Step-up DC/DC Converter for White LED Applications datasheet

The LM3500 is a synchronous step-up DC/DC converter designed specifically for white LED applications in cellular phone backlighting requiring low current and high efficiency.

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NATIONAL SEMICONDUCTOR DAC0808 8-Bit D/A Converter Manual

The DAC0808 is a 8-bit D/A converter produced by National Semiconductor Corporation, with a relative accuracy of ±0.19%, full scale current matching of ±1 LSB, a fast settling time of 150 ns, and non-inverting digital inputs compatible with TTL and CMOS.

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NATIONAL ADC081C021/ADC081C027 handbook

The ADC081C021/ADC081C027 is an I2C-compatible, 8-bit analog-to-digital converter (ADC) with Alert Function. It features low power consumption, single supply, high accuracy, high resolution, high speed, and small package.

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NATIONAL SEMICONDUCTOR LM3500 Synchronous Step-up DC/DC Converter for White LED Applications handbook

The LM3500 is a fixed-frequency step-up DC/DC converter that is ideal for driving white LEDs for display backlighting and other lighting functions. This device features fully integrated synchronous switching (no external Schottky diode required) and a low feedback voltage (500mV), making it highly efficient for lighting applications in wireless phones and other portable products (single cell Li-Ion or 3-cell NiMH battery supplies). The LM3500 operates with a fixed 1MHz switching frequency. When used with ceramic input and output capacitors, the LM3500 provides a small, low-noise, low-cost solution. Two LM3500 options are available with different output voltage capabilities. The LM3500-21 has a maximum output voltage of 21V and is typically suited for driving 4 or 5 white LEDs in series. The LM3500-16 has a maximum output voltage of 16V and is typically suited for driving 3 or 4 white LEDs in series (maximum number of series LEDs dependent on LED forward voltage). If the primary white LED network should be disconnected, the LM3500 uses internal protection circuitry on the output to prevent a destructive over-voltage event. A single external resistor is used to set the maximum LED current in LED-drive applications. The LED current can easily be adjusted using a pulse width modulated (PWM) signal on the shutdown pin. In shutdown, the LM3500 completely disconnects the LED power supply to prevent LED damage.

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NATIONAL SEMICONDUCTOR TP3094 COMBO Quad PCM Codec/Filter Manual

The TP3094 is a monolithic PCM Codec and Filter device implemented using a digital signal processing architecture. It provides four voice channels, combining transmit bandpass and receive low pass channel filters with companding A-law or m-law PCM encoders and decoders. The device is fabricated using National’s advanced CMOS process. The device includes anti-aliasing filters and sigma-delta converters dedicated to each channel, and by a common signal processing unit which performs all the remaining filtering and processing for the four channels. The TP3094 includes a flexible PCM digital interface, which allows the device to be connected to PCM busses of different formats. It can also be connected with other TP3094 devices in a cascade fashion, for a system with up to 128 POTS interfaces (when a 2.048MHz PCM bus is used).

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NATIONAL SEMICONDUCTOR LP3943 RGB/White/Blue 16-LED Fun Light Driver handbook

LP3943 is an integrated device capable of independently driving 16 LEDs. This device also contains an internal precision oscillator that provides all the necessary timing required for driving each LED. Two prescaler registers along with two PWM registers provide a versatile duty cycle control. The LP3943 contains the ability to dim LEDs in SMBUS/I2C applications where it is required to cut down on bus traffic. Traditionally, to dim LEDs using a serial shift register such as 74LS594/5 would require a large amount of traffic to be on the serial bus. LP3943 instead requires only the setup of the frequency and duty cycle for each output pin. From then on, only a single command from the host is required to turn each individual open drain output ON, OFF, or to cycle a programmed frequency and duty cycle. Maximum output sink current is 25 mA per pin and 200 mA per package. Any ports not used for controlling the LEDs can be used for general purpose input/output expansion.

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NATIONAL LM3702/LM3703 Manual

LM3702/LM3703 microprocessor supervisory circuits with low line output and manual reset

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NATIONAL DAC121C081/ DAC121C085 handbook

The DAC121C081/ DAC121C085 is a 12-bit micro power digital-to-analog converter (DAC) with an I2C-compatible interface. It provides a wide dynamic output range and fast settling time. The DAC121C081 uses the supply voltage as the reference and has low power consumption. The DAC121C085 provides more address options and uses an external reference voltage. Both have a 2-wire I2C-compatible serial interface and power management features.

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NATIONAL SEMICONDUCTOR LM83 handbook

The LM83 Digital Temperature Sensor is a two-wire serial interface product that uses a Delta-Sigma analog-to-digital converter with a digital over-temperature detector to sense the voltage and thus the temperature of three remote diodes.

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NATIONAL LM2931 handbook

The LM2931 series low dropout regulators are adjustable output regulators with ON/OFF pin. It has very low quiescent current and extremely low input-output differential, which makes it ideal for standby power systems. Applications include memory standby circuits, CMOS and other low power micro processor power supplies as well as systems demanding as much as 100mA of output current. The series includes a fixed 5V output (±3.8% tolerance, A grade) or an adjustable output, which is available in a TO-220 power package, TO-263 surface mount package and an 8-lead surface mount package.

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NATIONAL LP3944 handbook

LP3944 RGB/White/Blue 8-LED Fun Light Driver is an LED driver chip launched by Infineon. It integrates 8-channel LED driver circuits and an internal precision oscillator, which can independently drive 8 LEDs and support PWM dimming.

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NATIONAL SEMICONDUCTOR -LMK02000 handbook

The LMK02000 precision clock conditioner combines the functions of jitter cleaning/reconditioning, multiplication, and distribution of a reference clock. It features 20 fs additive jitter, an integrated Integer-N PLL, a clock output frequency range of 1 to 800 MHz, 3 LVDS and 5 LVPECL clock outputs, dedicated divider and delay blocks, and a pin compatible family of clocking devices.

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