National Semiconductor Manuals

This document describes the features and characteristics of TL�H�5690 MICRO-DAC DAC1208�DAC1209�DAC1210�DAC1230�DAC1231�DAC1232 12-Bit� mP Compatible� Double-Buffered D to A Converters.

This document is about DAC1020 and DAC1220, which are respectively 10- and 12-bit binary multiplying digital-to-analog converters with excellent temperature tracking characteristics. They use CMOS current switches and drive circuitry to achieve low power consumption and low output leakage.

The DAC101S101 is a full-featured, general purpose 10-bit voltage-output digital-to-analog converter (DAC) that can operate from a single +2.7V to 5.5V supply and consumes just 175 µA of current at 3.6 Volts.

The DAC1006, DAC1007, and DAC1008 are advanced CMOS-Si-Cr 10-, 9-, and 8-bit accurate multiplying DACs designed to interface directly with the 8080, 8048, 8085, Z-80, and other popular microprocessors. These DACs appear as a memory location or an I/O port to the microprocessor, and no interfacing logic is needed. When combined with an external amplifier and voltage reference, these devices can be used as standard D-A converters and are particularly attractive for multiplying applications (such as digitally controlled gain blocks) because their linearity error is essentially independent of the voltage reference. They are also attractive in audio signal processing equipment as audio gain controls or programmable attenuators, combining high-quality audio signal processing with digitally based systems under microprocessor control. All of these DACs are double-buffered and can load all 10 bits or two 8-bit bytes, with the data format being left justified. The analog section of these DACs is essentially the same as that of the DAC1020. The DAC1006 series are the 10-bit members of a family of microprocessor-compatible DACs (MICRO-DACs). For applications requiring other resolutions, the DAC0830 series (8 bits) and the DAC1208 and DAC1230 (12 bits) are available alternatives.

The DAC0890 is a complete dual 8-bit voltage output digital-to-analog converter that can operate on a single 5V supply. It includes on-chip output amplifiers, precision bandgap voltage reference, and full microprocessor interface. Each DAC0890 output amplifier has two externally selectable output ranges, 0V to 2.55V and 0V to 10.2V. The amplifiers are internally trimmed for offset and full-scale accuracy and therefore require no external user trims. The DAC0890 is supplied in a 20-pin ceramic DIP package.

The DAC088S085 is a fully featured, general purpose OCTAL 8-bit voltage-output digital-to-analog converter (DAC) that can operate from a single +2.7V to +5.5V supply and con- sumes 1.95 mW at 3V and 4.85 mW at 5V. The DAC088S085 is packaged in a 16-lead LLP package and a 16-lead TSSOP package. The LLP package makes the DAC088S085 the smallest OCTAL DAC in its class. The on-chip output ampli- fiers allow rail-to-rail output swing and the three wire serial interface operates at clock rates up to 40 MHz over the entire supply voltage range. Competitive devices are limited to 25 MHz clock rates at supply voltages in the 2.7V to 3.6V range. The serial interface is compatible with standard SPI™, QSPI, MICROWIRE and DSP interfaces. The DAC088S085 also of- fers daisy chain operation where an unlimited number of DAC088S085s can be updated simultaneously using a single serial interface.

The DAC0854 is a complete quad 8-bit voltage-output digital-to-analog converter that can operate on a single 5V supply. It includes on-chip output amplifiers, internal voltage reference, and a serial microprocessor interface. By combining in one package the reference, amplifiers, and conversion circuitry for four D/A converters, the DAC0854 minimizes wiring and parts count and is hence ideally suited for applications where cost and board space are of prime concern. The DAC0854 also has a data readback function, which can be used by the microprocessor to verify that the desired input word has been properly latched into the DAC0854’s data registers. The data readback function simplifies the design and reduces the cost of systems which need to verify data integrity. The logic comprises a MICROWIRETM-compatible serial interface and control circuitry. The interface allows the user to write to any one of the input registers or to all four at once. The latching registers are double-buffered, consisting of 4 separate input registers and 4 DAC registers. Double buffering allows all 4 DAC outputs to be updated simultaneously. The four reference inputs allow the user to configure the system to have a separate output voltage range for each DAC. The output voltage of each DAC can range between 0...

DAC0832LCM suppliers

The DAC0830/DAC0832 8-Bit µP Compatible, Double-Buffered D to A Converters. The DAC0830 is an advanced CMOS/Si-Cr 8-bit multiplying DAC designed to interface directly with the 8080, 8048, 8085, Z80®, and other popular microprocessors. A deposited silicon-chromium R-2R resistor ladder network divides the reference current and provides the circuit with excellent temperature tracking characteristics (0.05% of Full Scale Range maximum linearity error over temperature). The cir- cuit uses CMOS current switches and control logic to achieve low power consumption and low output leakage current errors. Special circuitry provides TTL logic input volt- age level compatibility. Double buffering allows these DACs to output a voltage corresponding to one digital word while holding the next digital word. This permits the simultaneous updating of any number of DACs. The DAC0830 series are the 8-bit members of a family of microprocessor-compatible DACs (MICRO-DAC™).

The document introduces the DAC0808 series, an 8-bit monolithic digital-to-analog converter (DAC), which features a full scale output current settling time of 150 ns, power consumption of only 33 mW, and a power supply voltage range of -4.5V to -18V.

The DAC0800/DAC0802 8-bit digital-to-analog converters are high-performance, high-precision DACs produced by Texas Instruments, with a typical settling time of 100 ns and a maximum output current of ±18V, which can be used for measurement, control and other applications

The LM2747 is a high-precision synchronous buck controller that provides simple step-down conversion with output voltages as low as 0.6V. The device features an adjustable fixed-frequency voltage-mode PWM control architecture, with frequency adjustable from 50kHz to 1MHz with one external resistor. In addition, the LM2747 also allows the switching frequency to be synchronized to an external clock signal in the range of 250kHz to 1MHz. This wide range of switching frequency provides the power supply designer the flexibility to make better tradeoffs between component size, cost, and efficiency. Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used for providing power-down.

LM124/LM224/LM324/LM2902 is a low power quad operational amplifier, used for single power supply, with high gain, internal frequency compensation and temperature compensation.