Analog Devices

The AD75004 contains four complete, voltage output, 12-bit digital to analog converters, a high stability bandgap reference, and double-buffered input latches on a single chip. The converters use 12 precision high speed bipolar current sterring switches and laser-trimmed thin-film resistor networks to provide fast settling time and high accuracy.Microprocessor compatibility is achieved by the on-chip double-buffered latches. The design of the input latches allows direct interface to 8-bit buses. The 12 bits of data from the first rank of latches can then be transferred to the second rank, avoiding generation of spurious analog output values. The latch responds to strobe pulses as short as 50 ns, allowing use with fast microprocessors.The functional completeness and high performance of the AD75004 results from a combination of advanced switch design, the BiMOS II fabrication process, and proven laser trimming technology. BiMOS II is an expatial BiCMOS process optimized for analog and converter functions. The AD75004 is trimmed at the wafer level and is specified to ± ½ LSB maximum linearity error at 25ºC and ± ¾ LSB over the full operating temperature range. The on-chip output amplifiers provide an output range of ±5 V, with 1 LSB equal to 2.44 mV.The bandgap reference on the chip has low noise, long term stability and temperature drift characteristics comparable to discrete reference diodes. The absolute value of the reference is laser trimmed to +5.00 V with 0.6% maximum error. It's temperature coefficient is also laser trimmed.Typical full-scale gain TC is 15 ppm/ºC. With guaranteed monotonicity over the full temperature range, the AD75004 is well suited for wid temperature range performance.

The AD75019 contains 256 analog switches in a 16 × 16 array. Any of the X or Y pins may serve as an input or output. Any or all of the X terminals may be programmed to connect to any or all of the Y terminals. The switches can accommodate signals with amplitudes up to the supply rails and have a typical on-resistance of 150 Ω.Data is loaded serially via the SIN input and clocked into an on-board 256-bit shift register via SCLK. When all the switch settings have been programmed, data is transferred into a set of 256 latches via PCLK. The serial shift register is dynamic, so there is a minimum clock rate of 20 kHz. The maximum clock rate of 5 MHz allows loading times as short as 52 μs. The switch control latches are static and will hold their data as long as power is applied.To extend the number of switches in the array, you may cascade multiple AD75019s. The SOUT output is the end of the shift register, and may be connected to the SIN input of the next AD75019.The AD75019 is fabricated in Analog Devices’ BiMOS II process. This epitaxial BiCMOS process features CMOS devices for low distortion switches and bipolar devices for ESD protection.

The AD7510DI, AD7511DI and AD7512DI are a family of latch proof dielectrically isolated CMOS switches featuring over-voltage protection up to ± 25V above the power supplies. These benefits are obtained without sacrificing the low "ON" resistance (75n) or low leakage current (500pA), the main features of an analog switch.The AD7510DI and AD7511DI consist of four independent SPST analog switches packaged in either a 16-pin DIP or a 20- terminal surface mount package. They differ only in that the digital control logic is inverted. The AD7512DI has two independent SPDT switches packaged either in a 14-pin DIP or a 20-terminal surface mount package.Very low power dissipation, overvoltage protection and TTL/CMOS direct interfacing are achieved by combining a unique circuit design and a dielectrically isolated CMOS process. Silicon nitride passivation ensures long term stability while monolithic construction provides reliability.