The AD567 is a complete high speed 12-bit monolithDigital-to-analog convertersA high stability embedded Zener reference and a double-buffered input latch are included. The converter uses 12 precision, high-speed, bipolar current guide switches and a laser-trimmed thin-film resistor network to provide fast settling time and high accuracy.
Microprocessor compatibility is achieved through on-chip double-buffered latches. Input latches can interface directly with 4-, 8-, 12-, or 16-bit buses. Therefore, the 12 bits of data from the first-level latch can be transferred to the second-level latch to avoid spurious analog output values. The latch can respond to short strobe pulses of 100 ns, allowing it to be used with the fastest microprocessors available.
The versatility and high performance of the AD567 is the result of an advanced switching design, high speed bipolar manufacturing processes, and proven laser wafer trimming (LWT). The device is trimmed at the wafer stage with a maximum linearity error of ±1/4 LSB (K-grade) at 25°C and ±1/2 LSB over the entire operating temperature range.
The chip's undersurface (embedded) Zener diode provides a low noise reference with long-term stability and temperature drift characteristics comparable to the best discrete reference diodes. The laser trimming process provides excellent linearity while also adjusting the absolute value of the reference and its temperature coefficient. As a result, the AD567 has wide temperature range performance with a maximum linearity error of ±1/2 LSB, and monotonicity is guaranteed over temperature. The full-scale gain temperature coefficient is typically 10 ppm/°C.
The AD567 is available in three grades of performance. The AD567J and AD567K are specified for operation from 0°C to +70°C and are available in a 28-lead hermetic ceramic DIP or a 28-lead injection molded DIP package (N package). The AD567S is specified over the –55°C to +125°C temperature range and is available in a ceramic package.