DAC850T
The Tektronix DAC850T is an 8-bit, 50 MHz digital-to-analog converter.
The digital input uses TTL logic levels and high impedance. The digital input goes directly into a MC10124 TTL-to-ECL translator.
The voltage output has a 75 Ω controlled impedance.
The DAC IC used in the DAC850E is the 155-0169-00.