Bt121

The Bt121 is a triple 8-bit VIDEODAC designed specifically for high-performance, high-resolution color graphics. Bt121 offers a higher level of integration than previous VIDEODAC designs. It includes an on-chip voltage reference to simplify use of the device. There are some features as follows. First is 80, 50 MHz operation. The second is triple 8-bit D/A converters. Then Bt121 is optional internal voltage reference. Next is RS-343A compatible outputs. The fifth is TTL compatible inputs. The sixth is +5 V CMOS monolithic construction. The seventh is 44-pin PLCC package. The last one is typical power dissipation which is 600 mW.

What comes next is about the absolute maximum ratings of Bt121. The maximum VAA (measured to GND) is 7.0 V. The voltage on any signal pin is from GND-0.5 to VAA+0.5 V. The TA (ambient operating temperature range) is from -55 to +125. The TS (storage temperature range) is from -65 to +150. The TJ (junction temperature) is +150. The TVSOL (vapor phase soldering voltage (1 minute)) is 220.

The following is about the recommended operating conditions of Bt121. The minimum VAA (power supply) is 4.75 V, the typical is 5.00 V and the maximum is 5.25 V for 80,66 MHz parts. The minimum VAA (power supply) is 4.5 V, the typical is 5.00 V and the maximum is 5.5 V for 50,35 MHz parts. The TA (ambient operating temperature range) is from 0 to +70. The typical RL (output load) is 37.5. The minimum VREF (external reference voltage) is 1.11 V, the typical is 1.235 V and the maximum is 1.36 V. The typical RSET (FS ADJUST resistor) is 143.