The TLC7226 consists of four 8-bit voltage-output digital-to-analog converters (DACs) with output buffer amplifiers and interface logic on a single monolithic chip. No external trimming is required to achieve full specified performance for the device.
Separate on-chip latches are provided for each of the four DACs. Data is transferred into one of these data latches through a common parallel 8-bit TTL/CMOS-compatible
(5 V) input port. Control inputs A0 and A1 determine which DAC is loaded when WR goes low (see diagram above). The control logic is speed compatible with most 8-bit microcontrollers, eliminating the need for external buffering. Since all four DACs are fabricated on the same chip, precise matching and tracking between them is inherent.
Each DAC includes an output buffer amplifier capable of sourcing up to 5 mA of output current.
The TLC7226 performance is specified for input reference voltages from 2 V to 12.5 V with dual supplies. The voltage mode configuration of the DACs allows the TLC7226 to be operated from a single power supply rail at a reference of 10 V.
The TLC7226 is fabricated in a LinBiCMOS™ process that has been specifically developed to allow high-speed digital logic circuits and precision analog circuits to be integrated on the same chip. The TLC7226 has a common 8-bit parallel data bus with individual DAC latches. This provides a versatile control architecture for simple interface to microcontrollers. All latch-enable signals are level triggered.
The TLC7226C combines four DACs, four operational amplifiers,
and interface logic into a 0.3-inch wide, 20 pin small-outline
package (SOIC). This gives a dramatic reduction in board space
requirements and offers increased reliability in systems using
multiple converters. The pinout optimizes board layout and reduces
system noise by arranging the analog input and outputs at one
end of the package and all digital inputs at the other end.
Literature numbers and device names: (Use the keyword search provided in the Semiconductor Technical Documentation page.)
TLC7226 D/S SLAS060A
Vol 15, February, 1996
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