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GENERAL DESCRIPTION
The AD7533KR is a low cost, 10-bit, 4-quadrant multiplying DAC manufactured using an advanced thin-film-on-monolithicCMOS wafer fabrication process. Pin and function equivalent to the AD7533KR industry standard, the AD7533KR is recommended as a lower cost alternative for old AD7533KR sockets or new 10-bit DAC designs.
AD7533KR application flexibility is demonstrated by its ability to interface to TTL or CMOS, operate on 5 V to 15 V power, and provide proper binary scaling for reference inputs of either positive or negative polarity.
FEATURES
1. Low cost 10-bit DAC
2. Low cost AD7520 replacement
3. Linearity: ½ LSB, 1 LSB, or 2 LSB
4. Low power dissipation
5. Full 4-quadrant multiplying DAC
6. CMOS/TTL direct interface
7. Latch free (protection Schottky not required)
8. Endpoint linearity
APPLICATIONS
1. Digitally controlled attenuators
2. Programmable gain amplifiers
3. Function generation
4. Linear automatic gain controls
GENERAL CIRCUIT INFORMATION
The AD7533KR is a 10-bit multiplying DAC that consists of a highly stable thin-film R-2R ladder and ten CMOS current switches on a monolithic chip. Most applications require the addition of only an output operational amplifier and a voltage or current reference.
The simplified D/A circuit is shown in Figure 7. An inverted R- 2R ladder structure is used, that is, the binarily weighted currents are switched between the IOUT1 and IOUT2 bus lines, thus maintaining a constant current in each ladder leg independent of the switch state.
FUNCTIONAL BLOCK DIAGRAM
