CMOS Dual 8-Bit Buffered Multiplying DAC AD7528
FEATURES On-Chip Latches for Both DACs +5 V to +15 V Operation DACs Matched to 1% Four Quadrant Multiplication TTL/CMOS Compatible Latch Free (Protection Schottkys not Required)
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS Digital Control of: Gain/Attenuation Filter Parameters Stereo Audio Circuits X-Y Graphics
The AD7528 is a monolithic dual 8-bit digital/analog converter featuring excellent DAC-to-DAC matching. It is available in skinny 0.3" wide 20-pin DIPs and in 20-terminal surface mount packages. Separate on-chip latches are provided for each DAC to allow easy microprocessor interface. Data is transferred into either of the two DAC data latches via a common 8-bit TTL/CMOS compatible input port. Control input DAC A/DAC B determines which DAC is to be loaded. The AD7528’s load cycle is similar to the write cycle of a random access memory and the device is bus compatible with most 8-bit microprocessors, including 6800, 8080, 8085, Z80. The device operates from a +5 V to +15 V power supply, dissipating only 20 mW of power. Both DACs offer excellent four quadrant multiplication characteristics with a separate reference input and feedback resistor for each DAC.
Relative Gain Accuracy Error
AD7528JN AD7528KN AD7528LN AD7528JP AD7528KP AD7528LP AD7528JR AD7528KR AD7528LR AD7528AQ AD7528BQ AD7528CQ AD7528SQ AD7528TQ AD7528UQ AD7528SE AD7528TE AD7528UE
–40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –55°C to +125°C –55°C to +125°C –55°C to +125°C –55°C to +125°C –55°C to +125°C –55°C to +125°C
± 1 LSB ± 1/2 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1/2 LSB
N-20 N-20 P-20A P-20A R-20 R-20 Q-20 Q-20 Q-20 E-20A E-20A
± 4 LSB ± 2 LSB ± 1 LSB ± 4 LSB ± 2 LSB ± 1 LSB ± 4 LSB ± 2 LSB ± 1 LSB ± 4 LSB ± 2 LSB ± 1 LSB ± 4 LSB ± 2 LSB ± 1 LSB ± 4 LSB ± 2 LSB ± 1 LSB
1. DAC to DAC matching: since both of the AD7528 DACs are fabricated at the same time on the same chip, precise matching and tracking between DAC A and DAC B is inherent. The AD7528’s matched CMOS DACs make a whole new range of applications circuits possible, particularly in the audio, graphics and process control areas.
NOTES 1 Analog Devices reserves the right to ship side-brazed ceramic in lieu of cerdip. Parts will be marked with cerdip designator “Q.” 2 Processing to MIL-STD-883C, Class B is available. To order, add suffix “/883B” to part number. For further information, see Analog Devices’ 1990 Military Products Databook. 3 E = Leadless Ceramic Chip Carrier; N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip; R = SOIC.
2. Small package size: combining the inputs to the on-chip DAC latches into a common data bus and adding a DAC A/DAC B select line has allowed the AD7528 to be packaged in either a small 20-pin DIP, SOIC, PLCC or LCCC. REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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