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FEATURES Improved Version of AD7541 Full Four-Quadrant Multiplication 12-Bit Linearity (Endpoint) All Parts Guaranteed Monotonic TTL/CMOS Compatible Low Cost Protection Schottky Diodes Not Required Low Logic Input Leakage CMOS 12-Bit Monolithic Multiplying DAC AD7541A
FUNCTIONAL BLOCK DIAGRAM
10k VREF 20k S1 20k S2 20k S3 20k S12 20k 10k 10k OUT2 OUT1 10k RFEEDBACK GENERAL DESCRIPTION The Analog Devices AD7541A is a low cost, high performance 12-bit monolithic multiplying digital-to-analog converter. It is fabricated using advanced, low noise, thin film on CMOS technology and is available in a standard 18-lead DIP and in 20-terminal surface mount packages. The AD7541A is functionally and pin compatible with the industry standard AD7541 device and offers improved specifications and performance. The improved design ensures that the device is latch-up free so no output protection Schottky diodes are required. This new device uses laser wafer trimming to provide full 12-bit endpoint linearity with several new high performance grades.
ORDERING GUIDE 1
Temperature Range 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C 25°C to +85°C 25°C to +85°C 55°C to +125°C 55°C to +125°C 55°C to +125°C 55°C to +125°C Relative Gain Accuracy Error TMIN to T MAX TA = +25 C ± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 1 LSB ± 1/2 LSB ± 6 LSB ± 1 LSB ±6 ±1 ±1 ± 6 LSB ± 1 LSB ± 6 LSB ± 1 LSB ± 6 LSB ± 1 LSB Package Options3 N-18 N-18 P-20A P-20A R-18 Q-18 Q-18 Q-18 Q-18 E-20A E-20A BIT 1 (MSB) BIT 2 BIT 3 BIT 12 (LSB) DIGITAL INPUTS (DTL/TTL/CMOS COMPATIBLE) LOGIC: A SWITCH IS CLOSED TO IOUT1 FOR ITS DIGITAL INPUT IN A "HIGH" STATE. PRODUCT HIGHLIGHTS Compatibility: The AD7541A can be used as a direct replacement for any AD7541-type device. As with the Analog Devices AD7541, the digital inputs are TTL/CMOS compatible and have been designed to have a ± 1 µA maximum input current requirement so as not to load the driving circuitry. Improvements: The AD7541A offers the following improved specifications over the AD7541: 1. Gain Error for all grades has been reduced with premium grade versions having a maximum gain error of ± 3 LSB. 2. Gain Error temperature coefficient has been reduced to 2 ppm/°C typical and 5 ppm/°C maximum. 3. Digital-to-analog charge injection energy for this new device is typically 20% less than the standard AD7541 part. 4. Latch-up proof. 5. Improvements in laser wafer trimming provides 1/2 LSB max differential nonlinearity for top grade devices over the operating temperature range (vs. 1 LSB on ol …
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