CMOS 12-Bit Monolithic Multiplying DAC AD7541A
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
FUNCTIONAL BLOCK DIAGRAM 10kΩ
VREF 20kΩ S1
OUT2 OUT1 10kΩ RFEEDBACK
BIT 1 (MSB)
BIT 12 (LSB)
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.
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.
This new device uses laser wafer trimming to provide full 12-bit endpoint linearity with several new high performance grades.
Improvements: The AD7541A offers the following improved specifications over the AD7541:
DIGITAL INPUTS (DTL/TTL/CMOS COMPATIBLE) LOGIC: A SWITCH IS CLOSED TO IOUT1 FOR ITS DIGITAL INPUT IN A "HIGH" STATE.
1. Gain Error for all grades has been reduced with premium grade versions having a maximum gain error of ± 3 LSB.
ORDERING GUIDE 1
Relative Gain Accuracy Error TMIN to T MAX TA = +25؇C
AD7541AJN AD7541AKN AD7541AJP AD7541AKP AD7541AKR AD7541AAQ AD7541ABQ AD7541ASQ AD7541ATQ AD7541ASE AD7541ATE
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
± 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
N-18 N-18 P-20A P-20A R-18 Q-18 Q-18 E-20A E-20A
± 6 LSB ± 1 LSB ±6 ±1 ±1 ± 6 LSB ± 1 LSB ± 6 LSB ± 1 LSB ± 6 LSB ± 1 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 older 7541 types). 6. All grades are guaranteed monotonic to 12 bits over the operating temperature range.
NOTES 1 Analog Devices reserves the right to ship either ceramic (D-18) or cerdip (Q-18) hermetic packages. 2 To order MIL-STD-883, Class B process parts, add /883B to part number. Contact local sales office for military data sheet. 3 E = Leadless Ceramic Chip Carrier; N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip; R = Small Outline IC.
REV. B 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997
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