DAC8222BTC/883 AD [Analog Devices], DAC8222BTC/883 Datasheet

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DAC8222BTC/883

Manufacturer Part Number
DAC8222BTC/883
Description
Dual 12-Bit Double-Buffered Multiplying CMOS D/A Converter
Manufacturer
AD [Analog Devices]
Datasheet
a
GENERAL DESCRIPTION
The DAC8222 is a dual 12-bit, double-buffered, CMOS digital-
to-analog converter. It has a 12-bit wide data port that allows a
12-bit word to be loaded directly. This achieves faster through-
put time in stand-alone systems or when interfacing to a 16-bit
processor. A common 12-bit input TTL/CMOS compatible
data port is used to load the 12-bit word into either of the two
DACs. This port, whose data loading is similar to that of a RAM’s
write cycle, interfaces directly with most 12-bit and 16-bit bus
systems. (See DAC8248 for a complete 8-bit data bus interface
product.) A common bus allows the DAC8222 to be packaged
in a narrow 24-lead 0.3" DIP and save PCB space.
The DAC is controlled with two signals, WR and LDAC. With
logic low at these inputs, the DAC registers become transparent.
This allows direct unbuffered data to flow directly to either
DAC output selected by DAC A/DAC B. Also, the DAC’s
Multiplying CMOS D/A Converter
double-buffered digital inputs will allow both DACs to be
simultaneously updated.
DAC8222’s monolithic construction offers excellent DAC-to-
DAC matching and tracking over the full operating tempera-
ture range. The chip consists of two thin-film R-2R resistor
ladder networks, four 12-bit registers, and DAC control logic
circuitry. The device has separate reference-input and feedback
resistors for each DAC and operates on a single supply from
+5 V to +15 V. Maximum power dissipation at +5 V using
zero or V
The DAC8222 is manufactured with highly stable thin-film re-
sistors on an advanced oxide-isolated, silicon-gate, CMOS
technology. Improved latch-up resistant design eliminates the
need for external protective Schottky diodes.
Dual 12-Bit Double-Buffered
DD
logic levels is less than 0.5 mW.
FUNCTIONAL DIAGRAM
DAC8222

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DAC8222BTC/883 Summary of contents

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GENERAL DESCRIPTION The DAC8222 is a dual 12-bit, double-buffered, CMOS digital- to-analog converter. It has a 12-bit wide data port that allows a 12-bit word to be loaded directly. This achieves faster through- put time in stand-alone systems or ...

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DAC8222–SPECIFICATIONS ELECTRICAL CHARACTERISTICS T = Full Temperature Range Specified in Absolute Maximum Ratings; unless otherwise noted. Specifications apply for DAC A and DAC B.) A Parameter Symbol Conditions STATIC ACCURACY Resolution N Relative Accuracy INL Differential Nonlinearity DNL 1 Full-Scale ...

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... Devices can suffer permanent damage and/or reliability deg- radation if stressed above the limits listed under Absolute Maximum Ratings for extended periods. Model DAC8222EW DAC8222GP DAC8222BTC/883* DAC8222FW DAC8222FP DAC8222FS *Consult factory for DAC8222/883 MIL-STD data sheet. CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...

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DAC8222 DICE CHARACTERISTICS × × WAFER TEST LIMITS (@ + Parameter Symbol Relative Accuracy INL Differential Nonlinearity DNL 1 Full Scale Gain Error G FSE Output Leakage ( ...

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TYPICAL PERFORMANCE CHARACTERISTICS ° ° ° DAC8222 ...

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DAC8222 TYPICAL PERFORMANCE CHARACTERISTICS ...

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PARAMETER DEFINITIONS RESOLUTION (n) The resolution of a DAC is the number of states (2 the full-scale range (FSR) is divided (or resolved); where n is equal to the number of bits. RELATIVE ACCURACY (INL) Relative accuracy, or integral nonlinearity, ...

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DAC8222 between I and AGND terminals be as close to zero as practi- OUT cal in order to keep DAC errors to a minimum. This is normally done by connecting AGND to the noninverting input amp and ...

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Digital Inputs DAC A/B WR LDAC Low High Don’t Care INTERFACE CONTROL LOGIC DAC A/DAC B ...

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DAC8222 APPLICATIONS INFORMATION UNIPOLAR OPERATION Figure 24 shows a simple unipolar (2-quadrant multiplication) circuit using the DAC8222 and OP270 dual op amp (use two OP42s for higher speeds), and Table II the corresponding code table. Resistors R1, R2, and R3, ...

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Table III. Bipolar (Offset Binary) Code Table (Refer to Figure 25) Binary Number in DAC Register Analog Output, V (DAC A or DAC B) MSB LSB 1111 1111 1111 +V REF 1000 0000 0001 +V REF 1000 0000 0000 0 ...

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DAC8222 SINGLE SUPPLY OPERATION CURRENT STEERING MODE Because the DAC8222’s R-2R resistor ladder terminating resis- tor is internally connected to AGND, it lends itself well to single supply operation in the current steering mode. This means that AGND can be ...

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BASIC APPLICATIONS PROGRAMMING WINDOW DETECTOR Figure 28 shows the DAC8222 used in a programmable window detector configuration. The required upper and lower limits for the test are loaded into DAC A and DAC signal at the test ...

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DAC8222 ...

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Cerdip (Q-24) 0.005 (0.13) MIN 0.098 (2.49) MAX 24 13 0.310 (7.87) 0.220 (5.59 PIN 1 0.060 (1.52) 1.280 (32.51) MAX 0.015 (0.38) 0.200 (5.08) MAX 0.200 (5.08) 0.125 (3.18) 0.023 (0.58) 0.100 (2.54) 0.070 (1.78) BSC ...

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