12-Bit Serial Daisy-Chain a CMOS D/A Converter DAC8143 FEATURES FUNCTIONAL BLOCK DIAGRAM Fast, Flexible, Microprocessor Interfacing in Serially V Controlled Systems DD Buffered Digital Output Pin for Daisy-Chaining R FB Multiple DACs DAC8143 Minimizes Address-Decoding in Multiple DAC I SystemsThree-Wire Interface for Any Number of DACs OUT1 12-BIT V REF One Data Line D/A CONVERTER I OUT2 One CLK Line CLR One Load Line AGND Improved Resistance to ESD LD 1 408C to +858C for the Extended Industrial Temperature DAC REGISTER LOAD Range LD 2 STB 1 APPLICATIONS STB 4 Multiple-Channel Data Acquisition Systems CLK STB Process Control and Industrial Automation 3 INPUT 12-BIT STB Test Equipment 2 SHIFT REGISTER Remote Microprocessor-Controlled Systems SRI IN OUT SRO GENERAL INFORMATION DGND The DAC8143 is a 12-bit serial-input daisy-chain CMOS D/A converter that features serial data input and buffered serial data output. It was designed for multiple serial DAC systems, where serially daisy-chaining one DAC after another is greatly simplified. ADDRESS BUS The DAC8143 also minimizes address decoding lines enabling simpler logic interfacing. It allows three-wire interface for any number of DACs: one data line, one CLK line and one load line. ADDRESS WR DECODER Serial data in the input register (MSB first) is sequentially clocked out to the SRO pin as the new data word (MSB first) is simultaneously clocked in from the SRI pin. The strobe inputs STROBE DB SRI are used to clock in/out data on the rising or falling (user X DAC8143 SRO selected) strobe edges (STB , STB , STB3, STB ). LOAD 1 2 4 When the shift registers data has been updated, the new data mP word is transferred to the DAC register with use of LD1 and STROBE SRI LD2 inputs. DAC8143 SRO LOAD Separate LOAD control inputs allow simultaneous output up- dating of multiple DACs. An asynchronous CLEAR input resets the DAC register without altering data in the input STROBE register. SRI DAC8143 SRO LOAD Improved linearity and gain error performance permits reduced circuit parts count through the elimination of trimming compo- nents. Fast interface timing reduces timing design considerations while minimizing microprocessor wait states. STROBE SRI The DAC8143 is available in plastic packages that are compat- DAC8143 SRO LOAD ible with autoinsertion equipment. Plastic packaged devices come in the extended industrial tem- perature range of 40 C to +85 C. Figure 1. Multiple DAC8143s with Three-Wire Interface REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. 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 Tel: 781/329-4700 World Wide Web Site: DAC8143SPECIFICATIONS ( V = +5 V V = +10 V V = V = V = V = 0 V T = Full Temperature DD REF OUT1 OUT2 AGND DGND A ELECTRICAL CHARACTERISTICS Range specified under Absolute Maximum Ratings, unless otherwise noted.) Parameter Symbol Conditions Min Typ Max Units STATIC ACCURACY Resolution N 12 Bits Nonlinearity INL 1 LSB 1 Differential Nonlinearity DNL 1 LSB 2 Gain Error G 2 LSB FSE 3 Gain Tempco (D Gain/D Temp) TC 5 ppm/ C GFS Power Supply Rejection Ratio (D Gain/D V ) PSRR D V = 5% 0.0006 0.002 %/% DD DD 4 Output Leakage Current I T = +25 C 5nA LKG A T = Full Temperature Range 25 nA A 5, 6 Zero Scale Error I T = +25 C 0.002 0.03 LSB ZSE A T = Full Temperature Range 0.01 0.15 LSB A 7 Input Resistance R V Pin 7 11 15 kW IN REF AC PERFORMANCE 3, 8 Output Current Settling Time t 0.380 1 m s S AC Feedthrough Error 3, 9 (V to I ) FT V = 20 V p-p f = 10 kHz, T = +25 C 2.0 mV p-p REF OUT1 REF A 3, 10 Digital-to-Analog Glitch Energy QV = 0 V, I Load = 100 W , C = 13 pF 20 nVs REF OUT EXT 3 Total Harmonic Distortion THD V = 6 V rms 1 kHz REF DAC Register Loaded with All 1s 92 dB 3, 11 Output Noise Voltage Density e 10 Hz to 100 kHz Between R and I 13 nV/ Hz n FB OUT DIGITAL INPUTS/OUTPUT Digital Input HIGH V 2.4 V IH Digital Input LOW V 0.8 V IL 12 Input Leakage Current I V = 0 V to +5 V 1 m A IN IN Input Capacitance C V = 0 V 8 pF IN IN Digital Output High V I = 200 mA4 V OH OH Digital Output Low V I = 1.6 mA 0.4 V OL OL ANALOG OUTPUTS 3 Output Capacitance C Digital Inputs = All 1s 90 pF OUT1 C Digital Inputs = All 0s 90 pF OUT2 3 Output Capacitance C Digital Inputs = All 0s 60 pF OUT1 C Digital Inputs = All 1s 60 pF OUT2 3 TIMING CHARACTERISTICS Serial Input to Strobe Setup Times t STB Used as the Strobe 50 ns DS1 1 (t = 80 ns) t STB Used as the Strobe 20 ns STB DS2 2 t STB Used as the Strobe T = +25 C10 ns DS3 3 A T = Full Temperature Range 20 ns A t STB Used as the Strobe 20 ns DS4 4 t STB Used as the Strobe T = +25 C40 ns DH1 1 A T = Full Temperature Range 50 ns A t STB Used as the Strobe T = +25 C50 ns DH2 2 A T = Full Temperature Range 60 ns A Serial Input to Strobe Hold Times (t = 80 ns) t STB Used as the Strobe 80 ns STB DH3 3 t STB Used as the Strobe 80 ns DH4 4 2 REV. C