Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference DAC8426
offering a 25 ppm/�C temperature coefficient and mA of external load driving capability. The DAC8426 contains four 8-bit voltage-output CMOS D/A converters on a single chip. 10 V output bandgap reference sets the output full-scale voltage. The circuit also includes four input latches and interface control logic. One of the four latches, selected by the address inputs, is loaded from the 8-bit data bus input when the write strobe is active low. All digital inputs are TTL/CMOS (5 V) compatible. The on-board amplifiers can drive 10 mA from either a single or dual supply. The on-board reference that is always connected to the internal DACs has 5 mA available to drive external devices. Its compact size, low power, and economical cost-per-channel, make the DAC8426 attractive for applications requiring multiple D/A converters without sacrificing circuit-board space. System reliability is also increased due to reduced parts count. PMI's advanced oxide-based, silicon-gate, CMOS process allows the DAC8426's analog and digital circuitry to be manufactured on the same chip. This, coupled with PMI's highly stable thin-film R-2R resistor ladder, aids in matching and temperature tracking between DACs.
FEATURES No Adjustments Required, Total Error 1 LSB Max Over Temperature Four Voltage-Output DACs on a Single Chip Internal 10 V Bandgap Reference Operates from Single 15 V Supply Fast 50 ns Data Load Time, All Temperatures Pin-for-Pin Replacement for PM-7226 and AD7226, Eliminates External Reference APPLICATIONS Process Controls Multichannel Microprocessor Controlled: System Calibration Op Amp Offset and Gain Adjust Level and Threshold Setting
The is a complete quad voltage output D/A converter with internal reference. This product fits directly into any existing 7226 socket where the user currently has 10 V external reference. The external reference is no longer necessary. The internal reference of the DAC8426 is laser-trimmed � 0.4%
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(VDD V 10%, AGND = DGND 0 V, VSS to +125C applies for to +85C applies for DAC8426ER/EP/FR/FP/FS, unless otherwise noted.)
Parameter STATIC PERFORMANCE Resolution Total Unadjusted Error1 Relative Accuracy Differential Nonlinearity2 Full-Scale Temperature Coefficient Zero Scale Error Zero Scale Error Temperature Coefficient REFERENCE OUTPUT Output Voltage Temperature Coefficient Load Regulation Line Regulation Output Noise3 Output Current DIGITAL INPUTS Logic Input "0" Logic Input "1" Input Current Input Capacitance3 POWER SUPPLIES Positive Supply Current4 Negative Supply Current 4 Power Dissipation5 Power Supply Sensitivity Symbol N TUE INL DNL TCGFS VZSE TCVZS VREFOUT TCVREFOUT LDREG LNREG en rms IREFOUT VINL VINH IIN CIN IDD ISS PDISS PSS Conditions Min 8 Includes Reference 25 20 Dual Supply No Load 5 mA VDD 10 Hz VREFOUT 40 mV VSS B, F Typ Max Units Bits LSB ppm/�C mV �V/�C V ppm/�C %/mA %/V �V p-p mA mW
Parameter DAC OUTPUT Output Current (Source)3 Output Current (Sink) 3 Minimum Load Resistance DYNAMIC PERFORMANCE 3 VOUT Slew Rate VOUT Settling Time (Positive or Negative) Digital Crosstalk SWITCHING CHARACTERISTICS Address To Write Setup Time Address To Write Hold Time Data Valid To Write Setup Time Data Valid To Write Hold Time Write Pulse Width
VDD V 10%, AGND = DGND 0 V, VSS to +125C applies for to +85C applies for DAC8426ER/EP/FR/FP/FS, unless otherwise noted.
Symbol IOUTSOURCE IOUTSINK RL(MIN) tS Q tAS tAH tDS tDH tWR Conditions Digital In = All Ones Digital In = All Zeroes �5 V Digital In = All Ones Min 2 Typ6 Max Units �A k V/�s �s nVs ns
NOTES 1 Includes Full-Scale Error, Relative Accuracy, and Zero Code Error. Note � 1 LSB � 0.39% error. 2 All devices guaranteed monotonic over the full operating temperature range. 3 Guaranteed and not subject to production test. 4 Digital inputs IN = VINL or VINH; VOUT and VREFOUT unloaded. 5 PDISS calculated by IDD � VDD. 6 Typicals represent measured characteristics = +25�C. Specifications subject to change without notice.
VDD to AGND or DGND. +17 V VSS to AGND or DGND. �7 V, VDD to VSS. +24 V AGND to DGND. +5 V Digital Input Voltage to DGND. �0.3 V, VDD VREFOUT �0.3 V, VDD VOUT to AGND1. VSS, VDD Operating Temperature Military AR/BR. to +125�C Extended Industrial ER/EP/FR/FP/FS. to +85�C Maximum Junction Temperature. +150�C Storage Temperature. to +150�C Lead Temperature (Soldering, 60 sec). +300�C
1. Do not apply voltages higher than VDD or less than VSS potential on any terminal. 2. The digital control inputs are zener-protected; however, permanent damage may occur on unprotected units from high-energy electrostatic fields. Keep units in conductive foam at all times until ready to use. 3. Do not insert this device into powered sockets. Remove power before insertion or removal. 4. Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to device.
NOTES 1 Outputs may be shorted to any terminal provided the package power dissipation is not exceeded. Typical output short-circuit current to AGND is 50 mA. JA is specified for worst case mounting conditions, i.e., JA is specified for device in socket for cerdip and P-DIP packages; JA is specified for device soldered to printed circuit board for SOL package.
Package Description 20-Pin Cerdip (Q-20) 20-Pin Cerdip (Q-20) 20-Pin Plastic DIP (N-20) 20-Pin Cerdip (Q-20) 20-Pin Cerdip (Q-20) 20-Pin Plastic DIP (N-20) 20-Lead SOL (R-20)
NOTES 1 Burn-in is available on commercial and industrial temperature range parts in cerdip, plastic DIP, and TO-can packages. 2 For devices processed in total compliance to MIL-STD-883, add /883 after part number. Consult factory for 883 data sheet. 3 For availability and burn-in information on SO and PLCC packages, contact your local sales office.
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