MX7837/MX7847 19-0158 Rev 0 7/93 Complete, Dual, 12-Bit Multiplying DACs General Description Features The MX7837/MX7847 are dual, 12-bit, multiplying, volt- Two 12-Bit Multiplying DACs with Buffered age-output digital-to-analog converters (DACs). Each Voltage Output DAC has an output amplifier and a feedback resistor. Specified with 12V or 15V Supplies The output amplifier is capable of developing 10V across a 2k load. The amplifier feedback resistor is No External Adjustments Required internally connected to V on the MX7847. No exter- OUT Fast Timing Specifications nal trims are required to achieve full 12-bit performance over the entire operating temperature range. 24-Pin DIP and SO Packages The MX7847 has a 12-bit parallel data input, whereas 12-Bit Parallel Interface (MX7847) the MX7837 operates with a double-buffered 8-bit-bus 8-Bit + 4-Bit Interface (MX7837) interface that loads data in two write operations. All logic signals are level triggered and are TTL and CMOS Ordering Information compatible. Fast timing specifications make these DACs compatible with most microprocessors. ERROR PART TEMP. RANGE PIN-PACKAGE (LSB) Applications MX7837JN 0C to +70C 24 Narrow Plastic DIP 1 Small Component-Count Analog Systems MX7837KN 0C to +70C 24 Narrow Plastic DIP 1/2 Digital Offset/Gain Adjustments MX7837JR 0C to +70C 24 Wide SO 1 MX7837KR 0C to +70C 24 Wide SO 1/2 Industrial Process Control MX7837C/D 0C to +70C Dice* 1 Function Generators Ordering Information continued on last page. Automatic Test Equipment * Contact factory for availability and processing to MIL-STD-883. Automatic Calibration Typical Operating Circuits Machine and Motion Control Systems V DD Waveform Reconstruction Synchro Applications MSB LSB Pin Configurations INPUT INPUT LATCH LATCH 4 8 DAC LATCH A TOP VIEW R FBA CS 12 1 24 DB0/DB8 R DB1/DB9 V 2 23 REFA V FBA DAC A OUTA V REFB DB2/DB10 V 3 22 REFA AGNDA V 4 21 DB3/DB11 OUTA DB4 AGNDA 5 20 R FBB DB0 MX7837 V DD DB5 6 19 DB7 DAC B V OUTB V 7 18 DB6 SS 12 AGNDB DB7 8 17 DAC LATCH B LDAC AGNDB V 9 16 OUTB A0 8 4 CS LSB CONTROL MSB V 10 15 A1 WR REFB INPUT INPUT LOGIC MX7837 LATCH LATCH A0 DGND 11 14 LDAC A1 R WR FBB 12 13 DGND V SS DIP/SO MX7847 on last page. MX7847 on last page. Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature.Complete, Dual, 12-Bit Multiplying DACs ABSOLUTE MAXIMUM RATINGS V to DGND, AGNDA, AGNDB ............................-0.3V to +17V Operating Temperature Ranges: DD V to DGND, AGNDA, AGNDB (Note 1) ..............+0.3V to -17V MX78 7J /K ........................................................0C to +70C SS V , V to AGNDA, AGNDB .. (V - 0.3V) to (V + 0.3V) MX78 7A /B .................................................. -40C to +85C REFA REFB SS DD AGNDA, AGNDB to DGND.........................-0.3V to (V + 0.3V) MX78 7SQ/TQ ............................................... -55C to +125C DD V , V to AGNDA, AGNDB .....(V - 0.3V) to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C OUTA OUTB SS DD R , R to AGNDA, AGNDB .......(V - 0.3V) to (V + 0.3V) Lead Temperature (soldering, 10sec) .............................+300C FBA FBB SS DD Digital Inputs to DGND ...............................-0.3V to (V + 0.3V) DD Continuous Power Dissipation (T = +70C) A Narrow Plastic DIP (derate 13.33mW/C above +70C)....1067mW SO (derate 11.76mW/C above +70C).........................941mW Narrow CERDIP (derate 12.50mW/C above +70C) ..1000mW Note 1: If V is open-circuited with V and either AGND applied, the V pin will float positive exceeding the Absolute Maximum Ratings. SS DD SS If this possibility exists, a Schottky diode connected between V and GND ensures the maximum ratings will be observed. SS Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 11.4V to 16.5V, V = -11.4V to -16.5V, AGNDA = AGNDB = DGND = 0V, V = V = +10V, R = 2k, C = 100pF, DD SS REFA REFB L L V connected to R (MX7837), T = T to T , unless otherwise noted.) (Note 2) OUT FB A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS STATIC PERFORMANCE (Note 3) Resolution N 12 Bits MX78 7J/A/S 1 Relative Accuracy INL LSB MX78 7K/B/T 1/2 Differential Nonlinearity DNL Guaranteed monotonic 1 LSB T = +25C 2 A Loaded with all 0s, MX78 7J/A 4 Zero-Code Offset Error tempco = mV T = T to T MX78 7K/B 3 A MIN MAX 5V/C typ MX78 7S/T 5 MX78 7J/A/S 5 T = +25C A Loaded with all 1s, MX78 7K/B/T 2 Gain Error tempco = 2ppm LSB MX78 7J/A/S 7 of FSR/C typ T = T to T A MIN MAX MX78 7K/B/T 4 REFERENCE INPUTS V Input Resistance 810 13 k REF V , V Resistance REFA REFB 0.5 3 % Matching DIGITAL INPUTS Input High Voltage V 2.4 INH V Input Low Voltage V 0.8 INL Input Current Digital inputs at 0V and V 1 A DD Input Capacitance (Note 4) 8 pF ANALOG OUTPUTS DC Output Impedance 0.2 Short-Circuit Current V connected to AGND 15 mA OUT 2 MX7837/MX7847