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| LTC7541A Improved Industry Standard CMOS 12-Bit Multiplying DAC FEATURES s s s DESCRIPTION The LTC(R) 7541A is a 12-bit resolution multiplying digitalto-analog converter (DAC). Laser-trimmed thin-film resistors provide excellent absolute accuracy. Precision matched resistors and CMOS circuitry result in remarkable stability with temperature and supply variations. The LTC7541A is a superior pin compatible replacement for the industry standard AD7541A/AD7541. Improvements include better typical accuracy and stability and reduced sensitivity to output amplifier offset. The LTC7541A is also very resistant to latch-up. In addition to 2-quadrant and 4-quadrant multiplying configurations, the LTC7541A performs well in digitally programmable gain and noninverting voltage output applications. Low cost, improved performance and versatility make the LTC7541A the best choice for many new designs and for upgrading existing systems. Parts are available in 18-pin PDIP and 18-pin SO Wide packages. , LTC and LT are registered trademarks of Linear Technology Corporation. s s s s s s s s Improved Direct Replacement for AD7541A and AD7541 4-Quadrant Multiplication 12-Bit End-Point Linearity: 0.5LSB DNL and INL Over Temperature All Grades Guaranteed Monotonic Maximum Gain Error: 1LSB Single 5V to 15V Supply TTL and CMOS Logic Compatible Reduced Sensitivity to Op Amp Offset Low Power Consumption Virtually Latch-Up Proof Low Cost APPLICATIONS s s s s s Motion Control Systems Microprocessor-Controlled Calibration Automatic Test Equipment Programmable Gain Amplifiers Digitally Controlled Filters TYPICAL APPLICATION 2-Quadrant Multiplying DAC Has Less Than 0.5LSB (Typ) Total Unadjusted Error VIN 15V Integral Nonlinearity Over Temperature 1.0 INTEGRAL NONLINEARITY (LSB) 0.1F LTC7541A OUT 2 2 GND 4 TO 15 DIGITAL INPUTS 3 + - 17 16 VDD VREF 18 RFB 1 OUT 1 33pF 0.5 TA = 85C 0 TA = -40C -0.5 TA = 25C LT (R)1097 VOUT 7541 TA01 -1.0 0 512 1024 1536 2048 2560 3072 3584 4095 DIGITAL INPUT CODE 7541A TA02 U U U 1 LTC7541A ABSOLUTE MAXIMUM RATINGS VDD to GND ............................................... - 0.5V to 17V VREF to GND.......................................................... 25V RFB to GND ........................................................... 25V Digital Inputs to GND .................. - 0.5V to (VDD + 0.5V) OUT 1, OUT 2 to GND .................. - 0.5V to (VDD + 0.5V) Power Dissipation ............................................. 450mW (Derate 6mW/C Above 75C) Maximum Junction Temperature ......... - 65C to 125C Operating Temperature Range Commercial (J, K Versions).................. 0C to 70C Industrial (B Version) ...................... - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C PACKAGE/ORDER INFORMATION TOP VIEW OUT 1 OUT 2 GND BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 1 2 3 4 5 6 7 8 9 18 RFB 17 VREF 16 VDD 15 BIT 12 (LSB) 14 BIT 11 13 BIT 10 12 BIT 9 11 BIT 8 10 BIT 7 SW PACKAGE 18-LEAD PLASTIC SO WIDE ORDER PART NUMBER LTC7541ABN LTC7541ABSW LTC7541AJN LTC7541AKN LTC7541AJSW LTC7541AKSW N PACKAGE 18-LEAD PDIP TJMAX = 150C, JA = 100C/ W (N) TJMAX = 150C, JA = 130C/ W (SW) Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS VDD = 15V, VREF = 10V, OUT 1 = OUT 2 = GND = 0V, TA = TMIN to TMAX, unless otherwise specified. SYMBOL PARAMETER Accuracy Resolution INL DNL GE Integral Nonlinearity (Relative Accuracy) Differential Nonlinearity Gain Error Gain Temperature Coefficient ILKG PSRR RREF Output Leakage Current Power Supply Rejection VREF Input Resistance VREF Input Resistance Temperature Coefficient (Note 1) Guaranteed Monotonic, TMIN to TMAX (Note 2) (Note 3) (Note 4) VDD = 15V 5% TA = 25C TMIN to TMAX TA = 25C TMIN to TMAX q q q q q q q CONDITIONS MIN 12 LTC7541AJ TYP MAX LTC7541AK/LTC7541AB MIN TYP MAX 12 UNITS Bits 1 1 6 8 1 5 5 10 0.002 7 11 - 100 15 7 11 - 100 1 0.5 0.5 1 2 5 5 10 0.002 15 ppm/C nA nA %/% k ppm/C Reference Input q 2 U W U U WW W LSB LSB LSB LSB LTC7541A ELECTRICAL CHARACTERISTICS VDD = 15V, VREF = 10V, OUT 1 = OUT 2 = GND = 0V, TA = TMIN to TMAX, unless otherwise specified. SYMBOL PARAMETER Power Supply VDD IDD Operating Supply Range Suppy Current Digital Inputs = VIH or VIL Digital Inputs = 0V or VDD q q q CONDITIONS MIN 5 ALL GRADES TYP MAX 15 16 2 100 UNIT V mA A V Digital Inputs VIH VIL IIN CIN Digital Input High Voltage Digital Input Low Voltage Digital Input Current Digital Input Capacitance Propagation Delay Digital-to-Analog Glitch Impulse Multiplying Feedthrough Error Output Current Settling Time COUT Output Capacitance (Note 3) (Note 3), VIN = 0V (Notes 5, 6) (Notes 5, 7) VREF = 10V, 10kHz Sinewave (Note 5), To 0.01% for Full-Scale Change Digital Inputs = VIH Digital Inputs = VIL The q denotes specifications which apply over the full operating temperature range. Note 1: 0.5LSB = 0.012% of full scale. Note 2: Using internal feedback resistor. Note 3: Guaranteed by design, not subject to test. Note 4: IOUT1 with all digital inputs = 0V or IOUT2 with all digital inputs = VDD. COUT1 COUT2 COUT1 COUT2 q q q q q q q q 2.4 0.8 0.001 1 8 100 1000 1.0 0.6 200 70 70 200 V A pF ns nV-sec mVP-P s pF pF pF pF AC Performance Note 5: OUT 1 load = 100 in parallel with 13pF. Note 6: Measured from digital input change to 90% of final analog value. Digital inputs = 0V to VDD or VDD to 0V. Note 7: VREF = 0V. All digital inputs 0V to VDD or VDD to 0V. Measured using LT1363 as output amplifier. BLOCK DIAGRAM VREF VDD DECODER W 20k 40k 40k 40k 40k 20k 40k 20k RFB 40k 40k 10k OUT 1 OUT 2 TTL/DTL/CMOS COMPATIBLE DIGITAL INPUTS **** GND BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 12 (LSB) 7541 BD Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 3 LTC7541A TYPICAL APPLICATIONS N Unipolar Operation (2-Quadrant Multiplication) VREF - 10 TO 10V 15V 0.1F 16 VDD 17 VREF 18 RFB 1 OUT 1 LTC7541A OUT 2 2 GND 4 TO 15 DIGITAL INPUTS 3 Bipolar Operation (4-Quadrant Multiplication) R2 20k 15V R3 20k VREF - 10 TO 10V 0.1F LTC7541A OUT 2 2 GND 4 TO 15 DIGITAL INPUTS 3 1/2 LT1112 Table 2. Bipolar Offset Binary Code Table DIGITAL INPUT MSB 1111 1000 1000 0111 0000 1111 0000 0000 1111 0000 LSB 1111 0001 0000 1111 0000 ANALOG OUTPUT VOUT VREF (2047/2048) VREF (1/2048) 0V -VREF (1/2048) -VREF RELATED PARTS PART NUMBER LTC1257 LTC1451/LTC1452/LTC1453 LTC7543/LTC8143 LTC8043 DESCRIPTION Complete Serial I/O VOUT 12-Bit DAC Complete Serial I/O VOUT 12-Bit DACs Serial I/O Muliplying 12-Bit DACs Serial Mulitplying 12-Bit DAC COMMENTS 5V to 15V Single Supply in 8-Pin SO and PDIP 3V/5V Single Supply in 8-Pin SO and PDIP Clear Pin, Serial Data Output (LTC8143) 8-Pin SO and PDIP LT/GP 1195 6K * PRINTED IN USA 4 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977 + - + - 17 16 VDD VREF 18 RFB 1 OUT 1 + - U Table 1. Unipolar Binary Code Table 33pF DIGITAL INPUT LT1097 VOUT ANALOG OUTPUT VOUT -VREF (4095/4096) -VREF (2048/4096) = -VREF/ 2 -VREF (1/4096) 0V 7541 TA03 MSB 1111 1000 0000 0000 1111 0000 0000 0000 LSB 1111 0000 0001 0000 33pF R1 10k 1/2 LT1112 VOUT 7541 TA04 (c) LINEAR TECHNOLOGY CORPORATION 1995 |
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