LTC7543/LTC8143 Improved Industry Standard Serial 12-Bit Multiplying DACs U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LTC® 7543/LTC8143 are serial-input 12-bit multiplying digital-to-analog converters (DACs). They are superior pin compatible replacements for the AD7543 and DAC-8143. Improvements include better accuracy, better stability over temperature and supply variations, lower sensitivity to output amplifier offset, tighter timing specifications and lower output capacitance. Improved Direct Replacement for AD7543 and DAC-8143 Low Cost DNL and INL Over Temperature: ±0.5LSB Easy, Fast and Flexible Serial Interface Daisy-Chain 3-Wire Interface for Multiple DAC Systems (LTC8143) 1LSB Maximum Gain Error Over Temperature Eliminates Adjustment Asynchronous Clear Input for Initialization Four-Quadrant Multiplication Low Power Consumption 16-Pin PDIP and SO Packages An easy-to-use serial interface includes an asynchronous CLEAR input for systems requiring initialization to a known state. The LTC8143 has a serial data output to allow daisychaining multiple DACs on a 3-wire interface bus. These DACs are extremely versatile. They can be used for 2-quadrant and 4-quadrant multiplying, programmable gain and single supply applications, such as noninverting voltage output and biased or offset ground mode. U APPLICATIONS ■ ■ ■ ■ ■ Process Control and Industrial Automation Remote Microprocessor-Controlled Systems Digitally Controlled Filters and Power Supplies Programmable Gain Amplifiers Automatic Test Equipment Parts are available in 16-pin PDIP and SO packages and are specified over the extended industrial temperature range, – 40°C to 85°C. , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATION Multiplying DAC Has Easy 3-Wire Serial Interface Integral Nonlinearity Over Temperature VIN 1.0 CLOCK DATA LOAD 4 7 5 14 15 16 RFB VDD VREF 1 OUT 1 STB1 LTC7543 SRI LTC8143 LD1 OUT 2 2 DGND AGND 12 3 33pF – LT ®1097 + VOUT 7543/8143 TA01 INTEGRAL NONLINEARITY (LSB) 5V 0.5 TA = 85°C TA = 25°C 0 TA = –40°C –0.5 –1.0 0 512 1024 1536 2048 2560 3072 3584 4095 DIGITAL INPUT CODE 7543/8143 TA02 1 LTC7543/LTC8143 U W U U W W W ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION VDD to AGND .............................................. – 0.5V to 7V VDD to DGND .............................................. – 0.5V to 7V AGND to DGND ............................................ VDD + 0.5V DGND to AGND ............................................ VDD + 0.5V Digital Inputs to DGND ............... – 0.5V to (VDD + 0.5V) VOUT1, VOUT2 to AGND ................. – 0.5V to (VDD + 0.5V) VREF to AGND, DGND............................................ ±25V VRFB to AGND, DGND ........................................... ±25V Maximum Junction Temperature .......................... 150°C Operating Temperature Range ............... – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ORDER PART NUMBER TOP VIEW OUT 1 1 16 RFB OUT 2 2 15 VREF AGND 3 14 VDD STB1 4 13 CLR LD1 NC (LTC7543) SRO (LTC8143) SRI 5 12 DGND 6 11 STB4 7 10 STB3 STB2 8 9 LTC7543GKN LTC7543KN LTC7543GKSW LTC7543KSW LTC8143EN LTC8143FN LTC8143ESW LTC8143FSW LD2 N PACKAGE 16-LEAD PDIP SW PACKAGE 16-LEAD PLASTIC SO WIDE TJMAX = 150°C, θJA = 100°C/ W (N) TJMAX = 150°C, θJA = 130°C/ W (SW) Consult factory for Military grade parts. ACCURACY CHARACTERISTICS – LTC7543 VDD = 5V, VREF = 10V, VOUT1 = VOUT2 = AGND = DGND =0V, TA = TMIN to TMAX, unless otherwise specified. SYMBOL PARAMETER LTC7543GK MIN TYP MAX CONDITIONS Resolution INL Integral Nonlinearity (Relative Accuracy) ● (Note 1) DNL Differential Nonlinearity Guaranteed Monotonic, TMIN to TMAX GE Gain Error (Note 2) ILKG Gain Temperature Coefficient (∆Gain/∆Temp) (Note 3) Output Leakage Current (Note 4) Zero-Scale Error PSRR 2 Power Supply Rejection Ratio VDD = 5V ±5% TA = 25°C TMIN to TMAX 12 MIN LTC7543K TYP MAX 12 UNITS Bits ● ±0.5 ±0.5 ● ±0.5 ±0.5 LSB ● ±1 ±1 ±2 ±2 LSB LSB 5 ppm/°C ● 1 5 1 LSB TA = 25°C TMIN to TMAX ● ±1 ±10 ±1 ±10 nA nA TA = 25°C TMIN to TMAX ● ±0.006 ±0.06 ±0.006 ±0.06 LSB LSB ● ±0.0001 ±0.002 ±0.0001 ±0.002 %/% LTC7543/LTC8143 ACCURACY CHARACTERISTICS – LTC8143 VDD = 5V, VREF = 10V, VOUT1 = VOUT2 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN Resolution ● LTC8143E TYP MAX 12 MIN LTC8143F TYP MAX 12 UNITS Bits INL Integral Nonlinearity (Relative Accuracy) (Note 1) ● ±0.5 ±1 LSB DNL Differential Nonlinearity Guaranteed Monotonic, TMIN to TMAX ● ±0.5 ±1 LSB GE Gain Error (Note 2) ● ±1 ±2 ±2 ±2 LSB LSB 5 ppm/°C ILKG Gain Temperature Coefficient (∆Gain/∆Temp) (Note 3) Output Leakage Current (Note 4) TA = 25°C TMIN to TMAX ● Zero-Scale Error PSRR 1 5 1 TA = 25°C TMIN to TMAX ● ±5 ±25 ±5 ±25 nA nA TA = 25°C TMIN to TMAX ● ±0.03 ±0.15 ±0.03 ±0.15 LSB LSB ● ±0.0001 ±0.002 ±0.0001 ±0.002 %/% Power Supply Rejection Ratio VDD = 5V ±5% ELECTRICAL CHARACTERISTICS – LTC7543/LTC8143 VDD = 5V, VREF = 10V, VOUT1 = VOUT2 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise specified. SYMBOL PARAMETER LTC7543/LTC8143 ALL GRADES MIN TYP MAX CONDITIONS UNITS Reference Input RREF VREF Input Resistance (Note 5) ● Output Current Settling Time (Notes 6, 7) Multiplying Feedthrough Error Digital-to-Analog Glitch Energy 8 11 15 kΩ ● 0.25 1 µs VREF = ±10V, 10kHz Sinewave ● 0.8 2 mVP-P (Notes 6, 8) ● 2 20 nV-sec Total Harmonic Distortion (Note 9) ● – 108 – 92 dB Output Noise Voltage Density (Note 10) ● 13 nV/√Hz AC Performance (Note 3) THD Analog Outputs (Note 3) COUT Output Capacitance DAC Register Loaded to All 1s COUT1 COUT2 ● ● 60 20 90 60 pF pF DAC Register Loaded to All 0s COUT1 COUT2 ● ● 30 50 60 90 pF pF Digital Inputs VIH Digital Input High Voltage VIL Digital Input Low Voltage IIN Digital Input Current VIN = 0V to VDD ● CIN Digital Input Capacitance (Note 3), VIN = 0V ● ● 2.4 V ● 0.001 0.8 V ±1 µA 8 pF Digital Outputs: SRO (LTC8143 Only) VOH Digital Output High IOH = – 200µA ● VOL Digital Output Low IOL = 1.6mA ● 4 V 0.4 V 3 LTC7543/LTC8143 ELECTRICAL CHARACTERISTICS – LTC7543/LTC8143 VDD = 5V, VREF = 10V, VOUT1 = VOUT2 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise specified. SYMBOL PARAMETER LTC7543/LTC8143 ALL GRADES MIN TYP MAX CONDITIONS UNITS Timing Characteristics (Note 3) tDS1 tDS2 Serial Input to Strobe Setup Time (tSTB = 80ns) STB1 Used as the Strobe ● 50 5 ns STB2 Used as the Strobe ● 20 –5 ns tDS3 STB3 Used as the Strobe ● 0 – 30 ns tDS4 STB4 Used as the Strobe ● 0 – 30 ns STB1 Used as the Strobe ● 30 10 ns tDH1 tDH2 Serial Input to Strobe Hold Time (tSTB = 80ns) STB2 Used as the Strobe ● 50 25 ns tDH3 STB3 Used as the Strobe ● 80 55 ns tDH4 STB4 Used as the Strobe ● 80 55 ns ● 80 ns tSRI Serial Input Data Pulse Width tSTB1, tSTB2, Strobe Pulse Width tSTB3, tSTB4 (Note 11) ● 80 ns tSTB1, tSTB2, Strobe Pulse Width tSTB3, tSTB4 (Note 12) ● 80 ns tLD1, tLD2 Load Pulse Width ● 140 ns tASB LSB Strobed into Input Register to Load DAC Register Time ● 0 ns tCLR Clear Pulse Width ● 80 ns SRO Timing Characteristics (LTC8143 Only) tPD STB2, STB3, STB4 Strobe to SRO Propagation Delay CL = 50pF ● 220 120 ns tPD1 STB1 to SRO Propagation Delay CL = 50pF ● 150 80 ns ● 4.75 5 Power Supply VDD Supply Voltage IDD Supply Current Digital Inputs = 0V or VDD Digital Inputs = VIH or VIL The ● 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 DAC register loaded with all 0s or IOUT2 with DAC register loaded with all 1s. Note 5: Typical temperature coefficient is 100ppm/°C. Note 6: OUT 1 load = 100Ω in parallel with 13pF. Note 7: To 0.01% for a full-scale change, measured from falling edge of LD1 or LD2. 4 ● ● 5.25 V 0.1 2 mA mA Note 8: VREF = 0V. DAC register contents changed from all 0s to all 1s or from all 1s to all 0s. Note 9: VREF = 6VRMS at 1kHz. DAC register loaded with all 1s. Note 10: Calculation from en = √4KTRB where: K = Boltzmann constant (J/K°); R = resistance (Ω); T = resistor temperature (°K); B = bandwidth (Hz). Note 11: Minimum high time for STB1, STB2, STB4. Minimum low time for STB3. Note 12. Minimum low time for STB1, STB2, STB4. Minimum high time for STB3. LTC7543/LTC8143 W BLOCK DIAGRAM 20k 20k 20k VREF 15 16 RFB 40k 40k 40k 40k 40k 40k 40k 10k 1 OUT 1 2 OUT 2 VDD 14 3 AGND DECODER CLR 13 BIT 1 (MSB) CLR LD1 5 BIT 2 BIT 3 BIT 4 BIT 12 (LSB) DAC REGISTER LOAD LD2 9 STB1 4 CLK STB2 8 INPUT 12-BIT SHIFT REGISTER 7 SRI IN OUT STB3 10 STB4 11 6 SRO 7543/8143 BD LTC8143 ONLY DGND 12 WU W TI I G DIAGRA tDH1 tDH2 tDH3 tDH4 tDS1 tDS2 tDS3 tDS4 tSTB1 tSTB2 tSTB3 tSTB4 STROBE INPUT STB1, STB2, STB4 (INVERT FOR STB3) tSTB1 tSTB2 tSTB3 tSTB4 tSRI SRI PREVIOUS WORD BIT 1 MSB BIT 2 BIT 12 LSB BIT 11 tASB tLD1 tLD2 LD1, LD2 tPD tPD1 SRO (LTC8143 ONLY) BIT 1 (MSB) PREVIOUS WORD BIT 2 BIT 3 BIT 12 LSB BIT 1 (MSB) CURRENT WORD 7543/8143 TD01 5 LTC7543/LTC8143 TRUTH TABLES Table 1. LTC7543/LTC8143 Input Register CONTROL INPUTS STB1 STB2 STB3 STB4 0 1 0 0 1 0 0 0 0 0 0 1 1 X X X X 1 X X X X 0 X X X X 1 Table 2. LTC7543/LTC8143 DAC Register Input Register Operation CONTROL INPUTS (LTC8143: SRO Operation) Serial Data Bit on SRI Loaded into Input Register, MSB First (LTC8143: Data Bit or SRI Appears on SRO Pin After 12 Clocked Bits) CLR 0 LD1 X LD2 X 1 1 1 X X 1 No DAC Register Operation 1 0 0 Load DAC Register with the Contents of Input Register No Input Register Operation (LTC8143: No SRO Operation) DAC Register Operation Reset DAC Register to All 0s (Asynchronous Operation; No Effect on Input Register) U TYPICAL APPLICATIONS Unipolar Operation (2-Quadrant Multiplication) VREF –10V TO 10V 5V 0.1µF 13 10 4 7 5 6 9 8 11 µP 14 15 16 STB3 CLR VDD VREF RFB STB1 SRI LTC7543 LD1 SRO (LTC8143) LTC8143 LD2 STB2 STB4 DGND AGND 12 33pF OUT 1 OUT 2 1 – + LT1097 2 3 TO NEXT DAC FOR DAISY-CHAINING (LTC8143) 7543/8143 TA03 Unipolar Binary Code Table DIGITAL INPUT BINARY NUMBER IN DAC REGISTER MSB LSB 6 VOUT 0V TO –VREF ANALOG OUTPUT VOUT 1111 1111 1111 – VREF (4095/4096) 1000 0000 0000 – VREF (2048/4096) = – VREF /2 0000 0000 0001 – VREF (1/4096) 0000 0000 0000 0V LTC7543/LTC8143 U TYPICAL APPLICATIONS Bipolar Operation (4-Quadrant Multiplication) VREF –10V TO 10V 5V 0.1µF 15 14 VDD R2 20k 16 VREF OUT 1 (LOGIC INPUTS OMITTED FOR CLARITY) – 1 LTC7543 LTC8143 OUT 2 DGND R3 20k 33pF RFB + 1/2 LT1112 R1 10k – 1/2 LT 1112 + 2 VOUT AGND 3 12 7543/8143 TA04 Bipolar Offset Binary Code Table DIGITAL INPUT BINARY NUMBER IN DAC REGISTER MSB LSB ANALOG OUTPUT VOUT 1111 1111 1111 VREF (2047/2048) 1000 0000 0001 VREF (1/2048) 1000 0000 0000 0V 0111 1111 1111 – VREF (1/2048) 0000 0000 0000 – VREF (2048/2048) = – VREF 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. 7 LTC7543/LTC8143 U PACKAGE DESCRIPTION Dimension in inches (millimeters) unless otherwise noted. N Package 16-Lead Plastic DIP 0.130 ± 0.005 (3.302 ± 0.127) 0.300 – 0.325 (7.620 – 8.255) ( 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 0.255 ± 0.015* 0.065 (6.477 ± 0.381) (1.651) TYP +0.025 0.325 –0.015 +0.635 8.255 –0.381 0.045 – 0.065 (1.143 – 1.651) 0.015 (0.381) MIN 0.009 – 0.015 (0.229 – 0.381) 0.770* (19.558) MAX ) 0.045 ± 0.015 (1.143 ± 0.381) 0.125 (3.175) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) N16 0694 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTURSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm). S Package 16-Lead Plastic SOL 0.398 – 0.413 (10.109 – 10.490) (NOTE 2) 0.291 – 0.299 (7.391 – 7.595) (NOTE 2) 0.010 – 0.029 × 45° (0.254 – 0.737) 0.005 (0.127) RAD MIN 16 0.093 – 0.104 (2.362 – 2.642) 0° – 8° TYP 0.009 – 0.013 (0.229 – 0.330) 14 13 12 11 10 9 0.394 – 0.419 (10.007 – 10.643) NOTE 1 0.050 (1.270) TYP NOTE 1 15 0.037 – 0.045 (0.940 – 1.143) 0.016 – 0.050 (0.406 – 1.270) 0.004 – 0.012 (0.102 – 0.305) 0.014 – 0.019 (0.356 – 0.482) TYP NOTE: 1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS. 2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm). 1 2 3 4 5 6 7 8 SOL16 0392 RELATED PARTS PART NUMBER DESCRIPTION LTC1257 Complete Serial I/O VOUT 12-Bit DAC 5V to 15V Single Supply in 8-Pin SO and PDIP LTC1451/LTC1452/LTC1453 Complete Serial I/O VOUT 12-Bit DACs 3V/5V Single Supply in 8-Pin SO and PDIP LTC7541A Parallel I/O Mulitplying 12-Bit DAC 12-Bit Wide Input LTC8043 Serial Mulitplying 12-Bit DAC 8-Pin SO and PDIP 8 Linear Technology Corporation COMMENTS LT/GP 0695 10K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977 LINEAR TECHNOLOGY CORPORATION 1995