LTC2640 Single 12-/10-/8-Bit SPI VOUT DACs with 10ppm/°C Reference DESCRIPTION FEATURES n n n n n n n n n n n n Integrated Precision Reference 2.5V Full-Scale 10ppm/°C (LTC2640-L) 4.096V Full-Scale 10ppm/°C (LTC2640-H) Maximum INL Error: 1LSB (LTC2640A-12) Bidirectional Reference: Input or 10ppm/°C Output Low Noise (0.7mVpp, 0.1Hz to 200kHz) Guaranteed Monotonic Over Temperature 2.7V to 5.5V Supply Range (LTC2640-L) Low Power Operation: 180μA at 3V Power Down to 1.8μA Maximum (C and I Grades) Asynchronous DAC Clear Pin (LTC2640-Z) Power-On Reset to Zero or Mid-Scale options Double-Buffered Data Latches Guaranteed Operation from –40°C to 125°C (H-Grade) 8-Lead TSOT-23 (ThinSOT™) Package APPLICATIONS n n n n n n Each DAC can also operate in External Reference mode, in which a voltage supplied to the REF pin sets the fullscale output. The LTC2640 DACs use a SPI/MICROWIRE™ compatible 3-wire serial interface which operates at clock rates up to 50MHz. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5396245, 5859606, 6891433, 6937178 and 7414561. (LTC2640-Z) VCC REF INTERNAL REFERENCE SDI The LTC2640-L has a full-scale output of 2.5V, and operates from a single 2.7V to 5.5V supply. The LTC2640-H has a full-scale output of 4.096V, and operates from a 4.5V to 5.5V supply. A 10ppm/°C reference output is available at the REF pin. The LTC2640 incorporates a power-on reset circuit. Options are available for Reset to Zero-Scale or Reset to Mid-Scale after power-up. Mobile Communications Process Control and Industrial Automation Automatic Test Equipment Portable Equipment Automotive Optical Networking BLOCK DIAGRAM The LTC®2640 is a family of 12-, 10-, and 8-bit voltageoutput DACs with an integrated, high-accuracy, low-drift reference in an 8-lead TSOT-23 package. It has a rail-to-rail output buffer that is guaranteed monotonic. Integral Nonlinearity (LTC2640A-LZ12) 1.0 SWITCH VCC = 3V VFS = 2.5V 0.5 SCK CONTROL DECODE LOGIC 24-BIT SHIFT REGISTER RESISTOR DIVIDER INL (LSB) n DACREF CS/LD INPUT REGISTER DAC REGISTER DAC 0 –0.5 VOUT –1.0 CLR 0 1024 2048 3072 4095 CODE GND 2640 TA01b 2640 TA01 2640fb 1 LTC2640 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltage (VCC) ................................... –0.3V to 6V CLR, CS/LD, REF_SEL, SCK, SDI ................. –0.3V to 6V VOUT, REF ......................... –0.3V to Min(VCC + 0.3V, 6V) Operating Temperature Range LTC2640C ................................................ 0°C to 70°C LTC2640I.............................................. –40°C to 85°C LTC2640H (Note 3) ............................ –40°C to 125°C Maximum Junction Temperature........................... 150°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C PIN CONFIGURATION LTC2640-Z LTC2640-M TOP VIEW CS/LD 1 SCK 2 SDI 3 GND 4 8 CLR 7 VOUT 6 REF 5 VCC TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 TJMAX = 150°C (NOTE 6), θJA = 195°C/W TOP VIEW CS/LD 1 SCK 2 SDI 3 GND 4 8 REF_SEL 7 VOUT 6 REF 5 VCC TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 TJMAX = 150°C (NOTE 6), θJA = 195°C/W 2640fb 2 LTC2640 ORDER INFORMATION LTC2640 A C TS8 –L M 12 #TRM PBF LEAD FREE DESIGNATOR TAPE AND REEL TR = 2,500-Piece Tape and Reel TRM = 500-Piece Tape and Reel RESOLUTION 12 = 12-Bit 10 = 10-Bit 8 = 8-Bit POWER-ON RESET M = Reset to Mid-Scale Z = Reset to Zero-Scale FULL-SCALE VOLTAGE, INTERNAL REFERENCE MODE L = 2.5V H = 4.096V PACKAGE TYPE TS8 = 8-Lead Plastic TSOT-23 TEMPERATURE GRADE C = Commercial Temperature Range (0°C to 70°C) I = Industrial Temperature Range (–40°C to 85°C) H = Automotive Temperature Range (–40°C to 125°C) ELECTRICAL GRADE (OPTIONAL) A = ±1LSB Maximum INL (12-Bit) PRODUCT PART NUMBER Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 2640fb 3 LTC2640 PRODUCT SELECTION GUIDE PART NUMBER VFS WITH INTERNAL PART MARKING* REFERENCE POWER-ON RESET TO CODE PIN 8 RESOLUTION VCC MAXIMUM INL LTC2640A-LM12 LTDHV 2.5V • (4095/4096) Mid-Scale REF_SEL 12-Bit 2.7V – 5.5V ±1LSB LTC2640A-LZ12 LTDHW 2.5V • (4095/4096) Zero CLR 12-Bit 2.7V – 5.5V ±1LSB LTC2640A-HM12 LTDHX 4.096V • (4095/4096) Mid-Scale REF_SEL 12-Bit 4.5V – 5.5V ±1LSB LTC2640A-HZ12 LTDHY 4.096V • (4095/4096) Zero CLR 12-Bit 4.5V – 5.5V ±1LSB LTC2640-LM12 LTDHV 2.5V • (4095/4096) Mid-Scale REF_SEL 12-Bit 2.7V – 5.5V ±2.5LSB LTC2640-LM10 LTDHZ 2.5V • (1023/1024) Mid-Scale REF_SEL 10-Bit 2.7V – 5.5V ±1LSB LTC2640-LM8 LTDJF 2.5V • (255/256) Mid-Scale REF_SEL 8-Bit 2.7V – 5.5V ±0.5LSB LTC2640-LZ12 LTDHW 2.5V • (4095/4096) Zero CLR 12-Bit 2.7V – 5.5V ±2.5LSB LTC2640-LZ10 LTDJB 2.5V • (1023/1024) Zero CLR 10-Bit 2.7V – 5.5V ±1LSB LTC2640-LZ8 LTDJG 2.5V • (255/256) Zero CLR 8-Bit 2.7V – 5.5V ±0.5LSB LTC2640-HM12 LTDHX 4.096V • (4095/4096) Mid-Scale REF_SEL 12-Bit 4.5V – 5.5V ±2.5LSB LTC2640-HM10 LTDJC 4.096V • (1023/1024) Mid-Scale REF_SEL 10-Bit 4.5V – 5.5V ±1LSB LTC2640-HM8 LTDJH 4.096V • (255/256) Mid-Scale REF_SEL 8-Bit 4.5V – 5.5V ±0.5LSB LTC2640-HZ12 LTDHY 4.096V • (4095/4096) Zero CLR 12-Bit 4.5V – 5.5V ±2.5LSB LTC2640-HZ10 LTDJD 4.096V • (1023/1024) Zero CLR 10-Bit 4.5V – 5.5V ±1LSB LTC2640-HZ8 LTDJJ 4.096V • (255/256) Zero CLR 8-Bit 4.5V – 5.5V ±0.5LSB *The temperature grade is identified by a label on the shipping container. 2640fb 4 LTC2640 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VOUT unloaded unless otherwise specified. LTC2640-LM12/-LM10/-LM8/-LZ12/-LZ10/-LZ8, LTC2640A-LM12/-LZ12 (VFS = 2.5V) LTC2640-8 SYMBOL PARAMETER CONDITIONS MIN TYP LTC2640-10 LTC2640-12 MAX MIN TYP MAX MIN TYP LTC2640A-12 MAX MIN TYP MAX UNITS DC Performance l 8 10 12 12 Bits Monotonicity VCC = 3V, Internal Ref. (Note 4) l 8 10 12 12 Bits DNL Differential Nonlinearity VCC = 3V, Internal Ref. (Note 4) l ±0.5 INL Integral Nonlinearity VCC = 3V, Internal Ref. (Note 4) l ±0.05 ±0.5 ZSE Zero-Scale Error VCC = 3V, Internal Ref., Code = 0 l 0.5 VOS Offset Error VCC = 3V, Internal Ref. (Note 5) l ±0.5 VOSTC VOS Temperature VCC = 3V, Internal Ref. (Note 5) Coefficient FSE Full-Scale Error VFSTC Full-Scale Voltage VCC = 3V, Internal Ref. (Note 10) Temperature C-Grade Coefficient I-Grade H-Grade Resolution Load Regulation ROUT DC Output Impedance VCC = 3V, Internal Ref. (Note 11) Internal Ref., Mid-Scale, VCC = 3V ±10%, –5mA ≤ IOUT ≤ 5mA, VCC = 5V ±10%, –10mA ≤ IOUT ≤ 10mA Internal Ref., Mid-Scale, VCC = 3V ±10%, –5mA ≤ IOUT ≤ 5mA, VCC = 5V ±10%, –10mA ≤ IOUT ≤ 10mA ±1 ±1 LSB ±0.2 ±1 ±1 ±2.5 ±0.5 ±1 LSB 5 0.5 5 0.5 5 0.5 5 mV ±5 ±0.5 ±5 ±0.5 ±5 ±0.5 ±5 ±10 l ±0.5 ±0.08 ±0.4 ±10 ±10 ±10 ±10 ±10 ±0.08 ±0.4 ±10 ±0.08 ±0.4 ±10 ±10 ±10 ±0.08 ±0.4 ±10 ±10 ±10 ±10 ±10 ±10 mV μV/°C %FSR ppm/°C ppm/°C ppm/°C l 0.009 0.016 0.035 0.064 0.14 0.256 0.14 0.256 LSB/mA l 0.009 0.016 0.035 0.064 0.14 0.256 0.14 0.256 LSB/mA l 0.09 0.156 0.09 0.156 0.09 0.156 0.09 0.156 Ω l 0.09 0.156 0.09 0.156 0.09 0.156 0.09 0.156 Ω SYMBOL PARAMETER CONDITIONS MIN VOUT DAC Output Span External Reference Internal Reference PSR Power Supply Rejection VCC = 3V ±10% or 5V ±10% ISC Short-Circuit Output Current (Note 6) Sinking Sourcing VFS = VCC = 5.5V Zero-Scale; VOUT shorted to VCC Full-Scale; VOUT shorted to GND l l VCC Positive Supply Voltage For Specified Performance l ICC Supply Current (Note 7) VCC = 3V, VREF = 2.5V, External Reference VCC = 3V, Internal Reference VCC = 5V, VREF = 2.5V, External Reference VCC = 5V, Internal Reference l l l l ISD Supply Current in Power-Down Mode (Note 7) VCC = 5V, C-Grade, I-Grade VCC = 5V, H-Grade l l TYP MAX UNITS 0 to VREF 0 to 2.5 V V –80 dB 27 –28 48 –48 mA mA 5.5 V 150 180 160 190 200 240 210 260 μA μA μA μA 0.6 0.6 1.8 4 μA μA Power Supply 2.7 2640fb 5 LTC2640 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VOUT unloaded unless otherwise specified. LTC2640-LM12/-LM10/-LM8/-LZ12/-LZ10/-LZ8, LTC2640A-LM12/-LZ12 (VFS = 2.5V) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCC V 220 kΩ Reference Input Input Voltage Range l 0 Resistance l 160 Capacitance IREF Reference Current, Power-Down Mode 190 7.5 DAC Powered Down l pF 0.005 0.1 μA 1.250 1.260 V Reference Output l Output Voltage 1.240 Reference Temperature Coefficient ±10 ppm/°C Output Impedance 0.5 kΩ Capacitive Load Driving 10 μF 2.5 mA Short-Circuit Current VCC = 5.5V; REF Shorted to GND VIH Digital Input High Voltage VCC = 3.6V to 5.5V VCC = 2.7V to 3.6V l l VIL Digital Input Low Voltage VCC = 4.5V to 5.5V VCC = 2.7V to 4.5V l l 0.8 0.6 V V ILK Digital Input Leakage VIN = GND to VCC l ±1 μA CIN Digital Input Capacitance (Note 8) l 2.5 pF Settling Time VCC = 3V (Note 9) ±0.39% (±1LSB at 8-Bits) ±0.098% (±1LSB at 10-Bits) ±0.024% (±1LSB at 12-Bits) Digital I/O 2.4 2 V V AC Performance tS en 3.2 3.8 4.1 μs μs μs Voltage Output Slew Rate 1 V/μs Capacitance Load Driving 500 pF Glitch Impulse At Mid-Scale Transition 2.1 nV•s Multiplying Bandwidth External Reference 300 kHz Output Voltage Noise Density At f = 1kHz, External Reference At f = 10kHz, External Reference At f = 1kHz, Internal Reference At f = 10kHz, Internal Reference 140 130 160 150 nV√Hz nV√Hz nV√Hz nV√Hz Output Voltage Noise 0.1Hz to 10Hz, External Reference 0.1Hz to 10Hz, Internal Reference 0.1Hz to 200kHz, External Reference 0.1Hz to 200kHz, Internal Reference, CREF = 0.33μF 20 20 650 670 μVP-P μVP-P μVP-P μVP-P 2640fb 6 LTC2640 TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V. (See Figure 1) (Note 8). LTC2640-LM12/-LM10/-LM8/-LZ12/-LZ10/-LZ8, LTC2640A-LM12/-LZ12 (VFS = 2.5V) SYMBOL PARAMETER CONDITIONS t1 SDI Valid to SCK Setup l 4 ns t2 SDI Valid to SCK Hold l 4 ns t3 SCK High Time l 9 ns t4 SCK Low Time l 9 ns t5 CS/LD Pulse Width l 10 ns t6 LSB SCK High to CS/LD High l 7 ns t7 CS/LD Low to SCK High l 7 ns t9 CLR Pulse Width l 20 ns t10 CS/LD High to SCK Pos. Edge l 7 SCK Frequency MIN TYP MAX ns l 50% Duty Cycle UNITS 50 MHz ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V, VOUT unloaded unless otherwise specified. LTC2640-HM12/-HM10/-HM8/-HZ12/-HZ10/-HZ8, LTC2640A-HM12/-HZ12 (VFS = 4.096V) LTC2640-8 SYMBOL PARAMETER CONDITIONS MIN TYP LTC2640-10 LTC2640-12 MAX MIN TYP MAX MIN TYP LTC2640A-12 MAX MIN TYP MAX UNITS DC Performance Resolution l 8 8 10 Monotonicity VCC = 5V, Internal Ref. (Note 4) l DNL Differential Nonlinearity VCC = 5V, Internal Ref. (Note 4) l ±0.5 INL Integral Nonlinearity VCC = 5V, Internal Ref. (Note 4) l ±0.05 ±0.5 ZSE Zero-Scale Error VCC = 5V, Internal Ref., Code = 0 l 0.5 VOS Offset Error VCC = 5V, Internal Ref. (Note 5) l ±0.5 VOSTC VOS Temperature VCC = 5V, Internal Ref. (Note 5) Coefficient Full-Scale Error Full-Scale Voltage VCC = 5V, Internal Ref. (Note 10) Temperature C-Grade Coefficient I-Grade H-Grade ROUT 10 12 12 Bits 12 ±0.5 Bits ±1 ±1 LSB ±0.2 ±1 ±1 ±2.5 ±0.5 ±1 LSB 5 0.5 5 0.5 5 0.5 5 mV ±5 ±0.5 ±5 ±0.5 ±5 ±0.5 ±5 mV ±10 VCC = 5V, Internal Ref. (Note 11) l FSE VFSTC 12 ±0.08 ±0.4 ±10 ±10 ±10 ±10 ±0.08 ±0.4 ±10 ±10 ±10 ±10 ±10 ±0.08 ±0.4 ±10 ±10 ±10 Load Regulation VCC = 5V ±10%, Internal Ref. Mid-Scale, –10mA ≤ IOUT ≤ 10mA l 0.006 0.01 0.022 0.04 0.09 DC Output Impedance VCC = 5V ±10%, Internal Ref. Mid-Scale, –10mA ≤ IOUT ≤ 10mA l 0.09 0.156 0.09 0.156 0.09 0.156 0.16 μV/°C ±0.08 ±0.4 %FSR ±10 ±10 ±10 ppm/°C ppm/°C ppm/°C 0.09 0.16 LSB/mA 0.09 0.156 Ω 2640fb 7 LTC2640 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V, VOUT unloaded unless otherwise specified. LTC2640-HM12/-HM10/-HM8/-HZ12/-HZ10/-HZ8, LTC2640A-HM12/-HZ12 (VFS = 4.096V) SYMBOL PARAMETER CONDITIONS MIN VOUT DAC Output Span External Reference Internal Reference PSR Power Supply Rejection VCC = 5V ±10% ISC Short-Circuit Output Current (Note 6) Sinking Sourcing VFS = VCC = 5.5V Zero-Scale; VOUT shorted to VCC Full-Scale; VOUT shorted to GND l l VCC Positive Supply Voltage For Specified Performance l ICC Supply Current (Note 7) VCC = 5V, VREF = 4.096V, External Reference VCC = 5V, Internal Reference l l ISD Supply Current in Power-Down Mode (Note 7) VCC = 5V, C-Grade, I-Grade VCC = 5V, H-Grade l l TYP MAX UNITS 0 to VREF 0 to 4.096 V V –80 dB 27 –28 48 –48 mA mA 5.5 V 160 200 220 270 μA μA 0.6 0.6 1.8 4 μA μA VCC V 220 kΩ Power Supply 4.5 Reference Input Input Voltage Range l 0 Resistance l 160 Capacitance IREF 190 7.5 Reference Current, Power-Down Mode DAC Powered Down l Output Voltage l pF 0.005 0.1 μA 2.048 2.064 V Reference Output 2.032 Reference Temperature Coefficient ±10 ppm/°C Output Impedance 0.5 kΩ Capacitive Load Driving 10 μF 4.3 mA Short-Circuit Current VCC = 5.5V; REF Shorted to GND Digital I/O VIH Digital Input High Voltage l VIL Digital Input Low Voltage l 0.8 V ILK Digital Input Leakage VIN = GND to VCC l ±1 μA CIN Digital Input Capacitance (Note 8) l 2.5 pF Settling Time VCC = 5V (Note 9) ±0.39% (±1LSB at 8 Bits) ±0.098% (±1LSB at 10 Bits) ±0.024% (±1LSB at 12 Bits) 2.4 V AC Performance tS Voltage Output Slew Rate 3.7 4.2 4.6 1 Capacitance Load Driving μs μs μs V/μs 500 pF Glitch Impulse At Mid-Scale Transition 3.0 nV•s Multiplying Bandwidth External Reference 300 kHz 2640fb 8 LTC2640 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V, VOUT unloaded unless otherwise specified. LTC2640-HM12/-HM10/-HM8/-HZ12/-HZ10/-HZ8, LTC2640A-HM12/-HZ12 (VFS = 4.096V) SYMBOL PARAMETER CONDITIONS en Output Voltage Noise Density At f = 1kHz, External Reference At f = 10kHz, External Reference At f = 1kHz, Internal Reference At f = 10kHz, Internal Reference MIN TYP 140 130 210 200 MAX nV√Hz nV√Hz nV√Hz nV√Hz UNITS Output Voltage Noise 0.1Hz to 10Hz, External Reference 0.1Hz to 10Hz, Internal Reference 0.1Hz to 200kHz, External Reference 0.1Hz to 200kHz, Internal Reference, CREF = 0.33μF 20 20 650 670 μVP-P μVP-P μVP-P μVP-P TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 4.5V to 5.5V. (See Figure 1) (Note 8). LTC2640-HM12/-HM10/-HM8/-HZ12/-HZ10/-HZ8, LTC2640A-HM12/-HZ12 (VFS = 4.096V) SYMBOL PARAMETER t1 SDI Valid to SCK Setup l 4 ns t2 SDI Valid to SCK Hold l 4 ns t3 SCK High Time l 9 ns t4 SCK Low Time l 9 ns t5 CS/LD Pulse Width l 10 ns t6 LSB SCK High to CS/LD High l 7 ns t7 CS/LD Low to SCK High l 7 ns t9 CLR Pulse Width l 20 ns t10 CS/LD High to SCK Pos. Edge l 7 ns SCK Frequency CONDITIONS 50% Duty Cycle Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All voltages are with respect to GND. Note 3: High temperatures degrade operating lifetimes. Operating lifetime is derated at temperatures greater than 105°C. Note 4: Linearity and monotonicity are defined from code kL to code 2N – 1, where N is the resolution and kL is given by kL = 0.016 • (2N/ VFS), rounded to the nearest whole code. For VFS = 2.5V and N = 12, kL = 26 and linearity is defined from code 26 to code 4,095. For VFS = 4.096V and N = 12, kL = 16 and linearity is defined from code 16 to code 4,095. Note 5: Inferred from measurement at code 16 (LTC2640-12), code 4 (LTC2640-10) or code 1 (LTC2640-8), and at full-scale. MIN l TYP MAX 50 UNITS MHz Note 6: This IC includes current limiting that is intended to protect the device during momentary overload conditions. Junction temperature can exceed the rated maximum during current limiting. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 7: Digital inputs at 0V or VCC. Note 8: Guaranteed by design and not production tested. Note 9: Internal Reference mode. DAC is stepped 1/4 scale to 3/4 scale and 3/4 scale to 1/4 scale. Load is 2k in parallel with 100pF to GND. Note 10: Temperature coefficient is calculated by dividing the maximum change in output voltage by the specified temperature range. Note 11: Full-scale error is determined using the reference voltage measured at the REF pin. 2640fb 9 LTC2640 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LTC2640-L12 (Internal Reference, VFS = 2.5V) Integral Nonlinearity (INL) 1.260 1.0 1.0 VCC = 3V 1.255 0 –0.5 VREF (V) 0.5 DNL (LSB) INL (LSB) VCC = 3V VCC = 3V 0.5 –1.0 Reference Output Voltage vs Temperature Differential Nonlinearity (DNL) 0 1.245 –0.5 0 2048 1024 3072 –1.0 4095 0 1024 CODE 2048 3072 1.240 –50 –25 4095 2640 G03 Full-Scale Output Voltage vs Temperature DNL vs Temperature 1.0 1.0 VCC = 3V 2.52 VCC = 3V VCC = 3V 0.5 FS OUTPUT VOLTAGE (V) 0.5 DNL (LSB) INL (POS) 0 DNL (POS) 0 DNL (NEG) INL (NEG) –0.5 –0.5 0 25 50 75 100 125 150 TEMPERATURE (°C) 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G02 INL vs Temperature –1.0 –50 –25 0 CODE 2640 G01 INL (LSB) 1.250 –1.0 –50 –25 0 2.50 2.49 2.48 –50 –25 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G04 2.51 0 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G05 Settling to ±1LSB 2640 G06 Settling to ±1LSB CS/LD 2V/DIV 3/4 SCALE TO 1/4 SCALE STEP VCC = 3V, VFS = 2.5V RL = 2k, CL = 100pF AVERAGE OF 256 EVENTS VOUT 1LSB/DIV 4.1μs 3.6μs VOUT 1LSB/DIV 1/4 SCALE TO 3/4 SCALE STEP VCC = 3V, VFS = 2.5V RL = 2k, CL = 100pF AVERAGE OF 256 EVENTS 2μs/DIV CS/LD 2V/DIV 2μs/DIV 2640 G08 2640 G07 2640fb 10 LTC2640 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LTC2640-H12 (Internal Reference, VFS = 4.096V) Integral Nonlinearity (INL) 1.0 1.0 2.068 VCC = 5V VCC = 5V VCC = 5V 0 –0.5 2.058 VREF (V) 0.5 DNL (LSB) INL (LSB) 0.5 –1.0 Reference Output Voltage vs Temperature Differential Nonlinearity (DNL) 0 –0.5 0 2048 1024 3072 –1.0 4095 2.038 0 1024 CODE 2048 3072 Full-Scale Output Voltage vs Temperature 1.0 VCC = 5V 4.115 VCC = 5V VCC = 5V 0.5 FS OUTPUT VOLTAGE (V) 0.5 DNL (LSB) INL (POS) 0 DNL (POS) 0 DNL (NEG) INL (NEG) –0.5 –0.5 25 50 75 100 125 150 TEMPERATURE (°C) 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G11 DNL vs Temperature 1.0 0 0 2640 G10 INL vs Temperature INL (LSB) 2.028 –50 –25 4095 CODE 2640 G09 –1.0 –50 –25 2.048 –1.0 –50 –25 0 4.095 4.085 4.075 –50 –25 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G12 4.105 0 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G13 Settling to ±1LSB 2640 G14 Settling to ±1LSB CS/LD 5V/DIV VOUT 1LSB/DIV 4.6μs 3.9μs VOUT 1LSB/DIV 1/4 SCALE TO 3/4 SCALE STEP VCC = 5V, VFS = 4.095V RL = 2k, CL = 100pF AVERAGE OF 256 EVENTS 2μs/DIV CS/LD 5V/DIV 3/4 SCALE TO 1/4 SCALE STEP VCC = 5V, VFS = 4.095V RL = 2k, CL = 100pF AVERAGE OF 256 EVENTS 2μs/DIV 2640 G16 2640 G15 2640fb 11 LTC2640 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LTC2640-10 Integral Nonlinearity (INL) Differential Nonlinearity (DNL) 1.0 1.0 VCC = 5V VFS = 4.096V INTERNAL REF. VCC = 5V VFS = 4.096V INTERNAL REF. 0.5 DNL (LSB) INL (LSB) 0.5 0 –0.5 –1.0 0 –0.5 0 512 256 768 –1.0 1023 0 512 256 CODE 768 1023 CODE 2640 G17 2640 G18 LTC2640-8 Integral Nonlinearity (INL) Differential Nonlinearity (DNL) 0.50 1.0 VCC = 3V VFS = 2.5V INTERNAL REF. VCC = 3V VFS = 2.5V INTERNAL REF. 0.25 DNL (LSB) INL (LSB) 0.5 0 –0.25 –0.5 –1.0 0 –0.50 0 128 64 192 255 0 128 64 192 255 CODE CODE 2640 G20 2640 G19 LTC2640 Load Regulation 8 6 Current Limiting 0.20 VCC = 5V (LTC2640-H) VCC = 5V (LTC2640-L) VCC = 3V (LTC2640-L) 0.15 VCC = 5V (LTC2640-H) VCC = 5V (LTC2640-L) VCC = 3V (LTC2640-L) 2 0.10 4 2 $VOUT (V) ΔVOUT (mV) Offset Error vs Temperature 3 0 –2 OFFSET ERROR (mV) 10 0.05 0 –0.05 –4 0 –1 –0.10 –6 –20 –10 0 10 IOUT (mA) 20 –2 –0.15 INTERNAL REF. CODE = MIDSCALE –8 –10 –30 1 30 2630 G21 –0.20 –30 INTERNAL REF. CODE = MIDSCALE –20 –10 0 10 IOUT (mA) 20 30 2630 G22 –3 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G23 2640fb 12 LTC2640 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LTC2640 Gain Error vs VCC 0.4 EXTERNAL REF. VREF = 2.5V 0.3 0.2 0.1 0.0 –0.1 0.2 0.1 –0.1 –0.2 –0.3 –0.3 3 3.5 4 4.5 5 VOUT 0.5V/DIV 0.0 –0.2 –0.4 2.5 VFS = VCC = 5V 1/4 SCALE TO 3/4 SCALE –0.4 –50 –25 5.5 Large-Signal Response EXTERNAL REF. VREF = 2.5V 0.3 GAIN ERROR (%FSR) GAIN ERROR (%FSR) Gain Error vs Temperature 0.4 0 VCC (V) 25 50 75 100 125 150 TEMPERATURE (°C) 2640 G24 2μs/DIV 2640 G26 2640 G25 Headroom at Rails vs Output Current Power-On Reset Glitch Mid-Scale-Glitch Impulse 5.0 LTC2640-L 5V SOURCING 4.5 4.0 VCC 2V/DIV VOUT (V) CS/LD 5V/DIV 3.5 LTC2640-H12, VCC = 5V: 3.0nV-s TYP VOUT 5mV/DIV ZERO-SCALE LTC2640-L12, VCC = 3V: 2.1nV-s TYP 3V (LTC2640-L) SOURCING 3.0 2.5 2.0 1.5 VOUT 2mV/DIV 5V SINKING 1.0 0.5 0 200μs/DIV 2μs/DIV 2640 G28 2640 G27 3V (LTC2640-L) SINKING 0 1 2 3 4 5 6 IOUT (mA) 7 8 9 10 2640 G29 Hardware CLR Supply Current vs Logic Voltage Exiting Power-Down to Mid-Scale 1.4 SWEEP SCK, SDI, CS/LD AND CLR BETWEEN 0V AND VCC 1.2 CS/LD 2V/DIV VOUT 1V/DIV ICC (mA) 1.0 VOUT 0.5V/DIV 0.8 VCC = 5V 0.6 0.4 VCC = 3V (LTC2640-L) 0.2 CLR 5V/DIV LTC2640-LZ LTC2640-H 0.0 4μs/DIV 2640 G30 0 1 3 2 LOGIC VOLTAGE (V) 4 5 1μs/DIV 2640 G32 2640 G31 2640fb 13 LTC2640 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. LTC2640 Multiplying Bandwidth 500 –2 NOISE VOLTAGE (nV/√Hz) –4 dB –6 –8 –10 –12 –14 VCC = 5V VREF(DC) = 2V –16 VREF(AC) = 0.2VP-P CODE = FULL SCALE –18 100k 10k 1k FREQUENCY (Hz) 0.1Hz to 10Hz Voltage Noise Noise Voltage vs Frequency 0 INTERNAL REF. CODE = MIDSCALE 400 300 LTC2640-H (VCC = 5V) 200 0 100 10μV/DIV LTC2640-L (VCC = 4V) 100 1000k LTC2640-L, VCC = 4V INTERNAL REF. CODE = MIDSCALE 10k 1k 100k 1M 1s/DIV 2640 G35 FREQUENCY (Hz) 2640 G33 2640 G34 PIN FUNCTIONS CS/LD (Pin 1): Serial Interface Chip Select/Load Input. When CS/LD is low, SCK is enabled for shifting data on SDI into the register. When CS/LD is taken high, SCK is disabled and the specified command (see Table 1) is executed. SCK (Pin 2): Serial Interface Clock Input. CMOS and TTL compatible. SDI (Pin 3): Serial Interface Data Input. Data on SDI is clocked into the DAC on the rising edge of SCK. The LTC2640 accepts input word lengths of either 24- or 32-bits. GND (Pin 4): Ground. VCC (Pin 5): Supply Voltage Input. 2.7V ≤ VCC ≤ 5.5V (LTC2640-L) or 4.5V ≤ VCC ≤ 5.5V (LTC2640-H). Bypass to GND with a 0.1μF capacitor. REF (Pin 6): Reference Voltage Input or Output. When External Reference mode is selected, REF is an input (0V ≤ VREF ≤ VCC) where the voltage supplied sets the full-scale voltage. When Internal Reference is selected, the 10ppm/°C 1.25V (LTC2640-L) or 2.048V (LTC2640-H) internal reference is available at the pin. This output may be bypassed to GND with up to 10μF (0.33μF is recommended), and must be buffered when driving external DC load current. VOUT (Pin 7): DAC Analog Voltage Output. CLR (Pin 8, LTC2640-Z): Asynchronous Clear Input. A logic low at this level-triggered input clears all registers and causes the DAC voltage output to reset to Zero. CMOS and TTL compatible. REF_SEL (Pin 8, LTC2640-M): Selects default Reference at power-up. Tie to VCC to select the Internal Reference, or GND to select an External Reference. After power-up, the logic state at this pin is ignored and the reference may be changed only by software command. 2640fb 14 LTC2640 BLOCK DIAGRAMS LTC2640-Z VCC REF INTERNAL REFERENCE SWITCH SDI SCK CONTROL DECODE LOGIC RESISTOR DIVIDER 24-BIT SHIFT REGISTER DACREF CS/LD INPUT REGISTER DAC REGISTER CLR DAC VOUT GND LTC2640-M VCC REF INTERNAL REFERENCE SDI SCK CONTROL DECODE LOGIC 24-BIT SHIFT REGISTER REF_SEL SWITCH RESISTOR DIVIDER DACREF CS/LD INPUT REGISTER DAC REGISTER DAC VOUT GND 2640 BD 2640fb 15 LTC2640 TIMING DIAGRAM t1 t2 SCK t3 1 2 t6 t4 3 23 24 t10 SDI t5 t7 CS/LD 2640 F01 Figure 1. Serial Interface Timing 2640fb 16 LTC2640 OPERATION The LTC2640-HM/LTC2640-LM provide an alternative reset, setting the output to mid-scale when power is first applied. The LTC2640 is a family of single voltage-output DACs in 8-lead ThinSOT packages. Each DAC can operate railto-rail using an external reference, or with its full-scale voltage set by an integrated reference. 12 combinations of accuracy (12-, 10-, and 8-bit), power-on reset value (zero or mid-scale), and full-scale voltage (2.5V or 4.096V) are available. The LTC2640 is controlled using a 3-wire SPI/MICROWIRE compatible interface. Default reference mode selection is described in the Reference Modes section. Power Supply Sequencing The voltage at REF (Pin 6) should be kept within the range –0.3V ≤ VREF ≤ VCC + 0.3V (see Absolute Maximum Ratings). Particular care should be taken to observe these limits during power supply turn-on and turn-off sequences, when the voltage at VCC (Pin 5) is in transition. Power-On Reset The LTC2640-HZ/LTC2640-LZ clear the output to zero-scale when power is first applied, making system initialization consistent and repeatable. Transfer Function For some applications, downstream circuits are active during DAC power-up, and may be sensitive to nonzero outputs from the DAC during this time. The LTC2640 contains circuitry to reduce the power-on glitch: the analog output typically rises less than 5mV above zeroscale during power on if the power supply is ramped to 5V in 1ms or more. In general, the glitch amplitude decreases as the power supply ramp time is increased. See “Power-On Reset Glitch” in the Typical Performance Characteristics section. The digital-to-analog transfer function is: k VOUT(IDEAL) = N VREF 2 where k is the decimal equivalent of the binary DAC input code, N is the resolution, and VREF is either 2.5V (LTC2640LM/LTC2640-LZ) or 4.096V (LTC2640-HM/LTC2640-HZ) when in Internal Reference mode, and the voltage at REF (Pin 6) when in External Reference mode. INPUT WORD (LTC2640-12) COMMAND C3 C2 C1 4 DON'T-CARE BITS C0 X X X X DATA (12 BITS + 4 DON'T-CARE BITS) D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 MSB D0 X X X X X X X X X X X X X X LSB INPUT WORD (LTC2640-10) COMMAND C3 C2 C1 4 DON'T-CARE BITS C0 X X X X DATA (10 BITS + 6 DON'T-CARE BITS) D9 D8 D7 D6 D5 D4 D3 D2 D1 MSB D0 X LSB INPUT WORD (LTC2640-8) COMMAND C3 C2 C1 4 DON'T-CARE BITS C0 X X X X DATA (8 BITS + 8 DON'T-CARE BITS) D7 MSB D6 D5 D4 D3 D2 D1 D0 LSB X X X 2640 F02 Figure 2. Command and Data Input Format 2640fb 17 LTC2640 OPERATION Serial Interface The CS/LD input is level triggered. When this input is taken low, it acts as a chip-select signal, enabling the SDI and SCK buffers and the input shift register. Data (SDI input) is transferred at the next 24 rising SCK edges. The 4-bit command, C3-C0, is loaded first, followed by 4 don’t-cares bits, and finally the 16-bit data word. The data word comprises the 12-, 10- or 8-bit input code, ordered MSB-to-LSB, followed by 4, 6 or 8 don’t-cares bits (LTC2640-12, LTC2640-10 and LTC2640-8 respectively; see Figure 2). Data can only be transferred to the device when the CS/LD signal is low, beginning on the first rising edge of SCK. SCK may be high or low at the falling edge of CS/LD. The rising edge of CS/LD ends the data transfer and causes the device to execute the command specified in the 24-bit input sequence. The complete sequence is shown in Figure 3a. The command (C3-C0) assignments are shown in Table 1. The first three commands in the table consist of write and update operations. A Write operation loads a 16-bit data word from the 24-bit shift register into the input register. In an Update operation, the input register is copied to the DAC register and converted to an analog voltage at the DAC output. Write to and Update combines the first two commands. The Update operation also powers up the DAC if it had been in power-down mode. The data path and registers are shown in the Block Diagram. Table 1. Command Codes COMMAND* C3 C2 C1 C0 0 0 0 0 Write to Input Register 0 0 0 1 Update (Power-Up) DAC Register 0 0 1 1 Write to and Update (Power-Up) DAC Register 0 1 0 0 Power Down 0 1 1 0 Select Internal Reference 0 1 1 1 Select External Reference *Command codes not shown are reserved and should not be used While the minimum input sequence is 24-bits, it may optionally be extended to 32-bits to accommodate microprocessors that have a minimum word width of 16-bits (2-bytes). To use the 32-bit width, 8 don’t-cares bits are transferred to the device first, followed by the 24-bit sequence described. Figure 3b shows the 32-bit sequence. The 16-bit data word is ignored for all commands that do not include a Write operation. Reference Modes For applications where an accurate external reference is not available, the LTC2640 has a user-selectable, integrated reference. The LTC2640-LM/LTC2640-LZ provide a fullscale output of 2.5V. The LTC2640-HM/LTC2640-HZ provide a full-scale output of 4.096V. The internal reference can be useful in applications where the supply voltage is poorly regulated. Internal Reference mode can be selected by using command 0110, and is the power-on default for LTC2640HZ/LTC2640-LZ, as well as for LTC2640-HM/LTC2640-LM when REF_SEL is tied high. The 10ppm/°C, 1.25V (LTC2640-LM/LTC2640-LZ) or 2.048V (LTC2640-HM/LTC2640-HZ) internal reference is available at the REF pin. Adding bypass capacitance to the REF pin will improve noise performance; 0.33μF is recommended, and up to 10μF can be driven without oscillation. This output must be buffered when driving an external DC load current. Alternatively, the DAC can operate in External Reference mode using command 0111. In this mode, an input voltage supplied externally to the REF pin provides the reference (0V ≤ VREF ≤ VCC) and the supply current is reduced. External Reference mode is the power-on default for LTC2640-HM/LTC2640-LM when REF_SEL is tied low. The reference mode of LTC2640-HZ/LTC2640-LZ can be changed only by software command. The same is true for LTC2640-HM/LTC2640-LM after power-on, after which the logic state on REF_SEL is ignored. 2640fb 18 LTC2640 OPERATION Power-Down Mode For power-constrained applications, the LTC2640’s powerdown mode can be used to reduce the supply current whenever the DAC output is not needed. When in powerdown, the buffer amplifier, bias circuit, and reference circuit are disabled and draw essentially zero current. The DAC output is put into a HIGH-impedance state, and the output pin is passively pulled to ground through a 200k resistor. Input and DAC register contents are not disturbed during power-down. The DAC can be put into power-down mode by using command 0100. The supply current is reduced to 1.8μA maximum (C and I grades) and the REF pin becomes HIGH impedance (typically > 1GΩ). Normal operation resumes after executing any command that includes a DAC update, as shown in Table 1. The DAC is powered up and its voltage output is updated. Normal settling is delayed while the bias, reference, and amplifier circuits are re-enabled. When the REF pin output is bypassed to GND with 1nF or less, the power-up delay time is 20μs for settling to 12-bits. This delay increases to 200μs for 0.33μF, and 10ms for 10μF. Voltage Output The LTC2640’s integrated rail-to-rail amplifier has guaranteed load regulation when sourcing or sinking up to 10mA at 5V, and 5mA at 3V. Load regulation is a measure of the amplifier’s ability to maintain the rated voltage accuracy over a wide range of load current. The measured change in output voltage per change in forced load current is expressed in LSB/mA. DC output impedance is equivalent to load regulation, and may be derived from it by simply calculating a change in units from LSB/mA to ohms. The amplifier’s DC output impedance is 0.1Ω when driving a load well away from the rails. When drawing a load current from either rail, the output voltage headroom with respect to that rail is limited by the 50Ω typical channel resistance of the output devices (e.g., when sinking 1mA, the minimum output voltage is 50Ω • 1mA, or 50mV). See the graph “Headroom at Rails vs. Output Current” in the Typical Performance Characteristics section. The amplifier is stable driving capacitive loads of up to 500pF. Rail-to-Rail Output Considerations In any rail-to-rail voltage output device, the output is limited to voltages within the supply range. Since the analog output of the DAC cannot go below ground, it may limit the lowest codes, as shown in Figure 4b. Similarly, limiting can occur near full-scale when the REF pin is tied to VCC. If VREF = VCC and the DAC full-scale error (FSE) is positive, the output for the highest codes limits at VCC, as shown in Figure 4c. No full-scale limiting can occur if VREF is less than VCC – FSE. Offset and linearity are defined and tested over the region of the DAC transfer function where no output limiting can occur. Board Layout The PC board should have separate areas for the analog and digital sections of the circuit. A single, solid ground plane should be used, with analog and digital signals carefully routed over separate areas of the plane. This keeps digital signals away from sensitive analog signals and minimizes the interaction between digital ground currents and the analog section of the ground plane. The resistance from the LTC2640 GND pin to the ground plane should be as low as possible. Resistance here will add directly to the effective DC output impedance of the device (typically 0.1Ω). Note that the LTC2640 is no more susceptible to 2640fb 19 LTC2640 OPERATION this effect than any other parts of this type; on the contrary, it allows layout-based performance improvements to shine rather than limiting attainable performance with excessive internal resistance. analog ground, digital ground, and power ground. When the LTC2640 is sinking large currents, this current flows out the ground pin and directly to the power ground trace without affecting the analog ground plane voltage. Another technique for minimizing errors is to use a separate power ground return trace on another board layer. The trace should run between the point where the power supply is connected to the board and the DAC ground pin. Thus the DAC ground pin becomes the common point for It is sometimes necessary to interrupt the ground plane to confine digital ground currents to the digital portion of the plane. When doing this, make the gap in the plane only as long as it needs to be to serve its purpose and ensure that no traces cross over the gap. 2640fb 20 SDI SCK CS/LD X 1 X 2 X X 4 X 5 X 8 DON’T-CARE BITS 3 6 C3 SDI C2 2 C1 3 X 7 X 8 C2 10 C1 11 X 7 X 8 D11 9 D10 10 D9 D8 12 D7 13 D6 14 24-BIT INPUT WORD 11 D5 15 D3 17 DATA WORD D4 16 D2 18 C0 12 X 14 X 15 X 16 32-BIT INPUT WORD 4 DON’T-CARE BITS X 13 D11 17 D10 18 D9 19 D8 20 D7 21 D6 22 D5 23 19 D1 24 D3 25 D0 20 DATA WORD D4 Figure 3b. LTC2640-12 32-Bit Load Sequence LTC2640-10 SDI Data Word: 10-Bit Input Code + 6 Don’t-Cares Bits; LTC2640-8 SDI Data Word: 8-Bit Input Code + 8 Don’t-Cares Bits COMMAND WORD 9 X 6 4 DON’T-CARE BITS X 5 Figure 3a. LTC2640-12 24-Bit Load Sequence (Minimum Input Word). LTC2640-10 SDI Data Word: 10-Bit Input Code + 6 Don’t-Cares Bits; LTC2640-8 SDI Data Word: 8-Bit Input Code + 8 Don’t-Cares Bits 4 C0 C3 COMMAND WORD 1 SCK CS/LD D2 26 X 21 D1 27 X 22 D0 28 X 23 X 29 X 24 X 30 31 X 2640 F03a X 32 2640 F03b LTC2640 OPERATION 2640fb 21 LTC2640 OPERATION VREF = VCC POSITIVE FSE VREF = VCC OUTPUT VOLTAGE OUTPUT VOLTAGE INPUT CODE (c) OUTPUT VOLTAGE 2640 F04 0V 0 0V NEGATIVE OFFSET 2,048 INPUT CODE (a) 4,095 INPUT CODE (b) Figure 4. Effects of Rail-to-Rail Operation on a DAC Transfer Curve (Shown for 12-Bits) (a) Overall Transfer Function (b) Effect of Negative Offset for Codes Near Zero (c) Effect of Positive Full-Scale Error for Codes Near Full-Scale 2640fb 22 LTC2640 PACKAGE DESCRIPTION TS8 Package 8-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1637) 0.52 MAX 2.90 BSC (NOTE 4) 0.65 REF 1.22 REF 1.4 MIN 3.85 MAX 2.62 REF 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.22 – 0.36 8 PLCS (NOTE 3) 0.65 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 1.95 BSC TS8 TSOT-23 0802 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 2640fb 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. 23 LTC2640 TYPICAL APPLICATION Programmable ±5V Output 5V 5V 4 0.1μF 5 0.1μF – LTC2054 3 SERIAL BUS 5 6 VCC REF 8 REF_SEL 3 SDI LTC2640A VOUT 7 2 SCK -LM12 1 1 + 2 CS/LD GND 4 10V 8 M9 9 M3 10 M1 1 P1 2 P3 3 P9 0.1μF 7 VCC LT1991 OUT REF VEE 4 6 VOUT = ±5V 5 0.1μF –10V 2640 TA03 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC1663 Single 10-Bit VOUT DAC in SOT-23 VCC = 2.7V to 5.5V, 60μA, Internal Reference, SMBus Interface LTC1669 Single 10-Bit VOUT DAC in SOT-23 VCC = 2.7V to 5.5V, 60μA, Internal Reference, I2C Interface LTC2360-LTC2362/ LTC2365-LTC2366 12-Bit SAR ADCs in TSOT23-6/TSOT23-8 Packages 100ksps/250ksps/500ksps/1Msps/3Msps Output Rates LTC2450/LTC2452 16-Bit Single-Ended/Differential Delta Sigma ADCs SPI Interface, Tiny DFN Packages, 60Hz Output Rate LTC2451/LTC2453 16-Bit Single-Ended/Differential Delta Sigma ADCs I2C Interface, Tiny DFN and TSOT23-8 Packages, 60Hz Output Rate LTC2600/LTC2610/LTC2620 Octal 16-/14-/12-Bit VOUT DACs in 16-Lead SSOP 250μA per DAC, 2.5V to 5.5V Supply Range, Rail-to-Rail Output, SPI Serial Interface LTC2601/LTC2611/LTC2621 Single 16-/14-/12-Bit VOUT DACs in 10-Lead DFN 300μA per DAC, 2.5V to 5.5V Supply Range, Rail-to-Rail Output, SPI Serial Interface LTC2602/LTC2612/LTC2622 Dual 16-/14-/12-Bit VOUT DACs in 8-Lead MSOP 300μA per DAC, 2.5V to 5.5V Supply Range, Rail-to-Rail Output, SPI Serial Interface LTC2604/LTC2614/LTC2624 Quad 16-/14-/12-Bit VOUT DACs in 16-Lead SSOP 250μA per DAC, 2.5V to 5.5V Supply Range, Rail-to-Rail Output, SPI Serial Interface LTC2605/LTC2615/LTC2625 Octal 16-/14-/12-Bit VOUT DACs with I2C Interface 250μA per DAC, 2.5V to 5.5V Supply Range, Rail-to-Rail Output, I2C Interface LTC2606/LTC2616/LTC2626 Single 16-/14-/12-Bit VOUT DACs with I2C Interface 270μA per DAC, 2.5V to 5.5V Supply Range, Rail-to-Rail Output, I2C Interface LTC2609/LTC2619/LTC2629 Quad 16-/14-/12-Bit VOUT DACs with I2C Interface 250μA per DAC, 2.5V to 5.5V Supply Range, Rail-to-Rail Output with Separate VREF Pins for Each DAC LTC2630 Single 12-/10-/8-Bit VOUT DACs with 10ppm/°C Reference in SC70 180μA per DAC, 2.7V to 5.5V Supply Range, 10ppm/°C Reference, Rail-to-Rail Output, SPI Interface LTC2631 Single 12-/10-/8-Bit I2C VOUT DACs with 10ppm/°C Reference in ThinSOT 180μA per DAC, 2.7V to 5.5V Supply Range, 10ppm/°C Reference, Selectable External Ref. Mode, Rail-to-Rail Output, I2C Interface 2640fb 24 Linear Technology Corporation LT 1108 REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2008