LTC2641 Linear Technology, LTC2641 Datasheet
LTC2641
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LTC2641 Summary of contents
Page 1
... The LTC2641-16/LTC2642-16 provide 16-bit performance (±2LSB INL and ±1LSB DNL) over temperature. Unbuffered DAC outputs result in low supply current of 120μA and a low offset error of ±1LSB. Both the LTC2641 and LTC2642 feature a reference input TM Compatible range bipolar operation, the LTC2642 includes matched scaling resistors for use with an external precision op amp (such as the LT1678), generating a ± ...
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... JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB 2 (Note 1) Operating Temperature Range LTC2641C/LTC2642C ............................... 0°C to 70°C LTC2641I/LTC2642I ............................. –40°C to 85°C + 0.3V Maximum Junction Temperature .......................... 125°C + 0.3V Storage Temperature Range ................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C ...
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... LTC2641IDD-16#PBF LTC2641IDD-16#TRPBF LTC2641IDD-14#PBF LTC2641IDD-14#TRPBF LTC2641IDD-12#PBF LTC2641IDD-12#TRPBF LTC2641CMS8-16#PBF LTC2641CMS8-16#TRPBF LTC2641CMS8-14#PBF LTC2641CMS8-14#TRPBF LTC2641CMS8-12#PBF LTC2641CMS8-12#TRPBF LTC2641IMS8-16#PBF LTC2641IMS8-16#TRPBF LTC2641IMS8-14#PBF LTC2641IMS8-14#TRPBF LTC2641IMS8-12#PBF LTC2641IMS8-12#TRPBF LTC2642 LTC2642CDD-16#PBF LTC2642CDD-16#TRPBF ...
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... L CONDITIONS Unipolar Mode (LTC2641) Bipolar Mode (LTC2642) Measured from 10% to 90% To ±0.5LSB of FS Major Carry Transition Code = 0000hex; NCS = V DD SCLK, DIN Levels DD Code = FFFFhex Code = 0000hex, V ...
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... Note 2: Continuous operation above the specifi ed maximum operating junction temperature may impair device reliability. Note 3: LTC2641-16/LTC2642-16 ±1LSB = ±0.0015% = ±15.3ppm of full scale. LTC2641-14/LTC2642-14 ±1LSB = ±0.006% = ±61ppm of full scale. LTC2641-12/LTC2642-12 ±1LSB = ±0.024% = ±244ppm of full scale. ...
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... LTC2641/LTC2642 TYPICAL PERFORMANCE CHARACTERISTICS www.DataSheet4U.com Integral Nonlinearity (INL) 1.0 LTC2642-16 0 2.5V REF 0.6 DD 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 16384 32768 49152 65535 CODE 26412 G01 Differential Nonlinearity (DNL) 1.0 LTC2642-16 0 2.5V REF 0.6 DD 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 16384 32768 49152 65535 CODE ...
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... Unbuffered Full-Scale Error vs Temperature (LTC2641-16) 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 –40 – TEMPERATURE (°C) 26412 G11 I vs Code (Unipolar LTC2641) REF 250 V = 2.5V REF 200 150 100 50 0 16383 0 16384 32768 49152 CODE 26412 G14 I vs Code (Bipolar LTC2642) REF 250 V REF = 2 ...
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... CS 5V/DIV CODE CODE 32767 32768 V OUT 20mV/DIV LTC2641-16 500ns/DIV UNBUFFERED C = 10pF L 3 26412 G23 5.5V OUT DD (POR Function) LTC2641 REF 0V TO 5.5V 2V/DIV V OUT 10mV/DIV 26412 G26 LTC2641-16 50ms/DIV UNBUFFERED C = 10pF L 5 26412 G21 CODE 32767 26412 G24 26412 G27 ...
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... Feedback Resistor. Connect to an external FB amplifi er’s output in bipolar mode. The bipolar output range is –V V (Pin 9): Supply Voltage. Set between 2.7V and DD 5.5V. GND (Pin 10): Circuit Ground. Exposed Pad (DFN Pin 11): Circuit Ground. Must be soldered to PCB ground. LTC2641/LTC2642 . REF REF 26412f 9 ...
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... An external voltage reference determines the DAC’s full-scale output volt- DD age. A 3-wire serial interface allows the LTC2641/LTC2642 to fi t into a small 8-/10-pin MSOP or DFN 3mm × 3mm package. 10 LTC2642-16 LTC2642-14 ...
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... N – 1 the 14-bit DACs, (LTC2641-14/LTC2642-14), the MSB remains in the same (left-justifi ed) position in the input 16-bit data word. Therefore, two “don’t-care” bits must be loaded after the LSB, to make up the required 16 data bits (Figure 1b). Similarly, for the 12-bit family members (LTC2641-12/LTC2642-12) four “ ...
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... Clearing the DAC A 10ns (minimum) low pulse on the ⎯ C ⎯ L ⎯ R pin asynchro- nously clears the DAC latch to code zero (LTC2641 midscale (LTC2642). The external amplifi er provides a unity-gain buffer. The LTC2642 can also be used in unipolar confi guration by ...
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... V (8,191/8,192) REF 1000 0000 0000 01xx V (1/8,192) REF 1000 0000 0000 00xx 0V 0111 1111 1111 11xx –V (1/8,192) REF 0000 0000 0000 00xx –V REF LTC2641/LTC2642 . Tables 2a, 2b and 2c show REF IN 5V GND 5V 0.1μF BIPOLAR V OUT –2.5V TO 2.5V 0.1μF – ...
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... OUT mode of operation, and also depends on the accuracy, speed, power dissipation and board area requirements of the application. The LTC2641/LTC2642’s combination of tiny package size, rail-to-rail single supply operation, low power dissipation, fast settling and nearly ideal accuracy specifi cations makes it impractical for one op amp type to fi ...
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... GND the positive supply rail. The small LSB size of a 16-bit DAC, coupled with the tight accuracy specifi cations on the LTC2641/LTC2642, means that the accuracy and input specifi cations for the external op amp are critical for overall DAC performance. ...
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... I IN – • OFFSET B B Settling Time with Op Amp Buffer When using an external op amp, the output settling time will still include the single pole settling on the LTC2641/LTC2642 V node, with time constant R OUT OUT buffered V Settling Time). C will include the buffer input ...
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... OUT plane. Care should be taken to ensure that no large GND return current paths fl ow through the “star GND” area. In particular, the resistance from the LTC2641 GND pin to the point where the V plane should be as low as possible. Excessive resistance here will be multiplied by the code dependent I ...
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... LTC2641/LTC2642 PACKAGE DESCRIPTION www.DataSheet4U.com 3.5 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH ...
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... DETAIL “A” 0.254 (.010) 0° – 6° TYP GAUGE PLANE 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 0.18 (.007) SEATING PLANE LTC2641/LTC2642 3.00 ± 0.102 (.118 ± .004) 0.52 (.0205) (NOTE REF 3.00 ± 0.102 4.90 ± 0.152 (.118 ± .004) (.193 ± .006) ...
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... LTC2641/LTC2642 TYPICAL APPLICATION www.DataSheet4U.com LTC2641- SCLK 4 DIN 5 CLR RELATED PARTS PART NUMBER DESCRIPTION DACs LTC1588/LTC1589 12-/14-/16-Bit SoftSpan TM LTC1592 LTC1595/LTC1596 Serial 16-Bit Current Output DACs LTC1591/LTC1597 Parallel 14-/16-Bit Current Output DACs LTC1599 16-Bit Current Output DAC LTC1650 16-Bit Voltage Output DAC ...