ltc1821 Linear Technology Corporation, ltc1821 Datasheet
ltc1821
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ltc1821 Summary of contents
Page 1
... Precise 16-bit bipolar 10V outputs are achieved with on-chip 4-quadrant multiplication resistors. The LTC1821 is available in a 36-lead SSOP package and is specified over the industrial temperature range. The device includes an internal deglitcher circuit that reduces the glitch impulse to less than 2nV• ...
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... AGNDF, AGNDS............... – 0. OUT Maximum Junction Temperature .......................... 150 C Operating Temperature Range LTC1821C/LTC1821-1C .......................... LTC1821I/LTC1821-1I ....................... – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are T + – ...
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... Load + – 0V 15V –15V OUT + – 2k 15V –15V L + – 2k 5V –5V L (Note Digital Inputs = 15V 5V LTC1821 = MIN MAX MIN TYP MAX UNITS 4 nV•s 2 nV•s ...
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... LTC1821 ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: 1LSB = 0.0015% of full scale = 15.3ppm of full scale. Note 3: Using internal feedback resistor. Note 4: Guaranteed by design, not subject to test. Note 5: I with DAC register loaded to all 0s. ...
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... V = 10V REF 0 2.5V REF 10V REF – 0 2.5V REF – 0.4 – 0.6 – 0.8 –1 SUPPLY VOLTAGE (V) LTC1821 Differential Nonlinearity (DNL) 1.0 0.8 0.6 0.4 0.2 0 – 0.2 – 0.4 – 0.6 – 0.8 –1.0 65535 0 16384 32768 DIGITAL INPUT CODE 1821 G08 Differential Nonlinearity vs Reference Voltage in Unipolar Mode 1.0 0.8 0.6 0.4 0.2 0 – 0.2 – ...
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... FREQUENCY (Hz) 1821 G19 *DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR ZERO ERROR TO – 96dB TYPICAL (–78dB MAX, A GRADE) V REF LT1468 – 2 12pF 12pF OUT 13 LTC1821 10M 1821 G20 15pF V OUT ...
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... CLR (Pin 7): Digital Clear Control Function for the DAC. When CLR is taken to a logic low, it sets the DAC output and all internal registers to: zero code for the LTC1821 and midscale code for the LTC1821-1. REF (Pin 8): Reference Input and 4-Quadrant Resistor R2. ...
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... TRUTH TABLE Table 1 CONTROL INPUTS CLR WR LD REGISTER OPERATION Reset Input and DAC Register to All 0s for LTC1821 and Midscale for LTC1821-1 (Asynchronous Operation Write Input Register with All 16 Data Bits Load DAC Register with the Contents of the Input Register 1 ...
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... Additionally, the power supplies for the LTC1821 can go as low as 4.5V and 4.5V. In this case for a 2.5V or – 2.5V reference, the output range – 2.5V 2.5V and 2.5V. The LTC1821 has three additional precision resistors on chip for bipolar operation. Refer to the block diagram regarding the fol- lowing description ...
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... DAC registers in a master slave or edge-triggered configuration. This mode of operation occurs when WR and LD are tied together. The asynchronous clear pin resets the LTC1821 to zero scale and the LTC1821-1 to midscale. CLR resets both the input and DAC registers. These devices also have a power-on reset. Table 1 shows the truth table for the LTC1821 ...
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... U U APPLICATIONS INFORMATION Bipolar Mode (4-Quadrant Multiplying – V OUT The LTC1821 contains on chip all the 4-quadrant resistors necessary for bipolar operation. 4-quadrant multiplying V REF COM DATA INPUTS LTC1821 CLR Figure 2. Bipolar Operation (4-Quadrant Multiplication) V ...
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... Because of the extremely high accuracy of the 16-bit LTC1821, careful thought should be given to the selection of a precision voltage reference. As shown in the section describing the basic operation of the LTC1821, the output voltage of the DAC circuit is directly affected by the voltage reference; thus, any voltage reference error will appear as a DAC output voltage error ...
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... DAC CLR DNC* DNC* DNC* NC DGND AGNDF *DO NOT CONNECT ERA82.004 ALTERNATE AMPLIFIER FOR OPTIMUM SETTLING TIME PERFORMANCE 16 AGNDS AGNDF 17 6 LT1468 ERA82.004 LTC1821 22pF 14 I OUT + 15 V 15V 0.1 F – OUT 0V TO –10V V OUT + – –15V ...
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... LTC203AC 3 0 0.1 F LT1468 2 – 0.1 F – V 15pF REF R COM CC OFS OFS R2 FB 16-BIT DAC LTC1821 LD CLR DNC* DNC* DNC* NC DGND 22pF OUT + V 15 – OUT + – AGNDF AGNDS ...
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... TYP 0.800 (0.0315) BSC ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.254mm (0.010") PER SIDE LTC1821 15.290 – 15.544* (0.602 – 0.612) 10.160 – 10.414 (0.400 – 0.410) 2.286 – 2.387 (0.090 – 0.094) 0.127 – 0.305 0.304 – ...
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... LTC1821 RELATED PARTS PART NUMBER DESCRIPTION ADCs LTC1417 Low Power 400ksps, 14-Bit ADC LTC1418 14-Bit, 200ksps, Single 5V ADC LTC1604/LTC1608 16-Bit, 333ksps/500ksps, 5V ADC LTC1605/LTC1606 16-Bit, 100ksps/250ksps, Single 5V ADC LTC1609 16-Bit, 200ksps, Single 5V ADC LTC2400 24-Bit, Micropower LTC2410 24-Bit, Fully Differential, No Latency DACs ...