LTC1657L Linear Technology Corporation, LTC1657L Datasheet
LTC1657L
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LTC1657L Summary of contents
Page 1
... X1/X2 pin is connected. The LTC1657 operates from a 4.5V to 5.5V supply and has an onboard 2.048V reference. The LTC1657L operates from a 2.7V to 5.5V supply and has an onboard 1.25V reference. The LTC1657/LTC1657L are similar to Linear Technol- ogy Corporation’ ...
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... TTL Input Voltage, REFHI, REFLO, X1/X2 ....................................................... – 0. REFOUT ............................ – 0. OUT Operating Temperature Range LTC1657C/LTC1657LC .......................... LTC1657I/LTC1657LI ...................... – Maximum Junction Temperature .......................... 125 C Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are unloaded, REFOUT tied to REFHI, REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted ...
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... Shorted to GND OUT V Shorted to V OUT CC Input Code = 0 (LTC1657) Input Code = 0 (LTC1657L) Input Code = 65535, LTC1657 4.5V to 5.5V CC Input Code = 65535, LTC1657L 2.7V to 5.5V CC (Note 5) (Note 5) to 0.0015% (16-Bit Settling Time) (Note 5) to 0.012% (13-Bit Settling Time) (Note 6) DAC Switch Between 8000 and 7FFF H H ...
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... Note 3: Nonlinearity is defined from code 128 to code 65535 (full scale). See Applications Information. Note 4: Digital inputs Note 5: DAC switched between all 1s and all 0s The denotes specifications which apply over the full operating = 5V (LTC1657 (LTC1657L), unless otherwise noted. CC MIN 2.4 = GND ...
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... G08 LTC1657/LTC1657L LTC1657 Integral Nonlinearity –1 –2 –3 –4 –5 0 16384 32768 49152 65535 DIGITAL INPUT CODE 1657 G03 LTC1657L Minimum Supply Headroom for Full Output Swing vs Load Current 2.0 CODE ALL 1s 1.8 V 1LSB OUT V = 2.5V OUT 1.6 1.4 125 C 1.2 1 0.8 0.6 –55 C ...
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... LOGIC INPUT VOLTAGE (V) LTC1657 Large-Signal Transient Response 5 V UNLOADED OUT TIME (20 s/DIV) LTC1657L Offset Error vs Temperature 1.0 0.8 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 – 0.8 –1.0 125 –55 –10 35 TEMPERATURE ( C) 1657 G11 LTC1657 Supply Current vs Temperature 700 680 660 640 ...
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... REFHI (Pin 22): Upper input terminal of the DAC’s internal resistor ladder. Typically connected to REFOUT. An input code of (FFFF) output buffer to 1LSB below this voltage. REFOUT (Pin 23): Output of the internal reference is 2.048V (LTC1657), 1.25V (LTC1657L). Typically con- nected to REFHI to drive internal DAC resistor ladder. V (Pin 24): Positive Power Supply Input. 4. ...
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... LTC1657/LTC1657L CTIO S CLR (Pin 27): Clear Input (Asynchronous Active Low). A low on this pin asynchronously resets all input and DAC registers to 0s. U DIGITAL INTERFACE TRUTH TABLE CLR CSMSB CSLSB ...
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... for X1/X2 connected to V OUT for X1/X2 connected to GND Nominal LSBs: (V tie to V REFOUT REFHI LTC1657 LSB = 4.096V/65536 = 62.5 V LTC1657L LSB = 2.5V/65536 = 38.1 V DAC Transfer Characteristic OUT for X1/X2 connected for X1/X2 connected to GND CODE = Decimal equivalent of digital input (0 CODE 65535) Zero-Scale Error (ZSE): The output voltage when the DAC is loaded with all zeros ...
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... REFLO, respectively) are not connected inter- nally on this part. Typically, REFHI will be connected to REFOUT and REFLO will be connected to GND. X1/X2 connected to GND will give the LTC1657/LTC1657L a full- scale output swing of 4.096V/2.5V. Either of these pins can be driven using the buffer in the gain-of-1 configuration. The resistor ...
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... Offset and linearity are defined and tested over the region of the DAC transfer function where no output limiting can occur OUTPUT REF CC VOLTAGE 0 32768 INPUT CODE (a) LTC1657/LTC1657L / and the DAC full-scale CC REF CC as shown in Figure 1c. No full-scale limiting CC is less than (V – FSE)/2. REF ...
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... LTC1657/LTC1657L U TYPICAL APPLICATIO S This circuit shows how to make a bipolar output 16-bit DAC with a wide output swing using an LTC1657 and an LT1077. R1 and R2 resistively divide down the LTC1657 output and an offset is summed in using the LTC1657 onboard 2.048V reference and R3 and R4. R5 ensures that ...
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... Digitally Programmable Current Source 0.1 F REFHI REFOUT LTC1657 V OUT LT1218 2 – X1/X2 REFLO GND LTC1657/LTC1657L is determined by the load resistor R S voltage. With a load resistor the 5V < V < 100V S FOR )(4.096 OUT (65536)( 0mA TO 10mA 6 ...
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... LTC1657/LTC1657L PACKAGE DESCRIPTIO 0.0075 – 0.0098 (0.191 – 0.249) 0.016 – 0.050 (0.406 – 1.270) * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE ...
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... MIN BSC MIN LTC1657/LTC1657L 1.370* (34.789) MAX 0.065 (1.651) TYP ...
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... LTC1657/LTC1657L U TYPICAL APPLICATIO S This circuit shows how to measure negative offset. Since LTC1657/LTC1657L operate on a single supply, if their offset is negative, the output for code 0 limits at 0V. To Although LTC1657 output 4.096V with its internal reference, higher voltages can be achieved with the help of another op amp ...