LTC1667 Linear Technology Corporation, LTC1667 Datasheet
LTC1667
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LTC1667 Summary of contents
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... The differential current outputs of the DACs allow single-ended or true differential operation. The – output compliance of the LTC1666/ LTC1667/LTC1668 allows the outputs to be connected directly to external resistors to produce a differential out- put voltage without degrading the converter’s linearity. Al- ...
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... Consult LTC Marketing for parts specified with wider operating temperature ranges (Note 1) Power Dissipation ............................................. 500mW Operating Temperature Range LTC1666C/LTC1667C/LTC1668C ........... 0.3V) LTC1666I/LTC1667I/LTC1668I .......... – Storage Temperature Range ................ – 150 C + 0.3V) Lead Temperature (Soldering, 10 sec).................. 300 TOP VIEW ...
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... IREFIN IREFIN 50 30 0.1 0.2 = 1MHz OUT 76 = 1MHz OUT = 2.5MHz OUT = 5MHz OUT = 20MHz OUT 85 = 1MHz –75 OUT = 5MHz OUT = 10mA. OUTFS LTC1667 LTC1668 MIN TYP MAX MIN TYP MAX UNITS 0.1 0.2 0.1 0.2 % FSR 5 5 ppm FSR FSR ...
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... FS CLK OUT To 0.1% FSR Single Ended Differential Note 2: For the LTC1666, 1LSB = 0.024% of full scale; for the LTC1667, 1LSB = 0.006% of full scale = 61ppm of full scale; for the LTC1668, 1LSB = 0.0015% of full scale = 15.3ppm of full scale. = 10mA. OUTFS LTC1666/LTC1667/LTC1668 MIN TYP MAX ...
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... CLOCK 95 0dBFS 90 85 –6dBFS 80 –12dBFS (MHz) OUT 1666/7/8 G07 LTC1666/LTC1667/LTC1668 2-Tone SFDR 0 SFDR > 86dB – 50MSPS CLOCK f = 4.9MHz –20 OUT1 f = 5.09MHz OUT2 –30 AMPL = 0dBFS –40 –50 –60 –70 –80 –90 –100 4.5 5 ...
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... LTC1666/LTC1667/LTC1668 W U TYPICAL PERFOR A CE CHARACTERISTICS SFDR vs Digital Amplitude (dBFS) and /11 CLOCK OUT CLOCK 100 95 455kHz AT 5MSPS 4.55MHz AT 50MSPS 75 2.277MHz AT 25MSPS –20 –15 –10 –5 DIGITAL AMPLITUDE (dBFS) 1666/7/8 G10 Differential Output Full-Scale Transition V(I ) – V(I ) OUTA ...
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... LADCOM (Pin 18): Attenuator Ladder Common. Normally tied to GND. I (Pin 19): Complementary DAC Output Current. Full- OUT B scale output current occurs when all data bits are 0s. I (Pin 20): DAC Output Current. Full-scale output OUT A current occurs when all data bits are 1s. LTC1666/LTC1667/LTC1668 Differential Nonlinearity 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 – ...
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... LTC1666/LTC1667/LTC1668 CTIO S LTC1667 REFOUT (Pin 15): Internal Reference Voltage Output. Nominal value is 2.5V. Requires a 0.1 F bypass capacitor to AGND. I (Pin 16): Reference Input Current. Nominal value is REFIN 1.25mA for I = 10mA REFIN AGND (Pin 17): Analog Ground. LADCOM (Pin 18): Attenuator Ladder Common. Normally tied to GND ...
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... INPUT LATCHES AGND DGND CLK DB11 • • • DB0 • • • CLOCK 12-BIT INPUT DATA INPUT LTC1667 5V 0 2.5V ATTENUATOR REFERENCE LADDER SEGMENTED SWITCHES LSB SWITCHES FOR DB15–DB12 INT CURRENT SOURCE ARRAY • ...
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... LTC1666/LTC1667/LTC1668 W BLOCK DIAGRA V 15 REFOUT REF REFERENCE 0 SET REFIN + – 21 COMP1 22 COMP2 0 0.1 F – DIAGRA I OUT A 10 LTC1668 5V 0 2.5V ATTENUATOR LADDER SEGMENTED SWITCHES LSB SWITCHES FOR DB15–DB12 INT CURRENT SOURCE ARRAY • ...
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... U U APPLICATIO S I FOR ATIO Theory of Operation The LTC1666/LTC1667/LTC1668 are high speed current steering 12-/14-/16-bit DACs made on an advanced BiCMOS process. Precision thin film resistors and well matched bipolar transistors result in excellent DC linearity and stability. A low glitch current switching design gives excellent AC performance at sample rates up to 50Msps ...
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... LTC1661 R SET 1.9k Figure 2. Adjusting the Full-Scale Current of the LTC1666/LTC1667/LTC1668 with a DAC DAC Transfer Function The LTC1666/LTC1667/LTC1668 use straight binary digital coding. The complementary current outputs sink current from For I B OUTFS nal), I swings from 0mA when all bits are low (e.g., OUT A Code = 0) to 10mA when all bits are high (e ...
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... F V AGND DGND C2 SS 0.1 F 0.1 F – 5V CLK HP8110A DUAL IN PULSE GENERATOR LOW JITTER CLOCK SOURCE LTC1666/LTC1667/LTC1668 W U Output Compliance LADCOM 18 The specified output compliance voltage range is 1V. The I DC linearity specifications, INL and DNL, are trimmed and OUT A 20 guaranteed on I 52.3 I ...
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... I equal to 10mA. Output Configurations Based on the specific application requirements, the LTC1666/LTC1667/LTC1668 allow a choice of the best of several output configurations. Voltage outputs can be generated by external load resistors, transformer coupling or with an op amp I-to-V converter. Single-ended DAC output configurations use only one of the outputs, prefer- ably produce a single-ended voltage output ...
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... The minimum clock high and low times are guaranteed at 6ns and 8ns, respectively. These specifications allow the LTC1666/LTC1667/LTC1668 to be clocked 50Msps minimum. For best AC performance, the data and clock waveforms need to be clean and free of undershoot and overshoot. ...
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... The clock line needs to have accurately controlled imped- ance and should be well terminated near the LTC1666/ LTC1667/LTC1668. Printed Circuit Board Layout Considerations— Grounding, Bypassing and Output Signal Routing The close proximity of high frequency digital data lines and ...
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... U U APPLICATIO S I FOR ATIO LTC1666/LTC1667/LTC1668 ...
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... LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Figure 11. Suggested Evaluation Circuit Board—Silkscreen ...
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... U U APPLICATIO S I FOR ATIO Figure 12. Suggested Evaluation Circuit Board—Component Side LTC1666/LTC1667/LTC1668 ...
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... LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Figure 13. Suggested Evaluation Circuit Board—GND Plane ...
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... U U APPLICATIO S I FOR ATIO Figure 14. Suggested Evaluation Circuit Board—Power Plane LTC1666/LTC1667/LTC1668 ...
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... LTC1666/LTC1667/LTC1668 U U APPLICATIO S I FOR ATIO Figure 15. Suggested Evaluation Circuit Board—Solder Side ...
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... 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC1666/LTC1667/LTC1668 U G Package 28-Lead Plastic SSOP (5.3mm) ...
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... LTC1666/LTC1667/LTC1668 U TYPICAL APPLICATIO REFOUT R SET 0 REFIN COMP1 COMP2 0 0.1 F – 5V Figure 16. Arbitrary Waveform Generator Has 10V Output Swing, 50Msps DAC Update Rate RELATED PARTS PART NUMBER DESCRIPTION ADCs LTC1406 8-Bit, 20Msps ADC LTC1411 14-Bit, 2.5Msps ADC LTC1420 12-Bit, 10Msps ADC ...