LTC2755 Linear Technology, LTC2755 Datasheet
LTC2755
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LTC2755 Summary of contents
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... DACs offer six output ranges—two unipolar and four bipolar—that can be programmed through the parallel interface, or pinstrapped for operation in a single range. The LTC2755 DACs use a bidirectional input/output paral- lel interface that allows readback of any internal register, including the DAC output span settings. A power-on reset circuit resets the DAC outputs to 0V when power is initially applied ...
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... For more information on tape and reel specifi cations, go to: 2 (Notes 1, 2) Operating Temperature Range LTC2755C ..................................................... 0°C to 70°C to GND ..................±15V LTC2755I .................................................. –40°C to 85°C Maximum Junction Temperature........................... 125°C Storage Temperature Range ................... –65°C to 150°C +0.3V (max 7V ...
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... REF code = Full Scale, –3dB Range ±10V, 10kHz REF Sine Wave (Note 8) (Note 9) Multiplying (Note 10 OUT1 LTC2755 denotes the ● = 25°C. A LTC2755B-16 LTC2755A-16 MAX MIN TYP MAX MIN TYP ±1 ±1 ±0.2 ±1 ±2 ±0.4 ± ...
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... LTC2755 www.DataSheet4U.com ELECTRICAL CHARACTERISTICS specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Power Supply V Supply Voltage DD I Supply Current Digital Inputs V Digital Input High Voltage IH V Digital Input Low Voltage ...
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... CONDITIONS C = 10pF L (Note 11) No Update No Update (Note 11) (Note 11) (Note 11) No Data Shoot-Through (Note 11) (Note 11 10pF L (Note 11 10pF L (Note 11) No Update No Update LTC2755 MIN TYP MAX UNITS ● ● ● ● ● ● ● ...
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... COM2 Note 5: Using LT1469 with C = 15pF . A ±0.0015% settling time FEEDBACK of 1.7μs can be achieved by optimizing the time constant on an individual basis. See Application Note 74, Component and Measurement Advances Ensure 16-Bit DAC Settling Time. TYPICAL PERFORMANCE CHARACTERISTICS LTC2755-16 Integral Nonlinearity (INL) 1 0.8 V ...
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... G05 +INL –INL (V) REF 2755 G08 +INL –INL 4 4.5 5 5.5 V (V) DD 2755 G09b LTC2755 T = 25°C, unless otherwise noted. A Gain Error vs Temperature REF 12 ±10V RANGE 8 0.6ppm/°C (TYP –4 –8 –12 –16 –40 –20 ...
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... LTC2755-12 Integral Nonlinearity (INL REF ±10V RANGE 0.6 0.4 0.2 0.0 –0.2 –0.4 –0.6 –0.8 –1.0 0 1024 LTC2755-12, LTC2755-14, LTC2755-16 Supply Current vs Logic Input Voltage DIGITAL INPUT VOLTAGE (V) 8 Differential Nonlinearity (DNL) 1.0 0.8 0.6 0.4 ...
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... D5-D13 (Pins 4-12): LTC2755-14 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D13 is the MSB. D7-D15 (Pins 4-12): LTC2755-16 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D15 is the MSB. GND (Pin 13): Shield Ground, provides necessary shielding for I ...
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... REF2 Typically 5V; accepts up to ±15V. MSPAN (Pin 33): Manual Span Control Pin. MSPAN is used to confi gure the LTC2755 for operation in a single, fi xed 10 output range. When confi gured for single-span operation, the output range is set via hardware pin strapping. The span I/O port’ ...
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... RIN1 to RCOM1. For normal operation tie RIN1 to the external reference voltage VREF1 (see Typical Applica- tions). Typically 5V; accepts up to ±15V. Exposed Pad (Pin 65): Ground. The Exposed Pad must be soldered to the PCB. LTC2755 to ground. VOSB to ground. VOSA fl ows through the feedback resistor OUT1A (Pin 64) ...
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... LTC2755 www.DataSheet4U.com BLOCK DIAGRAM LTC2755-16 DATA I/O 4-12, 36-42 PORT SPAN I/O 1, 52, 47 PORT A2 16 DAC A1 17 ADDRESS DATA INPUT DATA DAC REGISTER REGISTER SPAN INPUT 3 SPAN DAC 3 REGISTER REGISTER 16 16 DATA INPUT DATA DAC REGISTER REGISTER SPAN INPUT ...
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... Write, Update and Clear Timing VALID VALID VALID Readback Timing VALID VALID VALID LTC2755 VALID t 25 2753 TD01 VALID 2753 TD02 2755f 13 ...
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... V DD LTC2755- DAC A MSPAN S2 S1 DAC B S0 D/S DAC C DAC D 16 DATA I/O WR UPD READ DAC ADDRESS Figure 1. Using MSPAN to Confi gure the LTC2755 for Single-Span Operation (±10V Range). – ±10V + – ±10V + – ±10V + – ±10V + 2755 F01 2755f ...
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... DACs power up in the manually-chosen range at the appropriate code. Manual Span Confi guration Multiple output ranges are not needed in some applications. To confi gure the LTC2755 for single-span operation, tie the and the D/S pin to GND. The desired MSPAN pin output range is then specifi ...
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... Table 3. Address Codes VOSX Codes not shown are reserved and should not be used. *If readback is taken using the ALL DACs address, the LTC2755 defaults to DAC A. DAC CHANNEL DAC A DAC B DAC C DAC D ALL DACs* 2755f ...
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... OV V OUTX 010 8000 H 011 C000 H = 2.5V) using readback to check the contents of the input OUT HI-Z 8000 H 8000 0000 H INPUT REGISTER DAC REGISTER LTC2755 UPDATE (±5V RANGE 0V) OUT 0V (8000 IN ±5V RANGE) H 2755 TD03 4000 H UPDATE (5V) UPDATE (–5V) +5V –5V 2755 TD04 H UPDATE (2.5V) +2.5V ...
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... A (V/V) A1 • VOL1 A VOL1 V (mV) 0 OS2 I (mV (V/V) 0 VOL2 Table 6. Partial List of LTC Precision Amplifi ers Recommended for Use with the LTC2755 with Relevant Specifi cations AMPLIFIER μV nA LT1001 25 2 LT1097 50 0.35 LT1112 (Dual) 60 0.25 LT1124 (Dual ...
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... DAC settling time and op amp selection. Precision Voltage Reference Considerations Much in the same way selecting an operational amplifi er for use with the LTC2755 is critical to the performance of the system, selecting a precision voltage reference also requires due diligence. The output voltage of the LTC2755 is directly affected by the voltage reference ...
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... INL and DNL) of the LTC2755-16. Layout must be tied OUT2X Figures and 6 show the layout for the LTC2755 evaluation board, DC1112. This shows how to route the digital signals around the device without interfering with the reference and output op amps. Complete demo board documentation is available in the DC1112 quick start guide ...
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... APPLICATIONS INFORMATION Figure 3. LTC2755 Evaluation Board DC1112. Layer 1, Top Layer. Figure 4. LTC2755 Evaluation Board DC1112. Layer 2, GND Plane. LTC2755 2755 F03 2755 F04 2755f 21 ...
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... LTC2755 www.DataSheet4U.com TYPICAL APPLICATIONS Figure 5. LTC2755 Evaluation Board DC1112. Layer 3, Power Traces. Figure 6. LTC2755 Evaluation Board DC1112. Layer 4, Bottom Layer. 22 2755 F05 2755 F06 2755f ...
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... Plastic QFN (9mm × 9mm) (Reference LTC DWG # 05-08-1705 Rev C) 0.70 ±0.05 7.50 REF 8.10 ±0.05 9.50 ±0.05 (4 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0. 0.10 TYP 7.50 REF (4-SIDES) 0.200 REF 0.00 – 0.05 LTC2755 R = 0.115 TYP 63 64 PIN 1 CHAMFER C = 0.35 7.15 ± 0.10 7.15 ± 0.10 (UP64) QFN 0406 REV C 0.25 ± 0.05 0.50 BSC BOTTOM VIEW—EXPOSED PAD 23 0.40 ± 0.10 ...
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... REFB DD IN1 COM1 4 D15 5 D14 6 D13 7 D12 8 D11 9 D10 DATA I LTC2755- SPAN I DAC 17 A1 ADDRESS 18 A0 D/S WR CLR MSPAN READ UPD GND ...