LTC2688CUJ-16#TRPBF

Data Sheet LTC2688 16-Channel, 16-Bit Voltage Output SoftSpan DAC FEATURES ► ► ► ► ► ► ► ► ► ► FUNCTIONAL BLOCK DIAGRAM 16 independent SoftSpan DACs Independently programmable output ranges: 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V, ±15 V Full 16-bit resolution at all ranges Flexible single- or dual-supply operation Maximum INL error: ±3 LSB Precision 4.096 V reference, ±5 ppm/°C maximum A/B toggle or sinusoidal dither using up to 3 toggle pins Multiplexer for output voltage and load current sense Outputs drive ±20 mA guaranteed 6 mm × 6 mm, 40-lead LFCSP APPLICATIONS Optical networking Instrumentation ► Data acquisition ► Automatic test equipment ► Process control and industrial automation ► ► Figure 1. GENERAL DESCRIPTION The LTC2688 is a 16-channel,16-bit, ±15 V digital-to-analog converter (DAC) with an integrated precision reference. The LTC2688 is guaranteed monotonic and has built in rail-to-rail output buffers that can source or sink up to 20 mA. This SoftSpan™ DAC offers five output ranges up to ±15 V. The range of each channel is independently programmable. The internal 4.096 V precision reference sets the accuracy of the output voltage. An external reference can be used for additional range options. Three toggle pins support Input Register A and Input Register B toggle or sinusoidal dither at multiple frequencies. An analog multiplexer simplifies measurement of pin voltages, load currents, and junction temperature. Programmable offset and gain registers improve the accuracy of the DAC outputs. The serial peripheral interface (SPI) and MICROWIRE™-compatible, 3-wire serial interface operates on logic levels as low as 1.71 V and clock rates up to 50 MHz. Rev. 0 DOCUMENT FEEDBACK TECHNICAL SUPPORT Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Data Sheet LTC2688 TABLE OF CONTENTS Features................................................................ 1 Applications........................................................... 1 Functional Block Diagram......................................1 General Description...............................................1 Specifications........................................................ 3 Timing Characteristics........................................6 Absolute Maximum Ratings...................................7 Thermal Resistance........................................... 7 ESD Caution.......................................................7 Pin Configuration and Function Descriptions........ 8 Typical Performance Characteristics................... 10 Terminology......................................................... 17 Theory of Operation.............................................18 Power-On Reset...............................................18 Power Supply Sequencing............................... 18 Serial Interface................................................. 19 Writing Codes to DACs.................................... 21 Span Selection and Channel Settings..............22 Read Commands............................................. 22 Offset and Gain Adjustment............................. 23 Analog Mux...................................................... 25 Toggle and Dither Operation............................ 26 Daisy-Chain Mode............................................33 Power-Down Mode...........................................33 Asynchronous DAC Update Using LDAC.........35 Fault Detection................................................. 35 Configuration Register......................................36 Reference Modes............................................. 36 Voltage Outputs................................................36 Thermal Overload Protection........................... 37 Applications Information...................................... 38 Printed Circuit Board Layout............................ 38 Command Addresses.......................................... 39 Outline Dimensions............................................. 41 Ordering Guide.................................................41 Evaluation Boards............................................ 42 REVISION HISTORY 6/2021—Revision 0: Initial Version analog.com Rev. 0 | 2 of 42 Data Sheet LTC2688 SPECIFICATIONS All specifications apply over the full operating temperature range, unless otherwise noted. Typical values are at TA = 25°C. VCC = 5 V, IOVCC = 5 V, V1+ = V2+ = 15 V, V− = −15 V, VREF = 4.096 V, VOUT unloaded, unless otherwise specified. For ±15 V range, V1+ = V2+ = 18 V, V− = −18 V. Table 1. Parameter DC PERFORMANCE Resolution Monotonicity Differential Nonlinearity Integral Nonlinearity Unipolar Offset Error VOS Temperature Coefficient Single-Supply Zero-Scale Error Bipolar Zero Error BZE Temperature Coefficient Gain Error Gain Temperature Coefficient Output Voltage Swing Power Supply Rejection Symbol DNL INL VOS ZSE BZE GE VOUT PSR Load Regulation DC Crosstalk3, 0 V to 5 V Range Vx+/V− Short-Circuit Output Current4, ±15 V Output Range ISC Test Conditions/Comments All ranges1 All ranges1 All ranges1 0 V to 5 V range 0 V to 10 V range All unipolar ranges All unipolar ranges, V− = GND All bipolar ranges All bipolar ranges All ranges, external reference To V− (unloaded) To Vx+ (unloaded) To V− (−20 mA ≤ output current (IOUT) ≤ +20 mA), ±15 V range To Vx+ (−20 mA ≤ IOUT ≤ +20 mA), ±15 V range VCC = 5 V ± 5% Vx+/V− = 15 V ± 5% −20 mA ≤ IOUT ≤ +20 mA, Vx+ = +17.2 V, V− = −17.2 V, ±15 V range Due to full-scale output change Due to load current change Due to powering down (per channel) Negative full scale, forcing output to GND Min Typ TA = TMIN to TMAX Reference Temperature Coefficient6 Line Regulation Short-Circuit Current REFCOMP Pin Short-Circuit Current Load Regulation Output Voltage Noise Density REFERENCE INPUT Range Current Capacitance POWER SUPPLY Analog Supply Voltage Analog Positive Supply ±0.5 ±1 1 2 analog.com 4 ±0.04 ±0.08 2 V− + 0.004 Vx+ − 0.004 V− + 2.2 Vx+ − 2.2 −80 −80 70 dB dB μV/mA 150 ±2 ±1 ±4 μV μV/mA μV mA −41 4.094 4.092 4.096 4.096 ±2 −80 0.1 10 320 32 2.0 4.75 VCC – 0.3 Bits Bits LSB LSB mV mV ppm/°C mV % FSR2 ppm/°C % FSR2 ppm/°C V V V V 10 8 VCC V1+ ±1 ±3 ±2 ±4 2 VCC ± 5% Forcing output to GND Forcing output to GND IOUT = 1 μA REFCOMP, capacitor (CREFCOMP) = REF capacitor (CREF) = 0.1 μF, at f = 10 kHz External reference mode7 Unit 16 16 Positive full scale, forcing output to GND REFERENCE Reference Output Voltage5 Max 41 mA 4.098 4.100 ±5 V V ppm/°C dB mA μA mV/mA nV/√Hz VCC – 0.6 15 V μA pF 5.25 V– + 42 V V Rev. 0 | 3 of 42 Data Sheet LTC2688 SPECIFICATIONS Table 1. Parameter Analog Negative Supply Digital Input/Output (I/O) Supply Voltage Supply Current VCC8 Vx+/V−9 IOVCC Shutdown Supply Current VCC V+ V− ANALOG MUX MUX DC Output Impedance MUX Leakage Current MUX Output Voltage Range MUX Continuous Current10 Junction Temperature Sense Slope Junction Temperature Accuracy AC PERFORMANCE Settling Time 0 V to 5 V Range, ±5 V Step 0 V to 10 V Range or ±5 V Range, ±10 V Step ±10 V Range, ±20 V Step ±15 V Range, ±30 V Step Voltage Output Slew Rate Capacitive Load Driving Glitch Impulse11 DAC to DAC Crosstalk12 Output Noise Spectral Density DIGITAL INPUT/OUTPUT (I/O) Digital Output High Voltage Digital Output Low Voltage Digital High-Z Output Leakage analog.com Symbol Test Conditions/Comments V2+ V− IOVCC IVCC IS IIOVCC Min Typ VCC – 0.3 –21 1.71 VCC = 5 V; 0 V to 5 V range VCC = 5 V; 0 V to 10 V range VCC = 5 V; ±5 V range VCC = 5 V; ±10 V range VCC = 5 V; ±15 V range Vx+/V− = ±15 V; 0 V to 5 V range Vx+/V− = ±15 V; 0 V to 10 V range Vx+/V− = ±15 V; ±5 V range Vx+/V− = ±15 V; ±10 V range Vx+/V− = ±15 V; ±15 V range IOVCC = 5 V, digital inputs at IOVCC or GND 21.9 22.3 25.6 29.6 33.6 6.4 6.4 8.3 10.8 13 0.05 VCC = 5 V V+/V− = ±15 V V+/V− = ±15 V 20 30 −30 Max Unit V1+ + 0.3 0 VCC + 0.3 V V V mA mA mA mA mA mA mA mA mA mA μA 37.0 15 1 μA μA μA 3.5 7.95 ±5 kΩ μA V mA mV/°C °C