Multiplying Digital-to-Analog Converter

Burr Brown Products from Texas Instruments DA C8 805 DAC8805 SBAS391A – DECEMBER 2006 – REVISED MAY 2007 14-Bit, Dual, Parallel Input, Multiplying Digital-to-Analog Converter FEATURES • • • • • • • • • • • • • • • • • • • • • ±0.5LSB DNL ±0.5LSB INL Low Noise: 12nV/√Hz Low Power: IDD = 1µA per channel at 2.7V 2mA Full-Scale Current, with VREF = 10V Settling Time: 0.5µs 14-Bit Monotonic 4-Quadrant Multiplying Reference Inputs Reference Bandwidth: 10MHz Reference Input: ±18V Reference Dynamics: –105 THD Midscale or Zero Scale Reset Analog Power Supply: +2.7V to +5.5V TSSOP-38 Package Industry-Standard Pin Configuration Pin Compatible with the 16-Bit DAC8822 Temperature Range: –40°C to +125°C DESCRIPTION The DAC8805 dual, multiplying digital-to-analog converter (DAC) is designed to operate from a single 2.7V to 5.5V supply. The applied external reference input voltage VREF determines the full-scale output current. An internal feedback resistor (RFB) provides temperature tracking for the full-scale output when combined with an external, current-to-voltage (I/V) precision amplifier. A RSTSEL pin allows system reset assertion (RS) to force all registers to zero code when RSTSEL = '0', or to mid-scale code when RSTSEL = '1'. Additionally, an internal power-on reset forces all registers to zero or mid-scale code at power-up, depending on the state of the RSTSEL pin. A parallel interface offers high-speed communications. The DAC8805 is packaged in a space-saving TSSOP-38 package and has an industry-standard pinout. The device is specified from –40°C to +125°C. For a 16-bit, pin-compatible version, see the DAC8822. APPLICATIONS Automatic Test Equipment Instrumentation Digitally Controlled Calibration Industrial Control PLCs DGND D0 D13 WR A0 A1 Input B Register Control Logic Parallel Bus Interface Input A Register VDD R1A RCOMA R1A VREFA ROFSA ROFSA RFBA RFBA R2A DAC A Register DAC A IOUTA AGNDA DAC B Register DAC B IOUTB AGNDB RS LDAC RSTSEL Power-On Reset R1B R1B R2B ROFSB RFBB RCOMB VREFB ROFSB RFBB Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2006–2007, Texas Instruments Incorporated DAC8805 www.ti.com SBAS391A – DECEMBER 2006 – REVISED MAY 2007 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ORDERING INFORMATION (1) PRODUCT DAC8805Q RELATIVE ACCURACY (LSB) ±1 DIFFERENTIAL NONLINEARITY (LSB) ±1 PACKAGE-LEAD (DESIGNATOR) TSSOP-38 (DBT) SPECIFIED TEMPERATURE RANGE –40°C to +125°C PACKAGE MARKING DAC8805 (1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) DAC8805 VDD to GND Digital input voltage to GND V (IOUT) to GND REF, ROFS, RFB, R1, RCOM to AGND, DGND Operating temperature range Storage temperature range Junction temperature range (TJ max) Power dissipation Thermal impedance, RθJA ESD rating (1) Human Body Model (HBM) Charged Device Model (CDM) –0.3 to +7 –0.3 to +VDD + 0.3 –0.3 to +VDD + 0.3 ±25 –40 to +125 –65 to +150 +150 (TJ max – TA) / RθJA 53 4000 500 UNIT V V V V °C °C °C W °C/W V V Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to absolute maximum conditions for extended periods may affect device reliability. 2 Submit Documentation Feedback DAC8805 www.ti.com SBAS391A – DECEMBER 2006 – REVISED MAY 2007 ELECTRICAL CHARACTERISTICS All specifications at TA = –40°C to +125°C, VDD = +2.7V to +5.5V, IOUT = virtual GND, GND = 0V, and VREF = 10V, unless otherwise noted. DAC8805 PARAMETER STATIC PERFORMANCE Resolution Relative accuracy Differential nonlinearity Output leakage current Output leakage current Full-scale gain error Full-scale temperature coefficient Bipolar zero error Power-supply rejection ratio OUTPUT CHARACTERISTICS (1) Output current Output capacitance REFERENCE INPUT Reference voltage range Input resistance (unipolar) Input capacitance R1, R2 Feedback and offset resistance LOGIC INPUTS AND OUTPUT (1) Input low voltage VIL VDD = +2.7V VIL VDD = +5V VIH VDD = +2.7V VIH VDD = +5V IIL CIL VDD IDD Normal operation, logic inputs = 0V VIH = VDD and VIL = GND VIH = VDD and VIL = GND To 0.1% of full-scale, Data = 0000h to 3FFFh to 0000h To 0.006% of full-scale, Data = 0000h to 3FFFh to 0000h 2.7 3 3 1 2.1 2.4 0.001 1 8 0.6 0.8 V V V V µA pF ROFS, RFB 4 8 VREF RREF –18 4 5 5 5 10 6 12 18 6 V kΩ pF kΩ kΩ Code dependent 2 50 mA pF TA = +25°C Full temperature range PSRR VDD = 5V ±10% INL DNL Data = 0000h, TA = +25°C Data = 0000h, Full temperature range Unipolar, data = 3FFFh Bipolar, data = 3FFFh ±1 ±1 ±1 ±1 ±1 ±0.1 14 ±0.5 ±0.5 ±1 ±1 10 20 ±4 ±4 ±2 ±3 ±3 ±0.5 Bits LSB LSB nA nA mV mV ppm/°C mV mV LSB/V CONDITIONS MIN TYP MAX UNITS Input high voltage Input leakage current Input capacitance POWER REQUIREMENTS Supply voltage Supply current VDD = +4.5V to +5.5V VDD = +2.7V to +3.6V AC CHARACTERISTICS (1) (2) Output current settling time 5.5 6 6 3 V µA µA µA tS tS 0.3 0.5 10 5 –70 –100 1 –105 12 µs µs MHz nV–s dB dB nV–s dB nV/√Hz Reference multiplying BW DAC glitch impulse Feedthrough error Crosstalk error Digital feedthrough Total harmonic distortion Output noise density BW – 3dB VREF = 5VPP, Data = 3FFFh, 2-quadrant mode VREF = 0V to 10V, Data = 1FFFh to 2000h to 1FFFh VOUT/VREF Data = 0000h, VREF = 100kHz, ±10VPP, 2-quadrant mode VOUTA/VREFB Data = 0000h, VREFB = 100mVRMS, f = 100kHz LDAC = Logic low, VREF = –10V to + 10V Any code change THD VREF = 6VRMS, Data = 3FFFh, f = 1kHz eN f = 1kHz, BW = 1Hz, 2-quadrant mode (1) (2) Specified by design and characterization; not production tested. All ac characteristic tests are performed in a closed-loop system using a THS4011 I-to-V converter amplifier. Submit Documentation Feedback 3 DAC8805 www.ti.com SBAS391A – DECEMBER 2006 – REVISED MAY 2007 PIN ASSIGNMENTS DBT PACKAGE TSSOP-38 (TOP VIEW) NC NC ROFSA RFBA R1A RCOMA VREFA IOUTA AGNDA DGND AGNDB IOUTB VREFB RCOMB R1B RFBB ROFSB WR A0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 DAC8805 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 D0 D1 D2 D3 D4 D5 D6 D7 D8 VDD D9 D10 D11 D12 D13 RS RSTSEL LDAC A1 4 Submit Documentation Feedback DAC8805 www.ti.com SBAS391A – DECEMBER 2006 – REVISED MAY 2007 PIN ASSIGNMENTS (continued) Table 1. TERMINAL FUNCTIONS PIN # 1, 2 3 4 5 NAME NC ROFSA RFBA R1A DESCRIPTION No connection Bipolar Offset Resistor A. Accepts up to ±18V. In 2-quadrant mode, ROFSA ties to RFBA. In 4-quadrant mode, ROFSA ties to R1A and the external reference. Internal Matching Feedback Resistor A. Connects to the external op amp for I-V conversion. 4-Quadrant Resistor. In 2-quadrant mode, R1A shorts to the VREFA pin. In 4-quadrant mode, R1A ties to ROFSA and the reference input. Center Tap Point of the Two 4-Quadrant Resistors, R1A and R2A. In 2-quadrant mode, RCOMA shorts to the VREF pin. In 4-quadrant mode, RCOMA ties to the inverting node of the reference amplifier. DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, VREFA is the reference input with constant input resistance versus code. In 4-quadrant mode, VREFA is driven by the external reference amplifier. DAC A Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage output. DAC A Analog Ground. Digital Ground. DAC B Analog Ground. DAC B Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage output. DAC B Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, VREFB is the reference input with constant input resistance versus code. In 4-quadrant mode, VREFB is driven by the external reference amplifier. Center Tap Point of the Two 4-Quadrant Resistors, R1B and R2B. In 2-quadrant mode, RCOMB shorts to the VREF pin. In 4-quadrant mode, RCOMB ties to the inverting node of the reference amplifier. 4-Quadrant Resistor. In 2-quadrant mode, R1B shorts to the VREFB pin. In 4-quadrant mode, R1B ties to ROFSB and the reference input. Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion. Bipolar Offset Resistor B. Accepts up to ±18V. In 2-quadrant mode, ROFSB ties to RFBB. In 4-quadrant mode, ROFSB ties to R1B and the external reference. Write Control Digital Input In, Active Low. WR enables input registers. Signal level must be ≤ VDD + 0.3V. Address 0. Signal level must be ≤ VDD + 0.3V. Address 1. Signal level must be ≤ VDD + 0.3V. Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3V. See the Function of Control Inputs table for details. Power-On Reset State. RSTSEL = 0 corresponds to zero-scale reset. RSTSEL = 1 corresponds to mid-scale reset. The signal level must be ≤ VDD + 0.3V. Reset. Active low resets both input and DAC registers. Resets to zero-scale if RSTSEL= 0,