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DAC1282IPWR データシート(PDF) 4 Page - Texas Instruments |
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DAC1282IPWR データシート(HTML) 4 Page - Texas Instruments |
4 / 43 page DAC1282 SBAS490 – DECEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Minimum/maximum specifications are at TA = –40°C to +85°C. Typical specifications are at TA = +25°C, AVDD = +2.5 V, AVSS = –2.5 V, fCLK = 4.096 MHz, VREF = 5 V, and DVDD = 3.3 V, unless otherwise noted. Refer to Figure 50. DAC1282 PARAMETER TEST CONDITIONS MIN TYP MAX UNIT PULSE MODE Output levels 31 steps, approximate 3 dB per step ±0.0195 ±2.5 V Gain error ±0.1 ±0.75 % Gain drift 3 ppm/ °C Offset ±0.5 ±3 mV Offset drift 3 µV/°C Output noise(7) 1.5 µVRMS Slew rate 5 V/ µs Settling time 0.1% final value 25 µs DC MODE Resolution 24 Bits Step response 100 µs Gain = 1/1 1.3 µVRMS Gain = 1/2 1.4 µVRMS Gain = 1/4 1.8 µVRMS DC noise(8) Gain = 1/8 2.7 µVRMS Gain = 1/16 4.7 µVRMS Gain = 1/32 8.5 µVRMS Gain = 1/64 16 µVRMS DIGITAL DATA MODE Data clock rate fCLK/16 Hz Ones-density full-scale modulation +FS and –FS, respectively 25 75 % Signal bandwidth –3 dB 8.2 kHz REFERENCE VOLTAGE INPUT (VREF) Reference voltage, VREF = VREF – AVSS 2.4 5 AVDD + 0.25 V Operating 220 k Ω Reference input impedance Power-down 10 M Ω SIGNAL SWITCH Signal range AVSS AVDD V Current Continuous ±50 mA Differential on-resistance VSWIN , VSWOUT = 0 V 2.8 Ω Differential on-resistance flatness VSWIN, VSWOUT = AVDD to AVSS 0.7 Ω On-resistance match between outputs VSWIN , VSWOUT = 0 V 0.04 Ω TA = +25°C ±0.1 Off-leakage current(9) nA TA = +85°C ±5 Off-isolation(10) 120 dB DIGITAL INPUT/OUTPUT (DVDD = 1.65 V to 3.6 V) VOH IOH = 1 mA 0.8 × DVDD V VOL IOL = 1 mA 0.2 × DVDD V VIH 0.8 × DVDD DVDD V VIL DGND 0.2 × DVDD V Input hysteresis 0.5 V Input leakage ±10 µA fCLK CLK Input 1 4.096 4.225 MHz (7) VOUT = 0 V. Pulse mode output noise is measured by the ADS1282, over a 413-Hz bandwidth using ADC gain = 1. (8) VOUT = 0 V. DC noise is measured by the ADS1282, over a 413-Hz bandwidth using complementing gain. DC noise is referred to a 1.77-V full-scale ADC output. Divide output-referred noise by the ADC gain to yield input-referred noise. (9) Switch input or output voltage = AVDD – 0.5 V to AVSS + 0.5 V. (10) f = 31.25 Hz, 1.77 VRMS. Switch output loaded 2 x 10 kΩ to mid-supply range. 4 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): DAC1282 |
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