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DAC1282AIPW Scheda tecnica(PDF) 5 Page - Texas Instruments |
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DAC1282AIPW Scheda tecnica(HTML) 5 Page - Texas Instruments |
5 / 46 page DAC1282, DAC1282A www.ti.com SBAS490B – DECEMBER 2011 – REVISED MAY 2015 7.4 Electrical Characteristics Minimum and 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. DAC1282A supports gains = 1/1, 1/4, and 1/16 only. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ANALOG OUTPUT (VOUTP, VOUTN) Full-scale output voltage(1) Gain = 1/1 to 1/64 ±VREF /2 × gain V Output common-mode voltage(2) –0.1 V Differential output impedance 1.6 Ω CLOAD Capacitive load 2 nF RLOAD Resistive load 100 Ω Output current limit(3) ±60 mA TA = +25°C 2 High-Z output leakage nA TA = +85°C 50 DC PERFORMANCE (Excluding Pulse Mode) Gain error Gain = 1/1 ±0.1% ±0.75% Gain match Relative to gain = 1/1 ±0.05% ±0.5% Gain drift 2 ppm/°C ±(75/gain) + ppm Offset Gain = 1/1 to 1/64 ±(7/gain) + 50 300 FSR(4) ppm Offset drift 1.5 FSR/°C AC PERFORMANCE Gain = 1/1 –125 –118 dB Gain = 1/2, 1/4, 1/8 –125 dB DAC1282 Gain = 1/16 –123 dB THD Total harmonic distortion(5) Gain = 1/32 –115 dB Gain = 1/64 –111 dB Gain = 1/1 –118 –106 dB DAC1282A Gain = 1/4, 1/16 –118 dB Gain = 1/1 116 120 dB Gain = 1/2 119 dB Gain = 1/4 117 dB SNR Signal-to-noise ratio(6) Gain = 1/8 114 dB Gain = 1/16 110 dB Gain = 1/32 106 dB Gain = 1/64 100 dB Output frequency 0.4883 250 Hz Digital gain 0.5-dB steps Full mute 0 dB AVDD, AVSS 85 dB PSR Power-supply rejection 60-Hz ac, gain = 1/8 DVDD 120 dB (1) Full-scale differential output voltage: VOUT = (VOUTP – VOUTN) = ±VREF/2 × Gain. Gain is the DAC analog gain. (2) Output common-mode voltage scales with analog supply voltage: VCOM = 0.48 × (AVDD – AVSS) + AVSS. (3) Sink or source current limit of VOUTP and VOUTN. (4) FSR – full-scale range = VREF × gain. (5) THD = total harmonic distortion. THD is measured by the ADS1282, and is the sum of first nine harmonics using complementing gain. fOUT = 31.25 Hz, VOUT – 0.5 dBFS, no load. (6) SNR = signal-to-noise ratio. SNR is measured by the ADS1282 over a 413-Hz bandwidth using complementing gain. fOUT = 31.25 Hz and VOUT – 0.5 dBFS. Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: DAC1282 |
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