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ADS5270 bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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ADS5270 bảng dữ liệu(HTML) 4 Page - Texas Instruments |
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4 / 31 page  ELECTRICAL CHARACTERISTICS ADS5270 SBAS293F – JANUARY 2004 – REVISED JANUARY 2009............................................................................................................................................... www.ti.com TMIN = –40°C and TMAX = +85°C. Typical values are at TA = +25°C, clock frequency = maximum specified, 50% clock duty cycle, AVDD = 3.3V, LVDD = 3.3V, –1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per channel, unless otherwise noted. ADS5270 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS DC ACCURACY No Missing Codes Tested DNL Differential Nonlinearity fIN = 5MHz –0.9 ±0.5 +0.9 LSB INL Integral Nonlinearity fIN = 5MHz –2.0 ±0.6 +2.0 LSB Offset Error(1) –0.75 +0.75 %FS Offset Temperature Coefficient ±6 ppm/°C Fixed Attenuation in Channel(2) 1.5 %FS Fixed Attenuation Matching Across Channels 0.01 0.2 dB Gain Error/Reference Error(3) VREFT – VREFB –2.5 ±1.0 +2.5 %FS Gain Error Temperature Coefficient ±20 ppm/°C POWER REQUIREMENTS(4) Internal Reference Power Dissipation Analog Only (AVDD) 716 760 mW Output Driver (LVDD) 172 188 mW Total Power Dissipation 888 948 mW External Reference Power Dissipation Analog Only (AVDD) 650 mW Output Driver (LVDD) 172 mW Total Power Dissipation 822 mW Power-Down Clock Running 90 mW REFERENCE VOLTAGES VREFT Reference Top (internal) 1.9 1.95 2.0 V VREFB Reference Bottom (internal) 0.9 0.95 1.0 V VCM Common-Mode Voltage 1.4 1.45 1.5 V VCM Output Current (5) ±50mV Change in Voltage ±2.0 mA VREFT Reference Top (external) 1.825 1.95 2.0 V VREFB Reference Bottom (external) 0.9 0.95 1.075 V External Reference Common-Mode VCM ± 50mV V External Reference Input Current(6) 1.0 mA (1) Offset error is the deviation of the average code from mid-code with –1dBFS sinusoid from ideal mid-code (2048). Offset error is expressed in terms of % of full-scale. (2) Fixed attenuation in the channel arises due to a fixed attenuation in the sample-and-hold amplifier. When the differential voltage at the analog input pins are changed from –VREF to +VREF, the swing of the output code is expected to deviate from the full-scale code (4096LSB) by the extent of this fixed attenuation. NOTE: VREF is defined as (REFT – REFB). (3) The reference voltages are trimmed at production so that (VREFT – VREFB) is within ± 25mV of the ideal value of 1V. This specification does not include fixed attenuation. (4) Supply current can be calculated from dividing the power dissipation by the supply voltage of 3.3V. (5) VCM provides the common-mode current for the inputs of all eight channels when the inputs are ac-coupled. The VCM output current specified is the additional drive of the VCM buffer if loaded externally. (6) Average current drawn from the reference pins in the external reference mode. 4 Submit Documentation Feedback Copyright © 2004–2009, Texas Instruments Incorporated Product Folder Link(s): ADS5270 |
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