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ADS5231 데이터시트(PDF) 4 Page - Burr-Brown (TI) |
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ADS5231 데이터시트(HTML) 4 Page - Burr-Brown (TI) |
4 / 26 page www.ti.com ELECTRICAL CHARACTERISTICS ADS5231 SBAS295A – JULY 2004 – REVISED JANUARY 2007 T MIN = –40°C and TMAX = +85°C. Typical values are at TA = +25°C, clock frequency = 40MSPS, 50% clock duty cycle, AVDD = 3.3V, VDRV = 3.3V, transformer-coupled inputs, –1dBFS, I SET = 56.2kΩ, and internal voltage reference, unless otherwise noted. ADS5231 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS DC ACCURACY No Missing Codes Tested DNL Differential Nonlinearity fIN = 5MHz –0.9 ±0.3 +0.9 LSB INL Integral Nonlinearity fIN = 5MHz –2.5 ±0.4 +2.5 LSB Offset Error(1) –0.75 ±0.2 +0.75 % FS Offset Temperature Coefficient(2) ±6 ppm/ °C Fixed Attenuation in Channel(3) 1 %FS Fixed Attenuation Matching Across Channels 0.01 0.2 dB Gain Error/Reference Error(4) –3.5 ±1.0 +3.5 % FS Gain Error Temperature Coefficient ±40 ppm/ °C POWER REQUIREMENTS(5) Internal Reference Power Dissipation(5) Analog Only (AVDD) 235.5 271 mW Output Driver (VDRV) 85.5 109 mW Total Power Dissipation 321 380 mW External Reference Power Dissipation Analog Only (AVDD) 200 mW Output Driver (VDRV) 85.5 mW Total Power Dissipation 285.5 mW Total Power-Down Clock Running 83 mW REFERENCE VOLTAGES VREFT Reference Top (internal) 1.9 2.0 2.1 V VREFB Reference Bottom (internal) 0.9 1.0 1.1 V VCM Common-Mode Voltage 1.4 1.5 1.6 V VCM Output Current(6) ±50mV Change in Voltage ±2 mA VREFT Reference Top (external) 1.875 V VREFB Reference Bottom (external) 1.125 V External Reference Common-Mode VCM ± 50mV V External Reference Input Current(7) 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) If the offset at temperatures T1 and T2 are O1 and O2, respectively (where O1 and O2 are measured in LSBs), the offset temperature coefficient in ppm/ °C is calculated as (O 1 – O2)/(T1 – T2) × 1E6/4096. (3) Fixed attenuation in the channel arises because of a fixed attenuation in the sample-and-hold amplifier. When the differential voltage at the analog input pins is 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). (4) The reference voltages are trimmed at production so that (VREFT – VREFB) is within ± 35mV of the ideal value of 1V. This specification does not include fixed attenuation. (5) Supply current can be calculated from dividing the power dissipation by the supply voltage of 3.3V. (6) The VCM output current specified is the drive of the VCM buffer if loaded externally. (7) Average current drawn from the reference pins in the external reference mode. 4 Submit Documentation Feedback |
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