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Converter Electrical Characteristics (Continued) The following specifications apply for V + =V A+=VD+ = +5.0 VDC,VREF+ = +4.096 VDC,VREF−=0 VDC, 12-bit + sign conver- sion mode, f CK =fSK = 8 MHz for the ADC12H030, ADC12H032, ADC12H034 and ADC12H038, fCK =fSK = 5 MHz for the ADC12030, ADC12032, ADC12034 and ADC12038, R S =25 Ω, source impedance for V REF+ and VREF− ≤ 25Ω, fully-differential input with fixed 2.048V common-mode voltage, and 10(t CK) acquisition time unless otherwise specified. Boldface limits apply for T Symbol Parameter Conditions Typical Limits Units (Limits) STATIC CONVERTER CHARACTERISTICS +INL Positive Integral Linearity Error 8-bit + sign mode (Note 12) ±1/2 LSB (max) −INL Negative Integral Linearity Error 8-bit + sign mode (Note 12) ±1/2 LSB (max) DNL Differential Non-Linearity 8-bit + sign mode ±3/4 LSB (max) Positive Full-Scale Error 8-bit + sign mode (Note 12) ±1/2 LSB (max) Negative Full-Scale Error 8-bit + sign mode (Note 12) ±1/2 LSB (max) Offset Error 8-bit + sign mode, after Auto-Zero (Note 13) ±1/2 LSB (max) V IN(+)=VIN(−) = + 2.048V TUE Total Unadjusted Error 8-bit + sign mode after Auto-Zero ±3/4 LSB (max) (Notes 12, 13, 14) Multiplexer Channel to Channel Matching ±0.05 LSB Power Supply Sensitivity V + = +5V ±10% V REF = +4.096V Offset Error ±0.5 ±1 LSB (max) + Full-Scale Error ±0.5 ±1.5 LSB (max) − Full-Scale Error ±0.5 ±1.5 LSB (max) + Integral Linearity Error ±0.5 LSB − Integral Linearity Error ±0.5 LSB Output Data from +10 LSB (max) “12-Bit Conversion of Offset” −10 LSB (min) (see Table 5) Output Data from 4095 LSB (max) “12-Bit Conversion of Full-Scale” 4093 LSB (min) (see Table 5) UNIPOLAR DYNAMIC CONVERTER CHARACTERISTICS S/(N+D) Signal-to-Noise Plus f IN = 1 kHz, VIN =5 VPP,VREF + = 5.0V 69.4 dB Distortion Ratio f IN = 20 kHz, VIN =5 VPP,VREF + = 5.0V 68.3 dB f IN = 40 kHz, VIN =5 VPP,VREF+ = 5.0V 65.7 dB −3 dB Full Power Bandwidth V IN =5 VPP, where S/(N+D) drops 3 dB 31 kHz DIFFERENTIAL DYNAMIC CONVERTER CHARACTERISTICS S/(N+D) Signal-to-Noise Plus f IN = 1 kHz, VIN = ±5V, VREF + = 5.0V 77.0 dB Distortion Ratio f IN = 20 kHz, VIN = ±5V, VREF + = 5.0V 73.9 dB f IN = 40 kHz, VIN = ±5V, VREF + = 5.0V 67.0 dB −3 dB Full Power Bandwidth V IN = ±5V, where S/(N+D) drops 3 dB 40 kHz REFERENCE INPUT, ANALOG INPUTS AND MULTIPLEXER CHARACTERISTICS C REF Reference Input Capacitance 85 pF C A/D A/DIN1 and A/DIN2 Analog 75 pF Input Capacitance A/DIN1 and A/DIN2 Analog V IN = +5.0V or ±0.1 ±1.0 µA (max) Input Leakage Current V IN =0V CH0–CH7 and COM GND − 0.05 V (min) Input Voltage V A+ + 0.05 V (max) www.national.com 6 |
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