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LM12L458CIV Datasheet(PDF) 4 Page - Texas Instruments |
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LM12L458CIV Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 38 page  LM12L458 SNAS085B – JULY 1999 – REVISED MARCH 2013 www.ti.com Converter Characteristics The following specifications apply for VA+ = VD+ = +3.3V, VREF+ = +2.5V, VREF− = 0V, 12-bit + sign conversion mode, fCLK = 6.0 MHz, RS = 25Ω, source impedance for VREF+ and VREF− ≤ 25Ω, fully-differential input with fixed 1.25V common-mode voltage, and minimum acquisition time unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C (1) (2) (3) (4) Symbol Parameter Conditions Typical(5) Limits(6) Units ILE Integral Linearity Error After Auto-Cal(7)(8) ±1/2 ±1 LSB (max) TUE Total Unadjusted Error After Auto-Cal(7) ±1 LSB Resolution with No Missing Codes After Auto-Cal(7) 13 Bits (max) DNL Differential Non-Linearity After Auto-Cal ±1 LSB (max) Zero Error After Auto-Cal(9) (8) ±1/4 ±1 LSB (max) Positive Full-Scale Error After Auto-Cal (7)(8) ±1/2 ±3 LSB (max) Negative Full-Scale Error After Auto-Cal (7)(8) ±1/2 ±3 LSB (max) DC Common Mode Error See(10) ±2 ±4 LSB (max) 8-Bit + Sign and “Watchdog” Mode Integral ILE See(7) ±1/2 LSB (max) Linearity Error 8-Bit + Sign and “Watchdog” Mode Total TUE After Auto-Zero ±1/2 ±3/4 LSB (max) Unadjusted Error 8-Bit + Sign and “Watchdog” Mode 9 Bits (max) Resolution with No Missing Codes 8-Bit + Sign and “Watchdog” Mode DNL ±1 LSB (max) Differential Non-Linearity 8-Bit + Sign and “Watchdog” Mode Zero After Auto-Zero ±1/2 LSB (max) Error 8-Bit + Sign and “Watchdog” Full-Scale ±1/2 LSB (max) Error 8-Bit + Sign and “Watchdog” Mode DC ±1/8 LSB Common Mode Error Multiplexer Channel-to-Channel Matching ±0.05 LSB GND V (min) VIN+ Non-Inverting Input Range VA+ V (max) GND V (min) VIN− Inverting Input Range VA+ V (max) −VA + V (min) VIN+ − VIN− Differential Input Voltage Range VA+ V (max) GND V (min) Common Mode Input Voltage Range VA+ V (max) (1) Two on-chip diodes are tied to each analog input through a series resistor, as shown below. Input voltage magnitude up to 5V above VA+ or 5V below GND will not damage the LM12L458. However, errors in the A/D conversion can occur if these diodes are forward biased by more than 100 mV. As an example, if VA+ is 3.0 VDC, full-scale input voltage must be =3.1 VDC to ensure accurate conversions. See Figure 3 (2) VA+ and VD+ must be connected together to the same power supply voltage and bypassed with separate capacitors at each V + pin to assure conversion/comparison accuracy. (3) Accuracy is ensured when operating at fCLK = 6 MHz. (4) With the test condition for VREF = VREF+ - VREF-given as +2.5V, the 12-bit LSB is 305 µV and the 8-bit/“Watchdog” LSB is 4.88 mV. (5) Typical figures are at TA = 25°C and represent most likely parametric norm. (6) Limits are specified to AOQL (Average Output Quality Level). (7) Positive integral linearity error is defined as the deviation of the analog value, expressed in LSBs, from the straight line that passes through positive full-scale and zero. For negative integral linearity error the straight line passes through negative full-scale and zero. (See Figure 10 and Figure 11). (8) The LM12L458's self-calibration technique ensures linearity and offset errors as specified, but noise inherent in the self-calibration process will result in a repeatability uncertainty of ±0.10 LSB. (9) Zero error is a measure of the deviation from the mid-scale voltage (a code of zero), expressed in LSB. It is the worst-case value of the code transitions between -1 to 0 and 0 to +1 (see Figure 12). (10) The DC common-mode error is measured with both inputs shorted together and driven from 0V to +2.5V. The measured value is referred to the resulting output value when the inputs are driven with a 1.25V signal. 4 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM12L458 |
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