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LM12454 Datasheet(PDF) 6 Page - Texas Instruments |
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LM12454 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 45 page LM12454, LM12458, LM12H458 SNAS079A – MAY 2004 – REVISED FEBRUARY 2006 www.ti.com Converter Characteristics (1) (2) (3) (4) The following specifications apply to the LM12454, LM12458, and LM12H458 for VA+ = VD+ = 5V, VREF+ = 5V, VREF− = 0V, 12- bit + sign conversion mode, fCLK = 8.0 MHz (LM12H458) or fCLK = 5.0 MHz (LM12454/8), RS = 25Ω, source impedance for VREF+ and VREF− ≤ 25Ω, fully-differential input with fixed 2.5V 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. Symbol Parameter Conditions Typical (5) Limits (6) Units ILE Integral Linearity Error (7) (8) After Auto-Cal ±1/2 ±1 LSB (max) TUE Total Unadjusted Error(7) After Auto-Cal ±1 LSB Resolution with No Missing Codes (7) After Auto-Cal 13 Bits (max) DNL Differential Non-Linearity After Auto-Cal ±¾ LSB (max) After Auto-Cal ±1 Zero Error (9) (8) LM12H458 ±1/2 ±1.5 LSB (max) Positive Full-Scale Error (7) (8) After Auto-Cal ±1/2 ±2 LSB (max) Negative Full-Scale Error (7) (8) After Auto-Cal ±1/2 ±2 LSB (max) DC Common Mode Error (10) ±2 ±3.5 LSB (max) 8-Bit + Sign and “Watchdog” Mode ILE ±1/2 LSB (max) Integral Linearity Error (7) 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 Resolution 9 Bits (max) with No Missing Codes 8-Bit + Sign and “Watchdog” Mode DNL ±3/4 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 ±1/8 LSB DC 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) V (min) GND V (max) Common Mode Input Voltage Range VA+ (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 LM12454 or the LM12(H)458. 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 4.5 VDC, full-scale input voltage must be ≤4.6 VDC to ensure accurate conversions. (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 guaranteed when operating at fCLK = 5 MHz for the LM12454/8 and fCLK = 8 MHz for the LM12H458. (4) With the test condition for VREF (VREF+ − VREF−) given as +5V, the 12-bit LSB is 1.22 mV and the 8-bit/“Watchdog” LSB is 19.53 mV. (5) Typical figures are at TA = 25°C and represent most likely parametric norm. (6) Limits are 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 6 Figure 7). (8) The LM12(H)454/8'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 8). (10) The DC common-mode error is measured with both inputs shorted together and driven from 0V to 5V. The measured value is referred to the resulting output value when the inputs are driven with a 2.5V signal. 6 Submit Documentation Feedback Copyright © 2004–2006, Texas Instruments Incorporated Product Folder Links: LM12454 LM12458 LM12H458 |
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