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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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DAC714PG4 Fiches technique(PDF) 6 Page - Texas Instruments |
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DAC714PG4 Fiches technique(HTML) 6 Page - Texas Instruments |
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6 / 22 page  DAC714 6 SBAS032A www.ti.com DISCUSSION OF SPECIFICATIONS LINEARITY ERROR Linearity error is defined as the deviation of the analog output from a straight line drawn between the end points of the transfer characteristic. DIFFERENTIAL LINEARITY ERROR Differential linearity error (DLE) is the deviation from 1LSB of an output change from one adjacent state to the next. A DLE specification of ±1/2LSB means that the output step size can range from 1/2LSB to 3/2LSB when the digital input code changes from one code word to the adjacent code word. If the DLE is more positive than –1LSB, the D/A is said to be monotonic. MONOTONICITY A D/A converter is monotonic if the output either increases or remains the same for increasing digital input values. Monotonicity of the C and L grades is assured over the specification temperature range to 16 bits. SETTLING TIME Settling time is the total time (including slew time) for the D/A output to settle to within an error band around its final value after a change in input. Settling times are specified to within ±0.003% of Full Scale Range (FSR) for an output step change of 20V and 1LSB. The 1LSB change is mea- sured at the Major Carry (FFFFH to 0000H, and 0000H to FFFFH: BTC codes), the input transition at which worst-case settling time occurs. TOTAL HARMONIC DISTORTION Total harmonic distortion is defined as the ratio of the square root of the sum of the squares of the values of the harmonics to the value of the fundamental frequency. It is expressed in % of the fundamental frequency amplitude at sampling rate fS. SIGNAL-TO-NOISE AND DISTORTION RATIO (SINAD) SINAD includes all the harmonic and outstanding spurious components in the definition of output noise power in addition to quantizing and internal random noise power. SINAD is expressed in dB at a specified input frequency and sampling rate, fS. DIGITAL-TO-ANALOG GLITCH IMPULSE The amount of charge injected into the analog output from the digital inputs when the inputs change state. It is mea- sured at half scale at the input codes where as many as possible switches change state—from 0000H to FFFFH. DIGITAL FEEDTHROUGH When the A/D is not selected, high frequency logic activity on the digital inputs is coupled through the device and shows up as output noise. This noise is digital feedthrough. OPERATION The DAC714 is a monolithic integrated-circuit 16-bit D/A converter complete with 16-bit D/A switches and ladder network, voltage reference, output amplifier and a serial interface. INTERFACE LOGIC The DAC714 has double-buffered data latches. The input data latch holds a 16-bit data word before loading it into the second latch, the D/A latch. This double-buffered organiza- tion permits simultaneous update of several D/A converters. All digital control inputs are active low. Refer to the block diagram shown in Figure 1. All latches are level-triggered. Data present when the enable inputs are logic “0” will enter the latch. When the enable inputs return to logic “1”, the data is latched. The CLR input resets both the input latch and the D/A latch to 0000H (midscale). LOGIC INPUT COMPATIBILITY The DAC714 digital inputs are TTL compatible (1.4V switch- ing level), low leakage, and high impedance. Thus, the inputs are suitable for being driven by any type of 5V logic family, such as CMOS. An equivalent circuit for the digital inputs is shown in Figure 2. The inputs will float to logic “0” if left unconnected. It is recommended that any unused inputs be connected to DCOM to improve noise immunity. Digital inputs remain high impedance when power is off. INPUT CODING The DAC714 is designed to accept binary two’s comple- ment (BTC) input codes with the MSB first which are compatible with bipolar analog output operation. For this configuration, a digital input of 7FFFH produces a plus full scale output, 8000H produces a minus full scale output, and 0000H produces bipolar zero output. INTERNAL REFERENCE The DAC714 contains a +10V reference. The reference output may be used to drive external loads, sourcing up to 2mA. The load current should be constant; otherwise, the gain and bipolar offset of the converter will vary. |
Numéro de pièce similaire - DAC714PG4 |
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Description similaire - DAC714PG4 |
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