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DAC716P Scheda tecnica(PDF) 6 Page - Texas Instruments |
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DAC716P Scheda tecnica(HTML) 6 Page - Texas Instruments |
6 / 16 page 6 ® DAC716 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 K grade is guaranteed over the specifi- cation temperature range to 15 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 10V and 1LSB. The 1LSB change is mea- sured at the Major Carry (7FFF to 8000, and 8000 to 7FFF: Straight Binary codes), the input transition at which worst- case settling time occurs. TOTAL HARMONIC DISTORTION + NOISE Total harmonic distortion + noise is defined as the ratio of the square root of the sum of the squares of the values of the harmonics and noise to the value of the fundamental fre- quency. 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 8000 to 7FFF. 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 DAC716 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 DAC716 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 block diagram of 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 give an output voltage of 0V (code 0000). LOGIC INPUT COMPATIBILITY DAC716 digital inputs are TTL compatible (1.4V switching level) with low leakage, high impedance inputs. Thus the inputs are suitable for being driven by any type of 5V logic such as 5V CMOS logic. An equivalent circuit of a digital input is shown in Figure 2. Data inputs will float to logic “0” and control 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 DAC716 is designed to accept Straight Binary (SB) input codes. The serial input format is MSB first. INTERNAL REFERENCE DAC716 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 unipolar offset of the converter will vary. OUTPUT VOLTAGE SWING The output amplifier of DAC716 is designed to achieve a +10V output range. DAC716 will provide a +10V output swing while operating on ±11.4V or higher voltage supplies. |
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Descrizione simile - DAC716P |
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