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DAC715ULG4 데이터시트(PDF) 6 Page - Texas Instruments |
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DAC715ULG4 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 14 page 6 ® DAC715 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 DAC715 is guaranteed over the specifica- tion temperature range to 13-, 14-, 15-, and 16-bits for performance grades DAC715P/U, DAC715PB/UB, DAC715PK/UK, and DAC715PL/UL respectively. 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 (FFFF H to 0000H, and 0000H to FFFF H: 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 f S. 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, f S. 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 FFFF H to 0000H. DIGITAL FEEDTHROUGH When the D/A 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 DAC715 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 micropro- cessor bus interface. INTERFACE LOGIC The DAC715 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 give a half scale output. LOGIC INPUT COMPATIBILITY The DAC715 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 logic. 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 DAC715 is designed to accept binary two’s comple- ment (BTC) input codes. For unipolar analog output con- figuration, a digital input of 7FFF H gives a full scale output, 8000 H gives a zero output, and 0000H gives half scale output. INTERNAL REFERENCE The DAC715 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 of the converter will vary. OUTPUT VOLTAGE SWING The output amplifier of the DAC715 is committed to a 0 to +10V output range. It will provide a 0 to +10V output swing while operating on ±11.4V or higher voltage supplies. |
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