Electronic Components Datasheet Search |
|
DAC729KH Datasheet(PDF) 11 Page - Burr-Brown (TI) |
|
|
DAC729KH Datasheet(HTML) 11 Page - Burr-Brown (TI) |
11 / 12 page DAC729 11 FIGURE 12. Differential Linearity Adjustment Circuit for the 4MSBs. FIGURE 13. 0 to 10V FSR. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 18-Bit DAC V OUT The DAC729 offers superb dynamic range. Dynamic range is a measure of the ratio of the smallest signals the converter can produce to the full-scale range, usually expressed in decibels (dB). The theoretical dynamic range of a converter is approximately 6dB per bit. For the DAC729 the theoreti- cal range is 108dB! The actual dynamic range is limited by noise (signal-to-noise) and linearity errors. The DAC729’s 6 µV typical noise floor, fast settling op amp, and adjustable 18-bit linearity minimize the limitation. Total harmonic distortion (THD) is the measure of the magnitude and distribution of the linearity error, differential linearity error, noise, and quantization error. The THD is defined as the ratio of the square root of the sum of the squares of the harmonics to the values of the input funda- mental frequency. The rms value of a DAC error can be shown to be where n is the number of samples in one cycle of any given sine wave, E L(i) is the linearity error of the DAC729 at each sampling point, and E Q(i) is the quantization error at each sampling point. The THD can then be expressed as where E rms is the rms signal-voltage level. This expression indicates that, in general, there is a correla- tion between the THD and the square root of the sum of the squares of the linearity errors at each digital word of interest. However, this expression does not mean that the worst-case linearity error of the D/A is directly correlated to the THD. The DAC729 has demonstrated THD of 0.0009% at full scale (at 1kHz). This is the level of distortion that is desired to test other professional audio products, making the DAC729 ideal for professional audio test equipment. The ability to adjust the linearity of the 4MSBs, the 18-bit resolution, fast settling and low noise give the DAC729 unmatched performance. AUTOMATIC TEST EQUIPMENT The pin functions of the DAC729 are convenient for use in automatic test equipment systems. The ability to use internal or external reference and internal or external op amp means versatility for the system designer. For example, in auto- matic test systems with several DACs and ADCs, it is desirable to operate all of the high accuracy converters from the same reference, improving the tracking characteristics of those components to one another. The reference in the DAC729 is a very stable precision reference, and is suitable for use as the system reference. Test systems, and other large systems are the ideal applica- tion for a DAC of this accuracy, because the DAC will be calibrated in the environment in which it will be used. Since the environment is very stable, the manual calibration (Fig- ure 12) may be adequate. However, highly automated sys- tems will go to an automatic calibration routine. Replacing n 1 ε RMS = ∑ [E L(i) + EQ(i)] 2 i =1 n 1.0M Ω 100k Ω 0.01µF (1) 36 –V CC 1.0M Ω 100k Ω 0.01µF (1) 37 –V CC 1.0M Ω 100k Ω 0.01µF (1) 38 –V CC 1.0M Ω Bit 1 Adjust 100k Ω 0.01µF (1) 39 V POT 40 –V CC 21 –V CC 150k Ω 150k Ω 150k Ω 150k Ω NOTE: (1) Low leakage film type. Bit 2 Adjust Bit 3 Adjust Bit 4 Adjust THD = = X x 100% E RMS ε RMS E RMS i =1 n 1 n ∑ [E L(i) + EQ(i)] 2 (2) |
Similar Part No. - DAC729KH |
|
Similar Description - DAC729KH |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |