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DAC8534IPWRG4 Datasheet(PDF) 17 Page - Texas Instruments |
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DAC8534IPWRG4 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 24 page  17 DAC8534 SBAS254D www.ti.com FIGURE 11. Bipolar Operation with the DAC8534. DAC8534 (Other pins omitted for clarity.) AV DD, VREF V OUTX R 1 10k Ω R 2 10k Ω +5V 10 µF 0.1 µF - 5V ±5V +5V OPA703 FIGURE 10. REF02 as a Power Supply to the DAC8534. REF02 DAC8534 3-Wire Serial Interface +5V AV DD, VREF V OUT = 0V to 5V SYNC SCLK D IN +15 AI DD + IREF scale change on the neighboring channel is typically less than 0.5LSBs. The AC crosstalk measured (for a full-scale, 1kHz sine wave output generated at one channel, and measured at the remaining output channel) is typically under –100dB. In addition, the DAC8534 can achieve typical AC perfor- mance of 96dB SNR (Signal-to-Noise Ratio) and 65dB THD (Total Harmonic Distortion), making the DAC8534 a solid choice for applications requiring high SNR at output frequen- cies at or below 4kHz. OUTPUT VOLTAGE STABILITY The DAC8534 exhibits excellent temperature stability of 5ppm/ °C typical output voltage drift over the specified tem- perature range of the device. This enables the output voltage of each channel to stay within a ±25µV window for a ±1°C ambient temperature change. Good Power-Supply Rejection Ratio (PSRR) performance reduces supply noise present on AVDD from appearing at the outputs to well below 10 µV-s. Combined with good DC noise performance and true 16-bit differential linearity, the DAC8534 becomes a perfect choice for closed-loop control applica- tions. SETTLING TIME AND OUTPUT GLITCH PERFORMANCE Settling time to within the 16-bit accurate range of the DAC8534 is achievable within 10 µs for a full-scale code change at the input. Worst-case settling times between consecutive code changes is typically less than 2 µs, en- abling update rates up to 500ksps for digital input signals changing code-to-code. The high-speed serial interface of the DAC8534 is designed in order to support these high update rates. For full-scale output swings, the output stage of each DAC8534 channel typically exhibits less than 100mV of overshoot and undershoot when driving a 200pF capacitive load. Code-to-code change glitches are extremely low given that the code-to-code transition does not cross an Nx4096 code boundary. Due to internal segmentation of the DAC8534, code-to-code glitches occur at each crossing of an Nx4096 code boundary. These glitches can approach 100nVs for N = 15, but settle out within ~2 µs. USING THE REF02 AS A POWER SUPPLY FOR THE DAC8534 Due to the extremely low supply current required by the DAC8534, a possible configuration is to use a REF02 +5V precision voltage reference to supply the required voltage to the DAC8534's supply input as well as the reference input, as shown in Figure 10. This is especially useful if the power supply is quite noisy or if the system supply voltages are at some value other than 5V. The REF02 will output a steady supply voltage for the DAC8534. If the REF02 is used, the current it needs to supply to the DAC8534 is 1.085mA typical and 1.78mA max for AVDD = 5V. When a DAC output is loaded, the REF02 also needs to supply the current to the load. The total typical current required (with a 5k Ω load on a given DAC output) is: 1.085mA + (5V/ 5k Ω) = 2.085mA BIPOLAR OPERATION USING THE DAC8534 The DAC8534 has been designed for single-supply opera- tion, but a bipolar output range is also possible using the circuit in Figure 11. The circuit shown will give an output voltage range of ±V REF. Rail-to-rail operation at the amplifier output is achievable using an amplifier such as the OPA703, as shown in Figure 11. |
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Similar Description - DAC8534IPWRG4 |
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