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DAC8532IDGKG4 Datasheet(PDF) 15 Page - Texas Instruments |
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DAC8532IDGKG4 Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 23 page  15 DAC8532 SBAS246A www.ti.com DRIVING RESISTIVE AND CAPACITIVE LOADS The DAC8532 output stage is capable of driving loads of up to 1000pF while remaining stable. Within the offset and gain error margins, the DAC8532 can operate rail-to-rail when driving a capacitive load. Resistive loads of 2k Ω can be driven by the DAC8532 while achieving a typical load regu- lation of 1%. As the load resistance drops below 2k Ω, the load regulation error increases. When the outputs of the DAC are driven to the positive rail under resistive loading, the PMOS transistor of each Class-AB output stage can enter into the linear region. When this occurs, the added IR voltage drop deteriorates the linearity performance of the DAC. This only occurs within approximately the top 20mV of the DAC’s digital input-to-voltage output transfer characteristic. The reference voltage applied to the DAC8532 may be reduced below the supply voltage applied to VDD in order to eliminate this condition if good linearity is a requirement at full scale (under resistive loading conditions). CROSSTALK AND AC PERFORMANCE The DAC8532 architecture uses separate resistor strings for each DAC channel in order to achieve ultra-low crosstalk performance. DC crosstalk seen at one channel during a full- 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 DAC8532 can achieve typical AC perfor- mance of 96dB SNR (Signal-to-Noise Ratio) and 65db THD (Total Harmonic Distortion), making the DAC8532 a solid choice for applications requiring low SNR at output frequen- cies at or below 4kHz. OUTPUT VOLTAGE STABILITY The DAC8532 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 VDD from appearing at the outputs to well below 10 µV-s. Combined with good DC noise performance and true 16-bit differential linearity, the DAC8532 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 DAC8532 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 DAC8532 is designed in order to support these high update rates. For full-scale output swings, the output stage of each DAC8532 channel typically exhibits less than 100mV of overshoot and undershoot when driving a 200pF capacitive load. Code-to-code change glitches are extremely low (~10uV) given that the code-to-code transition does not cross an Nx4096 code boundary. Due to internal segmen- tation of the DAC8532, code-to-code glitches occur at each crossing of an Nx4096 code boundary. These glitches can approach 100mVs for N = 15, but settle out within ~2 µs. USING REF02 AS A POWER SUPPLY FOR DAC8532 Due to the extremely low supply current required by the DAC8532, a possible configuration is to use a REF02 +5V precision voltage reference to supply the required voltage to the DAC8532'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 DAC8532. If the REF02 is used, the current it needs to supply to the DAC8532 is 567 µA typical and 890 µA max for V DD = 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: 567 µA + (5V/5kΩ) = 1.567mA FIGURE 10. REF02 as a Power Supply to the DAC8532. REF02 DAC8532 3-Wire Serial Interface +5V 1.567mA V DD, VREF V OUT = 0V to 5V SYNC SCLK D IN +15 The load regulation of the REF02 is typically 0.005%/mA, which results in an error of 392 µV for the 1.5mA current drawn from it. This corresponds to a 5.13LSB error for a 0V to 5V output range. BIPOLAR OPERATION USING THE DAC8532 The DAC8532 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, see Figure 11. |
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