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DAC1280IPWR Datasheet(PDF) 11 Page - Texas Instruments |
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DAC1280IPWR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 24 page  Tap Control Current Taps Common-Mode Current DAC1280 IOUTP IOUTN GAIN0 GAIN1 GAIN2 PWDN VREF RREF SYNC AVSS TDATA CLK DGND DVDD AVDD Reference Current Control D D POR Reset Reset Reset 4-bit Counter CLK/16 Divider DAC1280 www.ti.com SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 DAC1280 OVERVIEW The DAC1280 is a high-accuracy digital-to-analog The current-steering stage switches the tap current to converter (DAC) that provides outstanding THD either output, IOUTP or IOUTN, as a result of the performance together with low noise. The DAC1280 sampling of TDATA. A higher 1s density directs more is suitable for the demanding requirements of energy current toward IOUTP and less to IOUTN. exploration and precision instrumentation where a Conversely, a higher density of 0s directs more low-distortion test signal is needed. current to IOUTN than to IOUTP. Steering of the output current yields an average output proportional Figure 26 shows the DAC1280 block diagram. The to the 1s density input. DAC provides a signal output proportional to a 1s density input. The DAC design is a multi-tap, An integrated power-on-reset (POR) function resets current-steering filter that provides a differential the current taps, resulting in a zero differential output current output. An external current-to-voltage (I-V) signal at power-up. The active low PWDN input converter is required to provide a voltage output. VREF powers down the device to a low-power (mW) state. and RREF program the full-scale current, and The SYNC input synchronizes the DAC1280 TDATA GAIN[2:0] pins set the output range. sampling. VREF and RREF establish an internal current that is mirrored to a multi-tap, current-steering filter stage through a reference current control block. The output of the control block is set by the GAIN[2:0] inputs, which fix the weighted tap currents in one of seven ranges. The magnitude of the tap currents results in the maximum differential output current ranges of 1250mA to the lowest range of 19.5mA. Figure 26. DAC1280 Block Diagram Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): DAC1280 |
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