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MAX5115 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX5115 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page Nonvolatile, Quad, 8-Bit DACs with 2-Wire Serial Interface ______________________________________________________________________________________ 11 Detailed Description The MAX5115/MAX5116 8-bit DACs feature internal, nonvolatile registers that store the DAC states for initial- ization during power-up. These devices consist of resis- tor-string DACs, rail-to-rail output buffers, a shift register, power-on reset (POR) circuitry, and volatile and nonvolatile memory registers (Figures 1 and 2). The shift register decodes the control and address bits, routing the data to the proper registers. Writing data to a selected volatile register immediately updates the DAC outputs. The volatile registers retain data as long as the device is powered. Removing power clears the volatile regis- ters. The nonvolatile registers retain data even after power is removed. On startup, when power is first applied, data from the nonvolatile registers is trans- ferred to the volatile registers to automatically initialize the device. Read data from the nonvolatile or volatile registers using the 2-wire serial interface. DAC Operation The MAX5115/MAX5116 use a DAC matrix decoding architecture that saves power. A resistor string divides the difference between the external reference voltages, VREFH_ and VREFL_. Row and column decoders select the appropriate tap from the resistor string, providing the equivalent analog voltage. The resistor string pre- sents a code-independent input impedance to the ref- erence and guarantees a monotonic output. Figure 3 shows a simplified diagram of one DAC. Output Buffer Amplifiers The MAX5115/MAX5116 analog outputs are internally buffered by a precision unity-gain amplifier. The outputs swing from GND to VDD with a VREFL_-to-VREFH_ output transition. The amplifier outputs typically settle to ±0.5 LSB in 8µs when loaded with 5k Ω in parallel with 100pF. DAC Registers The MAX5115/MAX5116 feature two registers per DAC, a volatile and a nonvolatile register, that store the DAC data. The volatile DAC register holds the current value of each DAC. Write data to the volatile registers directly from the 2-wire serial interface or by loading the previ- ously stored data from the respective nonvolatile regis- ter. Clear the volatile registers by removing power to the device. The volatile registers are read/write. The nonvolatile register retains the DAC values even after power is removed. Read stored data using the 2- wire serial interface. On power-up, the devices auto- matically initialize with data stored in the nonvolatile registers. The nonvolatile registers are read/write and programmed to all zeros at the factory. REFH_ REFL_ R1 R15 R16 R255 R0 D7 D6 D5 D4 DAC D3 D0 D2 D1 LSB DECODER Figure 3. DAC Simplified Circuit Diagram |
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