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MAX5360 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX5360 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Low-Cost, Low-Power 6-Bit DACs with 2-Wire Serial Interface in SOT23 Package 8 _______________________________________________________________________________________ Detailed Description The MAX5360/MAX5361/MAX5362 voltage-output, 6-bit DACs offer full 6-bit performance with less than 1LSB integral nonlinearity (INL) error and less than 1LSB dif- ferential nonlinearity (DNL) error ensuring monotonic performance. The devices use a simple two-wire, fast- mode I2C-compatible serial interface that operates up to 400kHz. The MAX5360/MAX5361/MAX5362 include an internal reference, an output buffer, and low-current shutdown mode, making them ideal for low-power, highly integrated applications. Figure 1 shows the devices’ functional diagram. Analog Section The MAX5360/MAX5361/MAX5362 employ a current- steering DAC topology as shown in Figure 2. At the core of the DAC is a reference voltage-to-current con- verter (V/I) that generates a reference current. This cur- rent is mirrored to 255 equally weighted current sources. DAC switches control the outputs of these cur- rent mirrors, so only the desired fraction of the total cur- rent-mirror currents is steered to the DAC output. The current is then converted to a voltage across a resistor, and this voltage is buffered by the output buffer amplifier. Output Voltage Table 1 shows the relationship between the DAC code and the analog output voltage. The 6-bit DAC code is binary unipolar with 1LSB = (VREF / 64). The MAX5360/ MAX5361 have a full-scale output voltage of (+2V - 1LSB) and (+4V - 1LSB), respectively, set by the inter- nal references. The MAX5362 has a full-scale output voltage of (0.9 VDD - 1LSB). Each device accepts 8-bit DAC codes, but the accuracy is guaranteed only for 6 bits. Output Buffer The DAC voltage output is an internally buffered unity- gain follower that typically slews at ±0.4V/µs. The out- put can swing from 0 to full scale. With a 1/4 FS to 3/4 FS output transition, the amplifier outputs typically settle to 1/2LSB in less than 5µs when loaded with 10k Ω in parallel with 50pF. The buffer amplifiers are stable with any combination of resistive loads >10k Ω and capaci- tive loads <50pF. VREF OUT SW1 SW2 SW255 Figure 2. Current-Steering Topology VDD OUT 10k GND SDA SCL 255 6 + 2 CURRENT- STEERING DAC DATA LATCH SERIAL INPUT REGISTER CONTROL LOGIC MAX5360 MAX5361 MAX5362 REF Figure 1. Functional Diagram Table 1. Unipolar Code Current 000001 (00) 0.9 VDD / 64 62mV 31mV 000000 (00) 0 0 0 100000 (00) 0.9 VDD / 2 2V 1V 111111 (00) 0.9 VDD (63/64) 4V (63/64) 2V (63/64) MAX5362 MAX5361 MAX5360 DAC CODE 6 BITS + 2 SUBBITS OUTPUT VOLTAGE |
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