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ADG3249BRJ-R2 Datasheet(PDF) 9 Page - Analog Devices |
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ADG3249BRJ-R2 Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page REV. 0 ADG3249 –9– BUS SWITCH APPLICATIONS Mixed Voltage Operation, Level Translation Bus switches can provide an ideal solution for interfacing between mixed voltage systems. The ADG3249 is suitable for applications where voltage translation from 3.3 V technology to a lower voltage technology is needed. This device can translate from 2.5 V to 1.8 V, or bidirectionally from 3.3 V directly to 2.5 V. Figure 4 shows a block diagram of a typical application in which a user needs to interface between a 3.3 V ADC and a 2.5 V microprocessor. The microprocessor may not have 3.3 V toler- ant inputs, therefore placing the ADG3249 between the two devices allows the devices to communicate easily. The bus switch directly connects the two blocks, thus introducing minimal propagation delay, timing skew, or noise. 3.3V ADC 2.5V 3.3V 2.5V MICROPROCESSOR 3.3V Figure 4. Level Translation between a 3.3 V ADC and a 2.5 V Microprocessor 3.3 V to 2.5 V Translation When VCC is 3.3 V (SEL = 3.3 V) and the input signal range is 0 V to VCC, the maximum output signal will be clamped to within a voltage threshold below the VCC supply. In this case, the output will be limited to 2.5 V, as shown in Figure 6. This device can be used for translation from 2.5 V to 3.3 V devices and also between two 3.3 V devices. ADG3249 2.5V 2.5V 3.3V 2.5V 3.3V Figure 5. 3.3 V to 2.5 V Voltage Translation, SEL = V CC VIN 2.5V VOUT 0V 3.3V SWITCH INPUT 3.3V SUPPLY SEL = 3.3V Figure 6. 3.3 V to 2.5 V Voltage Translation, SEL = V CC 2.5 V to 1.8 V Translation When VCC is 2.5 V (SEL = 2.5 V) and the input signal range is 0 V to VCC, the maximum output signal will, as before, be clamped to within a voltage threshold below the VCC supply. In this case, the output will be limited to approximately 1.8 V, as shown in Figure 8. ADG3249 1.8V 2.5V 2.5V Figure 7. 2.5 V to 1.8 V Voltage Translation, SEL = 2.5 V CC VIN 1.8V VOUT 0V 2.5V SWITCH INPUT 2.5V SUPPLY SEL = 2.5V Figure 8. 2.5 V to 1.8 V Voltage Translation, SEL = V CC 3.3 V to 1.8 V Translation The ADG3249 offers the option of interfacing between a 3.3 V device and a 1.8 V device. This is possible through use of the SEL pin. The SEL pin is an active low control pin. SEL acti- vates internal circuitry in the ADG3242 that allows voltage translation between 3.3 V devices and 1.8 V devices. When VCC is 3.3 V and the input signal range is 0 V to VCC, the maximum output signal will be clamped to 1.8 V, as shown in Figure 9. To do this, the SEL pin must be tied to Logic 0. If SEL is unused, it should be tied directly to V CC. ADG3249 1.8V 3.3V 3.3V Figure 9. 3.3 V to 1.8 V Voltage Translation, SEL = 0 V VIN 1.8V VOUT 0V 3.3V SWITCH INPUT 3.3V SUPPLY SEL = 0V Figure 10. 3.3 V to 1.8 V Voltage Translation, SEL = 0 V |
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