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AN314 Datasheet(PDF) 5 Page - Cirrus Logic |
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AN314 Datasheet(HTML) 5 Page - Cirrus Logic |
5 / 10 page ![]() AN314REV1 5 AN314 of approximately 6 dB in the full-scale signal-to-noise ratio. This is because the full-scale input range of the differ- ential input devices is twice that of the single ended devices. For example the CS5560/70/80 has a differential input range of 8.192 volts (±4.096) while the CS5561/71/81 has a full-scale input range of 4.096 volts (±2.048). For an equivalent internal noise, this means the full-scale input-to-noise ratio improves by 6 dB when using the differential input devices. Of course, in order to take advantage of the differential device, the signal being converted needs to be a true differential signal that utilizes the full-scale range. Otherwise, a single-ended-to-differential conversion cir- cuit would need to be designed using a low-noise op-amp such as illustrated in Figure 5. Figure 5. Single-ended-to-differential Conversion Circuit If the decision is made to use a differential input ADC then the MUX will need to be a dual-pole device. Otherwise, for simpler implementations with less stringent noise performance requirements, a single-ended input device can be used with a single-pole MUX. ±10.107 V Single Ended Input ±4.096 V Differential Output ½ CS3004 20k 88.7k 20k 20k ½ CS3004 + - + - 10k |
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Similar Description - AN314 |
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