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AN314 Datasheet(PDF) 5 Page - Cirrus Logic

Part # AN314
Description  Multiplexing the CS556x/7x/8x Delta-Sigma ADCs
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

AN314 Datasheet(HTML) 5 Page - Cirrus Logic

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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
+
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+
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10k


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