CS5571

28

DS768PP1

3/25/08

10:56

At the same time the converter is performing a conversion on a channel from one bank of multiplexers,

the second multiplexer bank is used to select the channel for the next conversion. This configuration al-

lows the buffer amplifier for the second multiplexer bank to fully settle while a conversion is being per-

formed on the channel from the first multiplexer bank. The multiplexer on the output of the buffer amplifier

and the CONV signal can be changed at the same time in this configuration. This multiplexing architec-

ture allows for maximum multiplexing throughput from the A/D converter. The following figure depicts the

recommended analog input amplifier circuit.

Figure 28. More Complex Multiplexing Scheme

CONV

Convert on CH1

Convert on CH1

Convert on CH4

Convert on CH3

Convert on CH2

Select A1

Select A2

Select A1

Select A2

Select CH1

Select CH3

Select CH1

Select A1

Select CH2

Select CH4

Select CH2

SW1

SW2

SW3

CS5571

AIN

ACOM

90

150pF

2k

4700pF

C0G

90

150pF

2k

CH1

CH3

CH2

CH4

SW2

SW3

SW1

A2

A1

4700pF

C0G