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ES51999 Datasheet(PDF) 14 Page - Cyrustek corporation

Part No. ES51999
Description  4 3/4 and 5 3/4 A/D AUTO
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Maker  CYRUSTEK [Cyrustek corporation]
Homepage  http://www.cyrustek.com.tw
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ES51999 Datasheet(HTML) 14 Page - Cyrustek corporation

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07/07/06
14
ES51999
4 3/4 and 5 3/4 A/D AUTO
(7) Multiplying by 10 (X10) Function
ES51999 includes X10 function. In X10 function mode, the output will be increasing
tenfold. But the input range will be reduced to ±44mV. For example, if X10 function is
enabled and the input is 10mV, output will be 10,000 counts, rather than 1,000 counts. To
achieve X10 function, the integration resistor is 20K
Ω, not 200KΩ at INT phase, and
remains 200 k
Ω at DINT phase. Because the resistor (20KΩ) requires exactly 1/10 of
integration resistor (200K
Ω), a variable resistor Rx is used to compensate these two
resisters.
Resistor scheme of AZ/INT/DINT phases
In ES51999, an on-chip resistor is used for AZ mode. The internal chip is about 10 k
Ω.
The connection is shown in the following Figure 5.2.
The status of switches A, B and C are described in the following table.
Figure 5.1 X10 function
BUF(7)
Rx
20K
200K
Figure 5.2 Resistor scheme of AZ phase
BUFX10(8)
RAZ(9)
10K
ES51999
A
B
C
CINT(5)
CAZ(6)
BUF
BUFX10
VR
18K
200K


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