AD2S1205: 68K resistors in AD2S1205 recommended circuit diagram

Question

Accepted Answer

Q 
 I have a question about the datasheet of AD2S1205 and AD2S1210. In the datasheet of AD2S1205, we recommend 68K resistors between SIN/SINLO and COS/COSLO. The function of these two 68K resistors is explained in the datasheet, too. (See attached Figure 1, Figure 2, Figure 3). But, in the datasheet of AD2S1210, there are no such resistors. Are they integrated into the internal chip or other reasons? (Figure 4, attached document)? 
 
 A 
 The 68K resistors are not required in the AD2S1210 to detect an all connection LOS. These resistors are not integrated into the device, there are some very subtle changes in the internal fault detection circuitry to ensure the fault is detected in the AD2S1210 without the need for the additional resistors. 
 
 Attachments: 
 
 68KresistorsinAD2S1205diagram.docx

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AD2S1205: FAQ