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AFE0064IPBK Datasheet(PDF) 11 Page - Texas Instruments |
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AFE0064IPBK Datasheet(HTML) 11 Page - Texas Instruments |
11 / 31 page AFE0064 www.ti.com ........................................................................................................................................................................................ SLAS672 – SEPTEMBER 2009 As explained before the device samples the integrator output twice, Reset sample ( SHR) and Signal sample (SHS). VOUTM = REFM + (VSHS – VSHR) VOUTP = REFP – (VSHS – VSHR) Case 2: (Integrator down mode, INTUPz = 1) As explained before the device samples the integrator output twice, Reset sample ( SHR) and Signal sample (SHS). VOUTM = REFP + (VSHS – VSHR) VOUTP = REFM – (VSHS – VSHR) The differential output from the AFE0064 rejects common-mode noise from the board helping to maximize noise performance of the system. The following table provides details of integrator feedback ranges, feedback capacitor, and corresponding AFE0064 output at zero and full scale input charge. Table 1. AFE0064 Range Selection to Device Analog Output Mapping REFP 2.25 REFP-REFM 1.4 REFM 0.85 INTEGRATE UP MODE INTEGRATE DOWN MODE (INTUPz=0), e– counting (INTUPz=1), hole+ counting At 0 charge I/p At FS charge I/p At 0 charge I/p At FS charge I/p Typical FS Int FB Cap= (Qr)/ Range Charge Range (REFP-REFM) OUTP OUTM OUTP OUTM OUTP OUTM OUTP OUTM (Qr) pC … pF 0 0.13 0.0929 1 0.25 0.1786 2 0.5 0.3571 3 1.2 0.8571 2.25 0.85 0.85 2.25 0.85 2.25 2.25 0.85 4 2.4 1.7143 5 4.8 3.4286 6 7.2 5.1429 7 9.6 6.8571 The following section provides detailed timing of data read. There are two output drivers. Data for channel number 63 to 32 is available on output driver 1 and data for channel number 31 to 0 is available on output driver 0. Data from two drivers can be available simultaneously or sequentially depending on the status of pin SMT_MD. Figure 5. Device Data Read in Sequential Mode (SMT_MD = 0) Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s) :AFE0064 |
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