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EVM6435 Datasheet(PDF) 9 Page - Semtech Corporation |
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EVM6435 Datasheet(HTML) 9 Page - Semtech Corporation |
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9 / 40 page  9 TEST AND MEASUREMENT PRODUCTS 2006 Semtech Corp. / Rev. 3, 8/25/06 Edge6435/6436 www.semtech.com Circuit Description (continued) Current Output DACs (Groups C, D) Group C DACs The output current of each Group C Current DAC is a function of an external resistor value (R_IGAIN_C), a reference voltage level (VREF), contents of digital offset and gain registers, and the input code (DATA). The general equation that describes the output current as a function of these variables is presented below as Equation 5: Equation 5. where: IOUT_C is the output current of the Group C Current DAC VREF is an externally applied 2.5V reference voltage R_IGAIN_C is the value of an external resistor that sets the output current range for Group C DACs (60.97K Ω ≤ R_IGAIN_C ≤ 250KΩ) CODE is the base-10 value of the binary code (DATA) loaded into the DAC shift register (see Figures 4 and 5) after it has been modified by the contents of the digitally programmable offset and gain calibraiotn registers as shown in Figure 2. Group D DACs The output current of each group D DAC is a function of an external resistor value (R_IGAIN_D), a reference voltage level (VREF) and the input code (DATA). The general equation that describes the output current as a function of these variables is presented below as Equation 6: Equation 6. where: IOUT_D is the output current of the Group D DAC VREF is an externally applied 2.5V reference voltage IOUT_C = CODE * 8192 50 x VREF R_IGAIN_C IOUT_D = DATA * 64 50 x VREF R_IGAIN_D R_IGAIN_D is the value of an external resistor that sets the output current range for Group D DACs (78.12K Ω ≤ R_IGAIN_D ≤ 156.25KΩ) DATA is the base-10 value of the binary code loaded into the DAC shift register (see Figures 4 and 5). Functional Description Figure 1 provides a Functional Block Diagram. Figures 2 and 3 show details of the data latches and logic for the DACs. The Edge6435/6436 features a serial data input to program a channel or set of channel’s DACs and functions. The Edge6435/6436 also features self- calibrating DAC outputs via internal offset and gain registers (Figure 2). Figures 4 and 5 show the format of the Serial Input Data for 4 pin channel and 8 pin channel formats. Figure 6 shows the Serial Data Programming Sequence Tables 3 and 4 provide the Address Maps for 4 pin channel and 8 pin channel formats. FORMAT FORMAT Low selects the 4 pin channel format. FORMAT High selects the 8 pin channel format. |
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