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LTC6990HS6-TRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC6990HS6-TRPBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 28 page LTC6990 11 6990p Table 1. DIVCODE Programming DIVCODE Hi-Z NDIV Recommended fOUT R1 (k) R2 (k) VDIV/V+ 0 0 1 62.5kHz to 1MHz Open Short ≤ 0.03125 ±0.015 1 0 2 31.25kHz to 500kHz 976 102 0.09375 ±0.015 2 0 4 15.63kHz to 250kHz 976 182 0.15625 ±0.015 3 0 8 7.813kHz to 125kHz 1000 280 0.21875 ±0.015 4 0 16 3.906kHz to 62.5kHz 1000 392 0.28125 ±0.015 5 0 32 1.953kHz to 31.25kHz 1000 523 0.34375 ±0.015 6 0 64 976.6Hz to 15.63kHz 1000 681 0.40625 ±0.015 7 0 128 488.3Hz to 7.813kHz 1000 887 0.46875 ±0.015 8 1 128 488.3Hz to 7.813kHz 887 1000 0.53125 ±0.015 9 1 64 976.6Hz to 15.63kHz 681 1000 0.59375 ±0.015 10 1 32 1.953kHz to 31.25kHz 523 1000 0.65625 ±0.015 11 1 16 3.906kHz to 62.5kHz 392 1000 0.71875 ±0.015 12 1 8 7.813kHz to 125kHz 280 1000 0.78125 ±0.015 13 1 4 15.63kHz to 250kHz 182 976 0.84375 ±0.015 14 1 2 31.25kHz to 500kHz 102 976 0.90625 ±0.015 15 1 1 62.5kHz to 1MHz Short Open ≥ 0.96875 ±0.015 OPERATION Table 1 offers recommended 1% resistor values that ac- curately produce the correct voltage division as well as the corresponding NDIV and Hi-Z values for the recommended resistor pairs. Other values may be used as long as: 1. The VDIV/V+ ratio is accurate to ±1.5% (including resis- tor tolerances and temperature effects) 2. The driving impedance (R1||R2) does not exceed 500kΩ. If the voltage is generated by other means (i.e. the output of a DAC) it must track the V+ supply voltage. The last column in Table 1 shows the ideal ratio of VDIV to the supply voltage, which can also be calculated as: VDIV V+ = DIVCODE + 0.5 16 ± 1.5% For example, if the supply is 3.3V and the desired DIVCODE is 4, VDIV = 0.281 • 3.3V = 928mV ± 50mV. Figure 2 illustrates the information in Table 1, showing that NDIV is symmetric around the DIVCODE midpoint. 0.5• V+ 6990 F02 1000 100 10 1 0.1 INCREASING VDIV V+ 0V RECOMMENDED RANGE EXTENDED RANGE Hi-Z BIT = 0 Hi-Z BIT = 1 0 15 1 3 2 5 4 7 6 9 8 11 10 13 12 14 Figure 2. Frequency Range and Hi-Z Bit vs DIVCODE |
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