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HD49338HNP Datasheet(PDF) 9 Page - Renesas Technology Corp |
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HD49338HNP Datasheet(HTML) 9 Page - Renesas Technology Corp |
9 / 23 page HD49338NP/HNP Rev.2.00 May 20, 2005 page 9 of 22 7. Adjustment of Black-Level S/H Response Frequency Characteristics The CR time constant that is used for sampling/hold (S/H) at the black level can be adjusted by changing the register settings, as shown in table 6. Table 6 SHSW CR Time Constant Setting L [0] 2.20 nsec (72 MHz) 2.30 nsec (69 MHz) L [1] L [2] L 2.51 nsec (63 MHz) 2.64 nsec (60 MHz) 2.93 nsec (54 MHz) 3.11 nsec (51 MHz) 3.52 nsec (45 MHz) 3.77 nsec (42 MHz) [3] H [0] L [1] L [2] L [3] L [0] H [1] L [2] L [3] H [0] H [1] L [2] L [3] L [0] L [1] H [2] L [3] H [0] L [1] H [2] L [3] L [0] H [1] H [2] L [3] H [0] H [1] H [2] L [3] L [0] SHSW-fsel (Register setting) 4.40 nsec (36 MHz) 4.80 nsec (33 MHz) L [1] L [2] H CR Time Constant (Typ) (cutoff frequency conversion) 5.87 nsec (27 MHz) 6.60 nsec (24 MHz) 8.80 nsec (18 MHz) 10.6 nsec (15 MHz) 17.6 nsec (9 MHz) 26.4 nsec (6 MHz) [3] H [0] L [1] L [2] H [3] L [0] H [1] L [2] H [3] H [0] H [1] L [2] H [3] L [0] L [1] H [2] H [3] H [0] L [1] H [2] H [3] L [0] H [1] H [2] H [3] H [0] H [1] H [2] H [3] BLKC C4 31 The SHAMP frequency characteristics can be adjusted by changing the register settings and the C4 value of the external 31st pin. The settings are shown in table 7. Values other than those shown in the table 7 cannot be used. 8. SHSW-fsel (Register setting) CR Time Constant (Typ) (cutoff frequency conversion) Table 7 SHAMP Frequency Characteristics Setting 49 MHz 15000 pF (620 pF) 24 MHz 27000 pF (820 pF) 32 MHz 22000 pF (750 pF) SHA-fsel (Register setting) LoPwr (Register setting) Note: Upper line Middle line Lower line : SHAMP cutoff frequency (Typ) : Standard value of C4 (maximum value is not defined) : Minimum value of C4 (do not set below this value) 56 MHz 18000 pF (360 pF) 116 MHz 10000 pF (270 pF) "Lo" "Hi" 75 MHz 13000 pF (300 pF) H [0] L [1] L [0] H [1] H [0] H [1] |
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