ISL5216_05 INTERSIL [Intersil Corporation], ISL5216_05 Datasheet - Page 55

• Manufacturer Part Number: ISL5216_05
• Description: Four-Channel Programmable Digital DownConverter
• Manufacturer: INTERSIL [Intersil Corporation]

ROMd FIR Filters - Response Curves
NOTE: HBF4 not included in the ROMd Fir Filter Coefficient memory. See Note 26 of Table 52.
FIGURE 13. CIC PASSBAND ROLLOFF (N = # OF STAGES,
FIGURE 15. 5TH ORDER (N = 5) CIC RESPONSE
-100
-120
-140
-20
-40
-60
-80
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
0.0
0
0.0
0.0
R = DECIMATION FACTOR, f
OUTPUT RATE)
(R = DECIMATION FACTOR, f
OUTPUT RATE)
0.5
0.1
1.0
N = 5
0.2
N = 4
55
FIGURE 17. ROMd HALFBAND FILTER ALIAS FREQUENCY RESPONSE
f
f
1.5
S
S
/R
/R
-100
-120
-110
0.3
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
S
2.0
0
S
/R = 1 is CIC
HBF1
/R = 1 is CIC
N = 2
0.4
HBF2
2.5
N = 1
N = 3
0.0625
HBF3
0.5
3.0
ISL5216
0.125
f
S
NOTE: HBF4 not included in the ROMd Fir Filter Coefficient memory.
See Note 26 of Table 52.
FIGURE 14. CIC FIRST ALIAS LEVEL (N = # OF STAGES,
FIGURE 16. ROMd HALFBAND FILTER FREQUENCY
HBF4
-100
-120
-140
-20
-40
-60
-80
HBF5
0
0.00
0.1875
N = 1
R = DECIMATION FACTOR, f
OUTPUT RATE)
RESPONSE
0.10
N = 5
0.25
N = 4
N = 3
N = 2
0.20
f
S
/R
0.30
S
/R = 1 is CIC
0.40
July 8, 2005
0.50