cxa1720q Sony Electronics, cxa1720q Datasheet - Page 18

• Manufacturer Part Number: cxa1720q
• Description: Read/write Amplifier With Built-in Filters For Fdds
• Manufacturer: Sony Electronics

Filter Customization Selections/Combinations
select fc ratios and LPF types for the other three modes. The 1M/outer track to 2M/outer track modes for the
LPF are fixed to Butterworth, while either Butterworth or Chebyshev 1 dB ripple can be selected in 2M/inner
track mode.
relationship between the peak frequencies fo and fc in regards to the comprehensive characteristics is as
follows, depending on differences in LPFs.
Note) The boxed item indicates the setting for the CXA1720Q.
In filter settings, use the LPF cut-off frequency f
Note that the BPF center frequency f
Butterworth characteristics:
Chebyshev 1 dB ripple characteristics:
1M/outer track
2M/outer track
1M/inner track
2M/inner track
Mode
Butterworth
Butterworth
Butterworth
Butterworth
Chebyshev
(1 dB ripple)
LPF type
Table 1 LPF fc Ratios and Types
oB
is fixed at 1.2 times the LPF cut-off frequency fc. In addition, the
f
f
C
C
= 1.28fo
= 1.12fo
C1
1.00
1.07
1.60
1.33
1.68
2.29
1.33
1.68
2.29
—18—
in 1M/outer track mode as 1.00 as shown in Table 1 to
f
1.14
2.00
1.39
1.78
2.46
1.39
1.78
2.46
c
ratio when f
1.23
1.45
1.88
2.67
1.45
1.88
2.67
c1
is assumed as 1.00
1.33
1.52
2.00
1.52
2.00
CXA1720Q
1.45
1.60
2.13
1.60
2.13