參數(shù)資料
型號(hào): AK4343EN
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: Stereo DAC with HP/RCV/SPK-AMP
中文描述: 立體聲DAC惠普/垃圾車(chē)/胰腎聯(lián)合移植腺苷
文件頁(yè)數(shù): 38/98頁(yè)
文件大?。?/td> 851K
代理商: AK4343EN
ASAHI KASEI
[AK4343]
MS0478-E-01
2006/10
- 38 -
[Filter Coefficient Setting]
1) When FIL1 and FIL2 are set to “HPF”
fs: Sampling frequency
fc: Cut-off frequency
f: Input signal frequency
K: Filter gain [dB] (Filter gain of should be set to 0dB.)
Register setting
FIL1: F1AS bit = “0”, F1A[13:0] bits =A, F1B[13:0] bits =B
FIL3: F3AS bit = “0”, F3A[13:0] bits =A, F3B[13:0] bits =B
(MSB=F1A13, F1B13, F3A13, F3B13; LSB=F1A0, F1B0, F3A0, F3B0)
1 / tan (
π
fc/fs)
A = 10
K/20
x
1 + 1 / tan (
π
fc/fs)
B =
1
1 / tan (
π
fc/fs)
1 + 1 / tan (
π
fc/fs)
,
Transfer function
Amplitude
Phase
H(z) = A
1
z
1
1 + Bz
1
M(f) = A
2
2cos (2
π
f/fs)
1 + B
2
+ 2Bcos (2
π
f/fs)
θ
(f) = tan
1
(B+1)sin (2
π
f/fs)
1 - B + (B
1)cos (2
π
f/fs)
2) When FIL1 and FIL2 are set to “LPF”
fs: Sampling frequency
fc: Cut-off frequency
f: Input signal frequency
K: Filter gain [dB] (Filter gain of FIL1 should be set to 0dB.)
Register setting
FIL1: F1AS bit = “1”, F1A[13:0] bits =A, F1B[13:0] bits =B
FIL3: F3AS bit = “1”, F3A[13:0] bits =A, F3B[13:0] bits =B
(MSB=F1A13, F1B13, F3A13, F3B13; LSB=F1A0, F1B0, F3A0, F3B0)
1
A = 10
K/20
x
1 + 1 / tan (
π
fc/fs)
B =
1
1 / tan (
π
fc/fs)
1 + 1 / tan (
π
fc/fs)
,
Transfer function
Amplitude
Phase
H(z) = A
1 + z
1
1 + Bz
1
M(f) = A
2 + 2cos (2
π
f/fs)
1 + B
2
+ 2Bcos (2
π
f/fs)
θ
(f) = tan
1
(B
1)sin (2
π
f/fs)
1 + B + (B+1)cos (2
π
f/fs)
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