AK4645AEZ Datasheet, PDF (34/85 Pages) Asahi Kasei Microsystems – Stereo CODEC with MIC/HP-AMP

[AK4645A]
[ϑΟϧλ܎਺ͷઃఆʹ͍ͭͯ]
1) FIL1, FIL3ΛHPFʹઃఆ͢Δ৔߹
fs: αϯϓϦϯάप೾਺
fc: ΧοτΦϑप೾਺
f: ೖྗ৴߸प೾਺
K: ήΠϯ[dB] (FIL1ͷήΠϯ͸0dBʹઃఆͯ͠Լ͍͞ɻ)
Ϩδελઃఆ
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 (πfc/fs)
A = 10^K/20 x
,
1 + 1 / tan (πfc/fs)
1 − 1 / tan (πfc/fs)
B=
1 + 1 / tan (πfc/fs)
఻ୡؔ਺
ৼ෯
Ґ૬
1 − z ^−1
H(z) = A
1 + Bz ^−1
M(f) = A
2 − 2cos (2πf/fs)
1 + B² + 2Bcos (2πf/fs)
(B+1)sin (2πf/fs)
θ(f) = tan ^−1
1 - B + (B−1)cos (2πf/fs)
2) FIL1, FIL3ΛLPFʹઃఆ͢Δ৔߹
fs: αϯϓϦϯάप೾਺
fc: ΧοτΦϑप೾਺
f: ೖྗ৴߸प೾਺
K: ήΠϯ[dB] (FIL1ͷήΠϯ͸0dBʹઃఆͯ͠Լ͍͞ɻ)
Ϩδελઃఆ
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 (πfc/fs)
1 − 1 / tan (πfc/fs)
B=
1 + 1 / tan (πfc/fs)
఻ୡؔ਺
ৼ෯
Ґ૬
1 + z ^−1
H(z) = A
1 + Bz ^−1
M(f) = A
2 + 2cos (2πf/fs)
1 + B² + 2Bcos (2πf/fs)
(B−1)sin (2πf/fs)
θ(f) = tan ^−1
1 + B + (B+1)cos (2πf/fs)
MS0986-J-00
- 34 -
2008/07