AK4646EN AKM [Asahi Kasei Microsystems], AK4646EN Datasheet - Page 34
AK4646EN
Manufacturer Part Number
AK4646EN
Description
Stereo CODEC with MIC/SPK-AMP
Manufacturer
AKM [Asahi Kasei Microsystems]
Datasheet
1.AK4646EN.pdf
(79 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AK4646EN-L
Manufacturer:
AKM
Quantity:
20 000
- Current page: 34 of 79
- Download datasheet (823Kb)
■
(1) High Pass Filter (HPF)
Normally, this HPF is used for a Wind-Noise Reduction Filter. This is composed with 2 steps of 1st order HPF. The
coefficient of both HPF is the same and set by F1A13-0 bits and F1B13-0 bits. HPFAD bit controls ON/OFF of the 1st
step HPF and HPF bit controls ON/OFF of the 2nd step HPF. When the HPF is OFF, the audio data passes this block by
0dB gain. The coefficient should be set when HPFAD=HPF bits = “0” or PMADL=PMADR= PMDAC bits = “0”.
Register setting (Note 34)
(2) Low Pass Filter (LPF)
This is composed with 1st order LPF. F2A13-0 bits and F2B13-0 bits set the coefficient of LPF. LPF bit controls ON/OFF
of the LPF. When the LPF is OFF, the audio data passes this block by 0dB gain. The coefficient should be set when LPF
bit = “0” or PMADL=PMADR=PMDAL=PMDAR bits = “0”.
Register setting (Note 34)
MS0557-E-02
Digital Programmable Filter Circuit
fs: Sampling frequency
fc: Cut-off frequency
fs: Sampling frequency
fc: Cut-off frequency
The cut-off frequency should be set as below.
The cut-off frequency should be set as below.
HPF: F1A[13:0] bits =A, F1B[13:0] bits =B
(MSB=F1A13, F1B13; LSB=F1A0, F1B0)
A =
Transfer function
LPF: F2A[13:0] bits =A, F2B[13:0] bits =B
(MSB=F2A13, F1B13; LSB=F2A0, F2B0)
A =
Transfer function
fc/fs ≥ 0.0001 (fc min = 4.41Hz at 44.1kHz)
fc/fs ≥ 0.05 (fc min = 2205Hz at 44.1kHz)
H(z) = A
H(z) = A
1 + 1 / tan (πfc/fs)
1 + 1 / tan (πfc/fs)
1 / tan (πfc/fs)
1 + Bz
1 + Bz
1 − z
1 + z
1
−1
−1
−1
−1
,
,
B =
B =
1 − 1 / tan (πfc/fs)
1 + 1 / tan (πfc/fs)
1 − 1 / tan (πfc/fs)
1 + 1 / tan (πfc/fs)
- 34 -
[AK4646]
2007/05
Related parts for AK4646EN
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
AK4565VFLOW POWER 20BIT CODEC WITH BUILT IN ALC
Manufacturer:
AKM Asahi Kasei Microsystems
Datasheet:
Part Number:
Description:
AK4628VQHIGH PERFORMANCE MULTI CHANNEL AUDIO CODEC
Manufacturer:
AKM Asahi Kasei Microsystems
Datasheet:
Part Number:
Description:
AK8812NTSC/PAL Digital Video Encoder
Manufacturer:
AKM Asahi Kasei Microsystems
Datasheet:
Part Number:
Description:
LOW POWER 16BIT ADC
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
24Bit 96kHz ?? ADC
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
96kHz 24Bit ADC with Single - ended Input
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
Super High Performance 192kHz 24-Bit ADC
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
125m / 156m Laser Diode Driver Apc - Asahi Kasei Microsystems
Manufacturer:
AKM Semiconductor, Inc.
Datasheet:
Part Number:
Description:
7 Channel E1 Transceiver - Asahi Kasei Microsystems
Manufacturer:
AKM Semiconductor, Inc.
Datasheet:
Part Number:
Description:
Step-up/step-down 60ma Regulated Charge Pump - Asahi Kasei Microsystems
Manufacturer:
AKM Semiconductor, Inc.
Datasheet:
Part Number:
Description:
16-Bit ?? Mono ADC with PLL & MIC-AMP
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
PLL & MIC-AMP 16-Bit Stereo ADC
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
4-Channel ADC with PLL & MIC-AMP
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
192kHz 24-Bit Stereo ?? DAC with 2Vrms Output
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet:
Part Number:
Description:
Low Power 20bit ?? ADC with PGA
Manufacturer:
AKM [Asahi Kasei Microsystems]
Datasheet: