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參數(shù)資料
| 型號： | AKD4528 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | EVALUATION BOARD FOR AK4528 REV.C |
| 中文描述： | 評估板AK4528 REV.C |
| 文件頁數(shù)： | 2/38頁 |
| 文件大?。?/td> | 302K |
| 代理商： | AKD4528 |
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ASAHI KASEI
[AKD4528]
<KM063100>
’00/06
- 2 -
1. Analog Input Buffer Circuit
The ADC inputs are full differential and the input resistance is 27k
(typ. @fs=44.1kHz). The input signal range scales
with the VREF voltage and nominally 0.56 x VREF Vpp. It is recommended that the input DC bias voltage is 2.9V(The
bias is a voltage divided by resistors (3.3k and 4.7k) from VA in figure 2. The ADC output data format is 2’s complement.
The output code is 7FFFFFH(@24bit) for input above a positive full scale and 800000H(@24bit) for input below a
negative fill scale. The ideal code is 000000H(@24bit) with no input signal. The DC offset including ADC own DC offset
removed by the internal HPF (fc=0.9Hz@fs=44.1kHz).
The AK4528 samples the analog inputs at 64fs. The digital filter rejects noise above the stopband except for multiples of
64fs. A simple RC filter may be used to attenuate any noise around 64fs though most audio signals do not have significant
energy at 64fs. Figure 2 is an example of differential input circuit.
AK4528
AINR+
1.5nF
330
+
Vop+/-=+/-15V
Signal
10k
330
0.1u
22u
4.7k
4.7k
5.96Vpp
2.8Vpp
2
3
4
5
AINR-
AINL-
AINL+
4.7k
Vop+
4.7k
VA
3.3k
10u
BIAS
Same circuit
2.8Vpp
NJM5532
+
+
-
-
Vop-
VA=5V
Input RC filter response : fc = 160kHz, g = -0.07dB at 20kHz, -0.26dB at 40kHz.
Figure 2. Differential Input Buffer Example
2.Analog Output Buffer Circuit
The 2nd-order LPF (fc=93.2kHz, Q=0.712) which adds differential output of AK4528 is implemented on the board.
When the further attenuation of the out-band noise is needed, some additional LPF is required. NJM5532D is used for
op-amp. Analog signal is output through BNC connectors (AOUTL, AOUTR) on board, and the output level of AK4528is
about 5.4Vp-p.
AOUT-
AOUT+
+Vop
-Vop
Analog
Out
4.7k
4.7k
200
4.7k
3300p
200
4.7k
470p
470p
fc=93.2kHz, Q=0.712, g=-0.1dB at 40kHz
+
-
Figure 3. External 2nd order LPF Example (using dual supply op-amp)
相關PDF資料 |
PDF描述 |
|---|---|
| AKD4550 | EVALUATION BOARD REV.C FOR AK4550 |
| AKD4550(AKD4550) | Evaluation board Rev.C for AK4550 |
| AKD4550.(AKD4550) | Evaluation board Rev.C for AK4550 |
| AKD4551 | EVALUATION BOARD REV.C FOR AK4551 |
| AKD4551(AKD4551) | Evaluation board Rev.C for AKD4551 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AKD4528_05 | 制造商:AKM 制造商全稱:AKM 功能描述:24Bit A/D & D/A converter |
| AKD4529 | 制造商:AKM 制造商全稱:AKM 功能描述:High Performance Multi-channel Audio CODEC |
| AKD4532 | 制造商:AKM 制造商全稱:AKM 功能描述:Internet/Network/General Purpose Multimedia Audio CODEC |
| AKD4534 | 制造商:AKM 制造商全稱:AKM 功能描述:16Bit CODEC with MIC/HP/SPK-AMP |
| AKD4536 | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit Mono CODEC with ALC & MIC/SPK-AMP |
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