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參數(shù)資料
| 型號(hào)： | UPD63210L |
| 廠商： | NEC Corp. |
| 英文描述： | 16-BIT D/A CONVERTER WITH BUILT-IN DIGITAL FILTER FOR AUDIO |
| 中文描述： | 16位D /一個(gè)內(nèi)置轉(zhuǎn)換器，在數(shù)字的音頻過(guò)濾器 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 141K |
| 代理商： | UPD63210L |
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μ
PD63210, 63210L
13
3.8 Configuration of Analog LPF
Because the stop band rejection of the built-in 8-times oversampling digital filter is large (90 dB), the
configuration of the analog LPF can be simple. Furthermore, by incorporating the output buffer (BUFF) of the
D/A converter and the operational amplifier for LPF configuration, an analog LPF can be configured based on
an extremely small number of external components. LPF’s cutoff frequency can be set with an external constant
in accordance with the sampling frequency.
Figure 3-9 shows the configuration of the D/A converter output section. As such, an LPF is configured by
inserting an RC circuit between the BUFF output and AMP input. This diagram shows an example of configuring
a Butterworth filter whose gain is 0 dB.
In this case, R1 becomes the load of the BUFF output pin; therefore, ensure that the selection satisfies the
electrical specifications (RL of the recommended operation range).
LPF Configuration Example
Conditions
Cutoff frequency : fc = 30 kHz
Configuration
Gain
IC used
Parts constants
R1 = 7.5 k
C1 = 680 pF
: Primary Butterworth
: 0 dB
:
μ
PD63210
¨
Figure 3-9. Configuration of D/A Converter Output Section (Configuration of Analog LPF)
Lch
DAC
BUFF(L)
BUFF(R)
AMP(L)
+
-
AMP(R)
+
-
DF
LPF
LPF
R1
C1
LO
RO
ANIL
APIL
APIR
ANIR
Lch
analog out
Rch
analog out
Rch
DAC
AOL
AOP
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