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參數(shù)資料
| 型號： | CDB4215 |
| 廠商： | Cirrus Logic, Inc. |
| 元件分類： | Codec |
| 英文描述： | 16-Bit Multimedia Audio Codec |
| 中文描述： | 16位多媒體音頻編解碼器 |
| 文件頁數(shù)： | 9/52頁 |
| 文件大小： | 878K |
| 代理商： | CDB4215 |
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1 V
rms
. The CMOUT reference level is used to
level shift the signal. This level shifting allows
the line inputs to be DC coupled into the
CS4215. Minimum ADC offset results when the
line inputs are DC coupled (see Analog Charac-
teristics Table).
Figure 3 shows an AC coupled input circuit for
signals centered around 0 Volts. The anti-alias-
ing RC filter presents a low impedance at high
frequencies and should be driven by a low im-
pedance source.
Microphone Level Inputs
Internal amplifiers with a programmable 20 dB
gain block are provided for the microphone level
inputs, MINR and MINL. Figure 4 shows a sin-
gle-ended input microphone pre-amplifier stage
with a gain of 23 dB. AC coupling is mandatory
for these inputs since any DC offset on the input
will be amplified by the codec.
The 20 dB gain block may be disabled using the
MLB bit in Control Time Slot 1. When
dis-
abled, the inputs become line level with full
scale inputs of 1 Vrms.
Adjustable Input Gain
The signals from the microphone or the line in-
puts are routed to a programmable gain circuit
which provides up to 22.5 dB of gain in 1.5 dB
steps. Level changes only take effect on zero
crossings to minimize audible artifacts, often re-
ferred to as "zipper noise". The requested level
change is forced if no zero crossing is found af-
ter 511 frames (10.6 ms at a 48 kHz frame rate).
A separate zero crossing detector exists for each
channel.
Analog Outputs
The analog outputs of the DACs are routed via
an attenuator to a pair of line outputs, a pair of
MINR
1 uF
C6
+
C5
2
3
VA+
8
0.1 uF
C4
560 pF
NPO
10 uF
+
R6
2.2 k
R4
22.1 k
4
1 uF
+
R5
50 k
MINL
(Mono)
1 uF
+
C2
6
5
C1
560 pF
R3
2.2 k
R1
22.1 k
150
10 uF
+
R2
50 k
NPO
C3
CMOUT
C47
C8
1
7
R57
U2
MC33078 or
MC33178
C7
C46
A =20 dB
0.47 uF
C48
0.01 uF
NPO
150
R56
0.01 uF
NPO
Microphone
Input Left
(pin 17)
Microphone
Input Right
(pin 15)
0.47 uF
C45
Figure 4. Optional Microphone Input Buffer
CS4215
DS76F2
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CDB4216 | 16-Bit Stereo Audio Codec |
| CDB4220 | 24-Bit Stereo Audio Codec with 3V Interface |
| CDB4221 | 24-Bit Stereo Audio Codec with 3V Interface |
| CDB4222 | 20-Bit Stereo Audio Codec with Volume Control |
| CDB4224 | 24-Bit 105 dB Audio Codec with Volume Control |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CDB4216 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:16-Bit Stereo Audio Codec |
| CDB4220 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:24-Bit Stereo Audio Codec with 3V Interface |
| CDB4221 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:24-Bit Stereo Audio Codec with 3V Interface |
| CDB4222 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:20-Bit Stereo Audio Codec with Volume Control |
| CDB4223 | 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:24-Bit 105 dB Audio Codec with Volume Control |
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