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參數(shù)資料
| 型號： | PCM4108CPAPT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 高性能，24位，216kHz的最大采樣，八聲道音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 16/39頁 |
| 文件大小： | 551K |
| 代理商： | PCM4108CPAPT |
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SBAS354 JUNE 2005
www.ti.com
16
ground. A 0.01
μ
F bypass capacitor should be placed
between the corresponding high and low reference pins.
An X7R ceramic chip capacitor is recommended for this
purpose. In some cases, a larger capacitor may need to be
placed in parallel with the 0.01
μ
F capacitor, with the value
of the larger capacitor being dependent upon the
low-frequency power-supply noise present in the system.
Typical values may range from 1
μ
F to 10
μ
F. Low ESR
tantalum or multilayer ceramic chip capacitors are
recommended. Figure 3 illustrates the recommended
connections for the reference pins.
(1) Capacitor(s) required for each of the four reference pairs.
V
REF
+
(1)
V
COM
1
0.01
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F to 10
μ
F
V
CC
V
COM
2
V
REF
(1)
Figure 3. Recommended Connections for Voltage
Reference and Common-Mode Output Pins
In addition to the reference pins, there are two
common-mode voltage output pins, V
COM
1 (pin 64) and
V
COM
2 (pin 49). These pins are nominally set to a value
equal to V
CC
/2 by internal voltage dividers. The V
COM
1 pin
is common to both Channels 1, 2, 5, and 6, while the
V
COM
2 pin is common to Channels 3, 4, 7, and 8. A 0.1
μ
F
X7R ceramic chip capacitor should be connected between
the common-mode output pin and analog ground. The
common-mode outputs are used primarily to bias external
output circuitry.
SAMPLING MODES
The PCM4108 can operate in one of three sampling
modes: Single Rate, Dual Rate, or Quad Rate. Sampling
modes are selected by using the FS[1:0] bits in Control
Register 6
in Software mode, or by using the FS0 (pin 36)
and FS1 (pin 37) inputs in Standalone mode.
The Single Rate mode allows sampling frequencies up to
and including 54kHz. The D/A converter performs 128x
oversampling of the input data in Single Rate mode.
The Dual Rate mode allows sampling frequencies greater
than 54kHz, up to and including 108kHz. The D/A
converter performs 64x oversampling of the input data in
Dual Rate mode.
The Quad Rate mode allows sampling frequencies greater
than 108kHz, up to and including 216kHz. The D/A
converter performs 32x oversampling of the input data in
Quad Rate mode.
Refer to Table 1 for examples of system clock
requirements for common sampling frequencies.
SYSTEM CLOCK REQUIREMENTS
The PCM4108 requires a system clock, applied at the
SCKI input (pin 19). The system clock operates at an
integer multiple of the input sampling frequency, or f
S
. The
multiples supported include 128f
S
, 192f
S
, 256f
S
, 384f
S
,
512f
S
, or 768f
S
. The system clock frequency is dependent
upon the sampling mode. Table 1 shows the required
system clock frequencies for common audio sampling
frequencies. Figure 4 shows the system clock timing
requirements.
Although the architecture of the PCM4108 is tolerant to
phase jitter on the system clock, it is recommended that
the user provide a low jitter clock (100ps or less) for optimal
performance.
Table 1. Sampling Modes and System Clock Frequencies for Common Audio Sampling Rates
SAMPLING FREQUENCY, fS
(kHz)
SYSTEM CLOCK FREQUENCY (MHz)
SAMPLING MODE
Single Rate
128fS
n/a
192fS
n/a
256fS
8.192
384fS
12.288
512fS
16.384
768fS
24.576
32
Single Rate
44.1
n/a
n/a
11.2896
16.9344
22.5792
33.8688
Single Rate
48
n/a
n/a
12.288
18.432
24.576
36.864
Dual Rate
88.2
n/a
n/a
22.5792
33.8688
n/a
n/a
Dual Rate
96
n/a
n/a
24.576
36.864
n/a
n/a
Quad Rate
176.4
22.5792
33.8688
n/a
n/a
n/a
n/a
Quad Rate
192
24.576
36.864
n/a
n/a
n/a
n/a
P
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCM4108PAPR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER |
| PCM4108PAPT | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER |
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| PCM-410A-00A1E | 制造商:ADVANTECH 制造商全稱:Advantech Co., Ltd. 功能描述:Riser Card & I/O Modules |
| PCM-410B | 制造商:ADVANTECH 制造商全稱:Advantech Co., Ltd. 功能描述:Riser Card & I/O Modules |
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