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參數(shù)資料
| 型號： | PCM1728 |
| 英文描述： | 24-Bit, 96kHz Sampling CMOS Delta-Sigma Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 24位，96kHz采樣的CMOSΔ-Σ立體聲音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 185K |
| 代理商： | PCM1728 |
10
PCM1728
APPLICATION
CONSIDERATIONS
DELAY TIME
There is a finite delay time in delta-sigma converters. In A/D
converters, this is commonly referred to as latency. For a
delta-sigma D/A converter, delay time is determined by the
order number of the FIR filter stage, and the chosen sampling
rate. The following equation expresses the delay time of
PCM1728:
T
D
= 30
x
1/f
S
For f
S
= 44.1kHz, T
D
= 30/44.1kHz = 680
μ
s
Applications using data from a disc or tape source, such as
CD audio, DVD audio, Video CD, DAT, Minidisc, etc.,
generally are not affected by delay time. For some profes-
sional applications such as broadcast audio for studios, it is
important for total delay time to be less than 2ms.
OUTPUT FILTERING
For testing purposes all dynamic tests are done on the
PCM1728 using a 20kHz low pass filter. This filter limits
the measured bandwidth for THD+N, etc. to 20kHz. Failure
to use such a filter will result in higher THD+N and lower
SNR and Dynamic Range readings than are found in the
specifications. The low pass filter removes out of band
noise. Although it is not audible, it may affect dynamic
specification numbers.
The performance of the internal low pass filter from DC to
40kHz is shown in Figure 10. The higher frequency roll-off
of the filter is shown in Figure 11. If the user’s application
has the PCM1728 driving a wideband amplifier, it is recom-
mended to use an external low pass filter.
BYPASSING POWER SUPPLIES
The power supplies should be bypassed as close as possible
to the unit. Refer to Figure 12 for optimal values of bypass
capacitors.
1
10
100
1k
10k
100k
1
0.5
0
–0.5
–1
L
Log Frequency (Hz)
FIGURE 10. Low Pass Filter Response.
FIGURE 11. Low Pass Filter Response.
POWER SUPPLY
CONNECTIONS
PCM1728 has four power supply pin for digital (V
DD
), and
analog (V
CC
). Each connection also has a separate ground. If
the power supplies turn on at different times, there is a
possibility of a latch-up condition. To avoid this condition,
it is recommended to have a common connection between
the digital and analog power supplies. If separate supplies
are used without a common connection, the delta between
the two supplies during ramp-up time must be less than
0.1V.
1
10
100
1k
10k
100k
10M
1M
20
0
–20
–40
–60
–80
–100
L
Log Frequency (Hz)
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