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參數(shù)資料
| 型號： | PCM1710 |
| 英文描述： | Stereo Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 立體聲音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 16/17頁 |
| 文件大?。?/td> | 192K |
| 代理商： | PCM1710 |
PCM1710U
16
TEST CONDITIONS
Figure 18 illustrates the actual test conditions applied to
PCM1710 in production. The 11th-order filter is necessary
in the production environment for the removal of noise,
resulting from the relatively long physical distance between
the unit and the test analyzer. In most actual applications, the
third-order filter shown in Figure 17 is adequate. Under
normal conditions, THD+N typical performance is –70dB
with a 30kHz low pass filter (shown here on the THD
meter), improving to –92dB when the external 20kHz sec-
ond-order filter is used.
EVALUATION FIXTURES
Two different evaluation fixtures are available for PCM1710.
DEM-PCM1710
This evaluation fixture is primarily intended for quick evalu-
ation of the PCM1710’s performance. DEM-PCM1710 can
accept either an external clock or a user-installed crystal
oscillator. All of the functions can be controlled by on-board
switches. DEM-PCM1710 does not contain a receiver chip
or an external low pass filter. DEM-PCM1710 requires a
single +5V power supply.
DEM-DAI1710
This fixture is more complete than DEM-PCM1710; it
includes a Digital Audio Interface (DAI) receiver chip for
easy use and to provide a low-jitter 256fs system clock to the
PCM1710. Also included are dual second-order low pass
filters using Burr-Brown’s OPA2604 dual FET-input op
amp. The output of the DEM-DAI1710 is 2Vrms, using
standard BNC-type connectors.
All of the functions of PCM1710 can be evaluated by using
the DEM-DAI1710 jumper selections. DEM-DAI1710 re-
quires +5V and
±
5V to
±
15V power supplies. The schematic
diagram for DEM-DAI1710 is shown in Figure 19. For more
detailed information on the evaluation fixtures, contact your
local Burr-Brown representative.
FIGURE 17. 3rd-Order LPF.
10k
10k
680pF
10k
1500pF
100pF
+
V
SIN
–
5
4
3
2
1
90
0
–90
–180
–270
–360
100
1k
10k
100k
1M
GAIN vs FREQUENCY
Frequency (Hz)
P
6
–14
–34
–54
–74
–94
G
Gain
Phase
FIGURE 18. Test Block Diagram.
PGA
Digital
Lch
Rch
DEM-
DAI1710
CD
Player
11th-order
20kHz
LPF
THD
Meter
0dB/60dB
30KHz LPF on
Through
For test of S/N ratio and Dynamic Range, A-filter ON.
Test Disk
Shibasoku #725
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