參數(shù)資料
型號(hào): PCM1739
英文描述: 24-Bit, 192kHz Sampling, Enhanced Multi-Level, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER
中文描述: 24位192kHz采樣,增強(qiáng)的多級(jí),Δ-Σ,音頻數(shù)字模擬轉(zhuǎn)換器
文件頁數(shù): 16/16頁
文件大?。?/td> 140K
代理商: PCM1739
16
PCM1739
FIGURE 15. Test Setup for THD+N Measurement.
FIGURE 16. Test Set-Up for Dynamic Range and SNR Measurements.
For the PCM1739, THD+N is measured with a full scale,
1kHz digital sine wave as the test stimulus at the input of
the DAC. The digital generator is set to 24-bit audio word
length and a sampling frequency of 44.1kHz, 96kHz, or
192kHz. The digital generator output is taken from the
unbalanced S/PDIF connector of the measurement system.
The S/PDIF data is transmitted via a coaxial cable to the
digital audio receiver on the DEM-DAI1739 demo board.
The receiver is then configured to output 24-bit data in
either I
2
S or left-justified data format. The DAC audio
interface format is programmed to match the receiver
output format. The analog output is then taken from the
DAC post filter and connected to the analog analyzer input
of the measurment system. The analog input is band lim-
ited using filters resident in the analyzer. The resulting
THD+N is measured by the analyzer and displayed by the
measurement system.
DYNAMIC RANGE
Dynamic range is specified as A-Weighted, THD+N mea-
sured with a –60dBFS, 1kHz digital sine wave stimulus at
the input of the D/A converter. This measurement is de-
signed to give a good indicator of how the DAC will perform
given a low-level input signal.
The measurement setup for the dynamic range measurement
is shown in Figure 15, and is similar to the THD+N test
setup discussed previously. The differences include the
bandlimit filter selection, the additional A-Weighting filter,
and the –60dBFS input level.
IDLE CHANNEL SIGNAL-TO-NOISE RATIO
The SNR test provides a measure of the noise floor of the
D/A converter. The input to the D/A is all 0’s data, and the
D/A converter’s Infinite Zero Detect Mute function must
be disabled (default condition at power up for the PCM1739).
This ensures that the delta-sigma modulator output is con-
nected to the output amplifier circuit so that idle tones (if
present) can be observed and effect the SNR measurement.
The dither function of the digital generator must also be
disabled to ensure an all ‘0’s data stream at the input of the
D/A converter.
The measurement setup for SNR is identical to that used for
dynamic range, with the exception of the input signal level.
(see the notes provided in Figure 16).
S/PDIF
Receiver
Evaluation Board
f
–3dB
= 54kHz or 108kHz
PCM1739
DEM-DAI1739
2nd-Order
Low-Pass
Filter
Notch Filter
Band Limit
HPF = 22Hz
LPF = 30kHz
f
C
= 1kHz
RMS Mode
0dBFS,
1kHz Sine Wave
S/PDIF
Output
Analyzer
and
Display
20kHz
Apogee
Filter
Digital
Generator
S/PDIF
Receiver
Evaluation Board
PCM1739
(1)
DEM-DAI1739
2nd-Order
Low-Pass
Filter
Notch Filter
Band Limit
HPF = 22Hz
LPF = 22kHz
f
C
= 1kHz
f
–3dB
= 54kHz or 108kHz
0% Full Scale,
Dither Off (SNR) or
–60dBFS,
1kHz Sine Wave
(Dynamic Range)
S/PDIF
Output
A-Weight
Filter
(2)
RMS Mode
Analyzer
and
Display
Digital
Generator
NOTES: (1) Infinite Zero Detect Mute disabled.
(2) Results without A-Weighting will be
approximately 3dB worse.
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