PCM1604 BURR-BROWN [Burr-Brown Corporation], PCM1604 Datasheet - Page 32

• Manufacturer Part Number: PCM1604
• Description: 24-Bit, 192kHz Sampling,6-Channel, Enhanced Multi-Level, Delta-Sigma DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

FIGURE 23. Test Set-Up for Dynamic Range and SNR Meeasurements.
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 measurment is designed
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 23, and is similar to the THD+N test
setup discussed previously. The differences include the
band limit filter selection, the additional A-Weighting filter,
and the –60dBFS input level.
NOTES: (1) Infinite Zero Detect Mute disabled.
(2) Results without A-Weighting will be
approximately 3dB worse.
®
PCM1604, PCM1605
S/PDIF
Output
(Dynamic Range)
1kHz Sine Wave
Dither Off (SNR)
0% Full Scale,
–60dBFS,
Generator
Digital
RMS Mode
Analyzer
Display
and
32
Evaluation Board
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 PCM1604,
PCM1605). This ensures that the delta-sigma modulator
output is connected 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 23).
DEM-DAI1604
Receiver
S/PDIF
A-Weight
Filter
(1)
Option = A-Weighting
HPF = 22Hz
LPF = 22kHz
PCM1604
Band Limit
PCM1605
(1)
(2)
f
–3dB
Notch Filter
2nd-Order
Low-Pass
f
C
Filter
= 1kHz
= 54kHz