Texas Instruments DEM-DAI3793A User Manual
www.ti.com
5.4.1 Digital-to-Analog (D/A) Performance
Measurements for Dynamic Characteristics
Measurement path: 01.Line Output and Headphone Output
csv file: 01_DAC_Line_Output_and_Headphone_Output.csv
csv file: 01_DAC_Line_Output_and_Headphone_Output.csv
Table 5-1. D/A Line Output Parameters
Power Supply
Parameter
Filter Setting
R
L
(k
Ω
)
LOL
LOR
3.3V
THD+N (0dBFS at 1kHz)
400Hz—20kHz AES-17
10
0.007%
0.008%
SNR (BPZ input)
22Hz—20kHz SPCL +
10
93.1dB
93.0dB
A-weighting
DR (–60dBFS input)
22Hz—20kHz SPCL +
10
93.1dB
92.9dB
A-weighting
Channel Separation
22Hz—20kHz AES-17
10
90.5dB
90.4dB
(BPZ input for target
channel)
Table 5-2. 16
Ω
Headphone Output Inserted in Headphone Jack J6
Power Supply
Parameter
Filter Setting
R
L
(
Ω
)
HPOL
HPOR
3.3V
THD+N (40mW, HP
400Hz—20kHz AES-17
16
0.028%
0.027%
volume = –1dB)
SNR (BPZ input)
22Hz—20kHz SPCL +
16
93.1dB
93.0dB
A-weighting
DR (–60dBFS input)
22Hz—20kHz SPCL +
16
93.4dB
93.1dB
A-weighting
To obtain the performance results shown in
and
, the speaker module should be
powered down, and other functions should be set with these parameters:
•
Speaker Amp: Disabled
•
ADC L-channel and ADC R-channel: Disabled
•
ALC: Off
•
Volume: 0dB
•
Analog mixing: Disabled
•
R
L
= 10k
Ω
for the line output
•
R
L
= 16
Ω
inserted in the J6 headphone jack for the headphone output
The bundled .csv file automatically sets the device to these conditions.
Note:
The headphone volume should be changed from 0dB to –1dB and the signal input level of
the Audio Precision analyzer should be changed to 40mW output power when THD+N is
measured at 16
the Audio Precision analyzer should be changed to 40mW output power when THD+N is
measured at 16
Ω
.
See
:
for a signal flow block diagram.
Evaluation and Measurements
56
SBAU127 – July 2007