www.ti.com
Shortplug
Shortplug
Shortplug
Shortplug
Allopen
CN305
CN307
T-SCLK
GND
T-BCK
T-SCK
T-LRCK
T-BCK
TX-DATA
T-LRCK
E-SCLK
TX-DATA
R-SCLK
R-SCLK
R-BCK
R-BCK
R-LRCK
R-LRCK
RX-DATA
RX-DATA
E-SCK
SCK
T-SCLK
BCK
T-BCK
fromU003(DIR:LC89052T)onDaughterCard#2
fromU003(DIR:LC89052T)onDaughterCard#2
CN308
CN320
PSIA-2722
5.4 Measurements for Dynamic Characteristics
Measurements for Dynamic Characteristics
Figure 5-6. Jumper Configuration for Combined Master and Slave Modes
Typical dynamic performance graphs for digital-to-analog converters (DACs) generally represent fourperformance characteristics (in addition to other specifications): total harmonic distortion and noise(THD+N); signal-to-noise ratio (SNR); dynamic range (DR); and channel separation. These graphs alsospecify the test environment and measurement conditions required in order to meet typical performancevalues defined in the product data sheet.
For the DEM-DAI3793A/3794A EVM, the evaluation environment specifications are:
•Equipment used: Audio Precision, System Two Cascade Plus
•Audio Data format: 16-bit Left-Justified
•SCKI / BCK / LRCK (f
S
): 256f
S
/ 64f
S
/ 48 kHz
•Power supply: V
DD
= V
IO
= V
CC
= V
PA
= 3.3V (Regulated down from 10V applied to the motherboard)
•Temperature: Room/ambient
Once the lab or test environment is configured according to these parameters, start the EVM software (asdiscussed in Section 3.2 ). Click All Power On in the startup window or execute power_on.csv, and thenexecute the .csv file that corresponds to the appropriate measurement path discussed in the subsequentsections of this chapter.
SBAU127 – July 2007 Evaluation and Measurements 55Submit Documentation Feedback