Data Translation DT9857, Руководство пользователя, Страница: 148 / 192

Appendix A
148
Analog Output Specifications
Table 25 lists the specifications for the analog output subsystem on the DT9857 and DT9857E
modules. Unless otherwise noted, specifications are typical at 25

C.
Note: The DT9857E-8-xAO, DT9857E-16-xAO and their OEM versions do not support the
analog output (D/A) subsystem.
Table 25: Analog Output Subsystem Specifications
Feature DT9857 and DT9857E Specifications
Number of analog output channels 2, single-ended
a
Resolution 32 bits
D/A type Delta Sigma
Output range ±10 V
Data encoding Offset binary
Minimum sample frequency 30 kHz
Maximum sample frequency 216 kHz
D/A master clock range
Sampling Frequency
30 kHz to 54 kHz:
54 kHz to 108 kHz:
108 kHz to 216 kHz:
13.824 MHz to 27.648 MHz
512 x sample frequency
256 x sample frequency
128 x sample frequency
Group delay (typical) 36/sample rate, in seconds
DAC Delta Sigma filter
b
Passband, –3 dB:
Passband ripple, ±0.005 dB:
Stopband
Stopband attenuation, –100 dB:
Stopband attenuation, –95 dB:
Stopband attenuation, –90 dB: 0.49 x sample frequency, Hz
0.454 x sample frequency, Hz
0.546 x sample frequency, Hz
Sample frequency

44.1 kHz
Sample frequency

96 kHz
Sample frequency

192 kHz
Analog filter
b
120 kHz, 2-pole, low-pass Butterworth
Output current ±3 mA maximum load
(10 V across 3.3 k

Output FIFO 64 kSamples
Idle channel noise
(216 kSPS)
30

VRMS
Total Harmonic Distortion, THD
c
(216 kSPS
–1 dBFS, 1 kHz output, 3.3 k

load:
–6 dBFS, 1 kHz output, 3.3 k

load:
–100 dB
–110 dB