Data Translation DT9837, User Manual

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Specifications
121
Analog Output Specifications
Table 24 lists the specifications for the analog output subsystem on the DT9837, DT9837A, and
DT9837C modules. Unless otherwise noted, specifications are typical at 25
°
C.
Table 24: Analog Output Subsystem Specifications
Feature DT9837 Specifications DT9837A Specifications DT9837C Specifications
Number of analog output
channels 1 1 1
Resolution 24 bits 24 bits 24 bits
D/A type Delta Sigma Delta Sigma Delta Sigma
Output range ±10 V ±10 V ±3 V
Data encoding Offset binary Offset binary Offset binary
Minimum sample frequency 46.875 kHz 10 kHz 10 kHz
Maximum sample frequency 46.875 kHz 52.734 kHz 96.0 kHz
Group delay (typical) 34/sample rate, in s 29/sample rate, in s 29/sample rate, in s
D/A master clock range output frequency x 256 output frequency x 512 output frequency x 512
DAC Delta Sigma filter
a
Passband, –3 dB:
Passband ripple, ±0.002 dB:
Stopband, –82 dB: 0.49 x sample frequency, Hz
0.454 x sample frequency, Hz
0.546 x sample frequency, Hz 0.49 x sample frequency, Hz
0.454 x sample frequency, Hz
0.5646 x sample frequency, Hz 0.49 x sample frequency, Hz
0.454 x sample frequency, Hz
0.5646 x sample frequency, Hz
Analog filter
a
10 kHz, 2-pole, low-pass
Butterworth 10 kHz, 2-pole, low-pass
Butterworth 40 kHz smoothing filter
Output current ±1 mA maximum load (10 V
across 10 K) ±3 mA maximum load (
10 V across 3.3 K) ±2 mA maximum load (
3 V across 1.5 K)
Output FIFO 8192 Samples, total 8192 Samples, total 8192 Samples, total
Idle channel noise
(216 kSPS)
600
μ
VRMS 100
μ
VRMS 30
μ
VRMS
Total Harmonic Distortion, THD
b
–1 dBFS, 1 kHz output,
10 k
Ω
load:
–6 dBFS, 1 kHz output,
10 k
Ω
load:
–80 dB
–80 dB
–78 dB
–78 dB
–97 dB
–100 dB
Spurious Free Dynamic Range,
SFDR
b
–1 dBFS, 1 kHz output,
10 k
Ω
load:
–6 dBFS, 1 kHz output,
10 k
Ω
load:
84 dBFS
86 dBFS
88 dBFS
88 dBFS
100 dBFS
109 dBFS
Offset error ±1.5 mV ±1.5 mV ±1.5 mV
Offset error temperature
coefficient 200
μ
V/
°
C 200
μ
V/
°
C 200
μ
V/
°
C
Gain error ±3.0% ±0.03% ±0.03%