Analog Signal Output - Analog Devices adsp-2100 Manual

8 Analog Interface
8.5.2
The ADSP-21msp58/59's differential analog output (VOUT
produced by an on-chip differential amplifier. The differential amplifier
will meet dynamic specifications for loads greater than 2 kΩ (R
and has a maximum differential output voltage swing of ±3.156 V peak-to-
peak (3.17 dBm0). The DAC will drive loads smaller than 2 kΩ, but with
degraded dynamic performance. The differential output can can be
ac-coupled directly to a load or dc-coupled to an external amplifier.
Figure 8.7 shows a simple circuit providing a differential output with ac
coupling. The capacitor of this circuit (C
can be chosen as follows:
C =
OUT
The VOUT
use either as a single-ended output. Figure 8.8 shows an example circuit
which can be used to convert the differential output to a single-ended
output. The circuit uses a differential-to-single-ended amplifier, the
Analog Devices SSM-2141.
C
OUT
R
L
C
OUT
Figure 8.7 Example Circuit For Differential Output With AC Coupling
8 – 18

Analog Signal Output

1
60πR
L
– VOUT outputs must be used as differential outputs; do not
P N
ADSP-21msp5x
VOUT
P
VOUT
N
) is optional; if used, its value
OUT
– VOUT ) is
P N
≥ 2 kΩ)
L