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AD28MSP02BR Datasheet(PDF) 8 Page - Analog Devices

Part No. AD28MSP02BR
Description  Voiceband Signal Port
Download  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD28MSP02BR Datasheet(HTML) 8 Page - Analog Devices

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AD28msp02
REV. 0
–8–
To select values for the components shown in Figure 7, use the
following equations:
Gain
=
R
FB
R
IN
C
IN =
1
60
π R
IN
C
FB =
1
(2
π)(20 ×10
3
) R
FB
10 k
Ω ≤ R
FB, RIN
≤ 50 kΩ
150 pF
≤ C
FB
≤ 600 pF
Figure 8 shows an example of a typical input circuit configured
for 0 dB gain. The circuit’s diodes are used to prevent the input
signal from exceeding maximum limits.
1.0µF
330pF
INPUT
SIGNAL
VCC
GNDA
MUX
VOLTAGE
REFERENCE
VFBAUX
VINAUX
AD28msp02
20k
10kΩ
10k
VFBNORM
VINNORM
Figure 8. Example Analog Input Circuit for 0 dB Gain
Analog Output
The AD28msp02’s differential analog output (VOUTP, VOUTN)
is produced by an on-chip differential amplifier. The differential
amplifier can drive a minimum load of 2 k
Ω (R
L
≥ 2 kΩ) and
has a maximum differential output voltage swing of
±3.156 V
peak-to-peak (3.17 dBm0). The differential output can be
ac-coupled directly to a load or dc-coupled to an external
amplifier.
Figure 9 shows a simple circuit providing a differential output
with ac coupling. The capacitor of this circuit (COUT) is
optional; if used, its value can be chosen as follows:
C
OUT =
1
(60
π) R
L
C OUT
C OUT
VOUTP
VOUT N
R L
AD28msp02
Figure 9. Example Circuit for Differential Output
The VOUTP–VOUTN outputs must be used as differential out-
puts; do not use either as a single-ended output. Figure 10
shows an example circuit which can be used to convert the dif-
ferential output to a single-ended output. The circuit uses a
differential-to-single-ended amplifier, the Analog Devices
SSM2141.
SSM2141
1
5
7
4
+12 V
0.1
µF
0.1
µF
–12 V
V
OUT
AD28msp02
VOUTP
VOUTN
GNDA
GNDA
GNDA
Figure 10. Example Circuit for Single-Ended Output


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