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OP162GSZ bảng dữ liệu(PDF) 17 Page - Analog Devices

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Data Sheet
OP162/OP262/OP462
Rev. H | Page 17 of 20
Figure 45. Positive Slope Settling Time
Figure 46. Negative Slope Settling Time
DIRECT ACCESS ARRANGEMENT
Figure 47 shows a schematic for a 5 V single-supply transmit/
receive telephone line interface for 600 Ω transmission systems.
It allows full-duplex transmission of signals on a transformer-
coupled 600 Ω line. Amplifier A1 provides gain that can be
adjusted to meet the modem output drive requirements. Both
A1 and A2 are configured to apply the largest possible differential
signal to the transformer. The largest signal available on a single
5 V supply is approximately 4.0 V p-p into a 600 Ω transmission
system. Amplifier A3 is configured as a difference amplifier to
extract the receive information from the transmission line for
amplification by A4. A3 also prevents the transmit signal from
interfering with the receive signal. The gain of A4 can be adjusted
in the same manner as A1 to meet the modem’s input signal
requirements. Standard resistor values permit the use of SIP
(single in-line package) format resistor arrays. Couple this with
the OP462 14-lead SOIC or TSSOP package and this circuit
offers a compact solution.
Figure 47. Single-Supply Direct Access Arrangement for Modems
10
0%
100
90
1µs
5mV
2V
10
0%
100
90
10
0%
100
90
1µs
2V
5mV
6.2V
6.2V
TRANSMIT
TXA
RECEIVE
RXA
2k
P1
TX GAIN
ADJUST
A1
A2
A3
A4
A1, A2 = 1/2 AD8532
A3, A4 = 1/2 AD8532
R3
360
Ω
ZO
600
Ω
R1
10k
Ω
R13
10k
Ω
R10
10k
Ω
R9
10k
Ω
R11
10k
Ω
C2
0.1
µF
C1
0.1
µF
10
µF
R12
10k
Ω
R7
10k
Ω
R8
10k
Ω
R5
10k
Ω
R6
10k
Ω
R14
14.3k
Ω
R2
9.09k
Ω
1:1
T1
TO TELEPHONE
LINE
1
2
3
7
6
5
2
3
1
6
5
7
P2
RX GAIN
ADJUST
2k
Ω
5V DC
MIDCOM
671-8005



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