參數(shù)資料
型號(hào)： 73K324L
廠商： Electronic Theatre Controls, Inc.
英文描述： EMBASE
中文描述： 國(guó)際電話電報(bào)諮詢委員會(huì)V.22bis，.22，.21，.23，貝爾212A章單芯片調(diào)制解調(diào)器
文件頁(yè)數(shù)： 25/31頁(yè)
文件大?。?/td> 183K
代理商： 73K324L
73K324L
CCITT V.22bis, V.22, V.21, V.23, Bell 212A
Single-Chip Modem
25
APPLICATIONS INFORMATION
(continued)
DIRECT ACCESS ARRANGEMENT (DAA)
The telephone line interfaces show two examples of
how the “hybrid” may be implemented. The split
supply design (Figure 1) is a typical two op-amp
hybrid. The receive op-amp serves two purposes. It
supplies gain to amplify the receive signal to the
proper level for the modem’s detectors and
demodulator, and it removes the transmitted signal
from the receive signal present at the transformer.
This is done by supplying a portion of the
transmitted signal to the non-inverting input of the
receive op-amp at the same amplitude as the signal
appearing at the transformer, making the transmit
signal Common mode.
The single-supply hybrid is more complex than the
dual-supply version described above, but its use
eliminates the need for a second power supply. This
circuit (Figure 2) uses a bridged drive to allow
undistorted signals to be sent with a single 5 volt
supply.
Because DTMF tones utilize a higher amplitude than
data, these signals will clip if a single-ended drive
approach is used. The bridged driver uses an extra
op-amp (U1A) to invert the signal coming from the
gain setting op-amp (U1B) before sending it to the
other leg of the transformer. Each op-amp then
supplies half the drive signal to the transformer. The
receive amplifier (U1C) picks off its signal at the
junction of the impedance matching resistor and the
transformer. Because the bottom leg of the
transformer is being driven in one direction by U1A
and the resistor is driven in the opposite direction at
the same time by U1B, the junction of the
transformer and resistor remains relatively constant
and the receive signal is unaffected.
DESIGN CONSIDERATIONS
TDK Semiconductor's 1-chip modem products
include all basic modem functions. This makes these
devices adaptable for use in a variety of
applications, and as easy to control as conventional
digital bus peripherals.
FIGURE 2: Single 5V Hybrid Version
RXA
-
+
R4
37.4K 1%
C1
390 pF
TXA
C10
0.47 μF
250V
IND1
R12
22K
MIT1
671-8005
VR1
MOV
V250L20
T
R
4U2
U1C
*
R2
20K 1%
0.C6
+5V
+
-
U1B
*
+5V
K1
D4
IN914
2N2222A
Q1
R14
10K
10
9
8
R1
20K 1%
47R3
7
6
5
4
11
R5 3.3K
C4
0.0047 μF
2R6
R7
20K 1%
C3
0.1 μF
C5
750 pF
R9
20K 1%
R8
20K 1%
-
+
U1A
*
1
3
2
C2
0.033 μF
3.3V
ZENERS
D2
D3
+5V
R13
22K
+5V
C7
0.1 μF
C8
10 μF
HOOK
RING
RVOLTAGE
R10
*
R11
*
+
Note: Op-amp U1
must be rated for
single 5V operation.
R10 & R11 values
depend on Op-amp
相關(guān)PDF資料
PDF描述
73K324L-28IH COSSE
73K324L-IGT CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem
73K324L-IP CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem
73M2910L Microcontroller
73M2921 Advanced Single Chip Modem
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
73K324L-28IH 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem
73K324L-28IH/F 功能描述:電信集成電路 Modem Data Pump V.21-23 & V.22Bis RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray
73K324L-28IHR/F 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Single-Chip Modem
73K324L-IGT 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem
73K324L-IHR/F 功能描述:電信集成電路 K-Series Modem w/Integrated Hybrid RoHS:否 制造商:STMicroelectronics 類型:Telecom IC - Various 工作電源電壓:4.75 V to 5.25 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-100 封裝:Tray
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