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參數(shù)資料
| 型號： | 73K322L-IH |
| 廠商： | TDK Corporation |
| 英文描述： | CCITT V.23, V.22, V.21 Single-Chip Modem |
| 中文描述： | 國際電話電報諮詢委員會.23，.22，.21單芯片調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 25/30頁 |
| 文件大?。?/td> | 288K |
| 代理商： | 73K322L-IH |
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73K322L
CCITT V.23, V.22, V.21
Single-Chip Modem
25
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.
FIGURE 2: Single 5V Hybrid Version
RXA
-
+
R4
37.4K 1%
C1
390 pF
TXA
C10
0.47 μF
250V
D1
IN4004
R12
22K
T1
MIDCOM
671-8005
VR1
MOV
V250L20
T
R
U2
4N35
U1C
*
R2
20K 1%
C6
0.1 μF
+5V
+
-
U1B
*
+5V
K1
D4
IN914
2N2222A
Q1
R14
10K
10
9
8
R1
20K 1%
R3
475 1%
7
6
5
4
11
R5 3.3K
C4
0.0047 μF
R6
22.1K
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
VOLTAGE
REFERENCE
R10
*
R11
*
+
* Note: Op-amp U1
must be rated for
single 5V operation.
R10 & R11 values
depend on Op-amp
used.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 73K322L-IP | CCITT V.23, V.22, V.21 Single-Chip Modem |
| 73K322L | CCITT V.23, V.22, V.21 Single-Chip Modem(CCITT V.23, V.22, V.21單片Modem) |
| 73M223 | 1200 Baud FSK Modem |
| 73M223-CL | 1200 Baud FSK Modem |
| 73M223-CP | 1200 Baud FSK Modem |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 73K322L-IP | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:CCITT V.23, V.22, V.21 Single-Chip Modem |
| 73K324BL | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Single-Chip Modem w/ Integrated Hybrid |
| 73K324BL-IGT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Chip Modem w/Integrated Hybrid |
| 73K324BL-IH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Single-Chip Modem w/Integrated Hybrid |
| 73K324BL-IH/F | 功能描述:電信集成電路 Single Chip 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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