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參數(shù)資料
| 型號： | 73K222AU |
| 廠商： | TDK Corporation |
| 英文描述： | Single-Chip Modem Modem with UART |
| 中文描述： | 單芯片調(diào)制解調(diào)器調(diào)制解調(diào)器與異步 |
| 文件頁數(shù)： | 22/28頁 |
| 文件大?。?/td> | 160K |
| 代理商： | 73K222AU |
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73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip
22
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 5V 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
conventional digital bus peripherals.
easy
to
control
as
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
5.1-6.2V
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.
FIGURE 2: Single 5V Hybrid Version
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 73K222AU-IH | Single-Chip Modem Modem with UART |
| 73K222AU-IP | Single-Chip Modem Modem with UART |
| 73K222BL | V.22, V.21, Bell 212A,Bell 103 Single-Chip Modem with Integrated Hybrid(V.22, V.21, Bell 212A,Bell 103,帶混合電路的單片Modem) |
| 73K224BL | V.22bis/V.22/V.21/Bell 212A/103 Single-Chip Modem w/ Integrated Hybrid(V.22bis/V.22/V.21/Bell 212A/103單片Modem w/ 集成混合電路) |
| 73K224L | V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 73K222AU-IH | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:Single-Chip Modem Modem with UART |
| 73K222AU-IP | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:Single-Chip Modem Modem with UART |
| 73K222BL | 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Single-Chip Modem |
| 73K222BL-IGT | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:V.22, V.21, Bell 212A, Bell 103 Single-Chip Modem with Integrated Hybrid |
| 73K222BL-IH | 制造商:TDK 功能描述:73K222BL-IH |
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