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參數(shù)資料
| 型號： | 73K224L-IGT |
| 廠商： | TDK Corporation |
| 英文描述： | V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem |
| 中文描述： | V.22bis/V.22/V.21 /貝爾212A/Bell 103單芯片調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 26/32頁 |
| 文件大?。?/td> | 206K |
| 代理商： | 73K224L-IGT |
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73K224L
V.22bis/V.22/V.21/Bell 212A/Bell 103
Single-Chip Modem
26
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
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
constant and the receive signal is unaffected.
resistor
and
the
remains
relatively
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. Unlike digital
logic circuitry, modem designs must properly
contend with precise frequency tolerances and
very
low
level
analog
acceptable performance. Using good analog
circuit design practices will generally result in a
sound
design.
Following
recommendations which should be taken into
consideration when starting new designs.
easy
to
control
as
signals,
to
ensure
are
additional
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
V250L20
T
R
4U2
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
7C5
20R9
20R8
-
+
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 |
|---|---|
| 73K224L-IH | V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem |
| 73K224L-IP | V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem |
| 73K321L-IH | CCITT V.23, V.21 Single-Chip Modem |
| 73K321L-IP | CCITT V.23, V.21 Single-Chip Modem |
| 73K321L | Miniature Switch, High Precision |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 73K224L-IH | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem |
| 73K224L-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 |
| 73K224L-IHR/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 |
| 73K224L-IP | 功能描述:電信集成電路 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 |
| 73K224L-IP/F | 功能描述:電信集成電路 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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