LXT304ANI [LevelOne]
PCM Transceiver, 1-Func, CMOS, PDIP28, DIP-28;型号: | LXT304ANI |
厂家: | LEVEL ONE |
描述: | PCM Transceiver, 1-Func, CMOS, PDIP28, DIP-28 |
文件: | 总18页 (文件大小:346K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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The LXT304A is a fully integrated low-power transceiver
for both North American 1.544 Mbps (T1), and Interna-
tional 2.048 Mbps (E1) applications. It features a constant
low output impedance transmitter allowing for high trans-
mitter return loss in T1/E1 applications. Transmit pulse
shapes (DSX-1 or E1) are selectable for various line
lengths and cable types.
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The LXT304A provides receive jitter attenuation starting
at 3 Hz, and is microprocessor controllable through a serial
interface.
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It offers a variety of diagnostic features including transmit
and receive monitoring. The device incorporates an on-
chip crystal oscillator, and also accepts digital clock inputs.
It uses an advanced double-poly, double-metal CMOS pro-
cess and requires only a single 5-volt power supply.
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RRING
Jitter
Attenuator
RPOS
RNEG
Data Latch
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Transmit
MTIP
Driver
Control
Receive
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rate provides clock stabilization. Refer to Application
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transformer. The DPM output goes High upon detection of
63 consecutive zeros. It is reset when a one is detected on
the transmit line, or when a reset command is received.
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The LXT304A can be controlled through hard-wired pins
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manded to operate in one of several diagnostic modes.
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valid, relative to the Serial Clock (SCLK) or RCLK as
listed in Table 3.
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for the Reset function. This configuration is illustrated
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Figure 5 is a 2.048 Mbps E1 TWP application using 15 Ω
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loss is not a critical factor, a 1:1 or 1:1.26 transformer with-
out in-line resistors provides maximum power savings. The
LXT304A is shown in Hardware Mode with a typical E1/
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transformer, the LXT304A can produce full 6.0 V peak am-
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with separate pulse shaping/LBO cards.
Existing D4 Channel Bank architectures frequently em-
ploy: (1) a plug-in card for T1 pulse generation (6.0 V
peak); and (2) a separate card for pulse shaping and Line
Build-Out (LBO). The LXT304A integrates the functions
of both cards on a single chip producing a DSX-1 compat-
ible, 3.0 V peak output pulse with a standard transformer.
In new designs, the LXT304A can replace two cards with
one. However, the LXT304A is also compatible with ex-
To achieve the 6.0 V peak output, the FCC Part 68-010
Equalizer Code setting is used. (EC = 010.) With the stan-
dard 1:1.15 transformer, this code produces a 3.0 V peak
pulse. However, doubling the transformer turns ratio to
1:2.30 produces the desired 6.0 V peak pulse.
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1.Transformer turns ratio accuracy is ± 2%.
2. Rr and Rt values are ± 1%.
3. Typical return loss, 51 kHz to 3.072 MHz band.
4.D4 Channel Bank application.
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2. Functionality of pins 23 and 25 depends on mode. See Host/Hardware Mode descriptions.
3.Output drivers will output CMOS logic levels into CMOS loads.
4. Except MTIP and MRING ILL = ± 50 µA.
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els are within 10% of the supply rails and digital outputs are driving a 50 pF capacitive load.
2. Functionality of pins 23 and 25 depends on mode. See Host/Hardware Mode descriptions.
3.Output drivers will output CMOS logic levels into CMOS loads.
4. Except MTIP and MRING ILL = ± 50 µA.
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