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The LXT304A is a fully integrated low-power transceiver
for both North American 1.544 Mbps (T1), and International 2.048 Mbps (E1) applications. It features a constant
low output impedance transmitter allowing for high transmitter return loss in T1/E1 applications. Transmit pulse
shapes (DSX-1 or E1) are selectable for various line
lengths and cable types.
The LXT304A provides receive jitter attenuation starting
at 3 Hz, and is microprocessor controllable through a serial
interface.
It offers a variety of diagnostic features including transmit
and receive monitoring. The device incorporates an onchip crystal oscillator, and also accepts digital clock inputs.
It uses an advanced double-poly, double-metal CMOS process and requires only a single 5-volt power supply.
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Jitter attenuation of the LXT304A clock and data outputs is
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Store (ES). An external crystal oscillating at 4 times the bit
rate provides clock stabilization. Refer to Application
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recovered clock signal, and clocked out of the ES with the
dejittered clock from the JAL. When the bit count in the ES
is within two bits of overflowing or underflowing, the ES
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The transceiver incorporates a Driver Performance Monitor (DPM) in parallel with TTIP and TRING at the output
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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Figure 5 is a 2.048 Mbps E1 TWP application using 15 Ω
Rt resistors in line with the transmit transformer to provide
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Existing D4 Channel Bank architectures frequently employ: (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 compatible, 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-
isting dual-card architectures. With an appropriate output
transformer, the LXT304A can produce full 6.0 V peak amplitude pulses suitable for D4 Channel Bank applications
with separate pulse shaping/LBO cards.
To achieve the 6.0 V peak output, the FCC Part 68-010
Equalizer Code setting is used. (EC = 010.) With the standard 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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ìï Power dissipation while driving 75 Ω load over operating temperature range. Includes device and load. Digital input levels 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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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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