mt9075bpr1 Zarlink Semiconductor, mt9075bpr1 Datasheet - Page 9

• Manufacturer Part Number: mt9075bpr1
• Description: E1 Single Chip Transceiver With Liu
• Manufacturer: Zarlink Semiconductor

bit, LLOS (bit 4 in page 3, register 18H) is provided to indicate the presence of a loss signal condition. The
occurrence of a loss signal condition is defined as per I.431, i.e., when the incoming signal amplitude is more than
20 dB below the nominal amplitude for a time duration of at least 1 ms.
The receive LIU circuit requires a terminating resistor of either 120 Ω or 75 Ω across the device side of the
receive1:1 transformer as shown in Figure 4. The return loss of the receiver, complying with G.703, is greater
than:
•
•
•
The jitter tolerance of the MT9075B clock extractor circuit exceeds the requirements of G.823 (Figure 3).
Transmitter
The MT9075B differential line driver is designed to drive a 1:2 step-up transformer (see Figure 4). A 0.68 uF
capacitor is required between the TTIP and the transmit transformer. Resistors R
termination for transmit return loss. The values of R
intermediary value to serve both applications. Program the Transmit Pulse Control Word (address 1FH page 1) to
adjust the pulse amplitude accordingly. Alternatively, the pulse level and shape may be discretely programmed by
writing to the Customer Pulse Level registers (addresses 1CH to 1FH, page 2) and setting the Custom Transmit
Pulse bit high (bit 3 of the Transmit Pulse Control Word).
12 dB from 51 kHz to 102 kHz;
18 dB from 102 kHz to 2048 kHz;
14 dB from 2048 kHz to 3072 kHz.
18UI
1.5UI
0.2UI
Jitter Amplitude
Peak to Peak
(log scale)
1.667Hz
Figure 3 - Typical Jitter Tolerance
20Hz
Zarlink Semiconductor Inc.
MT9075B
T
may be optimized for 120 Ω lines, 75 Ω lines or set at an
9
2.4kHz 18kHz 100kHz
Tolerance
MT9075B
Jitter Frequency
(log scale)
T
(as shown in Figure 4) are for
Data Sheet