DS26521L+ Maxim Integrated Products, DS26521L+ Datasheet - Page 210

• Manufacturer Part Number: DS26521L+
• Description: IC TXRX T1/E1/J1 64-LQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS26521L+

• Number Of Drivers/receivers: 1/1
• Protocol: T1/E1/J1
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Product: Framer
• Number Of Transceivers: 1
• Data Rate: 44.736 Mbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 220 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bits 5 and 4: Receive Impedance Match 1 and 0 (RIMPM[1:0]).These bits are used to select the receive
impedance match value. These must be set according to the cable impedance. Even if the internal receive match
impedance is turned off (RIMPOFF); the external cable impedance must be specified for optimum operation by
RIMPM1 to 0. See
Bits 1 and 0: Receiver Sensitivity/Monitor Gain Select 1 and 0 (RSMS[1:0]). These bits are used to select the
receiver sensitivity level and additional gain in monitoring applications. The monitor mode (RMONEN) adds
resistive gain to compensate for the signal loss caused by the isolation resistors. See
Table 9-18. Receive Impedance Selection
Bit 7: Receive G.703 Clock Enable (RG703). If this bit is set, the receiver expects a 2.048MHz or 1.544MHz
clock from the RTIP/RRING, based on the selection of T1 (1.544) or E1 (2.048) mode in the
Bit 6: Receive Impedance Termination Off (RIMPOFF).
Bit 3: Receiver Turns Ratio (RTR).
Bit 2: Receiver Monitor Mode Enable (RMONEN).
RIMPM[1:0]
0 =
1 =
0 = Receive transformer turns ratio is 1:1.
1 = Receive transformer turns ratio is 2:1. This option should only be used in short-haul applications.
0 = Disable receive monitor mode.
1 = Enable receive monitor mode. Resistive gain is added with the maximum sensitivity. The receiver
sensitivity is determined by RSMS1 and RSMS0.
00
01
10
11
Receive terminating impedance match is enabled.
Receive terminating impedance match is disabled.
RG703
7
0
Table
RIMPOFF
9-18.
LRISMR
LIU Receive Impedance and Sensitivity Monitor Register
1007h
RECEIVE IMPEDANCE
6
0
SELECTED (Ω)
100
110
120
75
RIMPM1
5
0
RIMPM0
210 of 258
4
0
RTR
3
0
DS26521 Single T1/E1/J1 Transceiver
RMONEN
2
0
Table 9-19
LTRCR
RSMS1
1
0
and
register.
Table
RSMS0
9-20.
0
0