DS26521LN+ Maxim Integrated Products, DS26521LN+ Datasheet - Page 204

• Manufacturer Part Number: DS26521LN+
• Description: IC TXRX T1/E1/J1 64-LQFP
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS26521LN+

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Register Name:
Register Description:
Register Address:
Bit #
Name
Default
Bit 6: Transmit Impedance Off (TIMPTOFF).
Bits 5 and 4: Transmit Load Impedance 1 and 0 (TIMPL[1:0]). These bits are used to select the transmit load
impedance. These must be set to match the cable impedance. Even if the internal load impedance is turned off (via
TIMPTOFF); the external cable impedance must be specified for optimum operation. For J1 applications, use
110Ω. See
Bits 2 to 0: Line Build-Out Select 2 to 0 (L[2:0])
voltage level and load impedance associated with it once the T1/J1 or E1 selection is made by settings in the
LTRCR
Table 9-15. Transmit Load Impedance Selection
Table 9-16. Transmit Pulse Shape Selection
L2
L2
0
0
0
0
0
0
1
1
1
1
TIMPL1
0
0
1
1
L1
L1
0
0
0
0
1
1
0
0
1
1
0 = Enable transmit terminating impedance.
1 = Disable transmit terminating impedance.
register. See
L0
L0
0
1
0
1
0
1
0
1
0
1
Table
TIMPL0
—
7
0
MODE
MODE
T1/J1
T1/J1
T1/J1
T1/J1
T1/J1
T1/J1
T1/J1
T1/J1
9-15.
E1
E1
0
1
0
1
Table
TIMPTOFF
LTITSR
LIU Transmit Impedance and Pulse Shape Selection Register
1001h
DSX-1/0dB CSU, 0ft–133ft ABAM 100Ω
DSX-1, 133ft–266ft ABAM 100Ω
DSX-1, 266ft–399ft ABAM 100Ω
DSX-1, 399ft–533ft ABAM 100Ω
DSX-1, 533ft–655ft ABAM 100Ω
-7.5dB CSU
-15dB CSU
-22.5dB CSU
IMPEDANCE
9-16.
6
0
120Ω
IMPEDANCE SELECTION
75Ω
CABLE LENGTH
TIMPL1
100Ω
110Ω
120Ω
75Ω
5
0
VOLTAGE
NOMINAL
2.37V
3.0V
.
Used to select the transmit waveshape. The waveshape has a
204 of 258
TIMPL0
4
0
CABLE LOSS
—
3
0
ALLOWED
0.6dB
1.2dB
1.8dB
2.4dB
3.0dB
MAX
—
—
—
DS26521 Single T1/E1/J1 Transceiver
L2
2
0
L1
1
0
L0
0
0