DS21552L+ Maxim Integrated Products, DS21552L+ Datasheet - Page 93
DS21552L+
Manufacturer Part Number
DS21552L+
Description
IC TXRX T1 1-CHIP 5V 100-LQFP
Manufacturer
Maxim Integrated Products
Datasheet
1.DS21352L.pdf
(137 pages)
Specifications of DS21552L+
Function
Single-Chip Transceiver
Interface
E1, HDLC, J1, T1
Number Of Circuits
1
Voltage - Supply
4.75 V ~ 5.25 V
Current - Supply
75mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
100-LQFP
Includes
DSX-1 and CSU Line Build-Out Generator, HDLC Controller, In-Band Loop Code Generator and Detector
Product
Framer
Number Of Transceivers
1
Data Rate
64 Kbps
Supply Voltage (max)
3.465 V
Supply Voltage (min)
3.135 V
Supply Current (max)
75 mA (Typ)
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Ic Interface Type
Parallel, Serial
Supply Voltage Range
4.75V To 5.25V
Operating Temperature Range
0°C To +70°C
Digital Ic Case Style
LQFP
No. Of Pins
100
Filter Terminals
SMD
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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16.5 RECEIVE MONITOR MODE
When connecting to a monitor port a large resistive loss is incurred due to the voltage divider between the
T1 line termination resistors (Rt) and the monitor port isolation resistors (Rm) as shown below. The Rm
resistors are typically 470 ohm. This, along with the 100 ohm termination (Rt), produces 20dB of loss.
The receiver of the DS21352/552 can provide gain to overcome the resistive loss of a monitor connection.
This is a purely resistive loss/gain and should not be confused with the cable loss characteristics of a T1
transmission line. Via the TEST2 register as shown in the table below, the receiver can be programmed
to provide both 12dB and 20dB of gain.
Figure 16-8 TYPICAL MONITOR PORT APPLICATION
Table 16-5 RECEIVE MONITOR MODE GAIN
T1 LINE
TEST2 (Address = 09 Hex) Register Value
Rm
72 Hex
70 Hex
MONITOR
PORT JACK
Rm
PRIMARY
T1 TERMINATING
DEVICE
93 of 137
X
F
M
R
SECONDARY T1
TERMINATING
DEVICE
Gain
12dB
20dB
Rt
DS21X52
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