AN346

AN346
Maxim > Design Support > Technical Documents > Application Notes > Communications Circuits > APP 346
Maxim > Design Support > Technical Documents > Application Notes > T/E Carrier and Packetized > APP 346
Keywords: T1, E1, DS2152DK, DS2154DK
APPLICATION NOTE 346
Converting the DS2152/DS2154 Demo Kits
May 15, 2001
Abstract: This application note provides the instruction to convert the Dallas Semiconductor/Maxim
DS2152/DS2154 T1/E1 demo kits.
The DS2152DK & DS2154DK are ordered and shipped for either T1 or E1 operation. However, the kits
are easily converted to the other mode.
To convert from DS2152DK to DS2154DK: T1→
1. Place DS2154 in location marked U1.
2. Place 2.048 MHz oscillator in location marked X1.
3. Remove and replace Rr.
4. Cut trace and place Rt, see note 3 below.
To convert from DS2154DK to DS2152DK: E1→
1. Place DS2152 in location marked U1.
2. Place 1.544 MHz oscillator in location marked X1.
3. Remove and replace Rr.
4. Remove Rt and solder wire in place.
The table below details the required components.
Component
Description
T1
E1
U1
SCT
DS2152
DS2154
X1
OSCILLATOR¹
1.544 MHz
2.049 MHz
R25 & R26
Rt
0Ω², ³
9,2Ω²
R33 & R34
Rr
50Ω
37.5Ω for 75 Ohm Termination
60Ω for 120 Ohm Termination
Notes:
1. Recommended oscillators: NTH039A-1.544000 & NTH039A-2.04800.
Saronix
151 Laura Lane
Palo Alto, CA 94303
Page 1 of 2
Phone: (415) 856-6900
Fax: (415) 856-4732
http://www.saronix.com
2. The DS2152DK and DS2154DK are both shipped with a 1:1.15 transformer (PE-65388) in the
transmit path.Some of the configurations in the data sheets specify a 1:1.36 transformer, PE-64937
is a 1:1.36 transformer available from Pulse Engineering.
Pulse Engineering
P.O. Box 12236
San Diego, CA 92112
Phone: (619) 674-8100
Fax: (619) 674-8262
http://www.pulseeng.com
3. The DS2152DK is shipped without R25 & R26, the kit is configured with Rt=0Ω by shorting the path
on the printed circuit board. In order to place resistors, Rt≠0, the traces must be cut. The locations
to cut can be found by turning the PCB over and locating the trace that connects the through holes
at either end of the R25 & R26 resistors. Carefully cut them with an X-acto knife, and solder the
resistors in place on the top side of the PCB.
Related Parts
DS2152
Enhanced T1 Single Chip Transceiver
DS2152
Enhanced T1 Single Chip Transceiver
DS2154
Enhanced E1 Single Chip Transceiver
DS2154
Enhanced E1 Single Chip Transceiver
More Information
For Technical Support: http://www.maximintegrated.com/support
For Samples: http://www.maximintegrated.com/samples
Other Questions and Comments: http://www.maximintegrated.com/contact
Application Note 346: http://www.maximintegrated.com/an346
APPLICATION NOTE 346, AN346, AN 346, APP346, Appnote346, Appnote 346
Copyright © by Maxim Integrated Products
Additional Legal Notices: http://www.maximintegrated.com/legal
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