DS2148 datasheet(49/73 Pages) MAXIM

Part #	DS2148

Description	5V E1/T1/J1 Line Interface Unit

PDF	73 Pages

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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49 / 73 page

DS2148/DS21Q48

49 of 73

Figure 7-1. Basic Interface

NOTES:

1) All resistor values are ±1%.

2) In E1 applications, the Rt resistors are used to increase the transmitter return loss (Table 7-1). No return loss is required for T1

applications.

3) The Rr resistors should be set to 60

Ω each if the internal receive-side termination feature is enabled. When this feature is disabled, Rr

= 37.5

Ω for 75Ω, 60Ω for 120Ω E1 systems, or 50Ω for 100Ω T1 lines.

4) See Table 7-1 and Table 7-2 for the appropriate transmit transformer turns ratio (N).

RTIP

RRING

TTIP

TRING

Receive

Line

N:1

(larger winding

toward the network)

DS2148

0.47µF

(non

polarized)

VDD (21)

VSS (22)

0.1µF

VDD (36)

VSS (35)

0.1µF

+VDD

0.01µF

2.048MHz

(this clock can also

be 1.544MHz for T1

only applications)

MCLK

1:1

0.1µF

Transmit

Line

10µF

DS2148 Datasheet(PDF) 49 Page - Maxim Integrated Products

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