Maxim DS33R11 specifications Recommended Circuits -7. Basic Interface, Transformer Specifications

DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver

10.24Recommended Circuits Figure 10-7. Basic Interface

VDD

2:1

TRANSMITC LINE

1:1

RECEIVE

LINE

R

DS33R11		0.1μF	0.01μF
TTIP	DVDD
	DVSS
TRING	TVDD	0.1μF	10μF
			+
RTIP	TVSS
	RVDD	0.1μF	10μF
			+
RRING	RVSS

R

0.1μF

NOTE 1: ALL RESISTOR VALUES ARE ±1%.

NOTE 2: RESISTORS R SHOULD BE SET TO 60Ω EACH IF THE INTERNAL RECEIVE-SIDE TERMINATION FEATURE IS ENABLED. WHEN THIS FEATURE IS DISABLED, R = 37.5Ω FOR 75Ω COAXIAL E1 LINES, 60Ω FOR 120Ω TWISTED-PAIR E1 LINES, OR 50Ω FOR 100Ω TWISTED-PAIR T1 LINES.

NOTE 3: C = 1μF CERAMIC.

Refer to Application Note 324: T1/E1 Network Interface Design for more information on protected interfaces.

Table 10-13. Transformer Specifications

SPECIFICATION	RECOMMENDED VALUE
Turns Ratio 3.3V Applications	1:1 (receive) and 1:2 (transmit) ±2%
Primary Inductance	600μH (min)
Leakage Inductance	1.0μH (max)
Intertwining Capacitance	40pF (max)
Transmit Transformer DC Resistance
Primary (Device Side)	1.0Ω (max)
Secondary	2.0Ω (max)
Receive Transformer DC Resistance
Primary (Device Side)	1.2Ω (max)
Secondary	1.2Ω (max)

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