MXL1344ACAG Просмотр технического описания (PDF) - Maxim Integrated

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MXL1344ACAG

+5V Multiprotocol, Software-Selectable Cable Terminator

Maxim Integrated 

+5V Multiprotocol, Software-Selectable

Cable Terminator

A

A

I

AMMETER

VDM = ±2V

R1 = 52Ω

S1 ON

R3 = 127Ω

S2 OFF

R2 = 52Ω

B

VCM = ±7V OR ±2V

RDM

=

VDM

I

Figure 1. V.11 or V.35 Differential Impedance Measurement

R1 = 52Ω

AMMETER

I

VCM = ±2V

RCM

=

VCM

I

S1 ON

R3 = 127Ω

S2 ON

R2 = 52Ω

B

Figure 2. V.35 Common-Mode Impedance Measurement

1 M0

24 M1

MXL1344A

23 M2

22 DCE/DTE

21 LATCH

VCC VEE

14 2

3 8 11 12 13

12 34 5 6

5 4 6 7 9 10 16 15 18 17 19 20

Figure 3. Block Diagram

chipset must be used without substituting other manu-

facturer's parts on a chip-by-chip basis.

Termination Modes

The termination networks in the MXL1344A can be set

to one of three modes, V.11, V.35, or high impedance

(high-Z). As shown in Figure 4, in V.11 mode, switch S1

is closed and switch S2 is open, presenting 104Ω

across terminals A and B. In V.35 mode, switches S1

and S2 are both closed, presenting a T-network with

104Ω differential impedance and 153Ω common-mode

impedance. In high-Z mode, switches S1 and S2 are

both open, presenting a high impedance across termi-

nals A and B suitable for V.28 and V.10 modes.

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