ML6694 Просмотр технического описания (PDF) - Micro Linear Corporation

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ML6694

100BASE-TX Physical Layer with 5-Bit Interface

Micro Linear Corporation 

ML6694

PIN DESCRIPTION (Continued)

PIN

NAME

DESCRIPTION

39 (33)

CMREF

Receiver common-mode reference output. This pin provides a common-mode bias

point for the twisted-pair media line receiver. A typical value for CMREF is

(VCC–1.26)V.

40,41 (34,35)

42 (36)

10BTTXINN/P 10BASE-T transmit waveform inputs. The ML6694 presents a linear copy of the input

at 10BTTXINN/P to the TPOUTN/P outputs when the ML6694 functions in 10BASE-T

mode. Signals presented to these pins must be centered at VCC/2 with a single ended

amplitude of ± 0.25V.

LPBK

Loopback TTL input pin. Tying this pin to ground places the part in loopback mode;

data at RSM<4:0> are serialized, MLT-3 encoded, equalized then sent to the receive

PLL for clock recovery and sent to the RSM<4:0> outputs. Floating this pin or tying it

to VCC places the part in its normal mode of operation.

43 (37)

AVCC1

Analog +5V power supply.

44 (38)

TXC

Transmit clock TTL input. This 25MHz clock is the frequency reference for the

internal transmit PLL clock multiplier. This pin should be driven by an external

25MHz clock at TTL or CMOS levels.

4

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