ML6692CH Просмотр технического описания (PDF) - Micro Linear Corporation

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ML6692CH

100BASE-TX Physical Layer with MII

Micro Linear Corporation 

ML6692

PIN DESCRIPTION (Continued)

37 (36)

RTSET

Transmit level bias resistor input. An external 2.49kW, 1% resistor connected between

RTSET and AGND3 sets a precision constant bias current for the twisted pair transmit

level.

38 (37, 38)

AGND3

Analog ground.

39, 40 (39, 40) TPOUTN/P Transmit twisted pair outputs. This differential current output pair drives FLP waveforms

and MLT-3 waveforms into the network coupling transformer in 100BASE-TX mode, or

10BASE-T waveforms in 10BASE-T mode.

41 (41, 42)

AGND2

Analog ground.

42 (43)

AVCC2

Analog +5V power supply.

43 (44)

LINK100

100BASE-TX link activity open-drain output. LINK100 pulls low when there is 100BASE-

TX activity at TPINP/N in 100BASE-TX or auto-negotiation modes. This output is capable

of driving an LED directly.

44, 45 (45, 46) TPINN/P

Receive twisted pair inputs. This differential input pair receives 100BASE-TX, FLP, or

10BASE-T signals from the network.

46 (47)

47 (48)

CMREF

DUPLEX

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

for the twisted-pair media line receiver, typically (VCC – 1.26)V.

Full duplex enabled TTL output. This output is high during the auto-negotiation process,

it’s low when auto-negotiation is reset (power-up, reset bit, restart auto-negotiation bit,

power down bit, or link loss) and follows the duplex status otherwise. It drives the

ML2653’s FD input, and prevents the ML2653 from attempting to transmit during auto-

negotiation. For 10BASE-T transceivers without pin-selectable MAU loopback disable,

DUPLEX can be used to disable the 10BASE-T transceiver’s receive and collision outputs

to the controller during auto-negotiation.

48, 49 (50, 51) 10BTTXINN/P 10BASE-T transmit waveform inputs. The ML6692 presents a linear copy of the input at

10BTTXINP/N to the TPOUTP/N outputs when the ML6692 functions in 10BASE-T mode.

Signals presented to these pins must be centered at VCC/2 and have a single ended

amplitude of ±0.25V.

50 (53)

51 (54)

52 (55)

10BTRCV 10BASE-T receive activity TTL input. The external 10BASE-T transceiver drives this pin

high to indicate 10BASE-T packet reception from the network.

10BTLNKEN 10BASE-T link control TTL output. This output is low if the ML6692 is in 10BASE-T mode,

or if the auto-negotiation function indicates to the 10BASE-T PMA to scan for carrier. This

output is high if the 10BASE-T PMA should be disabled.

AVCC1

Analog +5V power supply.

6

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