LMH0387

SNLS315G – APRIL 2010 – REVISED APRIL 2013

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PIN DESCRIPTIONS

Pin

Name

I/O, Type

Description

1, 4-7, 9–16,

RSVD

N/A

Do not connect.

42, 46-48

2, 3, 43

Power

Positive power supply for transmitter (+3.3V).

8

BNC_IO

I/O, SDI

Serial digital interface input or output for connection to a BNC. Connect this pin to the

BNC via an AC coupling capacitor (nominally 4.7

μF).

17

I, SDI

Termination for unused receiver (equalizer) input. This network should consist of a 1.0

µF capacitor followed by a 220

Ω resistor to ground.

18

SPI_EN

I, LVCMOS

SPI register access enable (equalizer). This pin should always be high; it must be pulled

high while operating in the input mode and may optionally be pulled high while operating

in the output mode. This pin has an internal pulldown.

Power

Negative power supply (ground).

32, 35, 37, 41

20, 21

AEC+, AEC-

I/O, Analog

AEC loop filter external capacitor for equalizer (1.0 µF connected between AEC+ and

AEC-).

22

CD

O, LVCMOS

Carrier detect for BNC_IO pin.

H = No input signal detected on BNC_IO pin.

L = Input signal detected on BNC_IO pin.

23

I, Analog

unconnected or connected to ground for normal CD operation.

26

SS (SPI)

I, LVCMOS

SPI slave select. This pin has an internal pullup.

27, 28

SDO, SDO

O, LVDS

Serial data differential output from receiver (equalizer).

29

MISO (SPI)

O, LVCMOS

SPI Master Input / Slave Output. LMH0387 control data transmit.

30

Power

Positive power supply for receiver (+3.3V).

33, 34

SDI, SDI

I, SDI

Serial data differential input for transmitter (cable driver).

36

I, Analog

BNC_IO output driver level control. Connect a resistor (nominally 715

output voltage swing for the BNC_IO pin.

38

SCK (SPI)

I, LVCMOS

SPI serial clock input.

39

MOSI (SPI)

I, LVCMOS

SPI Master Output / Slave Input. LMH0387 control data receive.

40

TX_EN

I, LVCMOS

Transmitter output driver enable. TX_EN has an internal pullup.

H = BNC_IO output driver is enabled.

L = BNC_IO output driver is powered off.

To configure the LMH0387 as a receiver, the BNC_IO output driver must be disabled by

tying TX_EN low. To configure the LMH0387 as a transmitter, the output driver must be

enabled by tying TX_EN high and the receiver may be powered down using the sleep

mode setting via the SPI.

44

SD/HD

I, LVCMOS

BNC_IO output slew rate control. SD/HD has an internal pulldown.

H = BNC_IO output rise/fall time complies with SMPTE 259M (SD).

L = BNC_IO output rise/fall time complies with SMPTE 424M / 292M (3G/HD).

45

O, SDI

Termination for unused transmitter (cable driver) output. This network should consist of a

4.7 µF capacitor followed by a 75

Ω resistor to ground.

4

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