Datasheet

LMH0387
SNLS315G –APRIL 2010–REVISED APRIL 2013 www.ti.com
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 V
CCTX
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 4.7μF).
17 TERM
RX
I, SDI Termination for unused receiver (equalizer) input. This network should consist of a 1.0
µF capacitor followed by a 220Ω 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.
19, 24, 25, 31, V
EE
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 CD
THRESH
I, Analog Carrier detect threshold input. Sets the threshold for CD. CD
THRESH
may be either
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 V
CCRX
Power Positive power supply for receiver (+3.3V).
33, 34 SDI, SDI I, SDI Serial data differential input for transmitter (cable driver).
36 R
REF
I, Analog BNC_IO output driver level control. Connect a resistor (nominally 715Ω) to V
CC
to set the
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 TERM
TX
O, SDI Termination for unused transmitter (cable driver) output. This network should consist of a
4.7 µF capacitor followed by a 75Ω resistor to ground.
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