LMH0387SL Datasheet, PDF (4/23 Pages) Texas Instruments – LMH0387 3 Gbps HD/SD SDI Configurable I/O Adaptive Cable Equalizer / Cable Driver

LMH0387
SNLS315G – APRIL 2010 – REVISED APRIL 2013
Pin
1, 4-7, 9–16,
42, 46-48
2, 3, 43
8
Name
RSVD
V_CCTX
BNC_IO
17
TERM_RX
18
SPI_EN
I/O, Type
N/A
Power
I/O, SDI
I, SDI
I, LVCMOS
19, 24, 25, 31, V_EE
32, 35, 37, 41
20, 21
AEC+, AEC-
Power
I/O, Analog
22
CD
O, LVCMOS
23
26
27, 28
29
30
33, 34
36
38
39
40
CD_THRESH
SS (SPI)
SDO, SDO
MISO (SPI)
V_CCRX
SDI, SDI
R_REF
SCK (SPI)
MOSI (SPI)
TX_EN
I, Analog
I, LVCMOS
O, LVDS
O, LVCMOS
Power
I, SDI
I, Analog
I, LVCMOS
I, LVCMOS
I, LVCMOS
44
SD/HD
I, LVCMOS
45
TERM_TX
O, SDI
PIN DESCRIPTIONS
Description
Do not connect.
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Positive power supply for transmitter (+3.3V).
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).
Termination for unused receiver (equalizer) input. This network should consist of a 1.0
µF capacitor followed by a 220Ω resistor to ground.
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.
Negative power supply (ground).
AEC loop filter external capacitor for equalizer (1.0 µF connected between AEC+ and
AEC-).
Carrier detect for BNC_IO pin.
H = No input signal detected on BNC_IO pin.
L = Input signal detected on BNC_IO pin.
Carrier detect threshold input. Sets the threshold for CD. CD_THRESH may be either
unconnected or connected to ground for normal CD operation.
SPI slave select. This pin has an internal pullup.
Serial data differential output from receiver (equalizer).
SPI Master Input / Slave Output. LMH0387 control data transmit.
Positive power supply for receiver (+3.3V).
Serial data differential input for transmitter (cable driver).
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.
SPI serial clock input.
SPI Master Output / Slave Input. LMH0387 control data receive.
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.
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).
Termination for unused transmitter (cable driver) output. This network should consist of a
4.7 µF capacitor followed by a 75Ω resistor to ground.
4
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