Datasheet

BYPASS (JP7)

JP7 allows control of the equalization BYPASS function. To put the device into bypass mode, set the jumper to pull

BYPASS to VCC. To turn off bypass (for normal operation) set the jumper to pull BYPASS to GND. The LMH0384

BYPASS pin has an internal pulldown (to disable bypass), so JP7 may be left unconnected for normal operation.

AUTO SLEEP (JP8)

JP8 allows control of the AUTO SLEEP function. To put the device into auto sleep mode in which it will power

down when no input is detected, set the jumper to pull AUTO SLEEP to VCC. To turn off auto sleep and prevent

the LMH0384 from automatically powering down, set the jumper to pull AUTO SLEEP to GND. The LMH0384

AUTO SLEEP pin has an internal pullup (to enable auto sleep), so JP8 may be left unconnected to enable auto

sleep mode.

SPI Header (JP9)

JP9 is the SPI (Serial Peripheral Interface) header. It allows access to the SPI pins ( SS

¯¯¯

, MISO, MOSI, and SCK)

while the LMH0384 is in SPI mode. These pins may be connected to a standard SPI controller to access the

LMH0384 SPI registers. Refer to the LMH0384 datasheet for details.

Carrier Detect LED (D1)

D1 shows the status of Carrier Detect. This LED is GREEN when an input signal has been detected, and OFF

when no input is detected. D1 shows the status of Carrier Detect while in Pin Mode or SPI Mode.

Typical Performance

Figures 4 and 5 show typical output waveforms of the SD384, with the 1m of Belden 1694A cable on the input and

110m of Belden 1694A cable on the input, respectively. The input signal is a 2.97 Gbps PRBS10, and the output

signal is measured on the Agilent DCA-J 86100C Oscilloscope.

Figure 4. SD384 Output Waveform at 2.97 Gbps with 1m Belden 1694A Cable

SD384 EVK User Guide 3 of 5