GS2978CNE3 GENNUM, GS2978CNE3 Datasheet - Page 9

• Manufacturer Part Number: GS2978CNE3
• Description: IC SLEW RATE CABLE DRIVER 2.97GBPS QFN16
• Manufacturer: GENNUM

Specifications of GS2978CNE3

• Supply Voltage Range: 3.135V To 3.465V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: QFN
• No. Of Pins: 16
• Termination Type: SMD
• Control Interface: Serial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.2.1 Output Amplitude (RSET)
4.2.2 Output Disable
4.3 Output Return Loss Measurement
The output amplitude of the GS2978 can be adjusted by changing the value of the
R
tolerance, a value of 750Ω is required. A ±1% SMT resistor should be used.
The R
resistor should be placed as close as possible to the R
capacitance should be minimized at this node by removing the PCB groundplane
beneath the R
Table 4-1: R
The serial output disable (DISABLE), disables power to the current mode serial
digital output driver. When asserted LOW, the SDO/SDO output driver is powered
off. SDO/SDO will float to V
To perform a practical return loss measurement, it is necessary to force the
GS2978 output to a DC high or low condition. The actual measured return loss will
be based on the outputs being static at V
conditions the outputs of the device swing between V
37186 - 5
NOTE: For reliable operation of the GS2978 over the full temperature range, do not use an R
value below 573Ω.
SET
resistor as shown in
SET
resistor is part of the high speed output circuit of the GS2978. The
October 2007
SET
SET
R
SET
vs V
resistor and the R
995
824
750
680
573
R (Ω)
OD
Table
CC
through the pull-up resistor.
4-1. For an 800mV
SET
pin.
CC
or V
CC
Output Swing (mVp-p)
-1.6V. Under normal operating
p-p
SET
CC
output with a nominal ±7%
GS2978 Data Sheet
-0.4V and V
pin. In addition, the PCB
1040
608
734
800
884
CC
-1.2V.
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SET