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8T49N242_16 Datasheet, PDF (57/63 Pages) Integrated Device Technology – FemtoClock NG Universal Frequency Translator | |||
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Example 2. Common Customer Configuration (2.5V Core Voltage)
Output
Q0
Q1
Q2
Q3
Output Type
LVPECL
LVDS
HCSL
LVCMOS
Frequency (MHz)
156.25
125
125
25
VCCO
2.5
2.5
2.5
2.5
⢠Core Supply Current + Control and Status Supply Current = ICC + ICCCS = 52mA (max)
⢠Analog Supply Current, ICCA = 116mA (max)
⢠Output Supply Current:
Q0 Current = 156.25 * 0.00476 + 28.1 = 28.84mA
Q1 Current = 125 * 0.00496 + 36.3 = 36.92mA
Q2 Current = 125 * 0.00448 + 28.2= 28.76mA
Q3 Current = 26.2mA
⢠Total Output Supply Current = 120.72mA (max)
⢠Total Device Current = 52mA + 116mA + 120.72mA = 288.72mA
⢠Total Device Power = 2.625V * 288.72mA = 757.89mW
⢠Power dissipated through output loading:
LVPECL = 27.95mW * 1 = 27.95mW
LVDS = already accounted for in device power
HCSL = 45.5mW * 1 = 44.5mW
LVCMOS = 10.5pF * 25MHz * (2.625V)2 * 1 output pair = 1.81mW
⢠Total Power = 757.89mW + 27.95mW + 44.5mW + 1.81mW = 832.15mW or 0.832W
With an ambient temperature of 85°C and no airflow, the junction temperature is:
TJ = 85°C + 26.3°C/W * 0.832W = 106.9°C
This is below the limit of 125°C.
8T49N242 Datasheet
©2016 Integrated Device Technology, Inc.
57
Revision 6, November 1, 2016
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