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CS485XX датащи(PDF) 11 Page - Cirrus Logic

номер детали CS485XX
подробное описание детали  32-bit Audio Decoder DSP Family
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS485xx Family Data Sheet
32-bit Audio Decoder DSP Family
DS734F3
Copyright 2009 Cirrus Logic, Inc.
11
CONFIDENTIAL
5.4 Power Supply Characteristics
(Measurements performed under operating conditions)
5.5 Thermal Data (48-Pin LQFP)
1. Two-layer board is specified as a 76 mm X 114 mm, 1.6 mm thick FR-4 material with 1-oz. copper covering 20 % of the top &
bottom layers.
2. Four-layer board is specified as a 76 mm X 114 mm, 1.6 mm thick FR-4 material with 1-oz. copper covering 20 % of the top &
bottom layers and 0.5-oz. copper covering 90 % of the internal power plane & ground plane layers.
3. To calculate the die temperature for a given power dissipation
T
j = Ambient Temperature + [ (Power Dissipation in Watts) *
θ
ja ]
4. To calculate the case temperature for a given power dissipation
T
c = Tj - [ (Power Dissipation in Watts) *
ψ
jt ]
Parameter
Min
Typ
Max
Unit
Operational Power Supply Current:
VDD: Core and I/O operating1
VDDA: PLL operating
VDDIO: With most ports operating
Total Operational Power Dissipation:
Standby Power Supply Current:
VDD: Core and I/O not clocked
VDDA: PLL halted
VDDIO: All connected I/O pins 3-stated by other ICs in system
Total Standby Power Dissipation:
1. Dependent on application firmware and DSP clock speed.
-
-
-
-
-
-
-
203
8
27
480
100
1
50
348
-
-
-
-
-
-
-
mA
mA
mA
mW
μA
μA
μA
μW
Parameter
Symbol
Min
Typ
Max
Unit
Junction Temperature
Tj
-
-
125
°C
Thermal Resistance (Junction to Ambient)
Two-layer Board1
Four-layer Board2
θ
ja
-
-
63.5
54
-
-
°C / Watt
Thermal Resistance (Junction to Top of Package)
Two-layer Board3
Four-layer Board4
ψ
jt
-
-
0.70
0.64
-
-
°C / Watt


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