4 power supply characteristics, 5 thermal data (48-pin lqfp), 4 power supply characteristics 5.5 thermal data – Cirrus Logic CS48DV2B User Manual
Page 11: Confidenti a l dra ft delp hi
CS48DV2B Data Sheet
32-bit Audio DSP for Dedicated Dolby Volume and Audistry by Dolby
DS875F2
Copyright 2009 Cirrus Logic
11
CONFIDENTIAL
CONFIDENTI
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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
=
T
j
- [ (Power Dissipation in Watts) *
ψ
jt
]
Parameter
Min Typ
Max
Unit
Operational Power Supply Current:
VDD: Core and I/O operating
1
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
μ
A
μ
A
μ
A
μ
W
Parameter
Symbol
Min
Typ
Max
Unit
Junction Temperature
T
j
-
-
125
°C
Thermal Resistance (Junction to Ambient)
Two-layer Board
Four-layer Board
θ
ja
-
-
63.5
54
-
-
°C / Watt
Thermal Resistance (Junction to Top of Package)
Two-layer Board
Four-layer Board
ψ
jt
-
-
0.70
0.64
-
-
°C / Watt