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CS495313-DQZ Fiches technique(PDF) 11 Page - Cirrus Logic

No de pièce CS495313-DQZ
Description  32-bit Audio Decoder DSP Family with Dual DSP Engine Technology
Download  38 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS4953xx Data Sheet
32-bit Audio Decoder DSP Family
DS705PP2
®Copyright 2008 Cirrus Logic, Inc.
11
5.4 Power Supply Characteristics
(measurements performed under operating conditions)
5.5 Thermal Data (144 LQFP)
5.6 Thermal Data (128 LQFP)
Notes: 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 and ground plane layers.
3.
To calculate the die temperature for a given power dissipation
4.
Τ
j = Ambient Temperature + [ (Power Dissipation in Watts) *
θ
ja ]
5.
To calculate the case temperature for a given power dissipation
6.
Τ
c =
Τ
j - [ (Power Dissipation in Watts) * ψ jt ]
5.7 Switching Characteristics— RESET
Parameter
Min
Typ
Max
Unit
Power supply current:
Core and I/O operating: VDD1
PLL operating: VDDA
With external memory and most ports operating: VDDIO
1. Dependent on application firmware and DSP clock speed.
-
-
-
500
3.5
120
-
-
-
mA
mA
mA
Parameter
Symbol
Min
Typ
Max
Unit
Thermal Resistance (Junction to Ambient)
Two-layer Board1
Four-layer Board2
θ
ja
-
-
48
40
-
-
°C / Watt
Thermal Resistance (Junction to Top of Package)
Two-layer Board1
Four-layer Board2
ψ
jt
-
-
.39
.33
-
-
°C / Watt
Parameter
Symbol
Min
Typ
Max
Unit
Thermal Resistance (Junction to Ambient)
Two-layer Board1
Four-layer Board2
θ
ja
-
-
53
44
-
-
°C / Watt
Thermal Resistance (Junction to Top of Package)
Two-layer Board1
Four-layer Board2
ψ
jt
-
-
.45
.39
-
-
°C / Watt
Parameter
Symbol
Min
Max
Unit
RESET# minimum pulse width low
Trstl
1-
μs
All bidirectional pins high-Z after RESET# low
Trst2z
-100
ns
Configuration pins setup before RESET# high
Trstsu
50
-
ns
Configuration pins hold after RESET# high
Trsthld
20
-
ns


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