參數(shù)資料
型號(hào)： SST-MELODY-DAP
英文描述： SST-Melody&#174:-DAP: Audio Processor Data Sheet (Rev. 0. 10/02)
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 585K
代理商： SST-MELODY-DAP
REV. 0
–8–
SST-Melody-DAP
Assumptions:
External data memory is accessed every cycle with 50% of the
address pins switching.
External data memory writes occur every other cycle with
50% of the data pins switching.
Each address and data pin has a 10 pF total load at the pin.
The application operates at V
DDEXT
= 3.3 V and
t
CK
= 30 ns.
Total Power Dissipation
=
P
INT
+ (
C
V
DDEXT
2
f
)
P
INT
= internal power dissipation from Power vs. Frequency
graph (see Figures 2a through 2c).
(
C
V
DDEXT2
f
) is calculated for each output:
Table III. Power Dissipation Example
No. of
Pins
C
(pF) (V)
V
DDEXT2
f
(MHz)
(mW)
PD
Parameter
Address
Data Output,
WR
RD
CLKOUT,
DMS
Total
7
9
1
2
10
10
10
10
3.3
2
3.3
2
3.3
2
3.3
2
16.67
16.67
16.67
33.3
12.7
16.6
1.8
7.2
38.2
Total power dissipation for this example is P
INT
+ 38.0 mW.
Output Drive Currents
Figure 1 shows typical I–V characteristics for the output
drivers
on the SST-Melody-DAP. The curves represent the
current drive
capability of the output drivers as a function of
output voltage.
SOURCE VOLTAGE – V
–80
0
S
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
–60
–40
–20
0
20
40
60
80
V
DDEXT
– 3.6V @ –40 C
V
DDEXT
– 3.3V @ +25 C
V
DDEXT
– 2.5V @ +85 C
V
OH
V
OL
V
DDEXT
– 3.6V @ –40 C
V
DDEXT
– 2.5V @ +85 C
V
DDEXT
– 3.3V @ +25 C
Figure 1. Typical Output Driver Characteristics
Table I. Memory Timing Specifications
Memory
Device
Specification
Timing
Parameter
Definition
*
Parameter
Address Setup to
Write Start
Address Setup to
Write End
Address Hold
Time
Data Setup Time
Data Hold Time
OE to Data Valid
Address Access
Time
t
ASW
A0–A13,
xMS
Setup
before
WR
Low
A0–A13,
xMS
Setup
before
WR
Deasserted
A0–A13,
xMS
Hold
before
WR
Low
Data Setup before
WR
High
Data Hold after
WR
High
RD
Low to Data Valid
A0–A13,
xMS
to
Data Valid
t
AW
t
WRA
t
DW
t
DH
t
RDD
t
AA
*
xMS
=
PMS
,
DMS
,
CMS
, or
IOMS
.
FREQUENCY DEPENDENCY FOR TIMING
SPECIFICATIONS
t
CK
is defined as 0.5 t
CKI
. The SST-Melody-DAP uses an input
clock with a frequency equal to half the instruction rate. For
example, a 37.50 MHz input clock (which is equivalent to 26.6 ns)
yields a 13.3 ns processor cycle (equivalent to 75 MHz). t
CK
values within the range of 0.5 t
CKI
period should be substituted
for all relevant timing parameters to obtain the specification value.
Example: t
CKH
= 0.5 t
CK
– 2 ns = 0.5 (15 ns) – 2 ns = 5.5 ns
Table II. Environmental Conditions
*
Rating
Description
Symbol
LQFP
48
°
C/W
Mini-BGA
63.3
°
C/W
Thermal Resistance
(Case-to-Ambient)
Thermal Resistance
(Junction-to-Ambient)
Thermal Resistance
(Junction-to-Case)
CA
JA
50
°
C/W
70.7
°
C/W
JC
2
°
C/W
7.4
°
C/W
*
Where the Ambient Temperature Rating (T
AMB
) is:
T
AMB
= T
CASE
– (PD
CA
)
T
CASE
= Case Temperature in
°
C
PD = Power Dissipation in W
POWER DISSIPATION
To determine total power dissipation in a specific application,
the following equation should be applied for each output:
C V
f
DD
×
2
C
= load capacitance,
f
= output switching frequency.
Example:
In an application where external data memory is used and no
other outputs are active, power dissipation is calculated as follows:
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