The application operates at V
參數(shù)資料
型號： ADSP-2188MBSTZ-266
廠商： Analog Devices Inc
文件頁數(shù)： 14/40頁
文件大小： 0K
描述： IC DSP CONTROLLER 16BIT 100LQFP
標準包裝： 1
系列： ADSP-21xx
類型： 定點
接口： 主機接口，串行端口
時鐘速率： 66MHz
非易失內(nèi)存： 外部
芯片上RAM： 256kB
電壓 - 輸入/輸出： 3.30V
電壓 - 核心： 2.50V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 100-LQFP
供應商設備封裝： 100-LQFP（14x14）
包裝： 托盤
REV. 0
ADSP-2188M
–21–
Each address and data pin has a 10 pF total load at the pin.
The application operates at VDDEXT = 3.3 V and tCK = 30 ns.
Total Power Dissipation = PINT + (C
× V
DDEXT
2
× f)
PINT = internal power dissipation from Power vs. Frequency
graph (Figure 15).
(C
× V
DDEXT
2
× f ) is calculated for each output:
# of
C
VDDEXT
2
fPD
Parameters
Pins
pF
V
MHz
mW
Address
7
10
3.3
2
16.67
12.7
Data Output,
WR
9
10
3.3
2
16.67
16.3
RD
1
10
3.32
16.67
1.8
CLKOUT,
DMS
2
10
3.3
2
33.3
7.2
38.0
Total power dissipation for this example is PINT + 38.0 mW.
Output Drive Currents
Figure 14 shows typical I-V characteristics for the output drivers
on the ADSP-2188M. The curves represent the current drive
capability of the output drivers as a function of output voltage.
VOH
VOL
SOURCE VOLTAGE – V
0
0.5
1.0
SOURCE
CURRENT
–
mA
60
0
–20
–40
–60
40
20
VDDEXT = 3.6V @ –40 C
VDDEXT = 3.3V @ +25 C
VDDEXT = 2.5V @ +85 C
VDDEXT = 3.3V @ +25 C
VDDEXT = 3.6V @ –40 C
80
–80
1.5
2.0
2.5
3.0
3.5
4.0
Figure 14. Typical Output Driver Characteristics
FREQUENCY DEPENDENCY FOR TIMING
SPECIFICATIONS
tCK is defined as 0.5 tCKI. The ADSP-2188M 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). tCK values
within the range of 0.5 tCKI period should be substituted for all
relevant timing parameters to obtain the specification value.
Example: tCKH = 0.5 tCK – 2 ns = 0.5 (15 ns) – 2 ns = 5.5 ns
ENVIRONMENTAL CONDITIONS
1
Rating
Description
Symbol
LQFP
Mini-BGA
Thermal Resistance
θCA
48
°C/W
63.3
°C/W
(Case-to-Ambient)
Thermal Resistance
θJA
50
°C/W
70.7
°C/W
(Junction-to-Ambient)
Thermal Resistance
θ
JC
2
°C/W
7.4
°C/W
(Junction-to-Case)
NOTE
1Where the Ambient Temperature Rating (T
AMB) is:
TAMB = TCASE – (PD
× θ
CA)
TCASE = 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
DD 2 × f
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:
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.
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