ADSP-2187NKST-320 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADSP-2187NKST-320 Datasheet PDF : 45 Pages
| |||
ADSP-218xN Series
ESD SENSITIVITY
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V
readily accumulate on the human body and test equipment and can discharge without
detection. Although the ADSP-218xN features proprietary ESD protection circuitry,
permanent damage may occur on devices subjected to high-energy electrostatic
discharges. Therefore, proper ESD precautions are recommended to avoid perfor-
mance degradation or loss of functionality.
Power Dissipation
To determine total power dissipation in a specific applica-
tion, the following equation should be applied for each
output: C ؋ VDD2 ؋ f
where: 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.
• Each address and data pin has a 10 pF total load at the pin.
• Application operates at VDDEXT = 3.3 V and tCK = 30 ns.
Total Power Dissipation = PINT + (C ؋VDDEXT2 ؋ f)
P INT = internal power dissipation from Figure 20 on
page 26.
(C ؋ VDDEXT2 ؋ f) is calculated for each output, as in the
example in Table 13.
Table 13. Example Power Dissipation Calculation
Parameters
Address
Data Output, WR
RD
CLKOUT, DMS
# of Pins
7
9
1
2
× C (pF)
10
10
10
10
× VDDEXT2 (V)
3.32
3.32
3.32
3.32
× f (MHz)
20.0
20.0
20.0
40.0
PD (mW)
15.25
19.59
2.18
8.70
45.72
Total power dissipation for this example is
PINT + 45.72 mW.
REV. 0
–23–
|
|
Share Link: 