ADSP-2181KST-115 Analog Devices Inc, ADSP-2181KST-115 Datasheet - Page 25

• Manufacturer Part Number: ADSP-2181KST-115
• Description: IC DSP CONTROLLER 16BIT 128TQFP
• Manufacturer: Analog Devices Inc
• Series: ADSP-21xxr
• Type: Fixed Pointr

Specifications of ADSP-2181KST-115

• Rohs Status: RoHS non-compliant
• Interface: Synchronous Serial Port (SSP)
• Clock Rate: 28.8MHz
• Non-volatile Memory: External
• On-chip Ram: 80kB
• Voltage - I/o: 5.00V
• Voltage - Core: 5.00V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 128-TQFP, 128-VQFP

OUTPUT DRIVE CURRENTS
Figure 19 shows typical I-V characteristics for the output drivers
of the ADSP-2181. The curves represent the current drive
capability of the output drivers as a function of output voltage.
POWER DISSIPATION
To determine total power dissipation in a specific application,
the following equation should be applied for each output:
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:
•
•
•
•
P
graph (Figure 20).
REV. D
INT
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
1000
NOTES:
1. REFLECTS ADSP-2181 OPERATION IN LOWEST POWER MODE.
2. CURRENT REFLECTS DEVICE OPERATING WITH NO OUTPUT LOADS.
= internal power dissipation from Power vs. Frequency
100
Figure 20. Power-Down Supply Current (Typical)
10
(SEE “SYSTEM INTERFACE" CHAPTER OF THE ADSP-2100 FAMILY
USER'S MANUAL, THIRD EDITION, FOR DETAILS.)
1
–5
Total Power Dissipation = P
5
Figure 19. Typical Drive Currents
120
100
–20
–40
–60
–80
80
60
40
20
0
15
0
25
1
TEMPERATURE –
SOURCE VOLTAGE – Volts
5.0V, +25 C
C V
35
4.5V, +85 C
2
DD
DD
45
3
2
= 5.0 V and t
INT
55
°
C
f
4
+ (C V
4.5V, +85 C
5.5V, –40 C
5.0V, +25 C
5.5V, –40 C
65
5
75
DD
CK
6
2
= 30 ns.
85
V
V
V
f )
DD
DD
DD
= 5.5V
= 5.0V
= 4.5V
–25–
(C
Address, DMS
Data Output, WR 9
RD
CLKOUT
Total power dissipation for this example is P
VALID FOR ALL TEMPERATURE GRADES.
1
2
3
4
POWER REFLECTS DEVICE OPERATING WITH NO OUTPUT LOADS.
IDLE REFERS TO ADSP-2181 STATE OF OPERATION DURING EXECUTION OF IDLE
INSTRUCTION. DEASSERTED PINS ARE DRIVEN TO EITHER V
TYPICAL POWER DISSIPATION AT 5.0V V
I
MEMORY. 50% OF THE INSTRUCTIONS ARE MULTIFUNCTION (TYPES 1, 4, 5, 12, 13, 14),
30% ARE TYPE 2 AND TYPE 6 AND 20% ARE IDLE INSTRUCTIONS.
DD
MEASUREMENT TAKEN WITH ALL INSTRUCTIONS EXECUTING FROM INTERNAL
V
DD
2
570
520
470
420
370
320
270
220
f ) is calculated for each output:
100
90
80
70
60
50
40
30
80
75
70
65
60
55
50
45
40
35
30
28
28
28
Figure 21. Power vs. Frequency
60mW
45mW
35mW
77mW
60mW
34mW
# of
Pins
8
1
1
410mW
325mW
250mW
2181 POWER, INTERNAL
30
30
30
POWER, IDLE n MODES
POWER, IDLE
32
32
32
C
V
10 pF
10 pF
10 pF
10 pF
DD
V
V
V
DD
V
V
DD
1/t
1/t
1/t
= 5.5V
DD
34
34
DD
DD
34
= 5.0V
CK
CK
CK
= 4.5V
= 5.5V
= 5.0V
= 4.5V
– MHz
– MHz
– MHz
36
36
36
DD
V
5
5
5
5
2
2
2
2
AND 25 C EXCEPT WHERE SPECIFIED.
DD
1, 2, 3
V
V
V
V
38
38
38
2
330mW
39mW
550mW
425mW
75mW
37mW
1, 3, 4
54mW
95mW
75mW
40
40
f
33.3 MHz
16.67 MHz = 37.5 mW
16.67 MHz =
33.3 MHz
40
3
ADSP-2181
INT
42
42
42
IDLE
IDLE (16)
IDLE (128)
DD
+ 116.6 mW.
OR GND.
= 66.6 mW
=
116.6 mW
4.2 mW
8.3 mW