ADSP-2115BPZ-100 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'ADSP-2115BPZ-100' PDF : 64 Pages View PDF
ADSP-21xx
SPECIFICATIONS (ADSP-2111)
POWER DISSIPATION EXAMPLE
To determine total power dissipation in a specific application,
the following equation should be applied for each output:
C × VDD2 × f
C = load capacitance, f = output switching frequency.
Example:
In an ADSP-2111 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.
• The application operates at VDD = 5.0 V and tCK = 50 ns.
Total Power Dissipation = PINT + (C × VDD2 × f )
PINT = internal power dissipation (from Figure 17).
(C × VDD2 × f ) is calculated for each output:
CAPACITIVE LOADING
Figures 18 and 19 show capacitive loading characteristics for the
ADSP-2111.
14
VDD = 4.5V
12
10
8
6
4
2
25 50 75 100 125 150
CL – pF
Figure 18. Typical Output Rise Time vs. Load Capacitance, CL
(at Maximum Ambient Operating Temperature)
Output
# of
Pins × C
× VDD2 × f
Address, DMS 8
Data, WR
9
RD
1
CLKOUT 1
× 10 pF
× 10 pF
× 10 pF
× 10 pF
× 52 V
× 52 V
× 52 V
× 52 V
× 20 MHz = 40.0 mW
× 10 MHz = 22.5 mW
× 10 MHz = 2.5 mW
× 20 MHz = 5.0 mW
70.0 mW
Total power dissipation for this example = PINT + 70.0 mW.
ENVIRONMENTAL CONDITIONS
Ambient Temperature Rating:
TAMB = TCASE – (PD × θCA)
TCASE = Case Temperature in °C
PD = Power Dissipation in W
θCA = Thermal Resistance (Case-to-Ambient)
θJA = Thermal Resistance (Junction-to-Ambient)
θJC = Thermal Resistance (Junction-to-Case)
+12
+10
+8
+6
+4
+2
NOMINAL
–2
–4
–6
VDD = 4.5V
25 50 75 100 125 150
CL – pF
Figure 19. Typical Output Valid Delay or Hold vs. Load
Capacitance, CL (at Maximum Ambient Operating Temperature)
Package
PGA
PQFP
θJA
35°C/W
42°C/W
θJC
18°C/W
18°C/W
θCA
17°C/W
23°C/W
REV. B
–23–
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