DSP56F805 datasheet(21/56 Pages) FREESCALE

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General Characteristics

56F805 Technical Data, Rev. 16

Freescale Semiconductor

Notes:

Theta-JA determined on 2s2p test boards is frequently lower than would be observed in an application.

Determined on 2s2p thermal test board.

Junction to ambient thermal resistance, Theta-JA (RθJA) was simulated to be equivalent to the JEDEC

specification JESD51-2 in a horizontal configuration in natural convection. Theta-JA was also simulated on

a thermal test board with two internal planes (2s2p where “s” is the number of signal layers and “p” is the

number of planes) per JESD51-6 and JESD51-7. The correct name for Theta-JA for forced convection or with

the non-single layer boards is Theta-JMA.

Junction to case thermal resistance, Theta-JC (RθJC ), was simulated to be equivalent to the measured values

using the cold plate technique with the cold plate temperature used as the “case” temperature. The basic cold

plate measurement technique is described by MIL-STD 883D, Method 1012.1. This is the correct thermal

metric to use to calculate thermal performance when the package is being used with a heat sink.

Voltage difference VDD to VDDA

ΔV

-0.1

0.1

Voltage difference VSS to VSSA

ΔV

-0.1

0.1

ADC reference voltage

VREF

2.7

–

VDDA

Ambient operating temperature

–40

–

°C

Table 3-3 Thermal Characteristics6

Characteristic

Comments

Symbol

Value

Unit

Notes

144-pin LQFP

Junction to ambient

Natural convection

RθJA

47.1

°C/W

Junction to ambient (@1m/sec)

RθJMA

43.8

°C/W

Junction to ambient

Natural convection

Four layer board

(2s2p)

RθJMA

(2s2p)

40.8

°C/W

1,2

Junction to ambient (@1m/sec)

Four layer board

(2s2p)

RθJMA

39.2

°C/W

1,2

Junction to case

RθJC

11.8

°C/W

Junction to center of case

1°C/W

4, 5

I/O pin power dissipation

P I/O

User Determined

Power dissipation

P D

P D = (IDD x VDD + P I/O)W

Junction to center of case

PDMAX

(TJ - TA) /R

θJA

Table 3-2 Recommended Operating Conditions

Characteristic

Symbol

Min

Typ

Max

Unit

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