ADSP21486KSWZ3ABRL datasheet(56/71 Pages) AD

56 / 71 page

Rev. H

Page 56 of 71

February 2020

ADSP-21483/ADSP-21486/ADSP-21487/ADSP-21488/ADSP-21489

THERMAL CHARACTERISTICS

The ADSP-2148x processor is rated for performance over the

temperature range specified in Operating Conditions on

Page 18.

The JESD51 package thermal characteristics in this section are

provided for package comparison and estimation purposes only.

They are not intended for accurate system temperature calcula-

tion. System thermal simulation is required for accurate

temperature analysis that accounts for all specific 3D system

design features, including, but not limited to other heat sources,

use of heat-sinks, and the system enclosure. Contact Analog

Devices for package thermal models that are intended for use

with thermal simulation tools.

In Table 55, Table 56, and Table 57, airflow measurements com-

ply with JEDEC standards JESD51-2 and JESD51-6, and the

junction-to-board measurement complies with JESD51-8. Test

board design complies with JEDEC standards JESD51-7 (LQF-

P_EP). The junction-to-case measurement complies with MIL-

STD-883. All measurements use a 2S2P JEDEC test board.

To estimate the junction temperature of a single device while on

a JEDEC 2S2P PCB, use:

where:

TJ = junction temperature °C

TCASE = case temperature (°C) measured at the top center of the

package



JT = junction-to-top (of package) characterization parameter

is the typical value from Table 55, Table 56, and Table 57.

PD = power dissipation

Values of JA are provided for package comparison and PCB

design considerations. JA can be used for a first-order approxi-

mation of TJ by the equation:

where:

TA = ambient temperature °C

Figure 44. Typical Output Rise/Fall Time (20% to 80%, VDD_EXT = Min)

Figure 45. Typical Output Rise/Fall Delay (VDD_EXT = Max)

Figure 46. Typical Output Rise/Fall Delay (VDD_EXT = Min)

LOAD CAPACITANCE (pF)

200

150

100

125

175

y = 0.0571x + 0.5558

y = 0.0278x + 0.3138

y = 0.0258x + 0.3684

TYPE A DRIVE FALL

TYPE A DRIVE RISE

TYPE B DRIVE RISE

TYPE B DRIVE FALL

y = 0.0747x + 0.5154

LOAD CAPACITANCE (pF)

3.5

0.5

1.5

2.5

y = 0.0152x + 1.7607

y = 0.0068x + 1.7614

y = 0.0196x + 1.2945

y = 0.0074x + 1.421

200

150

100

125

175

TYPE A DRIVE FALL

TYPE A DRIVE RISE

TYPE B DRIVE RISE

TYPE B DRIVE FALL

4.5

LOAD CAPACITANCE (pF)

125

200

100

175

150

y = 0.0256x + 3.5859

y = 0.0116x + 3.5697

y = 0.0359x + 2.924

y = 0.0136x + 3.1135

TYPE A DRIVE FALL

TYPE A DRIVE RISE

TYPE B DRIVE FALL

TYPE B DRIVE RISE

CASE













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