ADSP-21486KSWZ-2AB datasheet(56/68 Pages) AD

56 / 68 page

Rev. B

Page 56 of 68

March 2013

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.

Table 57 airflow measurements comply with JEDEC standards

JESD51-2 and JESD51-6, and the junction-to-board measure-

ment complies with JESD51-8. Test board design complies with

JEDEC standards JESD51-7 (LQFP_EP). The junction-to-case

measurement complies with MIL- STD-883. All measurements

use a 2S2P JEDEC test board.

To determine the junction temperature of the device while on

the application 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 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

Values of JC are provided for package comparison and PCB

design considerations when an external heatsink is required.

Figure 45. Typical Output Rise/Fall Time

(20% to 80%, VDD_EXT = Min)

Figure 46. Typical Output Rise/Fall Delay

(VDD_EXT = Max)

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

Figure 47. Typical Output Rise/Fall Delay

(VDD_EXT = Min)

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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