SAA2521 datasheet(8/28 Pages) PHILIPS

Part #	SAA2521

Description	Masking threshold processor for MPEG layer 1 audio compression applications

PDF	28 Pages

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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8 / 28 page

August 1993

Philips Semiconductors

Preliminary speciﬁcation

Masking threshold processor for MPEG

layer 1 audio compression applications

SAA2521

Power-down Mode Switching

When the potential on the RESET pin (pin 23) is held HIGH

for at least 5TCLK24 clock periods, the device will be reset

after which it will operate in its decoding mode.

The power-down mode is activated when the PWRDWN

pin (pin 30) is held HIGH. The 3-state buffers will be set to

a high impedance while the normal outputs will retain the

state attained prior to this mode being entered. This mode

can only be used if other associated circuits react

accordingly. The power-down mode is de-activated by a

reset action.

Fig.5 shows the operation for the power-down mode

switching.

Table 1

Resolution selection.

RESOL1

RESOL0

RESOLUTION

16-bits

18-bits

14-bits

15-bits

Fig.5 Power-down mode switching.

TrH > 5TCLK24 = 210 ns (for CLK24 = 24.576 MHz) minimum time RESET HIGH

MEA659 - 1

sleep mode active

PWRDWN

RESET

t rH

SAA2521 Datasheet(PDF) 8 Page - NXP Semiconductors