SAA7715 Datasheet, PDF (4/36 Pages) NXP Semiconductors – Digital Signal Processor

Philips Semiconductors
Digital Signal Processor
Preliminary specification
SAA7715H
3 GENERAL DESCRIPTION
The SAA7715 is a cost effective and powerful high
performance 24-bit programmable DSP for a variety of
digital audio applications. This DSP device integrates a
24-bit DSP core with programmable memories (program
RAM/ROM, data and coefficient RAM), 4 digital serial
inputs, 4 digital serial outputs, 2 separate SPDIF
receivers, a stereo FSDAC, a standard Philips I²C-bus
interface, a phase-locked loop for the DSP clock
generation and a second phase-locked loop for system
clock generation (internal and external DAC clocks).
The SAA7715 can be configured for various audio
applications by downloading the dedicated DSP program
code into the DSP program RAM or using the ROM or a
combination of both. During the ‘Power-down mode’ the
contents of the memories and all other settings will keep
their values. The SAA7715 can be initialized using the
I²C-bus interface.
Several system application examples, based on this
existing SAA7715, are available for a wide range of audio
applications (e.g car radio DSP, DVD post-processing,
Dolby Pro Logic, PC/USB audio and more) which can be
used as a reference design for customers.
4 QUICK REFERENCE DATA
SYMBOL
V_DD
I_DDD
I_DDA
P_tot
I_POWERDOWN
f_s
(THD + N)/S_DAC
S/N_DAC
CLK_IN
DSPFREQ
PARAMETER
CONDITIONS
MIN.
operating supply voltage
all pins V_DD with respect to 3.15
pins V_SS
supply current of the digital high activity of the DSP at −
part
DSPFREQ frequency
supply current of the
analog part
zero input and output
−
signal
total power dissipation
high activity of the DSP at −
DSPFREQ frequency
DC supply current of the pin POWERDOWN
−
total chip in Power-down enabled
mode
sample frequency
at IIS_WS1, SPDIF1 or 32
SPDIF2 input
total harmonic
at 0 dB
−
distortion-plus-noise to
at −60 dB
−
signal ratio of DAC
signal-to-noise ratio of
code = 0
−
DAC
clock input
DIV_CLK_IN = LOW
8.192
DIV_CLK_IN = HIGH
16.384
maximum DSP clock
−
TYP. MAX.
3.3
3.45
95
−
20
−
380
−
400
−
44.1 96
−85
−
−37
−
100
−
11.2896 12.288
−
24.576
−
70
UNIT
V
mA
mA
mW
µA
kHz
dB(A)
dB(A)
dB(A)
MHz
MHz
MHz
5 ORDERING INFORMATION
TYPE NUMBER
SAA7715H
NAME
QFP44
PACKAGE
DESCRIPTION
plastic quad flat package; 44 leads (lead length 1.3 mm);
body 10 × 10 × 1.75 mm
VERSION
SOT307-2
2001 May 07
4