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Электронный компонент: SAA7705H

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DATA SHEET
Preliminary specification
File under Integrated Circuits, IC01
1999 Aug 16
INTEGRATED CIRCUITS
SAA7705H
Car radio Digital Signal Processor
(DSP)
1999 Aug 16
2
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
CONTENTS
1
FEATURES
1.1
Hardware
1.2
Software
2
APPLICATIONS
3
GENERAL DESCRIPTION
4
QUICK REFERENCE DATA
5
ORDERING INFORMATION
6
BLOCK DIAGRAM
7
PINNING
8
FUNCTIONAL DESCRIPTION
8.1
FM and level information processing
8.1.1
Signal path for level information
8.1.2
Signal path from FMMPX input to IAC and
stereo decoder
8.1.3
Input sensitivity for FM and RDS signals
8.1.4
AD input selection switch
8.1.5
Interference absorption circuit
8.2
Analog source selection and analog-to-digital
conversion
8.2.1
Input selection switches
8.2.2
Signal flow of the AM, analog CD and TAPE
inputs
8.2.3
The analog CD block
8.2.4
Pin VREFAD
8.2.5
Pins VDACN1, VDACN2 and VDACP
8.2.6
Supply of the analog inputs
8.3
Analog outputs
8.3.1
DACs
8.3.2
Upsample filter
8.3.3
Volume control
8.3.4
Function of pin POM
8.3.5
Power-off plop suppression
8.3.6
The internal pin VREFDA
8.3.7
Internal DAC current reference
8.3.8
Supply of the analog outputs
8.4
Clock circuit and oscillator
8.4.1
Supply of the crystal oscillator
8.4.2
The phase-locked loop circuit to generate the
DSP clock and other derived clocks
8.4.3
The clock block
8.4.4
Synchronization with the core
8.5
Equalizer accelerator circuit
8.5.1
Introduction
8.5.2
EQ circuit overview
8.5.3
Controller and programming circuit
8.6
The DSP core
8.7
External control pins and status register
8.8
I
2
C-bus interface (pins SCL and SDA)
8.9
I
2
S-bus inputs and outputs
8.10
RDS decoder (pins RDSCLK and RDSDAT)
8.10.1
Clock and data recovery
8.10.2
Timing of clock and data signals
8.10.3
Buffering of RDS data
8.10.4
Buffer interface
8.11
DSP reset
9
LIMITING VALUES
10
THERMAL CHARACTERISTICS
11
CHARACTERISTICS
12
I
2
C-BUS INTERFACE AND PROGRAMMING
12.1
I
2
C-bus interface
12.1.1
Characteristics of the I
2
C-bus
12.1.2
Bit transfer
12.1.3
Start and stop conditions
12.1.4
Data transfer
12.1.5
Acknowledge
12.2
I
2
C-bus protocol
12.2.1
Addressing
12.2.2
Slave address
12.2.3
Write cycles
12.2.4
Read cycles
12.3
Memory map specification and register
overview
12.4
Register description
12.5
Detailed register description
13
APPLICATION INFORMATION
13.1
Software description
13.2
Power supply connection and EMC
14
PACKAGE OUTLINE
15
SOLDERING
15.1
Introduction to soldering surface mount
packages
15.2
Reflow soldering
15.3
Wave soldering
15.4
Manual soldering
15.5
Suitability of surface mount IC packages for
wave and reflow soldering methods
16
DEFINITIONS
17
LIFE SUPPORT APPLICATIONS
18
PURCHASE OF PHILIPS I
2
C COMPONENTS
1999 Aug 16
3
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
1
FEATURES
1.1
Hardware
Three 3rd-order Switched Capacitor Analog-to-Digital
converters (SCADs)
Digital-to-Analog Converters (DACs) with four times
oversampling and noise shaping
Digital stereo decoder for the FM multiplex signal
Improved digital Interference Absorption Circuit (IAC) for
FM
Radio Data System (RDS) processing with an optional
16-bit buffer via a separate channel (two tuners
possible)
Auxiliary high Common-Mode Rejection Ratio (CMRR)
analog CD input (CD-walkman, speech, economic
CD-changer, etc.)
I
2
C-bus controlled
Four channel 5-band I
2
C-bus controlled parametric
equalizer
Two separate full I
2
S-bus and LSB-justified formats high
performance input interfaces
Audio output short-circuit protected
Separate AM left and right inputs
Phase-Locked Loop (PLL) to generate the high
frequency DSP clock from a common fundamental
oscillator crystal
Analog single-ended tape inputs
I
2
S-bus subwoofer output (mono or stereo)
Expandable with additional DSPs for sophisticated
features through an I
2
S-bus gateway
Operating ambient temperature from
-
40 to +85
C.
1.2
Software
Improved FM weak signal processing
Integrated 19 kHz MPX filter and de-emphasis
Electronic adjustments: FM/AM level, FM channel
separation and Dolby level
Baseband audio processing (treble, bass, balance,
fader and volume)
Dynamic loudness or bass boost
Audio level meter
Tape equalisation (tape analog playback)
Music Search System (MSS) detection for tape
Dolby-B tape noise reduction
Adjustable dynamics compressor
CD de-emphasis processing
Improved AM reception
Soft audio mute
AM IAC
Pause detection for RDS updates
Signal level, noise and multipath detection for AM/FM
signal quality information.
2
APPLICATIONS
Car radio systems.
3
GENERAL DESCRIPTION
The SAA7705H performs all the signal functions in front of
the power amplifiers and behind the AM and FM multiplex
demodulation of a car radio or the tape input.
These functions are:
Interference absorption
Stereo decoding
RDS decoding
FM and AM weak signal processing (soft mute, sliding
stereo, etc.)
Dolby-B tape noise reduction
Audio controls (volume, balance, fader and tone).
Some functions have been implemented in the hardware
(stereo decoder, RDS decoding and IAC for FM multiplex)
and are not freely programmable. Digital audio signals
from external sources with the Philips I
2
S-bus format or the
LSB-justified 16, 18 or 20 bits format are accepted.
There are four independent analog output channels.
The channels have a hardware implemented 5-band
parametric equalizer, controlled via the I
2
C-bus.
1999 Aug 16
4
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
The DSP contains a basic program that enables a set with:
AM/FM reception
Sophisticated FM weak signal functions
Music Search System (MSS) detection for tape
Dolby-B tape noise reduction system
CD play with compressor function
Separate bass and treble tone control and fader or
balance control additional to the equalizers.
4
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
V
DDD3V
digital supply voltage
3.3 V for DSP core
V
DDD3Vx
pins with respect to V
SS
3
3.3
3.6
V
I
DDD3V
supply current of the
3.3 V digital DSP core
high activity of the DSP at
27 MHz DSP frequency
-
80
110
mA
V
DDD5V
supply voltage 5 V for
periphery
V
DDDV5x
pins with respect to V
SS
4.5
5
5.5
V
I
DDD5V
supply current of the 5 V
digital periphery
-
3
5
mA
V
DDA
analog supply voltage
3.3 V
V
DDAx
pins with respect to V
SS
3
3.3
3.6
V
I
DDA
analog supply current
zero input and output signal
-
40
50
mA
Analog level inputs (AML and FML); T
amb
= 25
C; V
DDA1
= 3.3 V; unless otherwise specified
S/N
LAD
level-ADC signal-to-noise
ratio
0 to 29 kHz bandwidth;
maximum input level;
unweighted
48
54
-
dB
V
i(LAD)
input voltage level-ADC
for full-scale
0
-
V
DDA1
V
Analog inputs; T
amb
= 25
C; V
DDA1
= 3.3 V; unless otherwise specified
THD
FMMPX
total harmonic distortion
FMMPX input
input signal 0.35 V (RMS) at
1 kHz; bandwidth = 19 kHz;
note 1
-
-
70
-
65
dB
-
0.03
0.056
%
S/N
FMMPX(m)
signal-to-noise ratio
FMMPX input mono
input signal at 1 kHz;
0 dB reference = 0.35 V (RMS);
bandwidth = 19 kHz; note 1
80
83
-
dB
S/N
FMMPX(s)
signal-to-noise ratio
FMMPX input stereo
input signal at 1 kHz;
0 dB reference = 0.35 V (RMS);
bandwidth = 40 kHz; note 1
74
77
-
dB
THD
CD
total harmonic distortion
CD inputs
input signal 0.55 V (RMS) at
1 kHz; input gain = 1;
bandwidth = 20 kHz
-
-
83
-
78
dB
-
0.007
0.013
%
S/N
CD
signal-to-noise ratio CD
inputs
input signal at 1 kHz;
0 dB reference = 0.55 V (RMS);
bandwidth = 20 kHz
81
84
-
dB
THD
AM
total harmonic distortion
AM inputs
input signal 0.55 V (RMS) at
1 kHz; bandwidth = 5 kHz
-
-
80
-
76
dB
-
0.01
0.016
%
1999 Aug 16
5
Philips Semiconductors
Preliminary specification
Car radio Digital Signal Processor (DSP)
SAA7705H
Note
1. FMRDS and FMMPX input sensitivity setting `000' (see Table 17).
5
ORDERING INFORMATION
S/N
AM
signal-to-noise ratio AM
inputs
input signal at 1 kHz;
0 dB reference = 0.55 V (RMS);
bandwidth = 5 kHz
83
88
-
dB
THD
TAPE
total harmonic distortion
TAPE inputs
input signal 0.55 V (RMS) at
1 kHz; bandwidth = 20 kHz;
-
-
80
-
76
dB
-
0.01
0.016
%
S/N
TAPE
signal-to-noise ratio
TAPE inputs
input signal at 1 kHz;
0 dB reference = 0.55 V (RMS);
bandwidth = 20 kHz
81
83
-
dB
V
i(con)(max)(rms)
maximum conversion
input level at analog
inputs (RMS value)
THD < 1%
0.6
0.66
-
V
Analog outputs; T
amb
= 25
C; V
DDA2
= 3.3 V; unless otherwise specified
(THD + N)/S
total harmonic
distortion-plus-noise to
signal ratio
output signal 0.72 V (RMS) at
f = 1 kHz; R
L
> 5 k
(AC);
A-weighted
-
-
75
-
65
dBA
DR
dynamic range
output signal
-
60 dB at 1 kHz;
0 dB reference = 0.77 V (RMS);
A-weighted
92
102
-
dBA
DS
digital silence
output signal at
20 Hz to 17 kHz;
0 dB reference = 0.77 V (RMS);
A-weighted
-
-
108
-
102
dBA
Oscillator (f
osc
= 11.2896 MHz)
f
xtal
crystal frequency
-
11.2896
-
MHz
f
clk(DSP)
clock frequency
DSP core
-
27.1656
-
MHz
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
SAA7705H
QFP80
plastic quad flat package; 80 leads (lead length 1.95 mm);
body 14
20
2.8 mm
SOT318-2
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT