Philips Semiconductors
Digital Audio Processing IC (DAPIC)
Product specification
SAA7740H
FEATURES
Hardware
• Two digital inputs and two digital outputs in the I2S-bus
format (i.e. 4 audio channels)
• Independent input/output interfaces
• Slave input/output interfaces
• Slave processing
• I2C-bus microcontroller interface
• DC filtering at the inputs
• One programmable 2nd-order digital filter unit
• Two multiply accumulate processor units
(24 × 16-bit/MAC)
• DRAM interface and address computation unit for
external delay lines
• On-chip coefficient and external delay line address
storage
• Hardware controlled soft mute via the MUTE pin
• Hardware controlled soft demute via the RST pin
• Operating ambient temperature; −40 to +85 °C.
Software
• 5-band parametric equalizer with selectable centre
frequency, slope setting and boost/cut gain settings
from −12 to +12 dB
• Stereo width control from mono to stereo to spatial
stereo
• Stereo Hall-effects for field acoustics, such as concert
halls, with 8 coefficients and 8 delayed taps per channel
• External delay line processing for delays up to 1 second
• Reverberation with selectable reverberation time (up to
5 seconds) and energy
• Three different surround sound programs to obtain a
spatial effect on 4 loudspeakers
• Passive DOLBY surround processing with the addition
of an external dynamic noise reduction IC
• Karaoke processing
• Dual 16th-order correction filtering
• Quad 8th-order correction filtering
• Digital volume and balance control
• Soft controlled soft mute/demute via the microcontroller
interface
• Input switching matrix
• Output rear and front switching matrix.
APPLICATIONS
• Digital amplifiers
• Audio combination sets
• Car audio systems
• TV audio channels.
QUICK REFERENCE DATA
SYMBOL
VDD(tot)
IDD(tot)
fxtal
Ptot
Tamb
PARAMETER
CONDITIONS
total DC supply voltage
total DC supply current
input crystal frequency
all VDD pins
fxtal = 16.9344 MHz
total power dissipation
fxtal = 16.9344 MHz
operating ambient temperature
MIN.
4.5
−
12.288
−
−40
TYP. MAX.
5.0
5.5
60
−
16.9344 23.0
0.3
−
−
+85
UNIT
V
mA
MHz
W
°C
ORDERING INFORMATION
TYPE
NUMBER
SAA7740H
NAME
QFP64
PACKAGE
DESCRIPTION
plastic quad flat package; 64 leads (lead length 1.95 mm); body
14 × 20 × 2.8 mm
VERSION
SOT319-2
1997 May 30
2