Philips Semiconductors
Preliminary specification
Audio CODEC
1
FEATURES
UDA1342TS
General
•
2.7 to 3.6 V power supply
•
5 V tolerant digital inputs
•
High pin compatibility with UDA1341TS
•
24 bits data path
•
Selectable control via L3-bus interface, I
2
C-bus
interface or static pin control; choice of 2 device
addresses in L3-bus and I
2
C-bus mode
•
Supports sample frequencies from 16 to 110 kHz
•
Separate power control for ADC and DAC
•
ADC and Programmable Gain Amplifiers (PGA) plus
integrated high-pass filter to cancel DC offset
•
Integrated digital filter plus DAC
•
Digital silence detection
•
No analog post filtering required for DAC
•
Slave mode only applications
•
Easy application.
Multiple format data interface
•
I
2
S-bus, MSB-justified and LSB-justified format
compatible
•
1f
s
to 4f
s
input and 1f
s
output format data rate.
DAC digital sound processing
•
Separate digital logarithmic volume control for left and
right channels in L3-bus mode or I
2
C-bus mode
•
Digital tone control, bass boost and treble in L3-bus
mode or I
2
C-bus mode
•
Digital de-emphasis for sample frequencies of
32, 44.1, 48 and 96 kHz in L3-bus mode or I
2
C-bus
mode
•
Soft or quick mute in L3-bus mode or I
2
C-bus mode
•
Output signal polarity control in L3-bus mode or I
2
C-bus
mode
•
Digital mixer for ADC output signal and digital serial
input signal.
Advanced audio configuration
•
4 channel (2
×
stereo) single-ended inputs with
programmable gain amplifiers and 2 channel
(1
×
stereo) single-ended outputs configuration
•
Output signal polarity control in L3-bus mode or I
2
C-bus
mode
•
High linearity, wide dynamic range, low distortion
•
Double differential input configuration for enhanced
ADC sound quality.
2
APPLICATIONS
•
Eminently suitable for MiniDisc (MD) home and portable
applications.
3
GENERAL DESCRIPTION
The UDA1342TS is a single-chip 4 channel
analog-to-digital converter and 2 channel digital-to-analog
converter with signal processing features employing
bitstream conversion techniques. The low power
consumption and low voltage requirements make the
device eminently suitable for use in low-voltage low-power
portable digital audio equipment which incorporates
recording and playback functions.
The UDA1342TS supports the I
2
S-bus data format with
word lengths of up to 24 bits, the MSB-justified data format
with word lengths of up to 24 bits and the LSB-justified
serial data format with word lengths of 16, 20 and 24 bits.
The device also supports a combination of the
MSB-justified output format and the LSB-justified input
format.
The UDA1342TS has special sound processing features in
the playback mode such as de-emphasis, volume, mute,
bass boost and treble, which can be controlled by the
microcontroller via the L3-bus or I
2
C-bus interface.
2000 Mar 29
3
Philips Semiconductors
Preliminary specification
Audio CODEC
4
QUICK REFERENCE DATA
SYMBOL
Supplies
V
DDA(ADC)
V
DDA(DAC)
V
DDD
I
DDA(ADC)
ADC analog supply voltage
DAC analog supply voltage
digital supply voltage
ADC analog supply current
1 ADC + 1 PGA enabled
2 ADCs + 2 PGAs enabled
all ADCs + all PGAs
power-down
I
DDA(DAC)
I
DDD
DAC analog supply current
digital supply current
operating
DAC power-down
operating
ADC power-down
DAC power-down
T
amb
V
i(rms)
(THD+N)/S
48
ambient temperature
Analog-to-digital convertor
input voltage (RMS value)
at 0 dB (FS) digital output
−
−
−
−
−
−
−
−
−
−
−
0.9
2.7
2.7
2.7
−
−
−
−
−
−
−
−
−40
PARAMETER
CONDITIONS
MIN.
UDA1342TS
TYP.
MAX.
UNIT
3.0
3.0
3.0
10.0
20.0
200
6.0
250
9.0
4.5
5.5
−
3.6
3.6
3.6
−
−
−
−
−
−
−
−
+85
−
−
−
−
−
−
−
−
−
−
−
V
V
V
mA
mA
µA
mA
µA
mA
mA
mA
°C
V
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
total harmonic distortion-plus-noise normal mode
to signal ratio at f
s
= 48 kHz
at
−1
dB
at
−60
dB; A-weighted
double differential
at
−1
dB
at
−60
dB; A-weighted
−90
−40
−93
−41
−84
−40
100
101
99
100
(THD+N)/S
96
total harmonic distortion-plus-noise normal mode
to signal ratio at f
s
= 96 kHz
at
−1
dB
at
−60
dB; A-weighted
signal-to-noise ratio at f
s
= 48 kHz
normal mode;
V
i
= 0 V; A-weighted
double differential mode;
V
i
= 0 V; A-weighted
S/N
48
S/N
96
α
cs
signal-to-noise ratio at f
s
= 96 kHz
channel separation
normal mode;
V
i
= 0 V; A-weighted
2000 Mar 29
4
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