Multimedia ICs
16-bit stereo D / A converter
for audio applications
BU9480F
The BU9480F is a 16-bit stereo D / A converter designed for audio applications, and has an internal 2
×
oversam-
pling circuit.
•
ApplicationsD / A converter for audio applications
16-bit stereo
•
Features operating voltage.
1) 3.0 to 5.5V
2) Low current consumption because of the CMOS
process.
3) Resistor strings method used.
4) 2-channel common phase output.
5) Internal 2
×
oversampling interpolator.
6) 8 - pin plastic package.
7) Supports 4fs. (200kHz operation)
•
Block diagram
LRCLK 5
BCLK
7
X2 OVER
SAMPLING
SDATA 6
DAC
DAC
SHIFT REGISTER / LATCH
8
X2 OVER
SAMPLING
V
CC
3 GND
4
OUTL
2
REF
1
OUTR
•
Pin descriptions
Pin No.
1
2
3
4
5
Pin name
R
OUT
REF
GND
L
OUT
LRCK
Function
Right channel analog signal output
Connects the DA ref. voltage pin and ground
Ground
Left channel analog signal output
The signal that distinguishes between left and
right channels for serial data (left channe =
high level, right channel = low level).
Serial data input
Input with 2' compliment, MSB first.
Serial data shift clock input
Vcc
I/O
Low-impedance output
High-impedance input
—
Low-impedance output
Logic input
Voltage
1 / 2V
CC
1 / 2V
CC
—
1 / 2V
CC
—
6
7
8
SDAT
BCLK
V
CC
Logic input
Logic input
—
—
—
—
1
Multimedia ICs
BU9480F
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Applied voltage
Power dissipation
Operating temperature
Storage temperature
Input voltage
Symbol
V
DDMax.
Pd
Topr
Tstg
Topt
Limits
7.0
450
∗
– 10 ~ + 70
– 55 ~ + 125
– 0.3 ~ V
DD
+ 0.3
Unit
V
mW
°C
°C
V
∗
When unmounted, reduced by 4.5mW for each increase in Ta of 1°C over 25°C.
•
Recommended operating conditions
Parameter
Power supply voltage
Input low level voltage
Input high level voltage
Symbol
V
DD
V
IL
V
IH
Limits
3.0 ~ 5.5
0.0 ~ 0.2
×
V
DD
0.8
×
V
DD
~ V
DD
Unit
V
V
V
characteristics
•
Electrical
characteristics
(unless otherwise noted, Ta = 25°C, V
Analog unit
Parameter
Current dissipation
Resolution
Noise distortion 1
Noise distortion 2
Full-scale output voltage
Crosstalk
S / N ratio
Output pin load resistance
Symbol
I
DD
RES
THD1
THD2
V
FS
C.T
S/N
RL
Min.
—
—
—
—
1.8
—
86
10
Typ.
3.6
—
0.05
0.07
2
– 92
93
—
Max.
6
16
0.12
0.4
2.2
– 85
—
—
Unit
mA
BIT
%
%
V
P-P
dB
dB
kΩ
DD
= + 5.0V)
Conditions
f = 1kHz, 0dB
—
f = 1kHz, 0dB
f = 1kHz, – 20dB
—
Unmeasured channel output =
0 dB, f = 1kHz. DIN audio filter
DIN audio filter
—
Measurement circuit
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Logic input characteristics
Parameter
Input high level voltage
Input low level voltage
Leakage current, high level
Leakage current, low level
DA conversion frequency
BCLK period
SDAT.LRCK settling time
SDAT.LRCK holding time
Symbol
V
IH
V
IL
I
IH
I
IL
f
SL
T
BCLK
T
ST
T
HD
Min.
0.7
×
V
DD
GND
—
—
—
60
60
60
Typ.
—
—
—
—
—
—
—
—
Max.
V
DD
0.3
×
V
DD
– 10
10
200
—
—
—
Unit
V
V
µA
µA
kH
Z
ns
ns
ns
Conditions
Pins 5,6 and 7
Pins 5,6 and 7
Pins 5,6 and 7 = V
DD
Pins 5,6 and 7 = GND
—
—
—
—
Measurement circuit
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
Fig.6,7
2
Multimedia ICs
BU9480F
•
Pin equivalent circuits
+
–
1, 4 pin
3 pin
Fig.1
Fig.4
2 pin
Fig.2
Fig.5
8 pin
5, 6, 7 pin
Fig.3
•
Measurement circuits
V
CC
A
8
7
BU9480F
1
2
3
4
10kΩ
10µF
THD
+
V
+
1µF
DIGITAL
AUDIO
DATA
6
5
10kΩ
THD
V
+
1µF
Fig. 6
A
V
Fig. 7
3
•
I / O signal timing chart
4
LSB
MSB
BCLK
LSB
N
LSB
MSB
Multimedia ICs
SDAT
12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16
N–1
N
LRCK
L ch
R ch
(D (N – 1) + D (N) ) / 2
L OUT
D (N – 1)
D (N – 2)
Interpolation data (D (N – 2) + D (N – 1) ) / 2
(D (N – 1) + D (N) ) / 2
R OUT
D (N – 2)
Interpolation data (D (N – 2) + D (N – 1) ) / 2
D (N – 1)
Note:
Interpolation and original data output are timed respectively to the leading edge and leading edge of LRCK,
and so LRCK should be set to a duty of 50%.
Fig. 8
T
BCLK
V
IH
V
IH
V
IL
T
BCLK
T
HD
T
ST
SDATA
V
IH
V
IH
V
IL
V
IL
T
ST
T
HD
BLCK
V
IH
V
IL
T
HD
T
ST
LRCK
V
IH
V
IL
V
IH
V
IL
BU9480F
Multimedia ICs
BU9480F
•
External dimensions (Units: mm)
5.0
±
0.2
8
6.2
±
0.3
4.4
±
0.2
5
1.5
±
0.1
1
4
0.11
1.27
0.4
±
0.1
0.3Min.
0.15
SOP8
0.15
±
0.1
5
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