ROHM BU9480F Datasheet
1
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.
•
Applications
16-bit stereo D / A converter for audio applications
•
Features
1) 3.0 to 5.5V operating voltage.
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
BCLK
SDATA
OUTL
REF
OUTR
GND
V
CC
1
2
3
4
5
6
7
8
SHIFT REGISTER / LATCH
X2 OVER
SAMPLING
DAC
X2 OVER
SAMPLING
DAC
•
Pin descriptions
Pin name Function I / O Voltage
1R
OUT 1 / 2VCC
1 / 2VCC
—
1 / 2V
CC
—
—
—
—
Right channel analog signal output
2 REF
3 GND
4L
OUT
Left channel analog signal output
5
LRCK
6
7
SDAT
BCLK
VCC
8
Serial data shift clock input
Vcc
Connects the DA ref. voltage pin and ground
Ground
Pin No.
Low-impedance output
High-impedance input
—
Low-impedance output
Logic input
Logic input
Logic input
—
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.
2
Multimedia ICs BU9480F
•
Electrical characteristics (unless otherwise noted, Ta = 25°C, VDD = + 5.0V)
Parameter Symbol Min. Typ. Max. Unit Conditions Measurement circuit
Current dissipation I
DD
— 3.6 6 mA f = 1kHz, 0dB Fig.6,7
Resolution RES ——
—
—16 BIT Fig.6,7
Noise distortion 1 THD1 — 0.05 0.12 % f = 1kHz, 0dB Fig.6,7
Noise distortion 2 THD2 — 0.07 0.4 % f = 1kHz, – 20dB Fig.6,7
Full-scale output voltage V
FS
1.8 2 2.2 V
P-P
Fig.6,7
Crosstalk
– 92 – 85 dB
Unmeasured channel output =
0 dB, f = 1kHz. DIN audio filter
Fig.6,7
C.T —
S / N ratio S / NRL86 93 — dB DIN audio filter Fig.6,7
Output pin load resistance 10 —— —kΩ Fig.6,7
Parameter Symbol Min. Typ. Max. Unit Conditions Measurement circuit
Input high level voltage V
IH
0.7 × VDD— V
DD
V Pins 5,6 and 7
Pins 5,6 and 7
Fig.6,7
Input low level voltage V
IL
— 0.3
×
V
DD
VGND Fig.6,7
Leakage current, high level I
IH
— — – 10 µA Pins 5,6 and 7 = V
DD
Fig.6,7
Leakage current, low level I
IL
——10 µA Pins 5,6 and 7 = GND Fig.6,7
f
SL
——200 kH
Z
Fig.6,7
—— ns
ns
Fig.6,7T
BCLK
T
ST
Fig.6,7
SDAT.LRCK holding time T
HD
60
60
60
—
—
—
—
—
—
—
—
ns Fig.6,7
DA conversion frequency
BCLK period
SDAT.LRCK settling time
Analog unit characteristics
Logic input characteristics
•
Absolute maximum ratings (Ta = 25°C)
•
Recommended operating conditions
Parameter Symbol Limits Unit
7.0 V
Pd
450
∗
mW
Topr – 10 ~ + 70
Tstg – 55 ~ + 125 °C
Topt – 0.3 ~ V
DD + 0.3 V
V
DDMax.
°C
∗
When unmounted, reduced by 4.5mW for each increase in Ta of 1°C over 25°C.
Applied voltage
Power dissipation
Operating temperature
Storage temperature
Input voltage
Parameter Symbol Limits Unit
Power supply voltage 3.0 ~ 5.5 V
Input low level voltage
Input high level voltage
V
IL
0.0 ~ 0.2 × VDD
V
V
IH
0.8 × VDD ~ VDD
VDD
V
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