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UTC U2429
SERIAL DATA CONTROL DUAL
ELECTRONIC VOLUME
DESCRIPTION
The UTC U2429 is a dual channel electronic volume
controlled with 2-wire serial data.
The built-in reference circuit can compose of an
electronic volume with less external parts.
FEATURES
* Built-in reference circuit
* Control with serial data
Volume 0 ~ -83dB (1dB/step), -
(Independent control is allowed in each channel)
* Low noise and low distortion
VNO = 5µVrms (ATT = -)
THD = 0.01% Typ. (V0 = 0.5Vrms)
PIN CONFIGURATION
VIN1 1
VOUT1 2
GND 3
DATA 4
CMOS IC
SOP-8
DIP-8
8 VIN2
7 VOUT2
6 VCC
5 CLOCK
PIN DESCRIPTION
PIN No.
PIN NAME
1 VIN 1
2 VOUT1
3 GND
4 DATA
5 CLOCK
6 VCC
7 VOUT2
8 VIN2
FUNCTION
1-ch input pin
1-ch output pin
Ground pin
Control data input pin. Inputs data in synchronization with clock.
Clock input pin for transferring serial data.
Power supply pin. Stabilize the pin with decoupling capacitor.
2-ch output pin
1-ch input pin
UTC
UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R502-031,A

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UTC U2429
BLOCK DIAGRAM
VIN2
8
CMOS IC
VOUT2
7
VCC CLOCK
65
VR 2
VR 1
+
-
VOL AMP 2
VOL AMP 1
-
+
REF AMP
Vref
LOGIC
CONTROL
1
VIN1
2
VOUT1
3
GND
4
DATA
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Power Dissipation
DIP-8
SOP-8
Operating Temperature
Storage Temperature
SYMBOL
VCC, VDD
PD
Topr
Tstg
RATINGS
6.0
625
440
-20 ~ +75
-55 ~ +125
UNIT
V
mW
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
Supply voltage range
Vcc
Rated supply voltage
Vcc
RATINGS
4.5 ~ 5.5
5
UNIT
V
V
ELECTRICAL CHARACTERISTICS (VCC = 5V, Ta= 25, unless otherwise noted.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP
Circuit current
ICC
8
Maximum attenuation
ATT ATT=-
-90
Attenuation error
ATT ATT=0
-2.0 0
Maximum input voltage
VIM THD=1%, ATT=-6dB
1.5 1.7
Maximum output voltage
VOM THD=1%
0.8 1.3
Output noise voltage
VNO1 ATT=0, Rg=0
4
VNO2 ATT=-, Rg=0
5
Total harmonic distortion
THD f=1kHz, VO=0.5Vrms, ATT=0
0.01
Channel separation
CS f=1kHz
-80
MAX
16
-80
2.0
10
10
0.05
-70
UNIT
mA
dB
dB
Vrms
Vrms
μVrms
μVrms
%
dB
UTC UNISONIC TECHNOLOGIES CO., LTD. 2
QW-R502-031,A

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UTC U2429
CMOS IC
DC CHARACTERISTICS OF DIGITAL BLOCK
PARAMETER
SYMBOL
TEST CONDITIONS
"L" level input voltage
VIL Data, clock pin
"H" level input voltage
VIH
"L" level input current
IIL VI=0 Data, clock pin
"H" level input current
IIH VI=5V
AC CHARACTERISTICS OF DIGITAL BLOCK
PARAMETER
SYMBOL
TEST CONDITIONS
Cycle time of clock
tcr VDD=5V
Pulse width of clock ("H" level)
tWHC VDD=5V
Pulse width of clock ("L" level)
tWLC
VDD=5V
Clock rising time
Clock falling time
Data setup time
Data hold time
tr VDD=5V
tf VDD=5V
tSD VDD=5V
tHD VDD=5V
MIN
0
0.8VCC
-10
TYP
~
~
MAX
0.2VCC
VCC
10
10
UNIT
V
V
μA
μA
MIN TYP MAX UNIT
4 μs
1.6 μs
1.6 μs
0.4 μs
0.4 μs
0.8 μs
0.8 μs
RELATIONSHIP BETWEEN DATA AND CLOCK
CLOCK
D0 D1 D2 D3
DATA
Reads data signal at the rising edge of clock signal
D8 D9
D10
Latch signal "H"
Reads latch signal at the falling edge of clock
UTC
UNISONIC TECHNOLOGIES CO., LTD. 3
QW-R502-031,A