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UTC LAG668 LINEAR INTEGRATED CIRCUIT
RADIO AND CASSETTE RECORDER
CIRCUIT
DESCRIPTION
The UTC LAG668 is a monolithic integrated circuit,
designed for portable radio cassette.
FEATURES
*1-Chip IC for headphone stereo
SOP-28
BLOCK DIAGRAM
25 24 23 22 21 19 20 18 14 17 16 15 13
2627
Power Amp
Motor
1/2 Vcc
Power
Amp
8283 4 5
9 11 10 12
Control
Power Amp
1/2 Vcc
1 2
Pre Amp
Bias
Control
Pre Amp
Attenuator
V/I
Attenuator
6 7
UTC UNISONIC TECHNOLOGIES CO., LTD.
QW-R110-012,A
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UTC LAG668 LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
V
BPRE
1IN+
1IN-
INF
PRF
PRE
IOUT
ATT1
CON
VOL
V
REF
1OUT
P
GND
P
V
BP
GND
MD
V
CON
MO
ON
PIN NO. SYMBOL DESCRIPTION PIN NO. SYMBOL DESCRIPTION
1 VBPRE Pre Amp Bias Voltage 15 CONS Speed Control
2 1 IN+ Channel 1 “+” Input 16 CONT Torqul Control
3 1 IN - Channel 1 “-” Input 17 VCCMO Motor Power Control
4 1 NFPRE Feedback 1 18 MOOFF Motor Forced Stop
5 1 OUTPRE Pre Amp Output 1 19 2 OUTP Power Amp Output 2
6 ATT 1 Attenuator 1 20 VCC Supply Voltage
7 CONVOL Volume Control 21 VCCPRE Supply Voltage
8 VREF Reference Voltage 22 PREOFF Pre Amp Off
9 1 OUTP Power Amp Output 1 23 ATT 2 Attenuator 2
10 GNDP Power GND 24 2 OUTPRE Pre Amp Output 2
11 VBP Power Amp Bias
12 GNDMD Motor GND 26 2 IN- Channel 2 “ -” Input
13 VCON Motor Control Voltage 27 2 IN+ Channel 2 “ +” Input
14 MOON Motor Forced Start 28 GNDPRE Pre GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Voltage
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
2IN+
2IN2NF
2OUT
ATT2
PRE
V
V
2OUT
MO
V
CON
CON
PRE
PRE
PRE
OFF
CCPRE
CC
P
OFF
CCMO
T
S
25 2 NFPRE Feedback 2
UTC UNISONIC TECHNOLOGIES CO., LTD.
QW-R110-012,A
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UTC LAG668 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS(Ta=25°C)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vcc -0.3~+7.5 V
Power Dissipation Pd 750 mW
Operating Voltage Vop 2~5 V
Operating Temperature Topr -20~+65 °C
Storage Temperature Tstg -40~+125 °C
AMPLIFIER ELECTRICAL CHARACTERISTICS(Ta=25°C)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Supply Current Icc Vin=0V, IM=0mA 18 25 mA
PRE-AMPLIFIER
Open Loop Gain Gvo Vo=-10dBm, RL=∞ 72 dB
Close Loop Gain Gvc Vo=-10dBm 40 42 44 dB
Maximum Output Voltage Vom THD=10% 0.45 0.6 Vrms
Total Harmonic Distortion THD Vout=100mVrms 0.05 0.5 %
Output Noise Voltage Von Vin=0, Rg=2.2k,
BPF(30~20k)
Input Impedance Zin Vout=-10dBm 18 22 kΩ
Cross Talk between CH CT Rg=2.2k, Vout=-10dBm 30 dB
Output Voltage when Pre-Off Vooff Vin=100mVrms -50 dB
Output Impedance when Pre-Off Rooff 10 kΩ
Input Impedance when Pre-Off Rloff 10 kΩ
Attenuator
Maximum Input Voltage Vimax 0.2 Vrms
Maximum Attenuation Vamax Vcont=Min 66 dB
Attenuation Error Vaerr Vcont=Max 0 dB
Input Impedance Zia 200 kΩ
Control Ternimal Input
Impedance
Power Amplifier
Voltage Gain GV Pout=5mW 36 38 40 dB
Channel Voltage Difference ∆GV Vcont=Max 0 3 dB
Maximum Output Power I Pom 1 THD=10%, RL=32Ω 20 28 mW
Maximum Output Power II Pom 2 THD=10%, RL=16Ω 30 mW
Total Harmonic Distortion THD Pout=5mW 0.5 2 %
Cross Talk between CH CT Pout=5mW 20 30 dB
Output Noise Voltage Von Rg=2.2k, Vcont=Max 1 2 mVrms
Ripple Rejection RR Vcc=3V, 100Hz, 100mVp-p 31 37 dB
Pre + Pulse Boost + Power Noise Vnto Vin=0V, Rg=2.2k,
*Vcc=3V, f=1kHz, RL=16Ω, unless otherwise specified.
Zicot 100 kΩ
Vcont=Max*
150 300 µVrms
3 6 mVrms
UTC UNISONIC TECHNOLOGIES CO., LTD.
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UTC LAG668 LINEAR INTEGRATED CIRCUIT
MOTOR ELECTRICAL CHARACTERISTICS(Ta=25°C)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Current Consumption IMC 3 5 mA
Starting Current IMS 500 mA
Reference Voltage Vref 0.72 0.8 0.87 V
Reference Voltage Change I Vref 1 Vcc=2.1~5V 0.05 %/V
Reference Voltage Change II Vref 2 Im=25~250mA 0.01 %/mA
Reference Voltage Change III Vref 3 Ta=-10~50°C 0.01 %/°C
Current Factor K 32 38 43
Current Factor Change I K 1 Vcc=2.1~5V 0.5 %/V
Current Factor Change II K 2 Im=25~250mA 0.05 %/mA
Current Factor Change III K 3 Ta=-10~50°C 0.02 %/°C
Saturation Voltage at Forced ON VCEsa IM=200mA, Pin 14=Vcc 0.6 V
Input Impedance at Forced ON
Pin
Leakage Current at Forced OFF IML 200 µA
Input Impedance at Forced OFF
Pin
Rion 5.6 KΩ
Ricon 33 KΩ
UTC UNISONIC TECHNOLOGIES CO., LTD.
QW-R110-012,A
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UTC LAG668 LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT 1
NOTE1 : SW12,SW12
R1,R’ =33kΩ
R2,R2’ =5.1kΩ
R3,R3’ =200kΩ
R2,R2,=5.1kΩ
C1,C’ =0.1µF
NOTE2 : See figure 1/2 for SW
UTC UNISONIC TECHNOLOGIES CO., LTD.
QW-R110-012,A
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UTC LAG668 LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT 2
UTC UNISONIC TECHNOLOGIES CO., LTD.
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UTC LAG668 LINEAR INTEGRATED CIRCUIT
FIGURE 1
Item Symbol SW No. TEST CONDITION
1 2 3,3’ 4 5 6 7 8 9 10 11 12,12’ 13,13’ Vcc=3V,f=1kHz,RL=16Ω
AMP
Supply
Current
Pre AMP
Open Loop
Gain
Maximum
Output
Voltage
Total
Harmonic
Distortion
Output
Noise
Voltage
Cross Talk
between CH
Output
Voltage
when PreOff
Attenuator
Maximum
Input
Voltage
Maximum
Attenuation
Power AMP
Voltage
Gain
Channel
Voltage
Difference
Maximum
Output
Power I
Maximum
Output
Power II
Icc
Gvo
Vom
THD
Von
CT
Vooff
Vimax
Vamax
GV
¡÷GV
Pom 1
Pom 2
c c a b b a b b b a a a a Im=0mA
b b b b b a b b b a a b b Vo=244mV
b b b b b a a b b a a b b THD=10%
b b b b b a b b b a a b b Vo=400mV
c c b b b a b b b a a b b B.P.F.(30-20kHz)
b-c c-b b b b a b b b a a b b Vo=244mV
b b b a b a b b b a a b b Vin=100mV
a a c a b a b b b a a b a Vr=Min, THD=10%,
a a c a b a b b b a a b a
a a c a b a b b b a a b a Pout=5mV
a a c a b a b b b a a b a VR=MAX
a a c a b b a b b a a b a RL=32Ω,THD=10%
a a c a a a b b b a a b a RL=16Ω,THD=10%
UTC UNISONIC TECHNOLOGIES CO., LTD.
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UTC LAG668 LINEAR INTEGRATED CIRCUIT
FIGURE 2
Item Symbol SW No. TEST CONDITION
1 2 3,3’ 4 5 6 7 8 9 10 11 12,12’ 13,13’
POWER AMP
Total
Harmonic
Distortion
Cross Talk
between CH
Output
Noise
Voltage
Ripple
Rejection
Pre + Pulse
Boost +
Power Noise
Motor
Current
Consumption
Starting
Current
Reference
Voltage
Reference
Voltage
Change I
Reference
Voltage
Change II
Saturation
Voltage at
Forced ON
Input
Impedance
at Forced
OFF Pin
*Note: a=ON, b=OFF
THD
CT
Von
RR
Vnto
IMC
IMS
Vref
Vref 1
Vref 2
VCEsa
Ricon
a c c a b a b b b a a b a Pout=5mV
a-c c-a c a b a b b b a a b a Pout=5mV
c c c b b a b b b a a b a VR=MIN
c c b a b a b b b a a b b VR=MAX
c c a b b a b b b a a b a VR=MAX, BB ON
c c a a b a b a b a a a a Im=0mA
c c a a b a b a b a a a a
c c a a b a b a b a a a a Im=100mA
c c a a b a b a b a a a a Im=100mA,Vcc=2.1-5V
c c a a b a b a b a a a a Vcc=3V,Im=25-250mA
c c a a b a b a b a a a a Im=200mA
c c a a a a b a b a a a a
UTC UNISONIC TECHNOLOGIES CO., LTD.
QW-R110-012,A
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