CONTEK LAG668 Datasheet
LAG668 LINEAR INTEGRATED CIRCUIT
RADIO AND CASSETTE RECORDER
CIRCUIT
DESCRIPTION
The Contek 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
CONTEK
1/2 Vcc
1 2
Pre Amp
Pre Amp
Bias
Control
Attenuator
V/I
Attenuator
6 7
Power Amp
Motor
1/2 Vcc
Power
Amp
8283 4 5
9 11 10 12
Control
Power Amp
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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LAG668 LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
V BPRE
1IN+
1IN-
PRF
INF
IOUT
ATT1
CON VOL
V REF
1OUT P
GND P
V BP
GND MD
V CON
MO ON
PRE
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Contek
LAG668
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GND
2IN+
2IN-
2NF
2OUT
ATT2
PRE OFF
V CCPRE
V CC
2OUT P
MO OFF
V CCMO
CON T
CON S
PRE
PRE
PRE
PIN NO. SYMBOL DESCRIPTION PIN NO. SYMBOL DESCRIPTION
1VBPRE 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
41NFPRE Feedback 1 18 MOOFF Motor Forced Stop
51OUTPRE 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
8VREF Reference Voltage 22 PREOFF Pre Amp Off
91OUTP 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
25 2 NFPRE Feedback 2
Voltage
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
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
2
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 kW
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 kW
Input Impedance when Pre-Off Rloff 10 kW
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 kW
Control Ternimal Input
Impedance
Power Amplifier
Voltage Gain GV Pout=5mW 36 38 40 dB
Channel Voltage Difference DGV Vcont=Max 0 3 dB
Maximum Output Power I Pom 1 THD=10%, RL=32W 20 28 mW
Maximum Output Power II Pom 2 THD=10%, RL=16W 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=16W, unless otherwise specified.
Zicot 100 kW
Vcont=Max*
150 300 mVrms
3 6 mVrms
CONTEK
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
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