CONTEK MC34119 Datasheet
MC34119 LINEAR INTEGRATED CIRCUIT
LOW POWER AUDIO
AMPLIFIER
DESCRIPTION
The Contek MC34119 is a low power audio amplifier
integrated circuit, intended for the telephone
applications, such as in speakerphones. It provides
differential speaker outputs to maximize output swing
at low supply voltages. Coupling capacitor to the
speaker is not required. Open loop gain is 80dB, and
the closed loop gain is set with two external resistors.
A chips disable pin permits powering down and/or
muting the input signal.
FEATURES
*Wide operating supply voltage: Vcc=2V~16V
*Low quiescent supply current( Icc=2.7mA, typ)
*Medium output power( Po=250mW at Vcc=6V,
R
L=32ohm, THD=10%)
*Load impedance range(8 to 100ohm)
*Low distortion
*Mute function(Icc=65mA, typ)
*Minimum number of external parts required
SOP-8
DIP-8
BLOCK DIAGRAM
CONTEK
Contek
Contek Microelectronics Co.,Ltd.
http://www.contek-ic.com E-mail:sales@contek-ic.com
1
MC34119 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS(Ta=25 C )
Supply Voltage Vcc -1 to +18 V
Output Current Io +-250 mA
Maximum Input, Ripple Rejection,
Mute Pin Voltage
Applied Output Voltage( Output Pin
When Disabled)
Junction Temperature Tj -55 to +150
PIN CONFIGURATIONS
PIN NAME DESCRIPTION
1 Mute This pin can be used to power down the IC to converse power, or for muting, or both. When at a
2 Ripple
3 Input(+) Analog Ground for the amplifiers. A 1 mF capacitor at this pin ( with a 5mF capacitor at pin 8)
4 Input(-) Amplifier input. The input capacitor and resistor set low frequency roll-off and input impedance.
5 Output 1 Amplifier 1 s output. The DC level is about (Vcc~0.7V)/2.
6 Vcc DC supply voltage is applied to this pin ( Vcc=2~16V).
7 GND Ground pin.
8 Output 2
PARAMETER SYMBOL VALUE UNIT
Vi -1 to +1 V
Vo -1 to +1 V
logic LOW (less than 0.8V), the IC is enabled for normal operation. When at a logic HIGH (2V to
Vcc), the IC is disabled. If Mute is open, that is equivalent to a logic LOW .
A capacitor at this pin increase power supply rejection, and affects turn-on time. This pin can be
Rejection
left open if the capacitor at pin 1 is sufficient.
provides 52dB( typ) of power supply rejection. Turn-on time of the circuit is affected by the
capacitor on this pin. This pin can be used as an alternative input.
The feedback resistor is connected between this pin and output 1.
Amplifier 2 s output. This signal is equal in amplitude, but 180 out of phase with that output 1, the
DC level is about (Vcc~0.7V)/2.
C
RECOMMENDED OPERATION CONDITIONS(Ta=25 C)
PARAMETER SYMBOL VALUE UNIT
Supply Voltage Vcc 2~16 V
Load Impedance ZL 8~100 W
Peak Load Current IL(peak) +-200 mA
Differential Gain(5KHz Bandwidth) DGv 0~46 dB
Voltage at Mute Vi(mute) 0~Vcc V
Ambient Temperature Ta -20~470 C
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
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