technical data
il34119
low power audio amplifier

pin assignment
simplified block diagram
il34119
pin description

vin vo1 vcc gnd vo2
design guidelines general
amplifiers
referring to the block diagram, the internal configuration consists of two identical operational amplifiers. amplifier 1 has an open-loop gain of 80 db (at f 100 hz), and the closed loop gain is set by external resistors rf and ri. the amplifier is unity gain stable, and has a unity gain frequency of approximately 1.5 mhz. in order to adequately cover the telephone voice band (300-340 hz), a maximum closed loop gain of 46 db is recommended. amplifier 2 is internally set to a gain of -1.0 (0 db). the outputs of both amplifiers are capable of
fc1 and fc2
power supply rejection is provided by the capacitors (c1 and c2 in the simplified block diagram) at fc1 and fc2. c2 is somewhat dominant at low frequencies, while c1 is dominant at high frequencies. the reguired values of c1 and c2 depend on the conditions of each application. a
il34119
chip disable

layout considerations
normally a snubber is not needed at the output of the il34119, unlike many other audio amplifiers. however, the pc board layout, stray capacitances, and the manner in which the speaker wires are configured, may dictate otherwise. generally the speaker wires should be twisted tightly, and be not more than a few inches in length.
power dissipation
figures 2-4 indicate the device dissipation (within the ic) for various combinations of vcc, rl,
maximum ratings
symbol vcc iout vin vvo tstg
parameter supply voltage maximum output current at vo1, vo2 maximuminput voltage(fc1, fc2, cd, vin) applied output voltage to vo1, vo2 when disabled storage temperature range
maximum ratings are those values beyond which damage to the device may occur. functional operation should be restricted to the recommended operating conditions.
il34119
recommended operating conditions

this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. for proper operation, vin and vout should be constrained to the range gnd(vin or vout)vcc. unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or vcc). unused outputs must be left open.
il34119
power supply icc1 icc2

figure 1. power supply current
figure 2. device dissipation 8.0 load
il34119
figure 3. device dissipation 16 load
figure 4. device dissipation 32 load
figure 8. maximum allowable load power