Typical Application
LA4166M
Figure 1. Application circuit
Note the external components are used to determine the
LA4166M operating characteristics. For example, C2
determines the playback equalization characteristic, R8
determines the preamplifier gain, C8 and R4 determine
the ALC attack and recovery times and C17 determines
the power supply ripple rejection. The ripple rejection
decreases as the capacitance C17 is decreased.
Other components are used to determine the overall cir-
cuit characteristics. For example, C1 and R1 determine
the recording current and C7 prevents output oscillations.
Note also that LA4166M internal components determine
other LA4166M characteristics. For example, the 2.2kΩ
PRE IN input resistor determines the ALC range, and
the 1kΩ and 30kΩ resistors at the power amplifier in-
verting input determine amplifier gain.
In addition, LED DRIVE should be left open when not
using the LED indicator function, the double-pole switch
that controls LED DRIVE is normally closed, the NC
pins should be left open, and the GND pins should be
tied to ground
No.3977–6/7