文档介绍：ISD8102/ISD8104
ISD8102 / ISD8104
2W Class AB Audio Amplifier
with Chip Enable
i) ISD8102 - Earphone Sense IN (SE / Diff)
ii) ISD8104 - Differential Input pair
Preliminary Data Sheet Rev - 1 - Publication Release Date Oct 30, 2011
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ISD8102/ISD8104
1 GENERAL DESCRIPTION
The ISD8102/ ISD8104 are a general purpose analog audio amplifier, capable of driving a 4Ω load with
up to 2Wrms output power. This device includes output current limiting, chip enable, low standby
current and excellent pop-and-click suppression.
Also included is the ability to configure the input as either single-ended or differential. Internal resistors
set the device to have default 20dB gain (ISD8102/ISD8104), and with external resistors any gain less
than this can be achieved. The device is unity gain stable, including use with external feedback
resistors and external capacitors as may be optionally used for implementing simple filtering functions.
ISD8102:
The ISD8102 output can be configured to drive either single ended or bridge tied loads (BTL). The
Mode pin controls which configuration is active. This function is useful when using the IDS8102 to
alternate between driving a speaker or a mono earpiece which is connected through a shorting phone
jack. The Mode pin is connected to the normally closed pin of the shorting phone jack (see figure ).
When nothing is plugged into the jack, the external resistor holds the Mode pin low, enabling BTL
mode. When a plug is inserted, the switch is opened and the mode pin goes to 1/2 VDD, as controlled
by the resistor divider, putting the amplifier into single ended mode. Note that in this example, the
spe