ISD8102/ISD8104

Preliminary Data Sheet Rev 1.2

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Publication Release Date Oct 30, 2011

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 3.1).

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

speaker remains connected in both cases.

ISD8104:

The ISD8104 has differential inputs and can be configured to accept either single ended or differential

signals.