ISD5216PI datasheet(67/75 Pages) WINBOND

67 / 75 page

ISD5216

Publication Release Date: Jan. 31, 2006

- 67 -

Revision B.4

11. TYPICAL APPLICATION CIRCUIT

APPLICATIONS

The ISD5216 is a single chip solution for voice and analog storage that also includes the capability to

store digital information in the memory array. The array may be divided between analog and digital

storage, as the user chooses, when configuring the device.

Looking at the block diagram on the following page, one can see that the ISD5216 may be very easily

designed into a cellular phone. Placing the device between the microphone and the existing baseband

chip takes care of the transmit path. The SDI/SDIO of the baseband chip is connected to the

SDIO/SDI of the ISD5216. Two pins are needed for the I

2C digital control and digital information for

storage.

Starting at the MICROPHONE inputs, the input signal at the MICROPHONE inputs can be routed in

the following ways:

•

directly through the Voice band CODEC of the ISD5216 chip, then through the SDIO pin, to

output the digital PCM signal.

•

through the AGC amplifier, before it is routed to the voice band CODEC.

•

through the AGC amplifier to the storage array

•

through the AGC amplifier and mixed with an analog voice band CODEC signal coming from

the digital SDI pin

In addition, if the phone is inserted into a "hands-free" car kit, then the signal from the pickup

microphone in the car can be passed through to the same places from the AUX IN pin and the

phone's microphone is switched off. In this scenario, the other party's voice from the phone would be

played into the PCM IN input and passed through to the AUX OUT pin that would drive the car kit's

loudspeaker.

INT

SCL

SDA

ISD5216PI Datasheet(PDF) 67 Page - Winbond