ISD5216
7. FUNCTIONAL DESCRIPTION
The ISD5216 ChipCorder Product provides high quality, fully integrated, single-chip Record/Playback
solutions for 8- to 16-minute messaging applications that are ideal for use in PBX systems, cellular
phones, automotive communications, GPS/navigation systems, and other portable products. The
ISD5216 product is an enhancement to the ISD5116 architecture, providing: 1) A full-duplex Voice
CODEC with
µ-Law
and A-Law compander using the I
2
S and PCM interface ports; 2) A 2.2V
microphone bias supply for reduced noise coupling. This supply can also be used to power down the
external microphone with the system.
Analog functions and audio gating have also been integrated into the ISD5216 product to allow for
easy interfacing with integrated chip sets on the market. Audio paths have been designed to enable
full duplex conversation record, voice memo and answering machine (including outgoing message
playback).
Logic Interface Options of 2.0V and 3.0V are supported by the ISD5216 to accommodate both
portable communication (2.0- and 3.0-volt required) and automotive product customers (5.0-volt
required).
Like other ChipCorder products, the ISD5216 integrates the sampling clock, anti-aliasing and
smoothing filters, and multi-level storage array on a single chip. For enhanced voice features, the
ISD5216 eliminates external circuitry by integrating automatic gain control (AGC), a power
amplifier/speaker driver, volume control, summing amplifiers, analog switches, and a Voice CODEC.
Input level adjustable amplifiers are also included, providing a flexible interface for multiple
applications.
Recordings are stored in on-chip nonvolatile memory cells, providing zero-power message storage.
This unique, single-chip solution is made possible through Winbond’s patented multilevel storage
technology. Voice and audio signals are stored directly into solid-state memory in their natural,
uncompressed form, providing superior quality voice and music reproduction.
SPEECH/SOUND QUALITY
The ISD5216 ChipCorder product can be software configured to operate at 4.0, 5.3, 6.4, and 8.0 kHz
sampling frequencies, allowing the user a choice of speech quality options. Increasing the duration
decreases the sampling frequency and bandwidth, which affects sound quality. The "Input
Sample
Duration"
table below compares filter pass band and product durations.
DURATION
To meet end-system requirements, the ISD5216 device is a single-chip solution, which provides 8 to
16 minutes of voice record and playback, depending on the sample rates defined by the customer's
software.
Input Sample Rate to Duration Input Sample
Rate (kHz)
8.0
6.4
5.3
4.0
Duration
1
(Minutes)
8 min 3 sec
10 min 4 sec
12 min 9 sec
16 min 6 sec
Typical Filter Pass Band (kHz)
3.7
2.9
2.5
1.8
-9-
Publication Release Date: Jan. 31, 2006
Revision B.4
WINBOND [ WINBOND ]
