PRODUCT BRIEF
STMP3400
Integrated Mixed-Signal Solutions
Audio Decoder with USB Interface
and Voice Record
LINE-to-LINE SNR >95 dB
USB download drivers
Interface to a host chip/processor
Upgradeable firmware
DSP maximum speed is 50 MHz
Supports SDMI
Energy saving dynamic power management
Bass and Treble control; configurable multiple
band control
FM radio input and control support
Three analog line-level inputs: Line_In, FM_In,
and Mic
100-pin LQFP
Crystal rate is 24.576 MHz
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FEATURES
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MP3 decode
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NAND Flash, SmartMedia, MMC, Secure Digital,
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CompactFlash, and IDE Support
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Designed for up to 20 hour operation from AA
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battery, as well as other battery options
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USB download interface
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LCD Interface
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GPIO and button I/O controls
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Voice record in ADPCM format
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Volume control on record and playback
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Full analog mixer configuration
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Drive headphones directly
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High performance 18-bit
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technology
DESCRIPTION
SigmaTel鈥檚 STMP3400 is a single-chip digital music
system for dedicated audio players, PDAs and cell
phones. It includes an audio decoder with a high per-
formance DSP, ADPCM record capabilities and a USB
interface for downloading music and uploading voice
recordings. STMP3400 also provides an interface to
flash memory, LCD, button and switch inputs, head-
Host Processor
(Optional)
90
94
98
FM Tuner
(Optional)
Microphone
Voice Record
phones, microphone and FM radio input and control.
The STMP3400鈥檚 programmable architecture supports
the MP3 digital audio standard. The end-user can
update software on through USB. For devices like
PDAs and cell phones, STMP3400 can act as a slave
chip to a host chip/processor. The STMP3400 has low
power consumption to allow long battery life with a AA
or AAA battery. The
DACs include a head-
phone driver to directly
drive low impedance
Battery
headphones. The ADCs
include inputs for both
Microphone and Analog
LDC Screen
Audio In to support voice
recording and FM radio.
SigmaTel's
proprietary
Sigma-Delta (
危鈭?
tech-
nology achieves a DAC
SNR in excess of 95 dB.
The STMP3400 is com-
pliant with Phase 1 of the
Secure Digital Music Ini-
Headphones
tiative (SDMI).
Flash Memory
Buttons/Switches
5-3400-P1-1.0-1201
10
2
10
6
S
TM
P
34
00
1
2
3
