Portable Audio
High-Performance “Smart” Touch-Screen
Controllers with Integrated Low-Power
Audio Converters
TSC2301, TSC2302
Get samples, datasheets, evaluation modules and app reports at:
www.ti.com/sc/device/TSC2301
or
www.ti.com/sc/device/TSC2302
45
Low-Voltage, Low-Power Stereo DACs
PCM177x
Get samples, datasheets, evaluation modules and app reports at:
www.ti.com/sc/device/PARTnumber
(Replace
PARTnumber
with
PCM1770, PCM1771, PCM1772
or
PCM1773)
The TSC2301 is a 4-wire smart touch-screen controller (TSC) with an
integrated audio codec, a headphone/speaker amplifier and a 12-bit
battery/temperature/auxiliary measurement ADC. The TSC2301
includes a keypad controller and 6 additional GPIO pins.
Key Features
• 4-wire smart touch-screen controller
• 4 x 4 keypad interface (TSC2301 only)
• 6 GPIO pins (TSC2301 only)
• Full stereo codec supporting up to 48 kSPS
• 98-dB stereo playback with 27-mW power dissipation
• 8-bit DAC for LCD contrast control
• Integrated PLL for flexible audio clock generation
• 27-mW stereo headphone driver with capless output option
• Programmable digital audio bass/treble/EQ/de-emphasis
• Microphone preamp and hardware automatic gain control
• Direct battery measurement accepts up to 6-V input
• On-chip temperature and auxiliary-input measurement
• Packaging: 6 x 6 mm 120-ball BGA (TSC2301), 64-pin TQFP
(TSC2301), 7 x 7 mm 48-pin QFN (TSC2302)
Applications
• Smart phones
• PDAs
• Portable media players
• Low-power audio products
The PCM177x family provides entry-level DACs for audio playback. The
PCM1770/71 provide an integrated headphone drive, while the
PCM1772/73 provide a line output drive. The PCM1771/73 are config-
ured with hardware pins, while the PCM1770/72 include a three-line
software control port.
Key Features
• Dynamic range: 98 dB (typ)
• THD+N: 0.1% (typ)
• Headphone driver at 16
Ω:
13 mW stereo, 26 mW monaural
(PCM1770/71)
• Low power dissipation: 6.5 mW with V
CC1
, V
HP
= 2.4 V
• System clock: 128 f
S
, 256 f
S
or 384 f
S
• Sampling frequency: 5 to 50 kHz
• Digital attenuation: 0 to –62 dB, 1 dB/step
• 44.1-kHz digital de-emphasis
• Digital soft mute
• Circuit free of “pops”
• 1.6- to 3.6-V single power supply
• 3.3-V tolerance
• Packaging: 4.2 x 4.2 mm 20-pin VQFN, 16-pin TSSOP
Applications
• Multifunction Internet audio players (portable audio players, cell
phones, PDAs, digital cameras, etc.)
• Portable CD players
• Portable jukeboxes
• Portable radios and boom boxes
Mic In
Touch
Screen
Aux
Aux
VBAT In
VBAT In
4-Wire
Touch
Screen
Battery
Temp
Monitor
6 GPIOs
SAR
ADC
Control
Interface
4x4 Keypad
Controller
DAC
Screen
Contrast
Left HP
Out
Control Port
Left (HP) Out
Mixer
Right (HP) Out
DAC
Audio Interface
ADC
Left In
Right In
Mic In
Mixer
PGA
ADC
Volume
Control
Equalizer
DAC
DAC
Clock
In
Volume
Control
Left
Line Out
Mixer
Right
Line Out
Right HP
Out
Mono
Line Out
DAC
Audio Interface
PLL/
Oscillator
TSC2301 block diagram.
PCM177x block diagram.
Texas Instruments 1Q 2006
Audio Solutions Guide
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