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STMicroelectronics |
STA382BW
Sound Terminal®
2.1-channel high-efficiency digital audio system
Datasheet − preliminary data
Features
■ Wide-range supply voltage
– 4.5 V to 26 V (operating range)
VQFN48 (7 x 7 mm)
– 30 V (absolute maximum rating)
)■ I2C control with selectable device address
t(s■ Embedded full IC protection
uc– Manufacturing short-circuit protection (out
dvs. gnd, out vs. vcc, out vs. out)
ro– Thermal protection
P– Overcurrent protection
te– Undervoltage protection
le■ 1 Vrms stereo analog input
o■ I2S interface, sampling rate 32 kHz ~ 192 kHz,
bswith internal sampling frequency converter for
Ofixed processing frequency
-■ Three output power stage configurations
t(s)– 2.0 mode, L/R full bridges
– 2.1 mode, L/R two half-bridges, subwoofer
cfull bridge
du– 2.1 mode, L/R full bridges, PWM output for
roexternal subwoofer amplifier
P■ Driving load capabilities
te– 2 x 20 W into 8 Ω ternary modulation
le– 2 x 9 W into 4 Ω + 1 x 20 W into 8 Ω
o■ FFXTM 100 dB dynamic range
bs■ Fixed output PWM frequency at any input
O sampling frequency
■ Headphone
– Embedded negative charge pump
– Full capless output configuration
– Driving load capabilities: 40 mW into 32 Ω
■ Line out
– 2 Vrms line output capability
■ Up to 12 user-programmable biquads with
noise-shaping technology
■ Direct access to coefficients through I2C
shadowing mechanism
■ Fixed (88.2 kHz / 96 kHz) internal processing
sampling rate
■ Two independent DRCs configurable as a
dual-band anticlipper or independent
limiters/compressors (B2DRC)
■ Digital gain/att +48 dB to -80 dB with
0.125 dB/step resolution
■ Independent (fade-in, fade-out) soft volume
update with programmable rate 48 ~ 1.5 dB/ms
■ Bass/treble tones control
■ Audio presets: 15 crossover filters,
5 anticlipping modes, nighttime listening mode
■ STSpeakerSafeTM protection circuitry
– Pre- and post-processing DC blocking
■ Embedded RMS meter for measuring real-time
filters
loudness
– Checksum engine for filter coefficients
■ Two analog outputs
– PWM fault self-diagnosis
– Selectable headphone / line out driver with
adjustable gain via external resistors
■ STCompressorTM dual-band DRC
– New F3XTM analog output
Table 1. Device summary
■ New fully programmable noise-gating function
Order code
Package
Packing
STA382BW
STA382BWTR
VQFN48
VQFN48
Tray
Tape and Reel
April 2012
Doc ID 022783 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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www.st.com
1
Contents
Contents
STA382BW
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.1 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
t(s)3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
c3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
du3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
ro3.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
P3.4 Electrical specifications for the digital section . . . . . . . . . . . . . . . . . . . . . 23
lete3.5 Electrical specifications for the power section . . . . . . . . . . . . . . . . . . . . . 24
o3.6 Electrical specifications for the analog section . . . . . . . . . . . . . . . . . . . . . 25
Obs4 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
) -4.1 Processing data path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
t(s4.2 Input oversampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
uc4.3 STCompressorTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
rod4.3.1 STC block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
P4.3.2 Band splitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
te 4.3.3 Level meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
le 4.3.4 Mapper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
so 4.3.5 Attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Ob 4.3.6 Dynamic attack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.3.7 Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.3.8 Stereo link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.3.9 Programming of coefficients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.3.10 Memory map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5 I2C bus specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.1 Communication protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.1.1 Data transition or change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
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