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STA370BWS
2.1-channel 40-W high-efficiency digital audio system Sound TerminalTM
Data brief
Features
Wide-range supply voltage, 7.0 V to 21.5 V Three power output configurations: - 2 channels of ternary PWM (2 x 20 W into 8 at 18 V) + PWM output - 2 channels of ternary PWM (2 x 20 W into 8 at 18 V) + ternary stereo line-out - 2.1 channels of binary PWM (left, right, LFE) (2 x 9 W into 4 + 1 x 20 W into 8 at 18 V) Load-driving capabilities: - 11 W into 6 at 14 V, ternary - 20 W into 4 at 14 V, ternary FFX with 100-dB SNR and dynamic range Scalable FFX modulation index (up to 100%) Selectable 32- to 192-kHz input sample rates I2C control with selectable device address Digital gain/attenuation +48 dB to -80 dB with step resolution: - 0.125 dB/step from -60 dB to +48 dB - 0.25 dB/step from -80 dB to -60 dB Soft volume update with programmable ratio Individual channel and master gain/attenuation and soft/hard mute. Two independent DRCs configurable as a dual-band anti-clipper (B2DRC) or as independent limiters/compressors with optional global DRC capability EQ-DRC for DRC based on filtered signals Dedicated LFE processing for bass boosting with 0.125-dB/step resolution Audio presets: - 15 preset crossover filters - 5 preset anti-clipping modes - Preset night-time listening mode I2S input data interface
PowerSSO-36 with exposed pad down (EPD)
Input and output channel mapping Programmable zero-detect mute Automatic invalid input-detect mute Up to 8 user-programmable biquads/channel Three coefficients banks for EQ presets storing with fast recall via I2C interface Extended filter dynamics +4/-4 for better sound shaping and easier filter implementation Bass/treble tones and de-emphasis control Selectable high-pass filter for DC blocking Advanced AM interference frequency switching and noise suppression modes F3XTM advanced PWM modulation scheme for carrier suppression (headphone or line output) Selectable high- or low-bandwidth noise-shaping topologies 96-kHz internal processing sample rate with quantization error noise shaping for very low cut-off frequency filters Full short-circuit protection at device power-up Coefficient checksum with software reset capabilities Table 1. Device summary
Package PowerSSO-36 EPD Packing Tube Tape and reel
Order code STA370BWS
STA370BWSTR PowerSSO-36 EPD
December 2009
Doc ID 16884 Rev 1
1/5
www.st.com 5
For further information contact your local STMicroelectronics sales office.
Description
STA370BWS
1
Description
The STA370BWS is an integrated solution of digital audio processing, digital amplifier controls and power output stage to create a high-power single-chip FFX digital amplifier with high-quality and high-efficiency. Three channels of FFX processing are provided. The FFX processor implements the ternary, binary and binary differential processing capabilities of the full FFX processor. The STA370BWS is part of the Sound TerminalTM family that provides full digital audio streaming to the speakers and offers cost effectiveness, low power dissipation and sound enrichment. The power section consists of four independent half-bridges. These can be configured via digital control to operate in different modes. 2.1 channels can be provided by two half-bridges and a single full-bridge, supplying up to 2 x 9 W + 1 x 20 W of output power. Two channels can be provided by two full-bridges, supplying up to 2 x 20 W of output power. The IC can also be configured as 2.1 channels with 2 x 20 W supplied by the device plus a drive for an external FFX power amplifier, such as STA533WF or STA515W. The STA370BWS flexibility is shown by the load driving capability of 11 W into 6 and 20 W into 4 with ternary modulation with a supply of 14 V. Also provided in the STA370BWS are a full assortment of digital processing features. This includes up to 8 programmable biquads (EQ) per channel. Special digital signal processing techniques are available to manage low-frequency quantization noise in filters with very low cut-off frequencies. The coefficient range -4 to +4 allows easy high-shelf filter usage and better sound shaping. Available presets enable a time-to-market advantage by substantially reducing the amount of software development needed for functions such as audio preset volume loudness, preset volume curves and preset EQ settings. There are also new advanced AM radio interference reduction modes. Dual-band DRC dynamically equalizes the system to provide linear frequency speaker response regardless of output power level. This feature separates the audio frequency band into two sub-bands independently processed to provide better sound clarity and to avoid speaker saturation. The serial audio data input interface accepts all possible formats, including the popular I2S format. The high-quality conversion from PCM audio to FFX PWM switching provides over 100 dB of SNR and of dynamic range. Full short-circuit protection is also embedded protecting output to GND, output to VCC and output to output connections. The short-circuit (fault) condition is checked at device turn-on, so if a short circuit is detected the IC does not power up. This avoids dangerous conditions, component break down and minimizes the return from the field. The new F3XTM modulation, already offered within STA369BWS, is capable of digitally filtering the PWM carrier to simplify external filtering requirements, AM interference and EMI. F3XTM is implemented in the auxiliary output of STA370BWS and it is specifically designed for application where a simple op-amp can be used to drive an auxiliary headphone line.
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Doc ID 16884 Rev 1
STA370BWS
Applications
2
Applications
Figure 1. Applications circuit
3V3 U1 1 C2 + 100uF 4 C3 5 100nF C4 1uF OUT2B 6 7 8 C6 C7 100nF 100nF OUT2A Vcc OUT1B 9 10 11 12 C9 1uF OUT1A C11 15 100nF 16 OUT3B OUT3A 17 18 13 14 2 3 GND_SUB SA TEST_MODE Vss Vcc_REG OUT2B GND2 Vcc2 OUT2A OUT1B Vcc1 GND1 OUT1A GND_REG Vdd CONFIG OUT3B OUT3A Vdd_DIG GND_DIG SCL SDA INT_LINE RESET SDI LRCKI BICKI XTI PLL_GND PLL_DC N.C. PWRDN GND_DIG Vdd_DIG TWARN/OUT4B EAPD/OUT4A 36 35 34 33 32 31 30 29 28 27 26 C8 25 2.2uF 24 23 22 21 20 19 OUT4B OUT4A PWDN C10 100nF 3V3 DATA LRCKI BICKI XTI C5 1nF SW1 RESET SCL SDA INTL1 RESET C1 100nF R1 10K
STA370BWS
Figure 2.
Output low-pass filtering
L1 OUTxA C1 100nF 22uH
R2 R1 22 6R2 C2 100nF C3 470nF R3 C4 330pF 6R2 C5 100nF 8ohm LS1
C6 100nF OUTxB L2 22uH
L1 OUTxA
22uH
C1 220nF
R1 22
R2 3R3 C2 220nF C3 1uF R3 3R3 C5 220nF 4ohm LS1
C4 330pF
C6 220nF OUTxB L2 22uH
Doc ID 16884 Rev 1
3/5
Revision history
STA370BWS
3
Revision history
Table 2.
Date 10-Dec-2009
Document revision history
Revision 1 Initial release. Changes
4/5
Doc ID 16884 Rev 1
STA370BWS
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Doc ID 16884 Rev 1
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