Preconfigured DSP System for Hearings Aids RHYTHM SB3229 Description The RHYTHM SB3229 hybrid from ON Semiconductor is a trimmer configurable DSP system based on a four channel www.onsemi.com compression circuit featuring a feedback cancellation algorithm. Based on a phase cancellation method, SB3229s adaptive feedback reduction algorithm provides added stable gain to enable extra gain 25 PAD and user comfort. It features rapid adjustment for dynamic feedback HYBRID CASE 127DN situations and resistance to tonal inputs. In addition to these adaptive algorithms, SB3229 also supports the following features: up to four channel WDRC, low distortion compression limiting, cross fading between audio paths for clickfree PAD CONNECTION memory changes, eightband graphic equalizer, eight configurable generic biquad filters, programming speed enhancements, inchannel 18 VIN2 17 1 VREG squelch to attenuate microphone and circuit noise in quiet VIN1 environments, optional peak clipping, flexible compression 19 16 2 MGND adjustments, volume control, rocker switch, noise generation for TIN TR4 Tinnitus treatment, and industryleading security features to avoid 20 cloning and software piracy. GND DAI 15 3 TR3 A trimmer interface supports manual circuit configuration. It 21 continuously monitors trimmer positions and translates them into PGND VC 14 4 TR2 2 the hearingaid parameters of choice. A Serial Data or I C Interface 22 provides full programmability at the factory and in the field. OUT+ D VC 13 5 TR1 The SB3229 hybrid contains a 256 kbit EEPROM intended for programmable and trimmer based devices. 23 SDA OUT 12 6 N/C Features VBP Adaptive Feedback Cancellation CLK 11 25 24 7 WDRC Compression with Choice of 1, 2 or 4 Channels of VB Compression 10 9 8 MS1 Auto Telecoil with Programmable Delay MS2 EVOKE Acoustic Indicators (Bottom View) Noise Generator for Tinnitus Treatment or InSitu Audiometry Frequency Response Shaping with Graphic EQ MARKING DIAGRAM Trimmer Compatibility Four ThreeTerminal Trimmers with Configurable Assignments of Control Parameters SB3229E1 2 I C and SDA Programming XXXXXX Rocker Switch Support for Memory Change and/or Volume Control Adjustment SB3229 = Specific Device Code Support for Active Hi or Active Lo Switching E1 = RoHS Compliant Hybrid XXXXXX = Work Order Number Analog or Digital Volume Control with Programmable Range High Quality 20bit Audio Processing ORDERING INFORMATION High Power/High Gain Capability See detailed ordering and shipping information on page 13 of SOUNDFIT Fitting Software this data sheet. Configurable Low Battery Indicator Semiconductor Components Industries, LLC, 2014 1 Publication Order Number: March, 2021 Rev. 7 SB3229/D N/C N/CRHYTHM SB3229 Eight Biquadratic Filters High Fidelity Audio CODEC 16 kHz or 8 kHz Bandwidth Soft Acoustic Fade between Memory Changes Four Fully Configurable Memories with Audible Drives ZeroBias TwoTerminal Receivers Memory Change Indicator E1 RoHScompliant Hybrid 96 dB Input Dynamic Range with Headroom Extension Hybrid Typical Dimensions: 128bit Fingerprint Security System and Other Security 0.220 x 0.125 x 0.060 in Features to Protect Against Device Cloning and (5.59 x 3.18 x 1.52 mm) Software Piracy These Devices are PbFree and are RoHS Compliant BLOCK DIAGRAM VB MS2 MS1 SDA CLK 910 12 11 8 PROGRAMMING INTERFACE 1 VREG REGULATOR FEEDBACK CANCELLER TONE 7 VBP GENERATOR MIC1 18 A/D PRE BIQUAD FILTERS POST BIQUAD FILTERS 3 & 4 OUT+ 14 5 + D/A PEAK CROSS HBRIDGE CLIPPING FADER MIC2 17 6 OUT 1, 2 or 4 CHANNEL MIC / TELECOIL AGCO A/D 16 COMPENSATION WDRC TIN 4 PGND EVOKE DAI 15 POST BIQUAD FILTERS VC GAIN 1 & 2 WIDEBAND GAIN 2 MGND NOISE GENERATOR BIQUAD 14 TRIMMER/VC INTERFACE SB3229 13 14 22 21 20 19 3 D VC GND VC TR1 TR2 TR3 TR4 Figure 1. Hybrid Block Diagram www.onsemi.com 2