GA3216 ONSEMI | Alldatasheet
Document overview
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Technical content
Features
- Efficient, High Fidelity 1 or 2−Channel WDRC Signal Processing
- Fully Programmable via Serial Data Interface
- High−Fidelity Audio Quality
- Four Trimmer Inputs plus V olume Control
- Flexible Trimmer/Parameter Assignments
- Optional Two−Terminal or Three−Terminal Trimmers
- Choice of Wideband or Independent 2−Channel Level Detection
- Choice of Two Strategies for AGC−I Parametric Adjustment
- 6, 12 or 24 dB/Octave Band Split Filter or Configurable as Single−Channel Compressor
- In−Channel, Low Level Squelch Control (1:2 Expansion)
- Output Compression Limiting (AGC−O)
- Flexible Pre− and Post−Emphasis Filters
- Four Independent Memories
- Pulse−Density−Modulated Output Stage Drives Zero−Bias 2−Terminal Receivers
- High-Power Drive Capability
- Unused Blocks can be Powered Down
- thinSTAX® Packaging
- Also Available as E1 RoHS Compliant Hybrid thinSTAX Packaging
- Hybrid Typical Dimensions: 0.190 x 0.123 x 0.060 in. (4.82 x 3.12 x 1.52 mm) www.onsemi.com
20 PAD
GA3216−E1 XXXXXX GA3216 = Specific Device Code E1 = RoHS Compliant Hybrid XXXXXX = Work Order Number (Bottom View) MS2 MS SDA VB VBP MGND IN T TR1 TR3 VC GND1 PGND VREG TR2 OUT− OUT+ TR4VREG2GND2 16 1715 98 7 See detailed ordering and shipping information on page 14 of this data sheet.
ORDERING INFORMATION
Figure 1. Foundation GA3216 Block Diagram Table 1. ABSOLUTE MAXIMUM RATINGS should not be assumed, damage may occur and reliability may be affected. WARNING: Electrostatic Sensitive Device − Do not open packages or handle except at a static−free workstation. except under controlled conditions.
Table 2. ELECTRICAL CHARACTERISTICS − PART 1 performance may not be indicated by the Electrical Characteristics if operated under different conditions.
- Total System Gain consists of: Wideband System Gain + High and Low Independent Channel Gains + Converter Gain.
Total System Gain is calibrated during Cal/Config process.
- Volume control is log taper, trimmers are linear taper.
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
- Total System Gain consists of: Wideband System Gain + High and Low Independent Channel Gains + Converter Gain.
Total System Gain is calibrated during Cal/Config process.
- Volume control is log taper, trimmers are linear taper.
Table 3. ELECTRICAL CHARACTERISTICS − PART 2
- Total System Gain consists of: Wideband System Gain + High and Low Independent Channel Gains + Converter Gain and accuracy of this
parameter is dependent on accuracy of the components. *Peak output is defined as largest sine wave possible at the resonant frequency of the receiver.
Figure 6. Example of Assembly Diagram for Two−Terminal Trimmer Circuit
www.onsemi.com FOUNDATION GA3216 OVERVIEW The Foundation GA3216 hybrid comprises a configurable two−channel compressor circuit with two methods of operation programmable mode and trimmer mode. It may be configured as a one or two channel device with linear or WDRC processing. Configuration data stored in non−volatile memory defines hearing−aid parameters. This data needs to be uploaded to the hybrid before the circuit becomes functional. The Foundation GA3216 hybrid is programmed via the SDA pin using industry −standard programming boxes. Configuration data is generated by an ARK product component library (DLL). Foundation GA3216 is fully supported by ON Semiconductor’s software tools available from the ARKonline ® website http://ark.onsemi.com/ During normal trimmer mode operation, a low−speed A/D circuit monitors the positions of up to four manual trimmers and a VC potentiometer. Trimmer position changes are immediately interpreted and translated into new circuit parameter values, which are then used to update the signal path. ON Semiconductor’s Library Manager in ARKonline tool enables pre −defining of trimmer assignments for all common functions such as low −cut, high−cut, notch and resonant−peak−shift filtering, AGC parameters, wideband gain, and maximum power output (MPO). SIGNAL PATH There are two main audio input signal paths. The first path contains the Microphone and second path contains the Telecoil input as selected by a programmable MUX. The microphone input is intended as the main audio input for single−microphone applications. The two audio inputs are buffered, sampled and converted into digital form using an A/D converter. The digital output is then converted into a 32 kHz 20−bit digital audio signal. It is possible to save current by reducing the sampling rate to 24 kHz, which reduces the system’s bandwidth from 16 kHz to 12 kHz. In Telecoil mode, gains are trimmed during the Cal/Config process to compensate for microphone/Telecoil mismatches. The Telecoil input may also be used as a second microphone input, in which case the Telecoil compensation would be disabled. This can be achieved via the ARKonline wizard. The wideband detector circuit output is routed to a band−split filter that divides the signal into two frequency bands. There is an option to configure the hybrid as a single channel device that shuts down and bypasses the band−split filter. The signal in each frequency band is processed by an independent AGC loop. The gain in any band is a function of the energy detected in that band or the overall detected wide−band ener gy. The two frequency bands are then summed back into a wide−band signal. Further processing capabilities include a 1st to 3rd order low cut filter before the band −split filter. After the two channels are summed together, there is a 1st or 2nd order high cut filter, and three EQ filters, followed by volume control, low−distortion AGC−O, and two post−AGC−O EQ filters. All AGC loops use a feed −forward topology to ensure system stability. Detectors in the AGCi path and AGC −O path are twin fast/slow detectors with independently adjustable attack and release time constants. The squelch detector residing in the AGCi path is implemented as a single fast/slow detector. FUNCTIONAL BLOCK DESCRIPTION A/D and D/A Converter The system’s A/D converter is a 2nd−order sigma−delta modulator operating at a 2.048 MHz sample rate. The system’s input is pre−conditioned with anti−alias filtering and a programmable gain pre−amplifier. The analog output is oversampled and modulated to produce a 1 −bit pulse density modulated (PDM) data stream. The digital PDM data is then decimated down to pulse −code modulated (PCM) digital words at the system’s sampling rate of 32 kHz. The D/A is comprised of a digital 3rd−order sigma−delta modulator and an H −bridge. The modulator accepts PCM audio data from the DSP path and converts it into a 32−times oversampled, 1 −bit PDM data stream, which is then supplied to the H −bridge. The H −bridge is a specialized CMOS output driver used to convert the 1−bit data stream into a low−impedance, differential output voltage waveform suitable for driving zero−biased hearing aid receivers. Channel Processing Figure 12 represents the I/O characteristic of independent AGC channel processing. The I/O curve can be divided into four main regions:
- Low input level expansion (squelch) region
- Low input level linear region
- Compression region
- High input level linear region (return to linear)
Figure 12. Independent Channel I/O Curve Flexibility
- Squelch threshold (SQUELCHTH)
- Low level gain (LLGAIN)
- Lower threshold (LTH)
- High level gain (HLGAIN)
- Upper threshold (UTH)
- Compression ratio (CR) During the Parameter Map creation, constraints are applied to the compression parameters to ensure that the I/O characteristics are continuous. In both Programmable mode and Trimmer mode, pre −defined parameter adjustments support two popular styles of compression ratio adjustment: The compression region of the I/O curve pivots about the upper threshold. As the compression ratio trimmer is adjusted, high −level gain remains constant while the low−level gain changes. The compression region of the I/O curve pivots about the lower threshold. Low −level gain remains constant as the compression ratio trimmer is adjusted. The two compression channels can be controlled in tandem using a common wideband level detector, or independently using dedicated in −channel level detectors. Parameters such as low level gain, lower threshold and compression ratio can be combined and controlled by a single trimmer. The squelch region within each channel implements a low level noise reduction scheme (1:2 expansion) for listener comfort. This scheme operates in quiet listening environments (programmable threshold) to reduce the gain at very low levels. Single−channel compressor operation is supported by disabling the band split filter and one of the channel compressors. The remaining compressor can be configured as a wide −dynamic−range compressor (WDRC), or as an input compression limiter (ICL). HRX/C0116 Head Room Expander The Foundation GA3216 contains an enhanced Head Room Expander (HRX) circuit, which increases the input dynamic range of the Foundation GA3216 without any unwanted audible artifacts. This is accomplished by dynamically adjusting the preamplifier’s gain and the post−A/D attenuation depending on the input level. Telecoil Path The telecoil input is calibrated during the Cal/Config process. To compensate for the telecoil/microphone frequency response mismatch, a first order filter with 500 Hz corner frequency is implemented. Through ARKonline, it is possible to implement a telecoil compensation filter with an adjustable corner frequency. To accommodate for the gain mismatch, the telecoil gain is adjusted to match the microphone gain at 500 Hz or 1 kHz (default) and is selectable in ARKonline. There is also a telecoil gain adjustment parameter that can be enabled in ARKonline and set in IDS, enabling manual adjustment of the telecoil gain compensation. Volume Control & Trimmers All parameters can be controlled via the SDA or assigned to the trimmers. The four trimmers have flexible parameter assignments so that any of them can be assigned to any available parameters. For a complete list of parameters, see ARK Online. Both the external VC and trimmers can be configured to work with either a two−terminal 200 k/C0087 variable resistor or a three −terminal 0.1 M /C0087 – 1 M /C0087 variable resistor. The volume control should have a log taper, while the trimmers should have a linear taper. In two−terminal configuration, the trimmers and VC are connected between GND and the trimmer Input and in three−terminal configuration between GND, Vreg and the trimmer Input. To enable the device to use two terminal trimmers, in IDS under Settings in the Cal/Config menu, on the trimmers tab select two terminal trimmers. If using two terminal trimmers, they must be calibrated before use. Calibration is not necessary with three terminal trimmer pots. Hysteresis is built into the circuitry to prevent unintentional level toggling. Equalization Filters There are five equalization filters provided on the Foundation GA3216 Digital for additional frequency shaping. Each EQ filter has three adjustable parameters, centre, depth and Q. One of these parameters can be selected as trimmer adjustable for each filter. For added flexibility, it is possible to combine EQ2 and EQ3, or EQ4 and EQ5, together and have them adjusted by one trimmer. AGC−O The AGC−O module is an output limiting circuit with a fixed compression ratio of ∞ : 1. The limiting level is programmable as a level measured in dB from full scale. The maximum output of the device is 0 dBFS. The AGC −O
attack and release time constants. tremendous flexibility in switching between configurations. mode, the device must be set to pull−down. static switch, selectable using ARKonline.
- Momentary Switch on MS
- Momentary Switch on MS, Static Switch on MS2 (jump to last memory)
- Static Switch on MS and MS2
- Static Switch on MS, Static Switch on MS2 (jump to last memory) Momentary Switch on MS This mode uses a single momentary switch on MS (Pin 13) to change memories. Using this mode causes the part to start in memory A, and whenever the button is pressed, the next valid memory is loaded. When the user is in the last valid memory, a button press causes memory A to be loaded. Example: If 4 valid memories: ABCDABCDA… If 3 valid memories: ABCABCA… If 2 valid memories: ABABA… If 1 valid memories: AAA… Momentary Switch on MS, Static Switch on MS2 (Jump to Last Memory) This mode uses a static switch on MS2 (Pin 14) and a momentary switch on MS (Pin 13) to change memories. If the static switch is OPEN, the part starts in memory A and it behaves like momentary, with the exception that the last valid memory is not used. If the static switch on MS2 is set to HIGH, the part automatically jumps to the last valid memory (occurs on startup or during normal operation). In this setup, the momentary switch’s state is ignored. This prevents memory select beeps from occurring. When MS2 is set to OPEN, the part loads in the last select memory. Example: If MS2 = OPEN and there are 4 valid memories: ABCABCA… If MS2 = OPEN and there are 3 valid memories: ABABA… If MS2 = HIGH and there are 4 valid memories: D… If MS2 = HIGH and there are 3 valid memories: C…
Table 4. DYNAMIC EXAMPLE WITH FOUR VALID MEMORIES (T = momentary switch is toggled; 0 = OPEN; 1 = HIGH) This mode uses two static switches to change memories. memory before reaching the final memory. Table 5. MEMORY SELECTIONS USING MS and MS2
This mode uses two static switches to change memories. last valid memory when the static switch on MS2 is HIGH. memories (even if four valid memories are programmed). Table 6. MEMORY SELECTIONS USING MS and MS2 intermediate memory before reaching the final memory. when switching MS when MS2 is HIGH. the part defaults to memory A. produce tones to indicate a memory change. settings and can be individually selected for each memory. Table 7. MEMORY CHANGE BEEPING CODE the user of low battery voltage. above the turn−ON threshold again.
www.onsemi.com and remains there until the supply voltage drops below approximately 0.3 V and subsequently rises above the turn−ON threshold after shutdown. The third is a combination of these two modes, where the device starts up in shallow −reset mode initially, then changes over to deep−reset mode after 5 minutes. The fourth option is to have the gain reduced as the battery voltage drops. When the supply falls below the low battery threshold the low battery tones will be emitted and the wideband gain will be reduced by 3 dB. As the battery voltage continues to drop, the low battery tones will continue and the wideband gain will continue to be reduced until the turn−OFF threshold is reached when the device will shut down. Current Consumption Typical current consumption of the Foundation GA3216 Digital, as stated in the Electrical Characteristics section, is measured at a specific configuration and settings. If lower current is desired, it can be achieved by selecting a 24 kHz sampling rate from the settings tab in IDS, reducing the system’s bandwidth from 16 kHz to 12 kHz. Software Full software support is provided for every stage of development from design to manufacturing to fitting. For details, refer to the Getting Started with ARK Software Guide. SDA Communication The Foundation GA3216 Digital is programmed via the SDA pin using industry standard programming boxes. During parameter changes, the main audio signal path of the hybrid is temporarily disabled and replaced with a low gain bypass path to avoid the generation of disturbing audio transients. Once the changes are complete, the main audio path is re−activated. Any changes made during programming are lost at power−off unless they are explicitly burned to EEPROM memory. Power Management The Foundation GA3216 Digital was designed to accommodate high power applications. AC ripple on the supply can cause instantaneous reduction of the battery’s voltage, potentially disrupting the circuit’s function. The Foundation GA3216 has a separate power supply and ground connection for the output stage. This enables hearing instrument designers to accommodate external RC filters to minimize any AC ripple from the supply line. Reducing this AC ripple greatly improves the stability of the circuit and prevents unwanted reset of the circuit caused by spikes on the supply line. For more information on properly designing a filter to reduce supply ripple, refer to the Using DSP Hybrids in High Power Applications Initial Design Tips information note. Device Package Shipping† GA3216−E1 20 Pad Hybrid 25 Units / Bubble Pack GA3216−E1−T 20 Pad Hybrid 250 Units / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. Hybrid Jig Ordering Information To order a Hybrid Jig Evaluation Board for Foundation GA3216 contact your Sales Account Manager or FAE and use part number GA3216GEVB.
Table 8. PAD POSITION AND DIMENSIONS
www.onsemi.com PACKAGE DIMENSIONS Dimension units are in inches. Dimensions in parentheses are in millimeters, converted from inches and include minor rounding errors. 1.000 inches = 25.4 mm Dimension tolerances: ±0.005 (±0.13) unless otherwise stated.
- = location of Pin 1 RoHS compliant hybrid, MSL#4, 240°C peak reflow, SAC305 This Hybrid is designed for either point−to−point manual soldering or for reflow according to ON Semiconductor’s reflow process. 0.190 (4.82) 0.123 (3.12)
0.065 MAX
(1.60) 0.165 (.419) 0.0185 (.470) GA3216−E1 ON Semiconductor and the are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidia ries in the United States and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5817−1050 GA3216/D HRX is a trademark of Semiconductor Components Industries, LLC. thinSTAX, PARAGON, and ARKonline are registered trademarks of Semiconductor Components Industries, LLC. LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor 19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative