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Teilenummer | GA3219 |
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Beschreibung | Pre-configured DSP System | |
Hersteller | ON Semiconductor | |
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Gesamt 14 Seiten VENTURE GA3219
Pre-configured DSP System
for Hearing Aids
Description
VENTURE GA3219 combines the power capabilities of an
advanced platform with advanced research, delivering cutting-edge
features and high performance.
This hardware platform is ON Semiconductor’s industry−leading
programmable digital signal processing platform. Adaptive
Algorithms is a methodology developed by ON Semiconductor that
couples state−of−the−art acoustic algorithms to ensure high−fidelity
digital sound quality.
Venture GA3219’s adaptive noise reduction preserves perceived
speech levels without causing distortion. It monitors noise levels
independently in 128 individual bands. This strategy also employs
advanced psychoacoustic models to eliminate audible noise and
reduce the amount of perceptible artifacts introduced by the noise
reduction process.
Based on a phase cancellation method, Venture GA3219’s adaptive
feedback reduction algorithm provides increased maximum stable
gain unlike other feedback strategies. Additionally, it features rapid
adjustment for dynamic feedback situations and resistance to tonal
inputs.
In addition to these adaptive algorithms, Venture GA3219 also
supports the following features: Frontwave® directional processing,
cross fading between audio paths for click−free memory changes,
8−band graphic equalizer, 8 generic biquad filters (configurable as
parametric or other filter types), programming speed enhancements,
optional peak clipping, flexible compression adjustments,
programmable tones for memory change and low battery indicators,
wideband gain, volume control and industry−leading security features
to avoid cloning and software piracy.
Features
• Adaptive Algorithms:
♦ 128−band Adaptive Noise Reduction
♦ Adaptive Feedback Cancellation
• 128−bit Fingerprint Security System and Other Security Features to
Protect Against Device Cloning and Software Piracy
• Soft Acoustic Fade Between Memory Changes
• FrontWave Directional Processing
• High Fidelity Audio CODEC
• 20−bit Audio Precision
• 95 dB Input Dynamic Range with HRXt Headroom Extension
• 1, 2 or 4 Channel WDRC Compression
• 8−Band Graphic EQ
• Eight Biquadratic Filters
• Drives Zero−Bias 2−Terminal Receivers
• Four Analog Inputs
• Two Memory Select Pads
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16 PAD
HYBRID
CASE TBD
FMIC
PAD CONNECTION
MGND
15 16
1
VREG
RMIC
14
2 TIN
VC
SDA
13
12
GND
11
PGND
10
3 DAI
4 MS
5 MS2
6 VB
98
7
OUT+ OUT−
(Bottom View)
VBP
MARKING DIAGRAM
GA3219D−E1
XXXXXX
GA3219D
E1
XXXXXX
= Specific Device Code
= RoHS Compliant Hybrid
= Work Order Number
ORDERING INFORMATION
See detailed ordering and shipping information on page 12 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
August, 2015 − Rev. 4
1
Publication Order Number:
GA3219/D
VENTURE GA3219
Front
Mic
+
T−coil
MS
switch
(N.O.)
Rear
Mic
+
+−
Zero Biased
Receiver
CS44
VC
Figure 4. Typical Hearing Instrument Assembly Diagram
VENTURE GA3219 OVERVIEW
Venture GA3219 is a DSP system with adaptive
algorithms that run on an advanced hardware platform. This
hardware platform is a combination of a DSP core and a high
fidelity audio CODEC. As well, thinSTAX packaging
provides easy integration into a wide range of applications
from CIC to BTE.
The audio functions implemented on the CODEC include
tone generation, peak clipping and cross fading between
audio paths. The DSP core implements Frontwave
directional processing, programmable filters, adaptive
algorithms, compression, wideband gain, and volume
control. The adaptive algorithms include Adaptive Noise
Reduction and Adaptive Feedback Cancellation.
The Adaptive Noise Reduction reduces audible noise in a
low distortion manner while preserving perceived speech
levels. The Adaptive Feedback Canceller reduces acoustic
feedback while offering robust performance against pure
tones. As well, Venture GA3219 contains security features
to protect clients’ Intellectual Property against device
cloning and software piracy.
Venture GA3219 utilizes the power and capabilities of the
hardware platform to deliver advanced features and
enhanced performance previously unavailable to a product
in its class.
This data sheet is part of a documentation set available for
this product.
SIGNAL PATH
There are two main audio input signal paths. The first path
contains the front microphone and the second path contains
the rear microphone, telecoil or direct audio input as selected
by a programmable MUX. The front microphone input is
intended as the main microphone audio input for single
microphone applications. In FrontWave operation, a
multi−microphone signal is used to produce a directional
hearing instrument response. The two audio inputs are
buffered, sampled and converted into digital form using dual
A/D converters. The digital outputs are converted into a
32 kHz or 16 kHz, 20−bit digital audio signal.
Further IIR filter blocks process the front microphone and
rear microphone signals. One biquad filter is used to match
the rear microphone’s gain to that of the front microphone.
After that, other filtering is used to provide an adjustable
group delay to create the desired polar response pattern
during the calibration process.
In the Telecoil mode gains are trimmed during Cal/Config
process to compensate for microphone/telecoil mismatches.
The FrontWave block is followed by four cascaded biquad
filters: pre1, pre2, pre3 and pre4. These filters can be used
for frequency response shaping before the signal goes
through channel and adaptive processing.
The channel and adaptive processing consists of the
following:
• Frequency band analysis
• 1, 2 or 4 channel WDRC
• Eight logarithmically spaced band frequency shaping
(graphic EQ)
• 128 frequency band adaptive noise reduction
• Frequency band synthesis
• Phase cancellation adaptive feedback reduction
www.onsemi.com
6
6 Page VENTURE GA3219
can be ‘locked’ at manufacturing time so that it only
communicates with the library it was programmed with.
This prevents a third party from potentially upgrading a
device with a different library in IDS or other
application 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 the ARK Software
information note.
SDA Communication
Venture GA3219 is programmed via the SDA pin using
industry standard programming boxes. During parameter
changes, the main audio signal path of the hybrid is
temporarily muted using the memory switch fader to avoid
the generation of disturbing audio transients. Once the
changes are complete, the main audio path is reactivated.
Any changes made during programming are lost at
power−off unless they are explicitly burned to EEPROM
memory.
Improvements have been made to the ARK software for
Venture GA3219 resulting in increased communication
speed. Certain parameters in ARKonline can be selected to
reduce the number of pages that need to be read out.
Power Management
Venture GA3219 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. Venture GA3219 hybrids
have a separate power supply and ground connections 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.
ORDERING INFORMATION
Device
GA3219D−E1
Package
16 Pad Hybrid
Shipping†
25 Units / Bubble Pack
GA3219D−E1−T
16 Pad Hybrid
500 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 Venture GA3219 contact your Sales Account Manager or FAE and use part
number GA3280GEVB.
www.onsemi.com
12
12 Page | ||
Seiten | Gesamt 14 Seiten | |
PDF Download | [ GA3219 Schematic.PDF ] |
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