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PDF GA3285 Data sheet ( Hoja de datos )
| Número de pieza | GA3285 | |
| Descripción | Preconfigured DSP System | |
| Fabricantes | ON Semiconductor | |
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INSPIRIA GA3285
Pre-configured DSP System
for Hearing Aids
Description
The INSPIRIA GA3285 is ON Semiconductor’s premiere DSP
product designed on an advanced hardware platform. Combining the
power and capabilities of the hardware platform together with
Advanced Research, the Inspiria GA3285 delivers cutting−edge
features and high performance.
The hardware platform is ON Semiconductor’s industry−leading
programmable digital signal processing platform. Advanced
Research, developed by ON Semiconductor, is a methodology that
couples state−of−the−art acoustic algorithms to ensure high−fidelity
digital sound quality.
The Inspiria GA3285 iLogt Datalogging feature records various
parameters every 15 minutes during use of the device. Once these
parameter values are read from the device, they can be used to counsel
the user and fine tune the fitting.
The Inspiria GA3285’s Adaptive Noise Reduction monitors noise
levels independently in 128 individual bands and employs advanced
psychoacoustic models to provide user comfort.
Based on a phase cancellation method, Inspiria GA3285’s adaptive
feedback reduction algorithm provides an increase in added stable
gain. It features rapid adjustment for dynamic feedback situations and
resistance to tonal inputs.
ON Semiconductor’s Automatic Adaptive Directional Microphone
(ADM) algorithm is a two−microphone processing scheme. The
algorithm automatically reduces the level of sound sources that
originate from behind or the side of the hearing−aid wearer without
affecting sounds from the front by adjusting the null in the microphone
polar pattern to minimize the noise level at the output of the ADM. To
reduce current consumption, the algorithm can switch automatically
between 1 mic omni and ADM depending on the acoustic
environment.
The Inspiria GA3285 is equipped with a noise source that can be
used in treating tinnitus. The Tinnitus Treatment noise can be shaped
and attenuated and then summed into the audio path either before or
after the volume control.
The Narrow−band Noise Stimulus feature allows the user to
generate stimuli from the device that can be used for in situ
audiometry.
In addition to these adaptive algorithms, the Inspiria GA3285 also
supports the following features: up to 8 channel WDRC,
FRONTWAVE® directional processing, cross fading between audio
paths for click−free memory changes, 16−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, volume control, and industry−leading
security features to avoid cloning and software piracy.
www.onsemi.com
16 PAD
HYBRID
CASE TBD
FMIC
RMIC
VC
SDA
GND
PGND
PAD CONNECTION
MGND
15 16
1
14 2
13 3
12
4
11
5
10
6
98
7
OUT+ OUT−
(Bottom View)
VREG
TIN
DAI
MS
MS2
VB
VBP
MARKING DIAGRAM
GA3285A−E1
XXXXXX
GA3285A = Specific Device Code
E1 = RoHS Compliant Hybrid
XXXXXX = Work Order Number
ORDERING INFORMATION
See detailed ordering and shipping information on page 14 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
August, 2015 − Rev 3
1
Publication Order Number:
GA3285/D
1 page  
INSPIRIA GA3285
TYPICAL APPLICATIONS
VB
1
Voltage
Regulator
15 A/D
3k9
3k9
1k
1k
14
2
3
16
M
U
X
A/D
MIC/
TCOIL
Comp
12
Programming
Interface
Clock
Generator
54
Memory
Select
Adaptive
Directional
Microphone
or
FrontWave
*
**
Post
Biquad
Filters
Feedback
Canceller
AGCO
Pre
Biquad
Filters
Frequency
Band
Analysis
128 bands
Tone
Generator
6
POR
Circuitry
Σ Cross
Peak
D/A
Fader
Clipper
HBridge
Noise Generator
and Shaper
7
8
9
10
OUT
LP
Filter
Volume
Control
Σ
Wide−
band
Gain
Post
Biquad
Filters
Frequency
Band
Synthesis
Control
A/D
200 k
13
Data
Logging
WDRC (1,2,4,6 or 8 channels)
Noise Reduction (128 bands)
Graphic EQ (16 bands)
EEPROM
* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI
11
** If Input Mode = 2 mic omni, rear only, directional
Note: All resistors in ohms and all capacitors in farads, unless otherwise stated.
Figure 2. Test Circuit
VB
1
Voltage
Regulator
15
14
M
2U
X
3
A/D
A/D
MIC/
TCOIL
Comp
16
12
Programming
Interface
Clock
Generator
54
6
Memory
Select
Adaptive
Directional
Microphone
or
FrontWave
*
**
Post
Biquad
Filters
Feedback
Canceller
AGCO
Tone
Generator
S Cross
Fader
POR
Circuitry
Peak
Clipper
D/A
HBridge
Noise Generator
and Shaper
Volume
Control
S
Wide−
band
Gain
Control
A/D
Pre
Biquad
Filters
Environmental
Classification
Post
Biquad
Filters
Knowles or
Microtronic
7 zero−bias
receiver
8
9
10
13
Frequency
Band
Analysis
128 bands
Frequency
Band
Synthesis
Data
Logging
WDRC (1,2,4,6 or 8 channels)
Noise Reduction (128 bands)
Graphic EQ (16 bands)
EEPROM
* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI
11
** If Input Mode = 2 mic omni, rear only, directional
Note: All resistors in ohms and all capacitors in farads, unless otherwise stated.
Figure 3. Typical Application Circuit
www.onsemi.com
5
5 Page 
INSPIRIA GA3285
If using a two−terminal VC, it must be calibrated before
use. Calibration is not necessary with a three−terminal
connection. Hysteresis is built into the VC circuitry to
prevent unintentional volume level toggling. A log taper
potentiometer is recommended so that gain in dB would be
linear with potentiometer rotation. The range of VC is
adjustable and can be set between 1 dB (min) and 42 dB
(max).
Digital Volume Control
If using a Digital Volume Control with the Inspiria
GA3285, a resistor must be connected between the VC input
and Vreg, and another resistor of the same value must be
connected between the VC input and GND. The values of
both resistors can be between 50 kW and 0.5 MW.
A toggle switch can be used as a DVC, momentarily
connecting the VC to either Vreg or GND. By connecting the
VC to Vreg, the volume will be increased one step, and by
connecting the VC to GND, the volume will be decreased
one step.
The following parameters can be programmed into the
hybrid to specify the DVC functionality:
• DVC enable or disable
• Volume up/down step size of 1 dB, 2 dB, 3 dB or 4 dB
• Volume up/down beep frequency and volume
• DVC range between 6 dB and 42 dB in 6 dB steps
• Default DVC value when the hybrid is powered up
• Volume up/down beep enable
• Max/Min beep enable
• Max/Min beep frequency & volume
If the Max/Min beep is enabled then when the volume has
been incremented to the maximum value of the specified
DVC range the device will play two beeps to indicate that it
cannot increase the volume any more. The same is true for
decrementing the volume and reaching the minimum value
of the DVC range.
AGC−O and Peak Clipper
The output compression−limiting block (AGC−O) is an
output limiting circuit whose compression ratio is fixed at
∝:1. The threshold level is programmable. The AGC−O
module has programmable attack and release time
constants.
The AGC−O on the Inspiria GA3285 has optional
adaptive release functionality. When this function is
enabled, the release time varies depending on the
environment. In general terms, the release time becomes
faster in environments where the average level is well below
the threshold and only brief intermittent transients exceed
the threshold.
Conversely, in environments where the average level is
close to the AGC−O threshold, the release time applied to
portions of the signal exceeding the threshold is longer. The
result is an effective low distortion output limiter that clamps
down very quickly on momentary transients but reacts more
smoothly in loud environments to minimize compression
pumping artifacts. The programmed release time is the
longest release time applied, while the fastest release time is
16 times faster. For example, if a release time of 128 ms is
selected, the fastest release time applied by the AGC−O
block is 8 ms.
The Inspiria GA3285 also includes the Peak Clipper block
for added flexibility.
Memory Select Switches
One or two, two−pole Memory Select (MS) switches can
be used with the Inspiria GA3285. This enables users
tremendous flexibility in switching between configurations.
These switches may be either momentary or static and are
configurable to be either pull−up or pull−down through the
settings tab in IDS.
Up to four memories can be configured on the Inspiria
GA3285. Memory A must always be valid. All memory
select options are selectable via the settings tab in IDS.
Momentary Switch on MS
This mode uses a single momentary switch on MS (Pin 4)
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.
This mode is set by programming the ‘MSSMode’
parameter to ‘Momentary’ and ‘Donly’ to ‘disabled’.
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 5) and
a momentary switch on MS (Pin 4) to change memories. If
the static switch is OPEN, the part starts in memory A and
behaves like momentary, with the exception that memory D
is not used. If the static switch on MS2 is set to HIGH, the
part automatically jumps to memory D (occurs on start−up
or during normal operation). In this setup, the momentary
switch’s state is ignored, preventing memory select beeps
from occurring. When MS2 is set to OPEN, the part loads in
the last select memory.
This mode is set by programming the ‘MSSMode’
parameter to ‘Momentary’ and ‘Donly’ to ‘enabled’.
Example:
If MS2 = OPEN and there are 4 valid memories:
ABCABCA…
If MS2 = OPEN and there are 3 valid memories: ABABA…
If MS2 = HIGH: D…
www.onsemi.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet GA3285.PDF ] | |
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