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PDF GA3284 Data sheet ( Hoja de datos )
| Número de pieza | GA3284 | |
| Descripción | Preconfigured DSP System | |
| Fabricantes | ON Semiconductor | |
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INSPIRIA GA3284
Pre-configured DSP System
for Hearing Aids
Description
INSPIRIA GA3284 is designed on the cutting-edge features and
high performance.
The Inspiria GA3284’s Adaptive Noise Reduction capability
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, Inspiria GA3284’s adaptive
feedback reduction algorithm provides increased maximum stable
gain unlike other feedback cancellation strategies. Additionally, it
features rapid adjustment for dynamic feedback situations and
resistance to tonal inputs.
The Adaptive Directional Microphone (ADM) algorithm is a
two−microphone processing scheme. It is designed to automatically
reduce the level of sound sources that originate from behind or the side
of the hearing−aid wearer without affecting sounds from the front. The
algorithm accomplishes this by adjusting the null in the microphone
polar pattern to minimize the noise level at the output of the ADM.
Features
• Advanced Research
♦ 128−band Adaptive Noise Reduction
♦ Adaptive Feedback Cancellation
♦ Adaptive Directional Microphones
• 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
• 93 dB Input Dynamic Range with HRXt Headroom Extension
• 1, 2 or 4 Channel WDRC Compression
• 12−Band Graphic EQ
• 8 Biquadratic Filters
• Drives Zero−Bias 2−Terminal Receivers
• Four Analog Inputs
• Four Fully Configurable Memories with Audible Memory Change
Indicator
• Two Memory Select Pads
• Internal or External Volume Control with Programmable Range
• AGC−O with Variable Threshold, Time Constants, and Optional
Adaptive Release
• 16 kHz or 8 kHz Bandwidth
• Optimized Programming Speed
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
GA3284−E1
XXXXXX
GA3284 = Specific Device Code
E1 = RoHS Compliant Hybrid
XXXXXX = Work Order Number
ORDERING INFORMATION
See detailed ordering and shipping information on page 13 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
August, 2015 − Rev. 6
1
Publication Order Number:
GA3284/D
1 page  
INSPIRIA GA3284
TYPICAL APPLICATIONS
Note: All resistors in ohms and all capacitors in farads, unless otherwise stated.
VB
1
Voltage
Regulator
15 A/D
3k9
3k9
1k
1k
14
2
3
16
M
U
X
A/D
MIC/
TCOIL
Comp
Programming
12 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
Cross
Fader
Volume
Control
6
POR
Circuitry
Peak
Clipper
D/A
HBridge
Post
Biquad
Filters
Wideband
Gain
Frequency
Band
Synthesis
Control
A/D
WDRC (1,2,4 channels)
Noise Reduction (128 bands)
Graphic EQ (12 bands)
EEPROM
11
* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI
** If Input Mode = 2 mic omni, directional, telecoil, rear mic only, DAI only, adaptive directional.
Figure 2. Test Circuit
VB
7
OUT
8 LP
9 Filter
10
13
200 k
1
Voltage
Regulator
15
14
M
2U
X
3
A/D
A/D
MIC/
TCOIL
Comp
16
12
Programming
Interface
Clock
Generator
54
Memory
Select
Adaptive
Directional
Microphone
or
FrontWave
*
**
Post
Biquad
Filters
Feedback
Canceller
AGCO
Tone
Generator
Cross
Fader
Volume
Control
Pre
Biquad
Filters
Frequency
Band
Analysis
128 bands
6
POR
Circuitry
Peak
Clipper
D/A
HBridge
Post
Biquad
Filters
Wide−
band
Gain
Frequency
Band
Synthesis
Control
A/D
WDRC (1,2,4 channels)
Noise Reduction (128 bands)
Graphic EQ (12 bands)
EEPROM
11
* If Input Mode = 1 mic omni, mic + telecoil, mic + DAI
** If Input Mode = 2 mic omni, directional, telecoil, rear mic only, DAI only, adaptive directional.
Figure 3. Typical Application Circuit
Knowles or
Microtronic
7 zero−bias
receiver
8
9
10
13
www.onsemi.com
5
5 Page 
INSPIRIA GA3284
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…
Table 3. DYNAMIC EXAMPLE WITH FOUR VALID MEMORIES (T = momentary switch is toggled; 0 = OPEN; 1 = HIGH)
MS2
000111000100000
MS 0 T T 0 T T 0 T T 0 0 T T T T
Memory A B C D D D C A B D B C A B C
0
T
A
Static Switch on MS and MS2
This mode uses two static switches to change memories.
Table 4 describes which memory is selected depending on
the state of the switches.
In this mode, it is possible to jump from any memory to
any other memory simply by changing the state of both
switches. If both switches are changed simultaneously, then
the transition is smooth. Otherwise, if one switch is changed
and then the other, the part transitions to an intermediate
memory before reaching the final memory. The part starts in
whatever memory the switches are selecting. If a memory is
invalid, the part defaults to memory A.
This mode is set by programming the ‘MSSMode’
parameter to ‘static’ and ‘Donly’ to ‘disabled’.
Table 4. MEMORY SELECTED IN STATIC SWITCH ON
MS and MS2 MODE; Internal Resistors Set to Pull Down
MS MS2
Memory
OPEN OPEN
A
HIGH
OPEN
B (if valid, otherwise A)
OPEN
HIGH
C (if valid, otherwise A)
HIGH
HIGH
D (if valid, otherwise A)
Static Switch on MS, Static Switch on MS2 (Jump to
Last Memory)
This mode uses two static switches to change memories.
Unlike in the previous example, this mode will switch to the
last valid memory when the static switch on MS2 is HIGH.
This means that this mode will only use a maximum of three
memories (even if four valid memories are programmed).
Table 5 describes which memory is selected depending on
the state of the switches.
This mode is set by programming the ‘MSSMode’
parameter to ‘static’ and ‘Donly’ to ‘enabled’.
Table 5. MEMORY SELECTED IN STATIC SWITCH ON
MS, Static Switch on MS2 (Jump to Last Memory)
Mode; Internal Resistors Set to Pull Down
MS MS2
Memory
OPEN OPEN
A
HIGH
OPEN
B (if valid, otherwise A)
OPEN
HIGH
D
HIGH
HIGH
D
In this mode, it is possible to jump from any memory to
any other memory simply by changing the state of both
switches. If both switches are changed simultaneously, then
the transition is smooth. Otherwise, if one switch is changed
and then the other, the part transitions to an intermediate
memory before reaching the final memory.
When MS2 is set HIGH, the state of the switch on MS is
ignored. This prevents memory select beeps from occurring
if switching MS when MS2 is HIGH. The part starts in
whatever memory the switches are selecting. If a memory is
invalid, the part defaults to memory A.
Audible Memory Change Indicator
The Inspiria GA3284 can be programmed to produce
tones to indicate a memory change. Using the Interactive
Data Sheet, the Inspiria GA3284 can be configured to either
enable or disable the Memory Change Indicator.
When the Memory Change Indicator is enabled, there is
an option to have a single beep for each memory change or
to have multiple beeps.
The amplitude and frequency of the memory change tone
can be selected independently from the Tone Generator
settings and can be individually selected for each memory.
When the memory change multiple beep is enabled, and the
memory change tone is enabled, then during a memory
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11
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| PDF Descargar | [ Datasheet GA3284.PDF ] | |
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