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PDF SA3229 Data sheet ( Hoja de datos )
| Número de pieza | SA3229 | |
| Descripción | Preconfigured DSP System | |
| Fabricantes | ON Semiconductor | |
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RHYTHM SA3229
Preconfigured DSP System
for Hearings Aids
Description
The RHYTHMt SA3229 hybrid from ON Semiconductor is
a trimmer−configurable DSP system based on a four−channel
compression circuit featuring a feedback cancellation algorithm.
Based on a phase cancellation method, SA3229’s adaptive feedback
reduction algorithm provides added stable gain to enable extra gain
and user comfort. It features rapid adjustment for dynamic feedback
situations and resistance to tonal inputs.
In addition to these adaptive algorithms, SA3229 also supports the
following features: up to four channel WDRC, low−distortion
compression limiting, cross fading between audio paths for click−free
memory changes, eight−band graphic equalizer, eight configurable
generic biquad filters, programming speed enhancements, in−channel
squelch to attenuate microphone and circuit noise in quiet
environments, optional peak clipping, flexible compression
adjustments, volume control, rocker switch, noise generation for
Tinnitus treatment, and industry−leading security features to avoid
cloning and software piracy.
A trimmer interface supports manual circuit configuration. It
continuously monitors trimmer positions and translates them into
the hearing−aid parameters of choice. A Serial Data or I2C Interface
provides full programmability at the factory and in the field.
RHYTHM SA3229 is a single−chip hybrid with a one−time
programmable (OTP) memory intended for low cost applications
requiring high gain.
Features
• Adaptive Feedback Cancellation
• WDRC Compression with Choice of 1, 2 or 4 Channels of
Compression
• Auto Telecoil with Programmable Delay
• EVOKE LITEt Acoustic Indicators
• Noise Generator for Tinnitus Treatment or In−Situ Audiometry
• Frequency Response Shaping with Graphic EQ
• Trimmer Compatibility – Four Three−Terminal Trimmers with
Configurable Assignments of Control Parameters
• I2C and SDA Programming
• Rocker Switch Support for Memory Change and/or Volume Control
Adjustment
• Support for Active High or Active Low Switching
• Analog or Digital Volume Control with Programmable Range
• High Quality 20−bit Audio Processing
• High Power/High Gain Capability
• Configurable Low Battery Indicator
www.onsemi.com
SIP25
HYBRID
CASE 127DZ
PAD CONNECTION
VIN2 17
TIN 16
DAI 15
VC 14
D_VC 13
SDA 12
CLK 11
18
VIN1
19
TR4
20
TR3
21
TR2
22
TR1
23
N/C
25 24
1 VREG
2 MGND
3 GND
4 PGND
5 OUT+
6 OUT−
7 VBP
MS1 10
9
8
MS2
(Bottom View)
VB
MARKING DIAGRAM
SA3229−E1
XXXXXX
SA3229 = 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, 2016
May, 2016 − Rev. 0
1
Publication Order Number:
SA3229/D
1 page  
RHYTHM SA3229
Table 3. I2C TIMING
Standard Mode
Fast Mode
Parameter
Symbol
Min
Max
Min
Max Units
Clock Frequency
fPC_CLK
0
100
0
400 kHz
Hold time (repeated) START condition. After this
tHD;STA
4.0
−
0.6
− msec
period, the first clock pulse is generated.
LOW Period of the PC_CLK Clock
HIGH Period of the PC_CLK Clock
Set−up time for a repeated START condition
Data Hold Time:
for CBUS Compatible Masters
for I2C−bus Devices
tLOW
tHIGH
tSU;STA
tHD;DAT
4.7
4.0
4.7
5.0
0
(Note 1)
−
−
−
−
3.4
(Note 2)
−
−
−
−
0
(Note 1)
−
−
−
−
0.9
(Note 2)
msec
msec
msec
msec
Data set−up time
Rise time of both PC_SDA and PC_CLK signals
tSU;DAT
tr
250
−
−
1000
100
20 + 0.1 Cb
(Note 4)
−
300
nsec
nsec
Fall time of both PC_SDA and PC_CLK signals
tf
−
300 20 + 0.1 Cb 300
nsec
(Note 4)
Set−up time for STOP condition
Bus free time between a STOP and START condition
Output fall time from VIHmin to VILmax with a bus
capacitance from 10 pF to 400 pF
tSU;STO
tBUF
tof
4.0
4.7
−
− 0.6 −
− 1.3 −
250 20 + 0.1 Cb 250
(Note 4)
nsec
msec
nsec
Pulse width of spikes which must be suppressed by
tSP
n/a
n/a
0
50 nsec
the input filter
Capacitive load for each bus line
Cb − 400 − 400 pF
1. A device must internally provide a hold time of at least 300 ns for the PC_SDA signal to bridge the undefined region of the falling edge of PC_CLK.
2. The maximum tHD;DAT has only to be met if the device does not stretch the LOW period (tLOW) of the PC_CLK signal.
3. A Fast−mode I2C−bus device can be used in a Standard−mode I2C−bus system, but the requirement tSU;DAT P250ns must then be met.
This will automatically be the case if the device does not stretch the LOW period of the PC_CLK signal. If such a device does stretch the
LOW period of the PC_CLK signal, it must output the next data bit to the PC_SDA line tr max + tSU;DAT = 1000 + 250 = 1250 ns (according
to the Standard−mode I2C−bus specification) before the PC_CLK line is released.
4. Cb = total capacitance of one bus line in pF.
www.onsemi.com
5
5 Page 
RHYTHM SA3229
In Momentary Memory Select mode, the rocker switch
allows cycling through the memory profiles in both
directions. An “up” switch closure indicates a program
advance to the next higher numbered memory and “down”
switch closures indicates a program retreat to the next lower
numbered memory. In this mode, volume control is only
available through software control.
In Mixed Mode, operation of the switch as a volume
control or memory select is governed by the time duration
of the switch closure: either short or long. The
discrimination of short and long pulses is set by
a programmable, time−threshold value, from 1 s to 5 s in 1 s
increments. An additional programmable parameter
determines whether the short pulses refer to volume−control
operation or memory−select operation.
If long pulses control memory select operation, the
memory change is initiated once the switch is held for the
long pulse period without requiring the switch to be
released. In Digital VC mode or Momentary Memory Select
mode, the action takes place after the switch is released.
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 module has its own level detector, with
programmable attack and release time constants.
Graphic Equalizer
SA3229 has a 8−band graphic equalizer. Each band
provides up to 24 dB of gain adjustment in 1 dB increments.
Biquadratic Filters
Additional frequency shaping can be achieved by
configuring generic biquad filters. The transfer function for
each of the biquad filters is as follows:
H(z)
+
b0 ) b1
1 ) a1
z*1 ) b2
z*1 ) a2
z*2
z*2
NOTE:
The a0 coefficient is hard−wired to always be
‘1’. The coefficients are each 16 bits in length
and formatted as one sign bit, one integer bit and
14 fractional bits. This maps onto a decimal
range of −2.0 to 2.0 before quantization (−32767
to 32767 after quantization).
Thus, before quantization, the floating−point coefficients
must be in the range −2.0 ≤ x < 2.0 and quantized with the
function:
round(x 214)
After designing a filter, the quantized coefficients can be
entered into the PreBiquads or PostBiquads tab in the
Interactive Data Sheet. The coefficients b0, b1, b2, a1, and
a2 are as defined in the transfer function above. The
parameters meta0 and meta1 do not have any effect on the
signal processing, but can be used to store additional
information related to the associated biquad.
The underlying code in the product components
automatically checks all of the filters in the system for
stability (i.e., the poles have to be within the unit circle)
before updating the graphs on the screen or programming
the coefficients into the hybrid. If the Interactive Data Sheet
receives an exception from the underlying stability checking
code, it automatically disables the biquad being modified
and displays a warning message. When the filter is made
stable again, it can be re−enabled.
Also note that in some configurations, some of these
filters may be used by the product component for
microphone/telecoil compensation, low−frequency EQ, etc.
If this is the case, the coefficients entered by the user into
IDS are ignored and the filter designed by the software is
programmed instead. For more information on filter design
refer to the Biquad Filters In PARAGON Digital Hybrid
information note.
Tinnitus Treatment Noise
The Tinnitus Treatment noise is generated using white
noise generator hardware and shaping the generated noise
using four 2nd order biquadratic filters. The filter parameters
are the same coefficients as those presented in the
Biquadratic Filters section.
The Tinnitus Treatment noise can be added into the signal
path at two possible locations: before the VC (before the
AGC−O, but compensated for the Wideband Gain) or after
the VC (between the last generic biquad and the Cross
Fader).
If the noise is injected before the VC then the level of the
noise will change along with the rest of the audio through the
device when the VC is adjusted. If the noise is injected after
the VC it is not affected by VC changes.
EVOKE Lite Acoustic Indicators
Ten Acoustic Indicators are available for indicating
events. Each indicator is fixed to a particular event. Any
event can have its assigned indicator enabled or disabled
although not always independently. Individual enable/
disable control is provided for the following event or group
of events:
• Power on reset (POR)
• Four memory selects
• Volume Up and Volume Down
• Volume Max and Volume Min
• Low Battery
Each Acoustic Indicator is made up of up to four faded
tones. A faded tone exhibits a 64 ms fade−in and fade−out
transition time. The duration of an Acoustic Indicator is
configurable, with a maximum value of 6.35 seconds.
Power Management
SA3229 has three user−selectable power management
schemes to ensure the hearing aid dies gracefully at the end
of battery life. Shallow reset, Deep reset and Advanced
www.onsemi.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SA3229.PDF ] | |
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