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PDF R3110 Data sheet ( Hoja de datos )
| Número de pieza | R3110 | |
| Descripción | Pre-fit DSP Solution | |
| Fabricantes | ON Semiconductor | |
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RHYTHM R3110
Pre-fit DSP Solution for
Hearing Aids
Introduction
The RHYTHMt R3110 hybrid from ON Semiconductor is a
pre−fit DSP system that is based on a two−channel compression circuit
and designed for entry level hearing aids. With no need for software
configuration nor that of storing audiology parameters via computer
fitting, R3110 is a simple, cost−effective solution with many features
found in high−end hearing aids, including Adaptive Noise Reduction
and Adaptive Feedback Cancellation. R3110 is targeted at replacing
aging analog solutions; it offers the same ease of use, yet provides the
superior performance of digital technology. In its simplest
configuration, a hearing aid build using R3110 only requires four
external electronic components.
Key Features and Benefits
• Pre−Fit Audiology Parameters− All sound−processing algorithms
are preprogrammed to enable manufacturers to develop hearing aids
in a variety of form−factors and to fit a wide range of hearing loss
profiles. The device can also be configured for additional use−cases
through hardware settings.
• Trimmer−Based Fitting− Up to four trimmers can be deployed,
offering manufacturers the capability to modify most parameters that
are important for patient fitting.
• Mode Control− Provides a variety of user control options:
momentary or static switches, as well as an analog volume control.
• Adaptive Feedback Canceller− Automatically reduces acoustic
feedback. It allows for an increase in stable gain while minimizing
artifacts for music and tonal input signals
• Automatic Telecoil Support− Supports the use of telecoil devices,
enabled either automatically with a magnetic sensitive switch or via
an external switch
• Adaptive Noise Reduction− The adaptive noise reduction algorithm
monitors signal and noise activities in 32 individual bands and
carefully reduces noise
• Tinnitus Masking− A noise source can be enabled to mask tinnitus.
The noise level is adjustable and mixed with the audio path. Spectral
shaping is also possible using the high−cut and low−cut filters.
www.onsemi.com
21−PAD HYBRID
CASE 127DF
PIN NUMBERING
15 16
14 17
13 18
12 19
11 20
10 21
98
1
2
3
4
5
6
7
(Bottom View)
MARKING DIAGRAM
R3110−CBAA
######
R3110−CBAA = Specific Device Code
## = Work Order Number
ORDERING INFORMATION
See detailed ordering and shipping information on page 13 of
this data sheet.
© Semiconductor Components Industries, LLC, 2015
February, 2015 − Rev. 1
1
Publication Order Number:
R3110/D
1 page  
RHYTHM R3110
TYPICAL APPLICATION
RCVR
MIC MGND GND PGND OUT+ OUT− VBP
MIC 1 2 3 4 5 6 7
TC−IN N/C LC
HC N/C TN−EN VB
16 17 18 19 20 21
8
VREG
AGCO
15 14
WG/
NL
13
VC
12
N/C TC−EN
11 10
MS
9
VC POT
VREG
15
MIC
1
TC−IN
16
MGND
2
TC−EN MS
10 9
Mode
Control
+−
A/D
+
A/D
VC AGCO
12 14
LC HC
18 19
Feedback
Cancellation
VB
8
R3110
VBP
7
Two−
Channel
WDRC
&
Noise
Reduction
+
+
Gain
Controls
+
+
Filtering
H−Bridge
OUT+
5
6
OUT−
Acoustic
Indicators
Tinnitus
Noise
Generation
13 21
WG/NL TN−EN
3
GND
4
PGND
Figure 2. A typical hearing device with R3110: Reference Schematic and Wiring Diagram
+
−
www.onsemi.com
5
5 Page 
RHYTHM R3110
Noise Generator for Tinnitus Treatment
R3110 offers a dedicated pin to control the Tinnitus
Treatment noise generation algorithm: TN−EN. This pin has
an internal pull−down resistor to ground (GND), which
disables the algorithm by default. When activated (pulled to
VB), Tinnitus Treatment is generated deploying
amplitude−scaled white noise, depending on adjustments
made via pin WB/NL. When the TN−EN pin is set high
(connected to VB) to enable the tinnitus algorithm, the
WB/NL pin controls the generated noise level (NL) as per
Table 4. The noise is injected into the audio path, as shown
in the block diagram of Figure 1 and the entire audio signal
is shaped using the internal filters controlled by the LC and
HC pins. The VC pin and, consequently the amount of
attenuation that it selects, only affects the audio signal and
not the tinnitus noise level. The tinnitus mode can be used
in conjunction with all three modes (Simples, Advanced and
Telecoil). In this configuration, it will control the tinnitus
noise level instead.
Using the R3110 Solely as a Tinnitus Masker Device:
R3110 can also be used as a tinnitus only device with no
microphones at all, only one receiver. In this configuration
all inputs will be connected to MGND (MIC and TC−IN).
Push Button Support
R3110 supports the use of momentary switches via the
Mode Select (MS) pin (#9). It allows rotating between the
three input modes (Simple, Advanced and Telecoil) as
defined earlier, this in a sequential manner. A momentary
switch needs to connect the MS pin (#9) to the VB pin (#8)
to enable this functionality. R3110 will switch from Simple
to Advanced Mode, then Telecoil, and then back to Simple,
each time the momentary switch is pushed. When this
function is not desired in the end product, the hearing aid, the
MS pin can be left floating.
Acoustic Indicators
In the configurations outlined both in the Telecoil Support
and in the Push Button Support sections, whenever R3110
transitions between modes, the audio path is temporarily
faded−out and an acoustic indicated is played. R3110 has
preconfigured acoustic indicators to notify the user of the
following events:
• Device startup
♦ Four sequential tones with the following audio
frequencies: A4 (440 Hz), F4 (349 Hz), G4
(392 Hz), C4 (262 Hz)
• MS pin: mode switches with momentary push button
♦ Simple mode: one tone at the C5 audio frequency
(523 Hz)
♦ Advanced mode: two sequential tones with
increasing audio frequencies G4 (392 Hz) and C5
(523 Hz), 250 ms duration and 50 ms silence
between the tones.
♦ Telecoil mode: three faded tones with increasing
audio frequencies E4 (330 Hz), G4 (392 Hz) and C5
(523 Hz).
• TC−EN pin : telecoil mode enabled
♦ Four sequential tones with increasing audio
frequencies C4 (262 Hz), E4 (330 Hz), G4 (392 Hz)
and C5 (523 Hz).
• Low battery
♦ Three sequential tones with decreasing audio
frequencies G4 (392 Hz), E4 (330 Hz) and C4
(262 Hz).
All tones exhibit a nominal 32 ms fade−in and fade−out
transition time. The duration of all the tones is 250 ms, and
the silence duration between tones is 50 ms. The level of the
tones is input referred and determined dynamically by
R3110 based on the input signal level as well as the volume
control.
Power Management and Low Battery Warning
As the voltage on the hearing aid battery decreases under
1.1 V, an audible warning signal is given to the user
indicating that the battery life is low. This indicator is
repeated every five minutes until the battery voltage is
further decreased under 0.88 V, at which point the device
shuts down. In addition to this audible warning and before
shut down, the hearing aid applies a sophisticated power
management scheme to ensure proper operation given the
weak battery supply and to maximize the device’s usable
battery life by reducing the gain to stabilize the supply based
on the instantaneous and average supply voltage levels.
Evaluation Environment and Hybrid Jig
The performances of R3110 can be evaluated by using the
hybrid jig evaluation board. As can be seen on Figure 1, a
number of evaluation features have been designed on the
hybrid jig, such as input and output audio connectors, output
amplification circuitry, microphone headers, push buttons,
toggle switches, analog potentiometers, a USB connection
as well as a wealth of other useful features that will allow
easy evaluation of the R3110 hybrid.
Figure 7. Hybrid Jig
www.onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet R3110.PDF ] | |
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