DUET™ DIGITAL
Advanced DSP System
with FRONTWAVE®
GB3212 PRELIMINARY DATA SHEET
DESCRIPTION
• 4-channel WDRC compression
DUET™ DIGITAL is a high end DSP system with advanced
adaptive algorithms. The signal processing algorithms run
on a hardware platform which is a combination of a highfidelity CODEC and a general purpose DSP core.
Algorithms developed and optimized by Gennum, running
on this powerful platform, offer true speech processing. The
reflowable thinSTAX™ packaging enables easy integration
into a wide range of applications, from CIC to BTE.
• 16-band frequency shaping
• 16-band adaptive noise reduction
• adaptive feedback cancellation
• FRONTWAVE® directional processing
• high fidelity CODEC – dual A/D’s;D/A
• 16-bit DSP core processor
As shown in the block diagram below, some of the audio
DSP functions are implemented in hardware as a part of our
high fidelity CODEC while other adaptive algorithms such
as Noise Reduction and Feedback Cancellation use the
• 95dB input dynamic range with HRX™ Headroom
Extension
• drives zero-bias 2-terminal receivers
• thinSTAX™ packaging
DSP core. Pre-processing blocks include FRONTWAVE®
directional processing and programmable filters. Postprocessing blocks include tone generation, volume control,
AGCo and programmable filters.
• 4 fully configurable memories with audible memory
change indicator
• 2 memory select pads
• internal/external volume control
The GB3212 hybrid code programmed into the EEPROM is
“40”.
• AGCo with variable threshold and time constants
This data sheet is part of a set of documents available for
this product. Please refer to Getting Started with DUET™
DIGITAL, Document #29231 for a list of other documents.
thinSTAX™ PACKAGING
Hybrid typical dimensions:
0.217 x 0.129 x 0.087in.
(5.51 x 3.28 x 2.21mm)
VB
VC
5
3
10n
CODEC
VREG
REGULATOR
14
50n
VC
A/D
TONE
GENERATOR
FMIC
A/D
15
6
VBP
8
OUT-
7
OUT+
9
PGND
70n
FRONTWAVE
BIQUAD
FILTERS
BIQUAD
FILTERS
Σ
BIQUAD
FILTERS
AGC-O
D/A
HBRIDGE
70n
RMIC
16
T
2
A/D
60n
MGND
1
EEPROM
Adaptive
Feedback
Cancellation
band 1
band 16
Frequency
Band
Analysis
Frequency
Band
Synthesis
WDRC
4 channels
Frequency Shaping
16 bands
Noise Reduction
16 bands
DSP
10
13
11
12
17
4
GND
MS1
N/A
N/A
MS2
SDA
BLOCK DIAGRAM
Doc.No. 20352 - 2 [Rev. July 2004]
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GB3212
FEATURES
ABSOLUTE MAXIMUM RATINGS
PAD CONNECTION
PARAMETER
VALUE/UNITS
Operating Temperature Range
-10°C to 40°C
Storage Temperature Range
-20°C to 70°C
OUT-
Absolute Maximum Power Dissipation
PGND
GND
N/A
N/A
9
10
11
12
8
17
25mW
1.5VDC
Absolute Maximum Supply Voltage
OUT+
VREG
13
14
MS2
7
15
FMIC
16
RMIC
2VDC
6
5
4
3
2
VBP
VB
SDA
VC
1
T
CAUTION
CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
LEVEL 3 MOISTURE
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
DO NOT OPEN PACKAGES EXCEPT UNDER
CONTROLLED CONDITIONS
MGND
ELECTRICAL CHARACTERISTICS
Conditions: Supply Voltage VB = 1.3V; Temperature = 25°C
PARAMETER
MIN
TYP
MAX
UNITS
-
1.1
-
mA
0.94
0.97
1.0
V
-
1.10
-
V
Low Frequency System Bandwidth
-
125
-
Hz
High Frequency System Bandwidth
-
8
-
kHz
Hybrid Current
SYMBOL
ΙAMP
CONDITIONS
All adaptive features enabled.
Minimum Operating Supply Voltage
VBOFF
Ramp down
Supply Voltage Turn On Threshold
VBON
Ramp up
Converter Gain
ACONV
A/D + D/A gain.
-
29
-
dB
Total Harmonic Distortion
THD
VIN = -40 dBV
-
-
1
%
THD at Maximum Input
THDM
VIN = -15 dBV, HRX - ON
-
-
3
%
1.945
2.048
2.15
MHz
-
-
-106
dBV
-
16
-
kΩ
-
80
-
dB
-
-15
-
dBV
Clock Frequency
ƒclk
INPUT
Input Referred Noise
IRN
Input Impedance
ZIN
Anti-alias Filter Rejection
Bandwidth 100Hz - 8kHz
ƒ=ƒclk-8kHz,
VIN = -40dBV
(input referred)
Maximum Input Level
Input Dynamic Range
HRX - ON, Bandwidth 100Hz - 8kHz
-
95
-
dB
A/D Dynamic Range
Bandwidth 100Hz - 8kHz
-
86
-
dB
Maximum RMS Output Voltage
0dBFS ƒ = 1kHz
-
-1
-
dBV
D/A Dynamic Range
Bandwidth 100Hz - 8kHz
-
83
-
dB
OUTPUT
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GB3212
Maximum Operating Supply Voltage
MS1
ELECTRICAL CHARACTERISTICS
(CONTINUED)
Conditions: Supply Voltage VB = 1.3V; Temperature = 25°C
PARAMETER
RANGE
UNITS
MIN
MAX
Time Delay
0.1
50
ms
Low Frequency Equalizer Corner Frequency
0.05
8
kHz
FRONTWAVE
®
GB3212
FREQUENCY SHAPING
Pre1 and Pre2 Biquad Filter
Design Specific
N/A
PostA and PostB Biquad Filter
Design Specific
N/A
Graphic EQ Band Gain
-42
0
dB
Lower Threshold
-100
-30
dBFS
Upper Threshold
-90
-20
dBFS
Low Level Gain
-18
42
dB
High Level Gain
-18
42
dB
Compression Ratio
1:1
100:1
Ratio
WIDE DYNAMIC RANGE COMPRESSION
Fast Detector Time Constant
4
8188
ms
Slow Detector Time Constant
4
8188
ms
-40
0
dBFS*
AGCo
AGCo Output Limiting
∞:1
AGCo Compression Ratio
Ratio
AGCo Attack Time Constant
0.25
8192
ms
AGCo Release Time Constant
0.25
8192
ms
Wideband System Gain
-36
12
dB
External Volume Control
-48
0
dB
Internal Volume Control Attenuator
-48
0
dB
WIDEBAND SYSTEM GAIN
* peak output is defined as largest sine wave possible at the resonant frequency of the receiver
SUPPORT SOFTWARE
All support software for the GB3212 is available from the
Gennum Web site,
http://www.gennum.com/hip/software/index.html.
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VB
200k
5
3
10n
CODEC
REGULATOR
14
50n
VC
A/D
TONE
GENERATOR
70n
3k9
OUT
FRONTWAVE
BIQUAD
FILTERS
BIQUAD
FILTERS
Σ
BIQUAD
FILTERS
AGC-O
8
D/A
HBRIDGE
LP FILTER
7
70n
16
3k9
GB3212
6
A/D
15
A/D
9
2
60n
1k
EEPROM
Adaptive
Feedback
Cancellation
1
band 1
band 16
Frequency
Band
Analysis
Frequency
Band
Synthesis
WDRC
4 channels
Frequency Shaping
16 bands
Noise Reduction
16 bands
DSP
10
13
12
11
4
17
All resistors in ohms, all capacitors in farads unless otherwise stated.
Figure 1: Test circuit
VB
5
3
10n
CODEC
REGULATOR
14
50n
VC
A/D
TONE
GENERATOR
6
A/D
15
70n
FRONTWAVE
BIQUAD
FILTERS
BIQUAD
FILTERS
Σ
BIQUAD
FILTERS
AGC-O
D/A
HBRIDGE
70n
16
8
7
Knowles or Microtronic
zero-bias receiver
A/D
9
2
60n
EEPROM
Adaptive
Feedback
Cancellation
1
band 1
band 16
Frequency
Band
Analysis
Frequency
Band
Synthesis
WDRC
4 channels
Frequency Shaping
16 bands
Noise Reduction
16 bands
DSP
10
13
12
11
17
4
All resistors in ohms, all capacitors in farads unless otherwise stated.
Figure 2: Typical application circuit
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VC
MS
switch
(N.O.)
+
Rear
Mic
GB3212
Zero Biased
Receiver
+
Front
Mic
+
-
CS44
T-coil
Figure 3: Assembly diagram
INTRODUCTION
The GB3212 hybrid comprises a highly versatile, advanced
digital signal processing system.
Configuration data stored in non-volatile memory defines
hearing aid parameters. This data needs to be uploaded to
the hybrid before the circuit becomes functional. The
GB3212 hybrid is programmed via the SDA pin using
industry-standard programming boxes.
Configuration data is generated by an ARK product
component library (DLL). Like Gennum's other digital
products, the GB3212 is fully supported by Gennum's
software tools available from the Gennum ARK web site
http://ark.gennum.com.
SIGNAL PATH
There are two main audio input signal paths. The first path
contains the Front Microphone and second path contains
the Rear Microphone or Telecoil 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
multimicrophone 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 32kHz, 20-bit digital audio signal.
Further IIR filter blocks process the front microphone and
rear microphone signals. Two biquad filters, "miccomp1"
and "miccomp2", are used to match the rear microphone's
gain and phase to that of the front microphone. After the
miccomp filters, more filters are 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 two cascaded
biquad filters, "pre1" and "pre2". These filters can be used
for frequency response shaping before the signal goes from
the CODEC chip into the DSP chip. When FRONTWAVE® is
not enabled, the miccomp filters can be used for frequency
response shaping also.
After passing through the biquad filters the signal enters the
DSP chip. At this point, the signal is converted to 16kHz
and 16-bit. The DSP chip runs the following signal
processing algorithms:
•
frequency analysis
•
4 channel WDRC
•
16 band frequency shaping
•
16 band noise reduction
•
frequency band synthesis
•
adaptive feedback cancellation
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Once the signal has been processed by the DSP chip it
goes back into the CODEC chip. On the CODEC chip there
are four more cascaded biquad filters — "post1", "post2",
"post3" and "post4". These biquad filters are followed by the
tone generator, AGCo block and two more biquad filters —
"postagco1" and "postagco2". The last stage is in the signal
path is the D/A H-bridge.
The system's two A/D converters are 2nd-order sigma-delta
modulators, which operate at a 2.048MHz sample rate. The
system's two audio inputs are pre-conditioned with antialias
filtering and programmable gain pre-amplifiers. These
analog outputs are over sampled and modulated to
produce two, 1-bit pulse density modulated (PDM) data
streams. The digital PDM data is then decimated down to
pulse-code modulated (PCM) digital words at the system
sampling rate of 32kHz.
ADAPTIVE FEEDBACK CANCELLER
The adaptive feedback canceller (AFC) reduces acoustic
feedback by forming an estimate of the hearing aid
feedback signal and then subtracting this estimate from the
hearing aid input. Therefore the forward path of the hearing
is not affected. Unlike adaptive notch filter approaches,
DUET's AFC does not reduce the hearing aid's gain. The
AFC is based on a time-domain model of the feedback
path.
Feedback path
HRX HEAD ROOM EXPANDER
H
+
-
Σ
The D/A is comprised of a digital, 3rd-order sigma-delta
modulator and an H-bridge. The modulator accepts PCM
audio data from the DSP path and converts it into a 32times over-sampled, 1-bit PDM data stream, which is then
supplied to the H-bridge. The H-bridge is a specialized
CMOS output driver used to convert the 1-bit data stream
into a low-impedance, differential output voltage waveform
suitable for driving zero-biased hearing aid receivers.
The GB3212 has an enhanced Head Room Expander
(HRX) circuit, which increases the input dynamic range of
the DUET™ DIGITAL without any unwanted audible
artifacts. This is accomplished by dynamically adjusting the
preamplifier's gain and the post-A/D attenuation depending
on the input level.
G
H'
FRONTWAVE® DIRECTIONALITY
Estimated feedback
Figure 4: Adaptive Feedback Canceller (AFC) block diagram
ADAPTIVE NOISE REDUCTION
Noise reduction is applied independently in each of 16
frequency bands. The algorithm utilizes perceptual criteria
to determine the audibility of individual noise bands. More
attenuation is applied to those bands where the noise is
most audible. Less attenuation is applied where the noise is
inaudible. This maximizes the perceptual benefit of noise
reduction and also reduces the audible artifacts that are
often associated with adaptive noise reduction algorithms.
The attenuation applied to a given band is determined by a
combination of two factors: the SNR and the masking
threshold. The SNR estimate in each band determines the
maximum amount of attenuation that will be applied to that
band (the poorer the SNR the greater the amount of
attenuation). At the same time the masking threshold
resulting from the energy in adjacent bands is also
estimated. Only enough attenuation is applied to bring the
energy in each 'noise' band to just below the masking
threshold. This prevents excessive amounts of attenuation
from being applied and thereby reduces unwanted artifacts
and distortion.
The FRONTWAVE® block provides the resources necessary
to implement directional microphone processing. The block
accepts inputs from both a front and rear microphone and
provides a synthesized directional microphone signal as its
output. The directional microphone output is obtained by
delaying the rear microphone signal and subtracting it from
the front microphone signal. Various microphone response
patterns can be obtained by adjusting the time delay.
The FRONTWAVE® circuit also provides a fixed filter for
compensating the sensitivity and frequency response
differences between microphones. The filter parameters are
adjusted during product calibration.
One of the generic IIR filters following the FRONTWAVE®
block ("pre1") has been allocated for low frequency
equalization to compensate for the 6dB/octave roll off in
frequency response that occurs in directional mode. The
amount of low frequency equalization that is applied can be
determined during product calibration.
Gennum recommends using matched microphones with
FRONTWAVE®, although calibration is fully possible using
unmatched microphones. Initially, calibration using
unmatched microphones will result in no difference in
directionality. However, over a longer period of time
unmatched microphones are more likely to drift apart and
result in poor directional characteristics.
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GB3212
FUNCTIONAL BLOCK DESCRIPTION
A/D AND D/A CONVERTERS
GENERIC BIQUAD FILTERS
AGCO
Frequency shaping can be achieved by configuring generic
biquad filters. The transfer function for each of the biquad
filters is as follows:
The AGCo module is an output limiting circuit whose
compression ratio is fixed at infinity:1. The threshold level is
programmable. The AGCo module has its own twin level
detector, with programmable attack and release time
constants.
b0 + b1 * z-1 + b2 * z-2
H(z) = _________________________
1 + a1 * z-1 + a2 * z-2
MS1 AND MS2 SWITCHES
There are two, two-pole Memory Select switches available
on the GB3212, which allows the user tremendous flexibility
in switching between configurations. These switches may
be either momentary or static as set up in the Interactive
Data Sheet.
-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 biquad with which they are
associated.
The underlying code in the product components
automatically checks all of the filters in the system for
stability (that is, 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 will automatically disable the biquad being
modified and display a warning message. When the filter is
made stable again, it can be re-enabled.
Note also 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 the user enters into IDS
will be ignored and the filter designed by the software will
be programmed instead. For more information on filter
design refer to Biquad Filters In PARAGON™ Digital Hybrid
information note, Document # 20205.
VOLUME CONTROL
The volume control (VC) can be either external or
programmable. If VC is programmed for external operation,
a 200kΩ variable resistor should be connected to the 9bit
A/D converter. Hysteresis is built into the Volume Control
circuitry to prevent unintentional volume level toggling. A
log taper potentiometer is recommended so that gain in dB
will be linear with potentiometer rotation.
Up to four memories can be configured. Enabled (valid)
memories must be sequential. For example, if three
memories were required, memories A, B and C would be
enabled. Memory A must always be valid.
Momentary Switch on MS1
This mode uses a single momentary switch on MS (Pin 13)
to change memories. Using this mode will cause the part to
start in Memory A and whenever the button is pressed the
next valid memory will be loaded. When the user is in the
last valid memory, a button press will cause memory A to be
loaded.
Examples:
If 4 valid memories ABCDABCDA…
If 3 valid memories ABCABCA…
If 2 valid memories ABABA…
If 1 valid memories AAA…
Static Switch on MS1 and MS2
This mode uses two static switches to change memories.
The following table 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 will
be smooth, otherwise, if one switch is changed and then
the other, the part will transition to an intermediate memory
before reaching the final memory. The part will start in
whatever memory the switches are selecting. If a memory is
invalid the part will not switch to the invalid memory, but
stay in the current memory.
MS1
MS2
Memory
LOW
LOW
A
LOW
OPEN
B (if valid otherwise no change)
OPEN
LOW
C (if valid otherwise no change)
OPEN
OPEN
D (if valid otherwise no change)
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GB3212
Note that the a0 coefficient is hard-wired to always be a 1.
The coefficients are each 16 bits in length and include one
sign bit, one bit to the left of the decimal point, and 14 bits
to the right of the decimal point. Thus, before quantization,
the floating-point coefficients must be in the range
Static Switch on MS1 Static Switch on MS2 (jump to memory D)
This mode uses two static switches to change memories.
Unlike in the previous example, this mode will switch to
memory D when the static switch on MS2 is OPEN. This
means that this mode will only use a maximum of three
memories (even if four valid memories are programmed).
The following table describes which memory is selected
depending on the state of the switches.
SELECTED MEMORY
# OF BEEPS
A
1
B
2
C
3
D
4
MS2
Memory
LOW
LOW
A
LOW
OPEN
D if valid otherwise no change)
OPEN
LOW
B (if valid otherwise no change)
OPEN
OPEN
D (if valid otherwise no change)
The programmable tone generator is capable of producing
programmable tones. Upon reception of the tone enable
instruction, the DUET™ DIGITAL connects the output of the
tone generator to the input of the D/A converter. The
programmed tone is then output until a tone disable
instruction is issued. When disabled, the normal audio
signal is again connected.
WIDE DYNAMIC RANGE COMPRESSION
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 will be smooth, otherwise, if one switch is
changed and then the other, the part will transition to an
intermediate memory before reaching the final memory.
The part will start in whatever memory the switches are
selecting. If the device starts up in a memory other than A,
and the memory beep tones are enabled, the device will
emit the corresponding tones for that memory. If a memory
is invalid and the part starts up with the switches indicating
this memory, the part will stay in memory A.
AUDIBLE MEMORY CHANGE INDICATOR
The DUET™ DIGITAL can be programmed to produce
tones to indicate a memory change. Using the Interactive
Data Sheet the GB3212 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
multiple beeps.
Any combination of adjacent frequency bands can be
grouped to form four independent channels of
compression. The I/O curve of each channel is divided into
up to four regions (linear, compression, return to linear,
clipping). The thresholds between these regions are
adjustable over a wide range. Each channel has twin
average detectors: a fast detector with a configurable time
constant and a slow detector with a configurable time
constant.
FREQUENCY SHAPING
The 16-band signal processor acts as a graphic equalizer.
The gain of each band can be adjusted over 0 to -42dB
range. The width of each band is 500Hz. The bands can be
selected to have either an even or odd stacking
arrangement. Selecting even stacking shifts the bands in
unison by one half-band width (250Hz) effectively doubling
the number of potential band edges. The default setting will
be even stacking as this effectively results in one "extra"
band since the nyquist band is "split" into two 250Hz bands,
one from 0 to 250Hz the other from 7750Hz to 8000Hz.
The amplitude and frequency of the memory change tone
can be selected independent of 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
change operation the selected tone will beep a code to
indicate which memory has been selected. The beep
sequence will be 150ms ON followed by a 150ms OFF time
between the beeps. The memory change beeping code is
deciphered in the table below.
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GB3212
TONE GENERATOR
MS1
POWER MANAGEMENT
The DUET™ DIGITAL hybrids have two power management
components on their controller chips: the Power-On-Reset
sequence and turn off/end of battery life system.
The DUET™ DIGITAL was designed to accommodate high
power applications. AC ripple on the supply can cause
instantaneous reduction of the battery's voltage, potentially
disruption the circuit's function. The GB3212 has a separate
power supply and ground connection for the output stage.
This allows hearing instrument designers to accommodate
external RC filters in order 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 Power-On-Reset block's purpose is to ensure that a
stable turn-on state is achieved. The blocks that are kept
OFF are the A/D and preamp channels (both front and rear),
the controller, the DSP chip, and the EEPROM power. A
small portion of the controller is enabled to monitor the
signals coming from the analog POR block. The audio
output is muted when the supply voltage is below the turnon threshold and during the power-on sequence.
An analog voltage comparator monitors the supply voltage
and feeds its output to a digital timer whose purpose is to
deglitch bouncy turn-ons. When the supply crosses the
1.1Vdc level (VBON) the timer starts and if the supply voltage
maintains a level above 1.0Vdc (VBOFF) for at least 30ms,
the disabled blocks will be enabled, else the timer is reset
and waits for the analog comparator to signal that supply is
again above VBON. This ensures rejection of any turn on
transients. Only after this 30ms finishes can the part start to
down load EEPROM configuration data, then configure and
activate the DSP.
the circuit caused by spikes on the supply line. For more
information on properly designing a filter to reduce supply
ripple, please refer to information note Using the GB3211
PARAGON Digital in High Power Application Initial Design
Tips document #24561.
Once the part is ON, dropping the supply below VBON
causes the Lowbat signal to become active but otherwise
the part continues to operate as normal. The Lowbat signal
true condition requires that the supply voltage remain below
VBON for at least 30ms.
Once the Lowbat signal becomes active, the audible low
battery voltage indicator will produce two consecutive
beeps, 0.45 second long. These two beeps will repeat
every 30 seconds. The communication with the hybrid is not
possible when the beeps are being produced by the
hybrid. The frequency and the amplitude of the beeps are
programmable.
If the supply drops below 1.0Vdc (VBOFF), then the part is
put into an OFF state, there is no debouncing of this signal,
and the action is immediate. This level was chosen since
the regulator has a 950mV regulation voltage. The regulator
needs some headroom to ensure that it maintains good
supply rejection, which is critical in high gain, high power
applications to prevent system instability.
The GB3212 operates in shallow-reset mode, during the
power-on sequence circuit starts when the supply voltage
rises above the turn-on threshold (VBON) after shutdown.
The device will function until the supply voltage drops
below the turn-off threshold (VBOFF) but will recover once the
supply voltage rises above the turn-on threshold (VBON)
again.
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LOW BATTERY INDICATOR (POWER-ON/POWER-OFF)
PAD LOCATION
Y
Xdim
Ydim
0
0
26.5
24.5
2
-36
0
27.5
24.5
3
-70.25
0
23
24.5
4
-102.75
0
24
24.5
5
-137.25
0
27
24.5
6
-175.5
0
31.5
24.5
7
-180.25
32
21
21.5
8
-180.25
59.5
21
15.5
9
-180.25
90
21
27.5
10
-139
90
43.5
27.5
11
-97
90
22.5
27.5
12
-65
90
23.5
27.5
13
-30.75
90
27
10
11
8
12
13
27.5
14
2.5
89.75
21.5
28
15
0
57.75
26.5
18
16
0
30.5
26.5
18.5
16
17
-95
52
24.5
24.5
1
1
0
0
0.673
0.622
2
-0.914
0
0.699
0.622
3
-1.784
0
0.584
0.622
4
-2.610
0
0.610
0.622
5
-3.486
0
0.686
0.622
6
-4.458
0
0.800
0.622
7
-4.578
0.813
0.533
0.546
8
-4.578
1.511
0.533
0.394
9
-4.578
2.286
0.533
0.699
10
-3.531
2.286
1.105
0.699
11
-2.464
2.286
0.572
0.699
12
-1.651
2.286
0.597
0.699
13
-0.781
2.286
0.686
0.699
14
0.064
2.280
0.546
0.711
15
0
1.467
0.673
0.457
16
0
0.775
0.673
0.470
17
-2.413
1.321
0.622
0.622
15
17
7
6
5
4
14
3
2
0.01875
(0.476)
0.01925
(0.489)
Dimension units are in inches.
Dimensions in parentheses are in millimetres, converted from inches
and include minor rounding errors.
1.0000 inches = 25.400mm
Dimension tolerances: ±0.003 (±0.08) unless otherwise stated.
Work order number: XXXXXX
This Hybrid is designed for either point-to-point manual soldering
or for reflow according to Gennum's reflow process
(Information Note 521-45).
DOCUMENT IDENTIFICATION
REVISION NOTES:
PRELIMINARY DATA SHEET
The product is in a preproduction phase and specifications
are subject to change without notice.
Corrected Package Dimensions drawing.
GB3212
X
0.092 MAX
(2.34)
9
PAD DIMENSION
1
GB 3212
0.129
(3.28)
PAD POSITION
MIL
PAD
NO.
0.217
(5.51)
mm
PACKAGE DIMENSIONS
For latest product information, visit www.gennum.com
GENNUM CORPORATION
GENNUM JAPAN CORPORATION
MAILING ADDRESS:
P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3
Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946
Shinjuku Green Tower Building 27F, 6-14-1, Nishi Shinjuku,
Shinjuku-ku, Tokyo, 160-0023 Japan
Tel. +81 (03) 3349-5501, Fax. +81 (03) 3349-5505
SHIPPING ADDRESS:
970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
© Copyright May 2002 Gennum Corporation. All rights reserved. Printed in Canada.
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