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BA3835F Fiches technique(PDF) 4 Page - Rohm

No de pièce BA3835F
Description  Silicon Monolithic Integrated Circuit
Download  5 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BA3835F Fiches technique(HTML) 4 Page - Rohm

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REV. G
(5) Thermal design
Perform thermal design in which there are adequate margins by taking into account the allowable power dissipation
in actual states of use.
(6) Shorts between pins and misinstallation
When mounting the LSI on a board, pay adequate attention to orientation and placement discrepancies of the LSI.
If it is misinstalled and the power is turned on, the LSI may be damaged. It also may be damaged if it is shorted by
a foreign substance coming between pins of the LSI or between a pin and a power supply or a pin and a GND.
(7) Operation in strong magnetic fields
Adequately evaluate use in a strong magnetic field, since there is a possibility of malfunction.
(8) Frequency characteristics
The frequency characteristics of this IC are determined
by the resistor connected between the R
REF terminal
and GND. For the specification conditions, the value of
this resistor is 100kΩ. If it is necessary to set the
frequency characteristics accurately, use a variable
resistor
(note: all bands will shift together).
(9) Load characteristics
To convert the bias sense output signal to the GND
sense signal, the IC performs a V / I conversion, and
then an I /V conversion using a 10kΩresistor (Typ.) for
the output. Therefore, if the load circuit connected to
the AOUT pin has a MOS structure there is no problem
(eg. Microprocessor input port), but if the connected
circuit has a low input impedance, it may cause the
output level to drop.
(10) External resistor for the control pin
When using a common port for the output select
control and FL drive, you must add a diode and resistor
as shown in the right figure to prevent the FL drive
“L”
voltage from destroying the IC.
In this case, the
“L” voltage applied to the internal
comparator input terminal V
1 is given by:
To maintain a noise margin of at least 2.5V with
respect to the comparator threshold level VREF, the
representative values for VREF, R1 and R2 are 1.5V,
20kΩ, and 10kΩrespectively. This gives:
And from this, the following condition is obtained:
R<30kΩ
In this case, the
“L” level voltage V2 for the IC will be:
V
2<0.75V
(11) Recommended operating ranges
Provided
that
the
IC
is
operated
within
the
recommended
operating
conditions
and
the
recommended temperature range, the basic circuit
functions are guaranteed. Within these ranges, ratings
for electrical characteristics for conditions other than
those stipulated cannot be guaranteed, but the inherent
function of the band pass filter will be maintained.
(12) Output offset voltage
The relationship between the output offset voltage and
the output selection cycle (cycle time) for this IC is
shown in Fig.5. The maximum output offset voltage of
150mV that is given in the electrical characteristics
table is under the condition that Ts = 200ms.
When Ts is greater than 50ms, the graph of the output
offset voltage is a straight line at 150mV. When Ts is
below 50ms, due to transient
characteristics of the peak hold circuit, the graph is a
line sloping downwards to the right. In other words, the
shorter
the cycle, the larger the output offset voltage.
Furthermore, the output offset voltage may shift due to
soldering or other temperature stresses from the
surroundings. Therefore, when setting the spectral
analyzer light level, take into consideration the points
given above
and make sure that it does not light by mistake during
quiescent periods. Use the chart below as a guide for
this, and, if necessary, leave even a larger margin.
V1 =
× Vref
R1+R2+R
R1 +R
× 1.5V+0.25V < 1.5V
20kΩ+20kΩ+R
20kΩ+R
BA3835F


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