BA3835F_11 [ROHM]

Silicon Monolithic Integrated Circuit; 硅单片集成电路


型号：	BA3835F_11
厂家：	ROHM
描述：	Silicon Monolithic Integrated Circuit 硅单片集成电路
文件：	总5页 (文件大小：175K)
中文：	中文翻译
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Structure :

Product :

Silicon Monolithic Integrated Circuit

Band-pass filter for spectrum analyzer for car audio systems

Type ::

BA3835F

Function : 1. Built-in band pass filter for spectrum analyzer. BA3835F is for 5 bands.

2. Designed for 5V microcomputer power voltage.

Absolute Maximum Ratings (Ta=25℃)

Parameter

Symbol

Vcc

Rating

Unit

Power Supply voltage

Power dissipation

Operating temperature

Storage temperature

450^※

℃

Topr

Tstg

-25～+75

-55～+125

℃

※This value decreases 4.5 mW/℃ for Ta=25℃ or more.

Operating Voltage Range（Ta＝25℃）

Parameter

Power supply voltage

Symbol

Vcc

Min.

4.5

Typ.

5.0

Max.

6.5

Unit

Electrical Characteristics

（Unless specified particularly, Ta＝25℃，V_CC＝5V，R_L＝10MΩ,V_AIN＝－30dBV，SEL＝1）

Limit

Symbol

Parameter

Unit

Conditions

Min.

Typ.

Max.

V_AIN＝0V，A，B，C，SEL＝0

Circuit current

I_CC

－

8.5

V_AIN＝－14dBV,，Measured at each output

Maximum output level

Output offset voltage

V_OM

4.0

4.8

－

V_AIN＝0V，SEL＝0/1， Measured at

each output （cycle time：Ts＝50ms）

V_OS

－

150

f_IN＝105Hz，A＝0，B＝0，C＝1

f_IN＝340Hz，A＝0，B＝1，C＝0

f_IN＝1kHz，A＝1，B＝0，C＝0

f_IN＝3.4kHz，A＝1，B＝1，C＝0

f_IN＝10.5kHz，A＝1，B＝1，C＝1

Standard output level 1

Standard output level 2

Standard output level 3

Standard output level 4

Standard output level 5

V_O1

V_O2

V_O3

V_O4

V_O5

0.65

1.35

1.70

Application example

Note that ROHM cannot provide adequate confirmation of patents.

The product described in this specification is designed to be used with ordinary electronic equipment or devices (such as audio-visual

equipment, office-automation equipment, communications devices, electrical appliances, and electronic toys).

Should you intend to use this product with equipment or devices which require an extremely high level of reliability and the malfunction of which

would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel

controllers and other safety devices), please be sure to consult with our sales representative in advance.

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Limit

Typ.

Parameter

Symbol

Unit

Conditions

Min.

Max.

120

－

f_IN＝1kHz

f_IN＝1kHz，V_AIN＝V_CIN

Input impedance

R_IN

CMRR

V_IH

100

kΩ

Common-mode rejection ratio

Logic input high level

－

2.5

5.0

－

Not applicable in the whan item 10 of

operation notes applies.

Logic input low level

V_IL

－

0.5

Output response time^*1

Discharge level

T_O

－

μsec

－

Reset pulse width T_R＝10μsecTyp.^*2

*1 The time from the rise of A, B, C or SEL until the rise of AOUT (90％ of peak). If the output selection time is less than this, the output voltage is not

guaranteed and the reset pulse is not generated.

*2 Automatically generated internally based on the output select signal. For the duration that this signal is “H”, a resister is connected to the peak hold

capacitor, and the output level drops by –3dB (typ.) for one pulse.

*3 The Q of the bandpass filter is 3.5

◎ Not designed for radiation resistance.

Output select logic table

SEL

AOUT

GND

105Hz

340Hz

GND

1kHz

GND

3.4kHz

10.5kHz

×: Don't Care.

Timing chart

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Block Diagram

Terminal Number/ Terminal Name

A C

GND

１８

ＢＩＡＳ

１

Terminal

Number

Terminal

Name

BIASC

VREFC

RREF

N.C

AOUT

１７

VREFC

２

ＶＲＥＦ

DIFOUT

N.C

TEST

１６

RREF

３

E F R N E

CURRENT

F E E C

CIN

AIN

VCC

１５

４

105Hz

BPF

PEAK

HOLD

N.C

DIF UT

SEL

１４

RES

SEL

N.C

５

PEAK

HOLD

340Hz

BPF

TEST

AOUT

GND

RES

PEA

HOLD

1kH

１３

６

MPX

Outline Dimension

CIN

PEAK

HOLD

3.4kH

BPF

DIF

１２

７

RES

10.5k

PEAK

HOLD

BA3835F

BPF

AI N

１１

８

LOT No.

１０

９

DEC

SOP18 （Unit：mm）

Application example

(1) Numbers and data in entries are representative design values and are not guaranteed values of the items.

(2) Although we are confident in recommending the sample application circuits, carefully check their

characteristics further when using them. When modifying externally attached component constants before

use, determine them so that they have sufficient margins by taking into account variations in externally

attached components and the Rohm LSI, not only for static characteristics but also including transient

characteristics.

(3) Absolute maximum ratings

If applied voltage, operating temperature range, or other absolute maximum ratings are exceeded, the LSI may

be damaged. Do not apply voltages or temperatures that exceed the absolute maximum ratings. If you think

of a case in which absolute maximum ratings are exceeded, enforce fuses or other physical safety measures

and investigate how not to apply the conditions under which absolute maximum ratings are exceeded to the

LSI.

(4) GND potential

Make the GND pin voltage such that it is the lowest voltage even when operating below it. Actually confirm

that the voltage of each pin does not become a lower voltage than the GND pin, including transient phenomena.

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(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

Provided that the IC is operated within the

recommended operating conditions and the

The frequency characteristics of this IC are determined

by the resistor connected between the R_REFterminal

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

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.

(note: all bands will shift together).

(12) Output offset voltage

(9) Load characteristics

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

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.

characteristics of the peak hold circuit, the graph is a

line sloping downwards to the right. In other words, the

shorter

(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.

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

BA3835F

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.

In this case, the “L” voltage applied to the internal

comparator input terminal V₁is given by:

R¹+R

V¹=

× Vref

R1+R2+R

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:

20kΩ+R

× 1.5V+0.25V ＜ 1.5V

20kΩ+20kΩ+R

And from this, the following condition is obtained:

R＜30kΩ

In this case, the “L” level voltage V2 for the IC will be:

V₂＜0.75V

(11) Recommended operating ranges

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Notice

N o t e s

No copying or reproduction of this document, in part or in whole, is permitted without the

consent of ROHM Co.,Ltd.

The content speciﬁed herein is subject to change for improvement without notice.

The content speciﬁed herein is for the purpose of introducing ROHM's products (hereinafter

"Products"). If you wish to use any such Product, please be sure to refer to the speciﬁcations,

which can be obtained from ROHM upon request.

Examples of application circuits, circuit constants and any other information contained herein

illustrate the standard usage and operations of the Products. The peripheral conditions must

be taken into account when designing circuits for mass production.

Great care was taken in ensuring the accuracy of the information speciﬁed in this document.

However, should you incur any damage arising from any inaccuracy or misprint of such

information, ROHM shall bear no responsibility for such damage.

The technical information speciﬁed herein is intended only to show the typical functions of and

examples of application circuits for the Products. ROHM does not grant you, explicitly or

implicitly, any license to use or exercise intellectual property or other rights held by ROHM and

other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the

use of such technical information.

The Products speciﬁed in this document are intended to be used with general-use electronic

equipment or devices (such as audio visual equipment, ofﬁce-automation equipment, commu-

nication devices, electronic appliances and amusement devices).

The Products speciﬁed in this document are not designed to be radiation tolerant.

While ROHM always makes efforts to enhance the quality and reliability of its Products, a

Product may fail or malfunction for a variety of reasons.

Please be sure to implement in your equipment using the Products safety measures to guard

against the possibility of physical injury, ﬁre or any other damage caused in the event of the

failure of any Product, such as derating, redundancy, ﬁre control and fail-safe designs. ROHM

shall bear no responsibility whatsoever for your use of any Product outside of the prescribed

scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or

system which requires an extremely high level of reliability the failure or malfunction of which

may result in a direct threat to human life or create a risk of human injury (such as a medical

instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-

controller or other safety device). ROHM shall bear no responsibility in any way for use of any

of the Products for the above special purposes. If a Product is intended to be used for any

such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology speciﬁed herein that may

be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to

obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.

More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System

http://www.rohm.com/contact/

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R1120

BA3835F_11 [ROHM]

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