Linear IC. A1231N Datasheet

A1231N IC. Datasheet pdf. Equivalent


Sanyo Semicon Device A1231N
Ordering number : EN660A
Monolithic Linear IC
LA1231N
FM IF System
Overview
Package Dimensions
Being developed for FM IF System, LA1231 is a highly unit: mm
integrated circuit in which almost all functions are 3006B-DIP16
contained concerning the FM tuner IF stage. The block
diagram of equivalent circuit is shown below. Usual
[LA1231N]
peripheral circuits are shown also in examples of
application circuits.
The IF amplifier and limiter stages are composed of 6-
stage double-end type differential amplifier, which is
superior on its AMR. The signal meter driving stage which
is located in parallel therewith consists of a 3-stage level
detector circuit and a drive circuit in order to extend the
linear area.
The FM detection stage composed of a double-balance type
SANYO: DIP16
quadrature detecting circuit is attached with a low frequency preamplifier and muting control circuit.
The muting drive stage is composed of the following 3 circuits.
1) A level detection circuit which detects the S/N ratio of carrier wave when the input is weak.
2) A circuit which detects the dc output of FM detector's 'S' curve when detuning is made.
3) A driving circuit.
Thus, this muting driving stage can reduce foreign factors such as the interstation noises, the shock noise caused from
muting when detuning is made, and so forth.
Besides, a voltage-inverting circuit is built in LA1231N so that the muting may be enabled at any appropriate input signal
level. The output of this voltage-inverting circuit is connected with the muting drive output terminal. Thus, the muting can
be placed to the ON or OFF status when a control voltage is applied from other section to the input terminal of the voltage-
inverting circuit. For the control voltage, the output of the signal meter driver is appropriate. Both the AFC output stage
and tuning meter driving stage are of the current-driven type. So, not only the sensitivity of AGC but also the muting band
(when detuning is made) can be controlled by an outer resistor.
Being utilized for disabling the FM IF amplifier when AM reception is made, the IF amplification/stop circuit can decrease
the shock noise caused at the conversion between FM and AM reception modes.
Functions
• IF amplification, Limiter.
• Quadrature detection.
• AF preamplifier.
• Muting at weak.
• Muting at the detuning.
• Signal meter drive output.
• AFC tuning meter drive output.
• Delay AGC output.
• Inverting circuit for muting drive voltage. • IF amplifier stop circuit.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
O2097HA (KT)/8044/D040KI No.660-1/8


A1231N Datasheet
Recommendation A1231N Datasheet
Part A1231N
Description Monolithic Linear IC
Feature A1231N; Ordering number : EN660A Monolithic Linear IC LA1231N FM IF System Overview Package Dimensions B.
Manufacture Sanyo Semicon Device
Datasheet
Download A1231N Datasheet




Sanyo Semicon Device A1231N
LA1231N
Features
• High sensitivity on limiting : 18µV typ.
• Low distortion : 0.05% typ. determined by the linearity of phase characteristics in phase shifting circuit.
• High demodulation output : 330 mVrms typ.
• High S/N ratio : 78.5dB typ.
• Muting at detuning with little shock noise.
• Single meter drive output proportional with the input signal level dB.
• Detuning muting band having good symmetrics.
• Tuning meter driving output having wide swing width.
• Delay AGC drive output for front end.
• Constant voltage circuit is built-in : operation voltage=9 to 14V.
• Muting characteristics between adjacent stations are distinguished.
Equivalent Circuit Block Diagram
Voltage regulator
IF amp/limiter
Guadrature
limiter
Guadrature
det
AFC/tuning
meter drive
Level
det
Level
det
Level
det
Level
det
Level
det
DC
level
IF amp
stop
Signal meter
drive
Mute drive
AF amp
Mute
control
Specifications
Maximum Ratings at Ta=25°C
Parameter
Symbol
Maximum supply voltage
VCCmax
Maximum input voltage
Maximum supply current
VIN
ICC
Maximum flow-in current
Maximum flow-out current
I15
I16
I10
I12
I13
Allowable power dissipation
I15
Pd max
Operating temperature
Topr
Storage temperature
Tstg
Pin 11
Pins 1-2
Pin 11
Pin 15
Pin 16
Pin 10
Pin 12
Pin 13
Pin 15
Conditions
Ratings
16
±1
40
1
1
2
2
2
2
650
–20 to +70
–40 to +125
Unit
V
Vp-p
mA
mA
mA
mA
mA
mA
mA
mA
°C
°C
No.660-2/8



Sanyo Semicon Device A1231N
LA1231N
Recommended Operating Conditions at Ta=25°C
Parameter
Symbol
Conditions
Supply voltage
VCC
Ratings
12
Unit
V
Operating Characteristics at Ta=25°C, VCC=12V, f=10.7MHz
Parameter
Quiescent current
Current drain
Demodulated output
S/N
Input limiting voltage
Total harmonic distortion
Muting sensitivity
Muting attenuation
Muting bandwidth
AM rejection ratio
Muting driving output
Signal meter driving output
AGC output
IF off current
Voltage of muting operation
Offset voltage
Pin voltage
Symbol
Conditions
min
ICCO
ICC
Vo
VIN(lim)
THD
VIN(mute)
Mute(att)
VIN=100dBµ
VIN=100dBµ, 400Hz-100% mod
VIN=100dBµ, 400Hz-100% mod
Vo 3dB down, 400Hz-100% mod
VIN=100dBµ, 400Hz-100% mod
V12=1.4V
V5=2V, VIN=100dBµ,
400Hz-100% mod
240
72
23
60
BW(mute) VIN=100dBµ, V12=1.4V
AMR
VIN=100dBµ, FM : 400Hz-100% mod
AM : 1kHz-30% mod
140
45
V12 Quiescent
VIN=100dBµ
V13 Quiescent
VIN=70dBµ
VIN=100dBµ
V15 Quiescent
VIN=100dBµ
I15(off)
Quiescent, V8-1020mV
V16(mute) VIN=100dBµ, V12=1.4V
V6-10 B Quiescent, pin 6-10
V7-10 B Quiescent, pin 7-10, R7-10=5.1k
V1 Quiescent
V2 Quiescent
V3 Quiescent
V6 Quiescent
V7 Quiescent
V8 Quiescent
V10 Quiescent
V12 Quiescent
V13 Quiescent
V15 Quiescent
4.0
0
0
1.9
4.5
4.2
0
10
0.7
–0.5
–0.25
Ratings
Unit
typ max
22 30 mA
26.5 33 mA
330 460 mVrms
78.5 dB
25 31 dBµ
0.05 0.3 %
29 35 dBµ
65 dB
220 370 kHz
60 dB
4.9 6.0
0 0.3
0 0.1
3.0 4.2
5.5
5.0 5.5
0 0.5
35 60
0.84 1.0
0 +0.5
0 +0.25
2.6
2.6
2.6
5.6
5.6
5.4
5.6
4.9
0
5.0
V
V
V
V
V
V
V
µA
V
V
V
V
V
V
V
V
V
V
V
V
V
No.660-3/8







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