SANYO LA1175

Ordering number : EN2276B
Monolithic Linear IC
LA1175, 1175M
FM Front End For Car Radio,
Home Stereo Applications
Functions
Package Dimensions
• Double-balanced type MIX, PIN diode drive AGC output,
MOS FET gate drive AGC output, keyed AGC,
differential IF amplifier, buffer amplifier for oscillation,
local oscillation.
unit: mm
3020A-SIP16
[LA1175]
Features
• By using the keyed AGC system, which is effective in
improving the sensitivity suppression characteristic, in
combination with the antenna damping AGC (PIN diode
driver on chip) and MOS FET 2nd gate drive AGC, the
intermodulation characteristic for a large undesired signal
is greatly improved. It is also possible to use the keyed
AGC system in combination with the antenna damping
AGC or MOS FET 2nd gate drive AGC.
• The temperature characteristic and noise figure are
improved. The same supply voltage makes it easy to use
the LA1175, 1175M.
SANYO: SIP16
unit: mm
3035A-MFP16
[LA1175M]
SANYO: MFP16
Specifications
Maximum Ratings at Ta=25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Symbol
VCC max
Pd max
Conditions
Ratings
Unit
Pins 4, 14
9.5
V
Pins 8, 9
15
V
LA1175 : Ta≤70°C
460
mW
LA1175M : Ta≤70°C
435
mW
Mounted on PCB (bakelite)
2
of 40mm×48mm×1.8mm
Operating temperature
Topr
–20 to +70
°C
Storage temperature
Tstg
–40 to +125
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
93097HA (KT)/D0994JN/3237TA/8226KI, TS No.2276-1/14
LA1175, 1175M
Operating Conditions at Ta=25°C
Parameter
Symbol
Recommended supply voltage
VCC
Operating voltagerange
VCC op
Conditions
Ratings
Pin 4, 8, 9, 14
Unit
8
V
8 to 9
V
Electrical Characteristics at Ta=25°C, VCC=8V, See specified Test Circuit.
Parameter
Symbol
Ratings
Conditions
Unit
min
typ
max
23.0
28.0
33.0
7.6
7.9
0.2
0.7
V
260
330
400
Ω
Current drain
ICC
Pins 4, 8, 9, 14 : no input
AGC high-level voltage
VAGCH
VIN=0dBµ, VCL=4V
AGC low-level voltage
VAGCL
VIN=100dBµ, VCL=4V
IF input resistance
RIN
AGC control input
VCL7
VIN=100dBµ, VAGC=7V
0.25
0.5
V
VCL2
VIN=100dBµ, VAGC=2V
1.1
1.6
2.1
V
LA1175 : VIN=75dBµ
99
102
105
dBµ
LA1175M : VIN=75dBµ
97
100
103
dBµ
Voltage gain
AV
Input limiting voltage
VINlim
mA
V
LA1175 : Referenced to VIN=110dBµ
81
88
95
dBµ
LA1175M : Referenced to VIN=110dBµ
80
87
94
dBµ
81
AGC input voltage
ViAGC
VAGC=2V
67
74
Saturation output voltage
VOUT
LA1175 : VIN=110dBµ
110
114
dBµ
LA1175M : VIN=110dBµ
100
113
dBµ
OSC BUFF output
VOSC BUFF
1kΩ load
105
109
dBµ
ANT damping drive
IANT-D
VIN=100dBµ
4.5
6.0
8.0
dBµ
mA
Allowable power dissipation, Pd max – mW
Allowable power dissipation, Pd max – mW
current
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No.2276-2/14
LA1175, 1175M
Equivalent Circuit Block Diagram and Peripheral Circuit : LA1175
Unit (resistance : Ω, capacitance : F)
MIX output IFT 10mm
YT-20577
(Mitsumi)
014-022
(Sumida)
EKSC-30174FCU (Toko)
OSC coil YT-30013 (Mitsumi)
WIRE 0.8φ inside dia. 6mmφ 4T air core
MIX output (small-sized)
47K-074-124 (Sumida)
Equivalent Circuit Block Diagram and Peripheral Circuit : LA1175M
MIX output IFT 10mm
YT-20577
(Mitsumi)
014-022
(Sumida)
EKSC-30174FCU (Toko)
OSC coil YT-30013 (Mitsumi)
WIRE 0.8φ inside dia. 6mmφ 4T air core
MIX output (small-sized)
47K-074-124 (Sumida)
Unit (resistance : Ω, capacitance : F)
No.2276-3/14
LA1175, 1175M
Internal Connection Diagram : LA1175
Unit (resistance : Ω, capacitance : F)
VAGC – V
IF output – dBµ
Current drain, ICC – mA
Input/Output Characteristic
MIX input – dBµ
Supply voltage, VCC – V
No.2276-4/14
LA1175, 1175M
MIX output – dBµ
MIX BLOCK Input/Output Characteristic
Unit (resistance : Ω, capacitance : F)
MIX input – dBµ
IF output – dBµ
IF BLOCK Input/Output Characteristic
IANTD – mA
VAGC – V
ViANTD – dBµ
IF input – dBµ
VAGC Input/Output Characteristic (AGC BLOCK)
∆f – MHz
VAGC – dBµ
Pin 10 input – dBµ
Unit (resistance : Ω, capacitance : F)
C 10 – pF
No.2276-5/14
IANTD – mA
VAGC output(pin 13) – V
LA1175, 1175M
VCL – V
OSC buffer output, VOSC BUFF – dBµ
OSC buffer output, VOSC BUFF – dBµ
VCL input – V
Load resistance, RL – Ω
Capacitive load, CL – pF
∆fOSC – kHz
OSC buffer output, VOSC BUFF – dBµ
Unit (capacitance : F)
Supply voltage, VCC – V
Supply voltage, VCC – V
AGC Circuit Friquency Characteristic
Output – dB
VAGC – V
VSM – V
Pin 10 input – dBµ
3SK181+LA1175+LA1140 Overall Characteristics
Unit (resistance : Ω,
capacitance : F)
ANT input – dBµ
Frequency – MHz
No.2276-6/14
LA1175, 1175M
Desired S/N=80dBµ ANT input – dBµ
Intermodulation Characteristic
Intermodulation dummy used
Unit (resistance : Ω)
Undesired ANT input 1, 2 – dBµ
Cross Modulation Characteristic
Desired S/N=30dB antenna input – dBµ
Desired S/N=30dB antenna input – dBµ
Intermodulation Characteristic
Undesired antenna input – dBµ
Undesired antenna input – dBµ
Improvement of IM characteristic in strong undesired input signal mode when ANT damping AGC is used (LA1174).
Test conditions
fD : 99.1MHz, fm=400Hz 100% mod
Desired signal
fU1 : 97.9MHz non-mod SG open 132dBµ
fU2 : 96.7MHz fm=1kHz 100% mod
Undesired signal 1
ANT circuit
Undesired signal 2
Intermodulation dummy
Unit (resistance : Ω)
No.2276-7/14
LA1175, 1175M
Cross point
Cross point
The open input level of undesired signal 2 at which the IM output and desired signal output are at the same level.
IM output
• Desired signal
: Non-mod at each specified input
• Undesired signal 1
: Non-mod at input 132dBµ (SG open)
• Undesired signal 2
: 100% mod with input variable
Desired signal output • Desired signal
: 100% at each specified input
• Undesired signal 1
: Non-mod at input 132dBµ (SG open)
• Undesired signal 2
: Non-mod with input variable
Desired input level
With ANT damping
RF AGC and
ANTD AGC
Without ANT
damping
RF AGC only
Improvement
50dBµ
60dBµ
70dBµ
80dBµ
90.5dBµ
109dBµ
123dBµ
Test
impossible
Refer to Fig. A.
59.5dBµ
72dBµ
89dBµ
98dBµ
Refer to Fig. B.
31dB
37dB
34dB
Fig. B Intermodulation Characteristic
(with ANT damping)
Output – dB
Output – dB
Fig. A Intermodulation Characteristic
(with ANT damping)
Undesired input 2 – dBµ
Undesired input 2 – dBµ
Solid line
Solid line
Broken line
Broken line
Intermodulation dummy
Intermodulation dummy
Unit (resistance : Ω, capacitance F)
No.2276-8/14
LA1175, 1175M
S/N – dB
3SK181+LA1175+LA1140 Cross Modulation Characteristic
(Sensitivity Suppression Characteristic in strong undesired input signal mode
∆f – kHz
Unit (resistance : Ω, capacitance : F)
Test Circuit
Shield code
Unit (resistance : Ω, capacitance : F)
No.2276-9/14
LA1175, 1175M
Sample Application Circuit : LA1175M
Temperature Characteristics
(1), (2), (3)
Test Circuit
Unit (resistance : Ω, capacitance : F)
No.2276-10/14
LA1175, 1175M
Temperature Characteristics (4)
Temperature Characteristics (5)
Temperature Characteristics (6)
Temperature Characteristics (7)
Unit (resistance : Ω, capacitance : F)
Temperature Characteristic (2)
78dBµ sensitivity – dBµ
VCL (V16) – V
3dB limit sensitivity – dBµ
VAGC (V13) – V
VAGD on, ANTD on sensitivity – dBµ
Temperature Characteristic (1)
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No.2276-11/14
LA1175, 1175M
Temperature Characteristic (4)
VCL (V16) – V
IANTD (I6) – mA
Temperature Characteristic (3)
Ambient temperature, Ta – °C
Temperature Characteristic (5)
ViAGC (AGC block) – dBµ
MIX 78dBµ sensitivity – dBµ
Ambient temperature, Ta – °C
Temperature Characteristic (4)
Ambient temperature, Ta – °C
Temperature Characteristic (6)
IF input – dBµ
VO IF max – dBµ
Ambient temperature, Ta – °C
Temperature Characteristic (5)
Ambient temperature, Ta – °C
Temperature Characteristic (6)
VO IF output – dBµ
IF –3dB sensitivity – dBµ
Ambient temperature, Ta – °C
Temperature Characteristic (6)
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No.2276-12/14
LA1175, 1175M
Temperature Characteristic (7)
OSC frequency variation, ∆fOSC – kHz
OSC frequency variation, ∆fOSC – kHz
Temperature Characteristic (7)
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
VOSC – dBµ
Temperature Characteristic (7)
Ambient temperature, Ta – °C
Description of AGC circuit in the LA1175, 1175M
The LA1175, 1175M are designed so that AGC is operated in the order shown below.
ANT damping (PIN diode) → MOS FET 2nd gate voltage control
(Attenuation)20dB
(Attenuation)60dB
The following are the reasons why AGC is operated in this order.
(1) When a signal of 110dBµ or greater is applied to the varactor in the ANT circuit, intermodulation may occur. In
this case, if AGC is operated in the order of MOS FET 2nd gate control AGC → ANT damping (PIN diode), the
input to the varactor in the ANT circuit is not restricted unless a strong signal with AGC attenuation 60dB or
greater is given. Therefore, AGC should be operated in the order shown above.
(2) If the two AGC loops (AGC loop (ANT damping) and AGC loop (MOS FET 2nd gate control)) are operated
simultaneously, the transient response of AGC loses stability. Therefore, the order shown below is
impracticable.
MOS FET 2nd gate control → ANT damping → MOS FET 2nd gate control.
No.2276-13/14
LA1175, 1175M
Relation between keyed AGC and two AGC loops
For the LA1170, keyed AGC provides AGC attenuation control (RF MOS FET 2nd gate). For the LA1175, 1175M,
however, there are two AGC loops as shown above. Therefore, keyed AGC must be applied to both of the two AGC
loops. The LA1175, 1175M contain the ANT damping circuit to improve intermodulation in a strong field, but the
prevention of intermodulation in a strong field and the improvement of the sensitivity suppression characteristic by
keyed AGC are mutually exclusive as mentioned below.
Conditions Desired signal
Weak field
Undesired signals 1, 2
Strong field (Field strength in which the ANT circuit may cause
intermodulation to occur)
If keyed AGC is operated to cause AGC-OFF mode to be entered when a desired signal is received, the varactor in the
ANT circuit may be distorted and intermodulation may occur, which means that it is meaningless for the LA1175,
1175M to contain the ANT damping circuit because it produces no effect. Therefore, the effect of the keyed AGC
circuit in the LA1175, 1175M on the ANT damping circuit is made less than that in the LA1170 so that the abovementioned problem does not arise. However, if the LA1175, 1175M are used under the same conditions as for the
LA1170 (no ANT damping, pin 6 open), keyed AGC is operated in the same manner as for the LA1170.
Application circuit used in a very strong field
Since the LA1175, 1175M are designed to be operated from single supply, the dynamic range of the MIX output
becomes narrower as compared with the dual-supply type (VCC MIX=12V, other=8V) heretofore in use. IF an
adjacent interference channel signal is very strong, the intermodulation characteristic at ∆f=400kHz is deteriorated,
because the dynamic range of the MIX output exceeds the limit, which causes a distortion to occur.
The following three countermeasures are available.
1. Q of the MIX coil is made higher to provide a higher selectivity.
(Must be balanced with the detection band of the wide-band AGC)
2. The LA1175, 1175M are operated from dual supplies (Most ideal).
3. The application circuit shown below is used.
Make the resistor
value as small as
possible.
(add)
Unit (capacitance : F)
No products described or contained herein are intended for use in surgical implants, life-support systems,
aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and
the like, the failure of which may directly or indirectly cause injury, death or property lose.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates,
subsidiaries and distributors and all their officers and employees, jointly and severally, against any
and all claims and litigation and all damages, cost and expenses associated with such use:
Not impose any responsibilty for any fault or negligence which may be cited in any such claim or
litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of
their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees
are made or implied regarding its use or any infringements of intellectual property rights or other rights of
third parties.
This catalog provides information as of September, 1997. Specifications and information herein are
subject to change without notice.
No.2276-14/14