Monolithic Linear IC

Ordering number : EN4715A

31097HA (OT)/61094TH(OT) A8-9997 No. 4715-1/21

LA1193M, 1193V

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

High-Performance FM Front End for Car Radios

Overview

The LA1193M and LA1193V are front-end ICs developed
for use in car radios. It incorporates an extremely wide
dynamic range mixer and a new AGC system consisting
of a dual-system wide-band AGC and a new keyed AGC
to provide excellent interference suppression
characteristics.

Functions

ˇ Double-balance mixer
ˇ Pin diode drive output
ˇ Differential IF amplifier
ˇ Dual-system wide-band AGC circuit
ˇ Local buffer output
ˇ 3D-AGC system
ˇ FET gate drive AGC output
ˇ IF amplifier gain control pin

Features

ˇ Improved interference characteristics

-- Expanded mixer input dynamic range

Mixer input usable sensitivity: 15 dBľ
Mixer input I.M. QS:

90 dBľ

(The dynamic range has been increased by 6 dB
over the earlier LA1175M.)

-- Development of a new wide-band AGC circuit

Improved interference characteristics for both near-
channel interference and far-channel interference
Improved interference characteristics for the TV band

-- Development of a 3D-AGC system

The adjacent channel two-signal interference
characteristics can be effectively improved without
degrading the strong-field three-signal interference
characteristics during keyed AGC operation.

ˇ Improved stability design

-- AGC circuit local oscillator isolation

Measures were taken to prevent the deterioration of
AMR, noise level, THD and other characteristics
during AGC operation.

-- AGC circuit incorrect operation measures

The LA1193M provides methods to prevent
incorrect operation due to local oscillator injection
and loss of DC balance.

ˇ Improved temperature characteristics

-- Conversion gain
-- AGC sensitivity
-- Antenna damping drive output current

Package Dimensions

unit: mm

3036B-MFP20

unit: mm

3179A-SSOP20

[LA1193M]

[LA1193V]

SANYO: SSOP20

Specifications

Maximum Ratings

at Ta = 25°C

Note:

Connect a resistor (up to 10 k

) between pins 17 and 19.

Operating Conditions

at Ta = 25°C

Operating Characteristics

at Ta = 25°C, V

= 8.0 V, in the specified test circuit, f = 88 MHz, f

OSC

= 77.3 MHz

Note: Values in parenthesis are for LA1193V.

No. 4715-2/21

LA1193M, 1193V

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

max

for pins 5 and 17

max mix

for pins 10 and 11

Pd max

LA1193M: (Ta

70°C)

500

Allowable power dissipation

Mounted on a 41

1.1 mm

glass-Epoxy board

Pd max

LA1193V: (Ta

70°C)

500

Mounted on a 23

1.6 mm

glass-Epoxy board

Operating temperature

Topr

40 to +85

°C

Storage temperature

Tstg

40 to +125

°C

Parameter

Symbol

Conditions

Ratings

Unit

min

typ

max

Current drain

CCO

No input, V

CONT

= 0 V

Antenna damping current

ANT-DI

88 MHz, 100 dBľ, V

CONT

= 4.0 V

7.0

9.5

12.5

AGC high voltage

AGC-H

88 MHz, 0 dBľ, V

CONT

= 4.0 V

7.6

7.9

AGC low voltage

AGC-L

88 MHz, 100 dBľ, V

CONT

= 4.0 V

0.4

0.9

Saturation output voltage

OUT

88 MHz, 110 dBľ, V

CONT

= 4.0 V

110

dBľ

3 dB limiting sensitivity

Vi-Limit

88 MHz, 110 dBľ, V

CONT

= 4.0 V

dBľ

Conversion gain

A. V

88 MHz, 75 dBľ, V

CONT

= 4.0 V

101

104

dBľ

Local buffer output

OSC

-Buff

No input, no modulation

105

109

dBľ

Narrow V

AGC-ON

V-NAGC

88 MHZ, V

CONT

= 4.0 V, at an input level

dBľ

such that V

AGC-OUT

is 2 V or less

(76)

(83)

(90)

Wide V

AGC-ON

V-WAGC

88 MHZ, V

CONT

= 0 V, at an input level

101

105

dBľ

such that V

AGC-OUT

is 2 V or less

88 MHZ, V

CONT

variable, with 95 dBľ

3D-AGC-ON

V3D-AGC

being the V

CONT

voltage input such that

0.4

0.6

0.8

AGC-OUT

switches from high to low and

2.0 V as the V

AGC

threshold value.

Parameter

Symbol

Conditions

Ratings

Unit

Recommended supply voltage

8.0

Operating supply voltage range

7.6 to 9

Continued from preceding page.

No. 4715-6/21

LA1193M, 1193V

Pin No.

Function

Equivalent circuit

Note

Mix input (1)

Mix input (2)

Mix out (1)

Mix out (2)

Antenna damping
drive output

IF GND

W-AGC input

Mixer input usable sensitivity
15 dBľ

Mixer input I.M. QS
90.5 dBľ
(6.5 dB higher than previous products)

Conversion gain
15 dB

Input impedance
25

ANTD

= 10 mA

Since the DC cut capacitor is provided on-chip in the
pin internal circuit, we have taken steps to prevent
incorrect AGC operation due to inter-pin leakage
currents.

Continued on next page.

Continued from preceding page.

No. 4715-7/21

LA1193M, 1193V

Pin No.

Function

Equivalent circuit

Note

N-AGC input

IF AMP bypass

IF AMP input

IF AMP output

IF AMP gain adjust

RF AGC output

IF, AGC, V

Keyed AGC input

Since the DC cut capacitor is provided on-chip in the
pin internal circuit, we have taken steps to prevent
incorrect AGC operation due to inter-pin leakage
currents.

IF gain: 25 dB
Input and output impedances of 330

The IF gain can be adjusted by inserting a resistor
between pins 17 and 19.
The gain is at its maximum when there is no resistor
inserted.

MOSFET
Second gate control

Controls the narrow AGC.

1. Oscillator Circuit

Steps were taken to prevent AMR degradation during earlier product type
AGC operation, since the local oscillator block in this IC has independent
Vd (pin 5) and ground (pin 3) connections.

This is a Colpitts oscillator and has the same structure as that used in
earlier circuits. The oscillation level and intensity are changed by
capacitors C

2-4

, C

and C

2. Local Oscillator Buffer Output

This buffer is an emitter follower circuit.

If desired, the buffer efficiency can be increased by inserting a resistor
between pin 1 and ground to pass more current through the buffer
transistor. However, this current must be limited so that Pdmax for the
package is not exceeded.

3. Interference Characteristics

The LA1193M incorporates a newly developed 3D-AGC (triple dimension) circuit. This circuit allows three-signal
interference characteristics (inter-modulation characteristics) and two-signal sensitivity suppression characteristics to
be provided at the same time, a combination of characteristics previously thought difficult to achieve.

ˇ Inter-Modulation Characteristics

The LA1193M prevents inter-modulation distortion by applying two wide-band AGC circuits.

No. 4715-8/21

LA1193M, 1193V

Figure 1

This double wide-band AGC system consists of two AGC circuits and a narrow AGC (pin 13 input, mixer input
detection type) as shown in Figure 1. Figure 2 shows the antenna input frequency characteristics.

Figure 2 AGC Sensitivity Detuning Characteristics

Features of the Double Wide AGC System

-- Since this is a mixer input detection wide-band AGC, it prevents the occurrence of intermodulation due to

interfering stations with

f > 1 MHz. (TV band interference prevention)

-- Since this system uses a narrow AGC at the same time, the wide AGC sensitivity can be lowered, thus

preventing incorrect operation due to local oscillator injection.

-- Optimal sensitivities for any field conditions can be set, since the sensitivities of both the wide and narrow

AGC systems can be set by changing the values of external components.

-- The input level of the desired station is limited by the narrow AGC. As a result, excessive levels are no longer

input to the stages that follow the mixer and the beats at multiples of 10.7

A are reduced.

ˇ Two-Signal Sensitivity Suppression Characteristics

Previously, keyed AGC systems were used to provide good intermodulation distortion and two signal sensitivity
suppression characteristics at the same time. However, in previous keyed AGC systems, when the desired station
would fade or drop out, the wide band AGC level would become essentially zero. As a result, the automatic station
selection function would malfunction and blocking oscillation would occur in the presence of strong interfering
stations. Thus keyed AGC systems were extremely hard to use in actual practice. Sanyo has developed a new AGC
system (3D-AGC) that solves these problems and allows the construction of extremely simple application circuits.
The LA1193M/V incorporates this AGC system.

What is the 3D-AGC system?

It is a system that determines the wide-band AGC level by using information that has the following three frequency
characteristics.

No. 4715-9/21

LA1193M, 1193V

RF and antenna circuit information
Mixer circuit information
C, F and selectivity information

Mixer input AGC
Mixer output AGC
S-meter output

Three
dimensions

3D-AGC Features

3D-AGC Sensitivity,

f and V20 Characteristics

Figure 3 3D-AGC Sensitivity,

f and V20 Characteristics

-- The W-AGC sensitivity is determined by the antenna RF circuit selectivity independently of V

-- The N-AGC sensitivity is determined by the antenna, RF and mixer circuit total selectivity when V

is 0.6 V

or greater. It is determined by that selectivity and V

when V

is over 0.6 V.

-- The improvement in two-signal sensitivity suppression is the shaded area in the total AGC sensitivity and

corresponds to the section occupied by the N-AGC.

No. 4715-10/21

LA1193M, 1193V

Feature

Merit

The narrow AGC sensitivity, which operates for

f of less than 1.5 MHz, is

controlled independently according to the field strength of the desired
station.

The narrow AGC sensitivity is controlled at V20 values under 2 V.

The wide AGC operates even when V

is zero, i.e., when the desired

station does not exist.

The N-AGC and the W-AGC sensitivities can be set independently.

The system has two AGC systems, the N-AGC and the W-AGC.

ˇ This is effective as a measure for mitigating two signal sensitivity

suppression.

ˇ This allows two signal sensitivity suppression to be mitigated without

deterioration in the three signal characteristics.

ˇ This allows the prevention of incorrect stopping on intermodulation

signals during search.

ˇ This allows the prevention of intermodulation occurring in the antenna

and RF modulation circuits in the presence of strong interfering stations.
Prevention of blocking oscillation due to AGC operation is also possible.

ˇ This allows optimal settings to match the reception field conditions.

ˇ Since the narrow AGC operates at the desired station and at adjacent

stations, it is possible to reduce the wide AGC sensitivity. This prevents
incorrect AGC operation due to local oscillator injection.

4. Mixer

The mixer circuit used in this IC is a balanced input/balanced output double balance mixer circuit.

ˇ Input Format

Emitter input
Input impedance: 25

Optimization of the component geometry, emitter
current and bias allow this circuit to achieve the
following performance.

Mixer input usable sensitivity: 15 dBľ
Mixer input IMQS*: 90.5 dBľ

Note: * Mixer input IMQS is defined as follows:

5. IF Amplifier

This IF amplifier is a single stage differential amplifier.

Specifications

Input impedance:

330

Output impedance: 330

Gain:

25 dB

Gain adjustment can be provided using either of
the methods shown.

Temperature Characteristics

The LA1193M/V uses Vref temperature characteristics correction to hold the gain temperature characteristics to the
low level of about 1 dB over the range 30 to +80°C.

No. 4715-11/21

LA1193M, 1193V

fr = 98.8 MHz, no input
fu1 = 98.8 MHz, 1 kHz, 30% modulation
fu2 = 99.6 MHz, no modulation

IMQS is the interference 1 and 2 input levels such that when an

interference signal with the same level is input to the mixer and

distortion occurs at the mixer, the generated IM output has a S/N

ratio of 30 dB.

Figure 4 Mixer Circuit

(Improved by 6.0 dBľ over previous products.)

IF Gain adj

6. AGC Circuit

The LA1193M/V uses pin diode antenna damping (pin 9) and MOSFET second gate voltage control (pin 16) for
AGC. The AGC operating sequence is as follows:

Antenna damping (pin diode)

MOSFET second gate voltage control

(attenuation) 20 dB

(attenuation) dB

The above AGC sequence is used for the following reasons.

ˇ Intermodulation distortion can occur if a signal of 110 dBľ or larger is input to the antenna circuit varactor diode.

In such situations, if the AGC sequence was MOSFET second gate voltage control followed by pin diode antenna
damping, as long as the receiver was not in a strong field where the 60 dB or higher AGC attenuation operates,
input limitation due to the antenna circuit varactor diode would operate. Therefore, we feel that the AGC operating
sequence employed is appropriate.

ˇ Consider the problem of AGC loop stability. If the two AGC loops (the antenna damping AGC loop and the

MOSFET second gate control AGC loop) operate, the AGC system would become unstable and have an
excessively large influence on the transient response. Therefore the following structure cannot be used.
MOSFET second gate control

antenna damping

MOSFET second gate control

The AGC operating conditions are the same as those for the LA1175M.

ˇ Narrow AGC circuit

Since the LA1193M/V's N-AGC (which detects the mixer output) is set to have a high sensitivity, care is required
to avoid incorrect operation. In particular, there must be adequate separation from the local oscillator block on the
printed circuit board pattern. Also, a resistor of at least 500

must be inserted at the pin 13 input. A low-pass filter

is formed by the insertion of this resistor. This low-pass filter prevents incorrect AGC operation due to the local
oscillator.

ˇ The AGC sensitivity setting can be changed by adjusting the

value of the capacitor connected at pin 13. Although the AGC
sensitivity can be lowered by increasing the value of the series
resistor, caution is required since the AGC has its own frequency
characteristics.

ˇ Wide AGC circuit

The wide AGC sensitivity is set by the value of the capacitor on pin 8. However, since incorrect operation due to
the local oscillator signal may occur if this capacitor is too large, its value must be chosen carefully.

ˇ 3D-AGC

If the difference in sensitivity between the N-AGC and the W-AGC systems is too large during 3D-AGC
operation, the S/N ratio can be degraded in the vicinity of the input where the AGC switches. Therefore, the
3D-AGC setting values must be selected carefully. Although this problem can be ameliorated by applying a time
constant to pin 20, in principle, this S/N ratio degradation should be prevented by limiting the sensitivity difference
between the two AGC systems.

No. 4715-12/21

LA1193M, 1193V

No. 4715-13/21

LA1193M

Pd max Ta [LA1193M]

Allowable power dissipation, Pdmax mW

Ambient temperature, Ta °C

Pd max Ta [LA1193M]

Allowable power dissipation, Pdmax mW

Ambient temperature, Ta °C

I/O characteristics

Noise, AF out dBm

Antenna input level dBľ

Two-signal interference characteristics

Desired station input level dB

Interfering station input level dBľ

I/O characteristics

S-meter voltage, V

Total harmonic distortion, THD %

AF out, noise out, AM out dBm

AGC output voltage, V

AGC

S-meter voltage, V

Total harmonic distortion, THD %

Antenna input level dBľ

Two-signal interference characteristics

Desired station input level dB

Interfering station input level dBľ

No. 4715-14/21

LA1193M, 1193V

Three-signal interference characteristics

Desired station input level dB

Interfering station input level dBľ

Three-signal interference characteristics

Desired station input level dB

Interfering station input level dBľ

Two-signal interference characteristics

Noise, AF out dBm

Interference antenna input dBľ

Unit (Resistance:

, Capacitance: F)

O AGC

, I

ANT-D

MIX

AGC output voltage, V

AGC

Antenna damping current mA

Mixer input dBľ

O AGC

, antenna dump, FET source V

ANT

Pin 16 AGC output voltage V

Antenna damping voltage (pin 9), FET source V

Antenna input dBľ

Unit (Resistance:

, Capacitance: F)

No. 4715-15/21

LA1193M, 1193V

O AGC

, I

ANT-D

IN AGC

Pin 16 AGC output voltage, V

Antenna damping current mA

Pin 13 AGC input dBľ (the input value at point A)

O AGC

, I

ANT-D

IN AGC

Pin 16 AGC output voltage V

Antenna damping current mA

Pin 8 AGC input dBľ (the input value at point A)

O AGC

, I

ANT-D

MIX

AGC output voltage,V

AGC

Antenna damping current mA

Mixer input dBľ

Unit (Resistance:

, Capacitance: F)

AGC frequency response

AGC input level dB

(Pin 16 V

AGC

2 V)

AGC input frequency MHz

AGC frequency response

AGC input level dB

(Pin 16 V

AGC

2 V)

AGC input frequency MHz

Mixer input

f MHz

Unit (Resistance:

, Capacitance: F)

No. 4715-16/21

LA1193M, 1193V

AGC ON level Ta

Pin 20 voltage, V

Ambient temperature, Ta °C

AGC ON level Ta

AGC ON level dB

Ambient temperature, Ta °C

AGC

CL20

AGC input ON level dB

(AGC ON =

AGC

< 2 V, pin 13 input)

Pin 20 voltage, V

CL20

AGC20

CL20

N-AGC ON level

(V16 < 2 V) (N-AGC pin 13 input)

Pin 20 voltage, V

AGC

-ON level dB

(when pin 16

2 V)

AGC input frequency MHz

AGC ON level Ta

AGC ON level dB

(when pin 16

2 V)

Ambient temperature, Ta °C

Unit (Resistance:

, Capacitance: F)

No. 4715-21/21

LA1193M, 1193V

OSC

Oscillator buffer output level dB

Supply voltage, V

OSC

Oscillator buffer output dB

Load resistance, R

OSC

kHz

Supply voltage, V

Unit (Resistance:

, Capacitance: F)

Unit (Resistance:

, Capacitance: F)

Unit (Resistance:

, Capacitance: F)

This catalog provides information as of March, 1997. Specifications and information herein are subject to
change without notice.

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 loss.

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 responsibility 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.

Part Number LA1193M