SANYO LA1845NV_06

Ordering number : ENN*7931
LA1845NV
Monolithic Linear IC
Single-Chip Home Stereo IC
The LA1845NV is designed for use in mini systems and is a single-chip tuner IC that provides electronic tuning
functions using SD/IF-count technique. It incorporates a pilot canceler and an adjustment-free MUX VCO circuit,
thus allows additional parts to be reduced.
Functions
• AM
: RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, SD, oscillator buffer, IF buffer, stereo IF output,
AGC time constant switch
• FM IF : IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output
• MPX : PLL stereo decoder, stereo display, forced monaural, VCO stop, audio muting, adjacent channel interference
rejection function, pilot canceler
Features
• Integrated MPX VCO (ceramic resonators are no longer required.)
• Built-in adjacent channel interference rejection function (114kHz, 190kHz)
• Supports both SD and IF-count techniques
• Both FM SD sensitivity and bandwidth can be set
• Pilot canceler built in.
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum Power Supply Voltage
VCC max
Allowable Power Consumption
Pd max
Conditions
Ratings
Unit
6
V
Ta = 80°C with board
360
114.3mm×76.1mm×1.6mm material :
mW
Glass epoxy resin
Operating Temperature
Topr
-20 to +80
°C
Storage Temperature
Tstg
-40 to +125
°C
Operating Conditions at Ta = 25°C
Parameter
Symbol
Recommended Supply Voltage
VCC
Operating Supply Voltage Range
VCC op
Conditions
Ta = 80°C
Ratings
Unit
5
V
4.3 to 5.5
V
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
92706 / 91004 JO IM No.7931-1/10
LA1845NV
Electrical Characteristics • Operating Characteristics at VCC = 8V, in the specified test circuit.
FM Mono Characteristics at fc = 10.7MHz, Vi = 100dBµ, fm = 1kHz, Modulation = 75kHz
Parameter
Conditions
Ratings
min
typ
Unit
max
Current Drain
With no input signal
Demodulator Output
100dBµ, 100% modulation, fm = 1kHz
20
30
40
mA
230
360
460
mVrms
Total Harmonic Distortion
100dBµ, 100% modulation, fm = 1kHz
0.35
1.5
%
Signal-to-Noise Ratio
100dBµ, 100% modulation, fm = 1kHz
73
80
dB
AM Rejection Ratio
100dBµ, AM = 30% modulation, fm = 1kHz
47
65
dB
3dB Sensitivity
100dBµ, 100% modulation, fm = 1kHz Output reference,
32
-3dB input
SD Sensitivity
0% modulation
IF Counter Buffer Output
100dBµ
Mute Attenuation
100dBµ, 100% modulation, fm = 1kHz
40
dBµ
38
47
56
dBµ
200
275
400
mVrms
76
dB
FM Stereo Characteristics at fc = 10.7MHz, Vi = 100dBµ, L+R = 90%, Pilot = 10%, fm = 1kHz
Parameter
Conditions
Ratings
min
typ
Unit
max
Separation
L+R = 90%, Pilot = 10%, fm = 1kHz
30
42
Stereo On Level
Pilot input
1.5
3.5
5.5
%
Total Harmonic Distortion
Pilot input
0.45
1.5
%
Adjacent Channel Rejection Ratio 1
fs = 113kHz, VS = 90%, Pilot = 10% ;
The left-right modulation, demodulated output
Adjacent Channel Rejection Ratio 2
fs = 189kHz, VS = 90%, Pilot = 10% ;
The left-right modulation, demodulated output
Carrier Leak
L+R = 90%, Pilot = 10% reference, Pilot = 10% output
38
dB
36
dB
41
dB
44
dB
AM Characteristics at fc = 1000kHz, Vi = 80dBµ, fm = 1kHz, Modulation = 30%
Parameter
Conditions
Ratings
min
13
typ
Unit
max
Current Drain
With no input signal
27
39
mA
Detector Output 1
23dBµ, 30% modulation, fm = 1kHz
40
80
160
mVrms
Detector Output 2
80dBµ, 30% modulation, fm = 1kHz
90
160
230
mVrms
Signal-to-Noise Ratio 1
23dBµ, 30% modulation, fm = 1kHz
17
23
Signal-to-Noise Ratio 2
80dBµ, 30% modulation, fm = 1kHz
46
Total Harmonic Distortion 1
80dBµ, 30% modulation, fm = 1kHz
0.4
1.1
%
Total Harmonic Distortion 2
107dBµ, 30% modulation, fm = 1kHz
0.5
1.3
%
dB
52
dB
SD Sensitivity
0% modulation
11
20
29
dBµ
Local Oscillator Buffer Output
With no input signal
100
140
200
mVrms
IF Counter Buffer Output
23dBµ
140
285
400
mVrms
No.7931-2/10
LA1845NV
Package Dimensions
unit : mm
3175B
Pin Description
Pin No.
1
Pin function
FM IF input
Pin voltage
Equivalent circuit
Notes
Vreg
Input impedance ri = 330Ω
1
3
2
AM mixer output
VCC
Connect the mixer coil between this pin and VCC
2
3
REG
4
AM IF input
2.1
3
Vreg
Vreg = 2.1V
Input impedance ri = 2kΩ
4
5
GND
6
Tu-LED
7
ST-LED/AF-IF
0V
VCC
6
output
8
FM detector
Active low
VCC
7
Open collector
The 600BEAS-10471 (Toko Mfg. Co., Ltd.) is
recommended for detector coil.
9
VCC
Continued on next page.
No.7931-3/10
LA1845NV
Continued from preceding page.
Pin No.
10
Pin function
AM/FM IF counter
Pin voltage
Equivalent circuit
Notes
0V
V10≤0.5V : Reception state
1.4V≤V10≤2.2V : Muting on
V10≥3.5V : IF counter output and muting on
output, output
control switch, mute
switch
11
Phase comparator
10
VCC-1.0
The device operates in AM mode when a current of
11
low-pass filter
over 200µA flows from pin. 12.
(AM/FM switching)
12
Pilot detector low-
VCC-1.0
The device is forced to monaural when a current of
12
pass filter (Forced
over 50µA flows from this pin.
mono) (VCO stop)
The VCO is stopped when a current of over 200µA
flows from this pin.
The limit values for the resistor are the same as
those for pin 11.
13
L outputs
14
R outputs
3.2V
Output impedance ro = 3.3kΩ
13
(
15
Pilot canceler
Vreg
14
)
15
output
3
16
Decoder input
Vreg
Inverting input pin
RNF
RNF = 20kΩ
16
17
PLL input
Vreg
Input impedance ri = 20kΩ
17
18
FM demodulator
output
Vreg+0.7
18
Output impedance ro = 2.3kΩ
The channel separation can be adjusted with an
external capacitor connected between this pin and
ground.
Continued on next page.
No.7931-4/10
LA1845NV
Continued from preceding page.
Pin No.
Pin function
19
AM detector output
Pin voltage
Equivalent circuit
Notes
0V (FM)
Output impedance ro = 3.3kΩ
1.5V (AM)
19
20
S meter,
0.2V (FM)
The resistance of the built-in resistor R is 13.9kΩ.
AM AGC
0.9V (AM)
The SD response during seek operation is
determined with the external capacitor connected to
20
this pin.
R
21
AM RF input
Vreg
Must be used at the same potential as pin 22.
21
22
AFC
Vreg
The FM SD bandwidth can be adjusted with the
external resistor connected between this pin and
pin 3 (Vreg).
22
23
OSC
VCC
Connect the oscillator coil between this pin and pin
23
9 (VCC).
Note : Impedance of the secondary oscillator coil
must be 5kΩ or higher.
24
Oscillator buffer
VCC-1.4
The FM SD sensitivity can be adjusted with an
output,
FM SD sensitivity
adjustment
external resistor connected to this pin.
Output impedance R = 200Ω
R
24
Note : Resistance of the external resistor
connected to the pin 24 must be 3.3kΩ or higher.
No.7931-5/10
LA1845NV
Equivalent Circuit Block Diagram
No.7931-6/10
75Ω
FM-IN
(10.7MHz)
2
1
0.047µF
23
24
39pF 20pF
0.047µF
33µF
300Ω
6.8kΩ
1000pF 5.6kΩ
OSC
BUFF
3
4
21
3.3µF
39MH
50Ω
0.047µF
HW6215
22
HW50425
AM-IN
(1MHz)
5
20
19
0.01µF
1000pF
50kΩ
V-SD
6
7
8
17
10kΩ
20kΩ
Detector coil
Discriminator
600BEAS-10471
50kΩ
20kΩ
10µF
4.7µF
18
AM IF
1000pF
V-ST
ST-LED
LA1845NV
TU-LED
22µF
0.047µF
9
1000pF
AM/FM
IF-BUFF
16
65kΩ
0.1µF
SEEK
AM
12
13
1µF 3kΩ
0.015µF
0.47µF
11
14
NORMAL
20pF
10
15
0.0047µF
FM
LPF
ROUT
LOUT
VCC
5.0V
Top view
MONO
1µF
LPF
0dB
0.015µF
A
A
LA1845NV
Test Circuit
No.7931-7/10
LA1845NV
No.7931-8/10
LA1845NV
No.7931-9/10
LA1845NV
Specifications of any and all SANYO Semiconductor products described or contained herein stipulate the
performance, characteristics, and functions of the described products in the independent state, and are
not guarantees of the performance, characteristics, and functions of the described products as mounted
in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an
independent device, the customer should always evaluate and test devices mounted in the customer's
products or equipment.
SANYO Semiconductor Co., Ltd. strives to supply high-quality high-reliability products. However, any
and all semiconductor products fail with some probability. It is possible that these probabilistic failures
could give rise to accidents or events that could endanger human lives, that could give rise to smoke or
fire, or that could cause damage to other property. When designing equipment, adopt safety measures
so that these kinds of accidents or events cannot occur. Such measures include but are not limited to
protective circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO Semiconductor products (including technical data,services) described
or contained herein are controlled under any of applicable local export control laws and regulations, such
products must not be exported without obtaining the export license from the authorities concerned in
accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system, or
otherwise, without the prior written permission of SANYO Semiconductor Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO Semiconductor product that you intend to use.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
guaranteed for volume production. SANYO Semiconductor 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, 2004. Specifications and information herein are subject
to change without notice.
PS No.7931-10/10