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PDF LA1776M Data sheet ( Hoja de datos )
| Número de pieza | LA1776M | |
| Descripción | Monolithic Linear IC Single-Chip Tuner IC | |
| Fabricantes | Sanyo Semicon Device | |
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Ordering number : ENN8085
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SANYO Semiconductors
DATA SHEET
Monolithic Linear IC
LA1776M Single-Chip Tuner IC for Car Radios
Overview
The LA1776M integrates all six blocks required in a car radio tuner on a single chip.
Functions
• FM front end
• FM IF
• Noise canceller
• Multiplex
• AM up-conversion
• FM/AM switch
• MRC
Feature
• Reduced noise in the mixer and amplifier blocks for improved performance
• Increased FM front end mixer dynamic range for improved three signal characteristics
• Improved AM practical sensitivity and saturated signal-to-noise ratio
• S-meter sample-to-sample variations can be improved by using the FM S-meter shift function (Fixed resistors can
be used for the SD, keyed AGC, muting on adjustment, muting attenuation, SNC, and HCC.)
• High-speed searching can be implemented using the FM band mute time constant switching function.
• Superb listenability provided by improved medium and weak field noise canceller characteristics.
• Improved separation temperature dependency characteristics
• Excellent FM S-meter voltage linearity
• Noise rejection improved by modifications to the NC circuit
• Sample-to-sample variation correction circuit (zapping) in the FM IF circuit
• Stopping at stations with heavy interference is prevented by increasing the AM wide AGC sensitivity by 10 dB
during seek operations
• Built-in anti-birdie filter
Any and all SANYO 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 representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO 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 products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40706 MS OT B8-7756 No.8085-1/41
1 page  
LA1776M
Continued from preceding page.
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Parameter
Symbol
Conditions
Ratings
min typ max
unit
[AM Characteristics] AM ANT input
Practical sensitivity
Detector output
Pin 31 detector output
AGC F.O.M.
S/N-30
VO-AM
VO-AM31
VAGC-FOM
1 MHz, 30 dBµ, fm = 1 kHz, 30% modulation, pin 15
1 MHz, 74 dBµ, fm = 1 kHz, 30% modulation, pin 15
1 MHz, 74 dBµ, fm = 1 kHz, 30% modulation, pin 31
1 MHz, 74 dBµ, referenced to the output, the input amplitude
such that the output falls by 10 dB. Pin 15
20 dB
140 210 280 mVrms
130 190 260 mVms
51 56 61 dB
Signal-to-noise ratio
Total harmonic distortion
Signal meter output
Oscillator buffer output
Wide band AGC sensitivity
S/N-AM
THD-AM
VSM AM-1
VSM AM-2
VOSCBUFF AM
W-AGCsen1
W-AGCsen2
1 MHz, 74 dBµ, fm = 1 kHz, 30% modulation
1 MHz, 74 dBµ, fm = 1 kHz, 80% modulation
No input
1 MHz, 130 dBµ, unmodulated
No input, the pin 15 output
1.4 MHz, the input when V48 = 0.7 V
1.4 MHz, the input when V48 = 0.7 V (seek mode)
50 56
dB
0.3 1 %
0.0 0.1 0.5 V
3.9 4.9 6.8 V
185 230
mVrms
89 95 101 dBµ
80 86 92 dBµ
SD sensitivity
SD-sen1 AM 1 MHz, the ANT input level such that the IF counter output turns on. 24 30 36 dBµ
SD-sen2 AM 1 MHz, the ANT input level such that the SD pin goes to the on state. 24 30 36 dBµ
IF buffer output
VIFBUFF-AM 1 MHz, 74 dBµ, unmodulated. The pin 23 output
180 220
mVrms
Note: These measurements must be made using the either the IC-51-0644-692 IC socket (manufactured by Yamaichi Electronics).
* 1. When the resistor between pin 58 and ground is 200 kΩ.
* 2. When the resistor between pin 58 and ground is 30 kΩ.
Package Dimensions
Unit:mm
3159A
Mounted on a 40 × 18 × 1.3 mm3
glass epoxy printed circuit board
Ambient temperature, Ta – ºC
No.8085-5/41
5 Page 
Continued from preceding page.
Pin No.
Pin
LA1776M
Description
15 MPX output (left)
16 MPX output (right)
AM output
FM multiplex output
For deemphasis, use the following capacitors:
50 µS: 0.015 µF
75 µS: 0.022 µF
17
Pilot canceller signal
input
Adjustment is required since the pilot signal level
varies with the sample-to-sample variations in the IF
output level and other parameters.
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Equivalent circuit
VCC
3.3 kΩ
3.3 kΩ
15
0.015 µF
16
0.015 µ F
VCC
50 kΩ
10 kΩ
6.7 kΩ
17
0.01 µF
18
50 kΩ
VCC
18
Pilot canceller signal
output
Pin 18 is the output pin for the pilot canceller signal.
300 Ω 330 Ω
17 18
0.01 µF 50 kΩ
Continued on next page.
No.8085-11/41
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LA1776M.PDF ] | |
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