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PDF LA1787M Data sheet ( Hoja de datos )
| Número de pieza | LA1787M | |
| Descripción | Single-Chip Tuner IC | |
| Fabricantes | ON Semiconductor | |
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Ordering number : ENN6655
LA1787M
Monolithic Linear IC
Single-Chip Tuner IC
for Car Radios
http://onsemi.com
Overview
The LA1787M integrates all six blocks required in a car radio tuner on a single chip.
Functions
• FM front end
• AM up-conversion
• FM IF
• FM/AM switch
• Noise canceller
• MRC
• Multiple
Features
• Improved noise reduction methods
— The FM front end provides excellent 3-signal characteristics equivalent to those of the LA1193M.
— Superlative listenability due to improved medium and weak field noise canceller characteristics.
— Improved separation characteristics
— Anti-birdie filter
— Improved AM and FM thermal characteristics
— Excellent FM signal meter linearity
— Modified N.C. circuit for improved noise rejection
• Improved AM adjacent channel interference characteristics (40 kHz)
• Double conversion AM tuner (up conversion) Reduces the number of external components required as compared to
earlier double conversion tuners, in particular, no crystal is required (when used in conjunction with the LC72144).
• Sample-to-sample variation reduction circuit built into the FM IF circuit.
(Fixed resistors are used for the SD, keyed AGC, mute on adjustment, ATT, SNC, and HCC functions.)
• Improved FM separation temperature characteristics
• The LA1787 inherits the block arrangement of the LA1780M and supports pin-compatible designs.
Package Dimensions
unit : mm (typ)
QIP64E(14X14)
17.2
14.0
1.6
1.0 0.8
0.35
1.0
33
48
32
49
0.15
Mounted on a 40 x 80 x 1.3 mm
glass epoxy printed circuit board
Independent IC
64
1
15.6
17
16
0.1
2.7
0.8
Ambient temperature, Ta C
Semiconductor Components Industries, LLC, 2011
January, 2011
72602RM (OT) No. 6655-1/54
1 page  
LA1787M
Operating Characteristics and Symbols Used in the Test Circuit Diagrams
Switches (SW)
Switch on = 1, SW off = 0
There are two switches that use signal transfer.
— SW2: switches between the mixer input and the IF input.
— SW4: switches between noise canceler input and IF output + noise canceler input.
Types of SG used
PG1 (AC1)
AC2
AC3
AC4
AC5
Used for noise canceler testing. A pulse generator and an AF oscillator are required.
Used for FM front end testing. Outputs an 83 MHz signal.
Used for FM IF, noise canceler, and MPX testing. Outputs a 10.7 MHz signal. Stereo modulation must be possible.
Used for AM testing. Outputs 1 MHz and 1.4 MHz signals.
Used with the MRC. Can also be used for AF and OSC.
Power supply
VCC
VCC1
VCC2
VCC3
8V
5V
0.1 V / 0.7 V / 2 V / 4 V
0.1 V / 0.6 V / 2 V
• Switches
These levels
must be variable.
SD, stereo, seek/stop
Keyed AGC, Mute ATT
HCC, SNC, SASC (MRC)
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
Parameter
ON OFF
AM/FM switching. The FE VCC is supplied to pin 62.
FM IF switching. Pin 51/FE output
FM
FE IF OUT (A)
AM
AC3 (B)
For conversion gain testing
Conversion gain measurement (A)
Other/purposes
For switching between noise canceler input and IF output + noise canceler.
AC1 (A)
Other/purposes
High-speed SD
High-speed SD
Other/purposes
SEEK/STOP (IF BUFF ON/OFF)
STOP
Seek (IF buffer output)
MUTE ATT 200 kΩ
MUTE 200 kΩ
OFF
MUTE ATT 30 kΩ
MUTE 30 kΩ
OFF
For pilot cancellation testing
When pilot cancellation is used When pilot cancellation is not used
Mute off (pin 33)
MUTE OFF
MUTE ON
• Trimmers (variable resistors)
VR1
VR2
Separation adjustment
Pilot cancellation adjustment
Test Points
• DC voltages
VD1
VD2
VD3
VD4
VD5
VD6
VD7
FM RF AGC voltage
AM/FM SD, AM Tweet, FM stereo indicator
AM/FM S-meter
MRC output
Mute drive output
AM antenna damping voltage
N.C. Gate time
Pin 2
Pin 26
Pin 24
Pin 27
Pin 33
Pin 46
Pin 8
• AC voltages
VA1 AM/FM OSC Buff Pin 4
VA2
First IF output
Pin 53 → CF → pin 51 load level (10.7 MHz)
VA3
IF counter buffer
Pin 23 (10.7 MHz/450 kHz)
VA4 MPX OUT Left ch Pin 15 (AF)
VA5 MPX OUT Right ch Pin 16 (AF)
No. 6655-5/54
5 Page 
Continued from preceding page.
Pin No.
Function
LA1787M
Description
27 MRC control voltage time
constant
The MRC detector time constant
is determined by a 100 Ω resistor
and C2 when discharging and by
the 2-µA current and C2 when
charging.
Equivalent circuit
VCC
2µA
VCC
C2
27
100Ω
Pin 28
28 SNC control input
The sub-output is controlled by a
0 to 1-V input.
29 HCC control input
The high band frequency output is
controlled by a 0 to 1-V input.
It can also be controlled by the
MRC output.
Use a resistor of at least 100 kΩ
when controlling with the pin 32
FM S-meter signal.
VREF
A13571
28
A13572
VREF
32
29
+
1µF
A13573
Continued on next page.
No. 6655-11/54
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LA1787M.PDF ] | |
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