View LA1805_158081.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Ordering number : EN2887B
Monolithic Linear IC
LA1805
AM/FM-IF/MPX Tuner System for Radio-Casette Recorders, Music Centers
Overview
Package Dimensions
The LA1805 is a characteristics-improved version of the unit : mm LA1810, with the same pin assignment and package as 3067-DIP24S those of the LA1810. Improvements are made on the following point : * Separation (35dB48dB) and its dependence on freerunning frequency (Sep - fF Characteristic on page 4). * FM main distortion (0.8%0.45%). * AM detection output (approximately 5dB increased). The constants on five external parts are changed as shown on page 10.
24
[LA1805]
13
7.62 6.4
1 21.2
12
Functions
* FM-IF : IF amp, quadrature detector, soft muting, tuning indicator. * MPX : PLL stereo decoder, stereo indicator, forced monaural, VCO stop. * AM :RF amp, MIX, OSC (with ALC), IF amp, detector, AGC, tuning indicator.
0.51min 3.3
3.25 3.9max
0.81
1.78
0.48
0.95
SANYO : DIP24S
Features
* FM/AM/MPX functions contained on a single chip. * Minimum number of external parts required. * On-chip FM muting function. * High sensitivity. * Less carrier leak of MPX.
Specifications Maximum Ratings at Ta=25C, See specified Test Circuit.
Parameter Maximum supply voltage Maximum supply current Flow-in current (Indicator drive current) Flow-out current Allowable power dissipation Operating temperature Storage temperature I23 Pd max Topr Tstg Pin 23 Ta70C 0.1 500 -20 to +70 -40 to +125 mA mW C C Symbol VCC max ICC max ILED Conditions Pins 3, 7, 8, 11, 20, 21 Pins 3+20+21 Pins 7, 8 Ratings 9 50 20 Unit V mA mA
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN 12798HA (KT)/D0994JN/4030MO/N148YT, TS No.2887-1/13
0.25
LA1805 Operating Conditions at Ta=25C
Parameter Symbol Conditions Ratings 4.5 3.0 to 8.0 Unit V V Recommended operating voltage VCC Operating voltage range VCC op
Note : The FM output level forms an N curve (LA1805) and an S curve (LA1806). LA1805 : N curve (for US band) LA1806 : S curve (for Japanese band). Your desired output level can be set by varying the output resistance.
Operating Characteristics at Ta=25C, VCC=4.5V, See Test Circuit
Parameter Symbol Conditions min Ratings typ max 13 28 140 0 70 23 32 2.4 205 0 0.45 80 33 48 0.45 3.9 2.7 No input VIN=23dB, 30% mod. VIN=80dB, 30% mod. VIN=23dB, 30% mod. VIN=80dB, 30% mod. VIN=80dB, 30% mod. VIN=100dB, 30% mod. IL=1mA 16 27 70 17 50 9.5 50 113 21 55 0.45 0.6 24 1.2 1.5 32 14.5 90 173 1.2 5.4 43 20 35 280 1.5 1.2 Unit
[FM characteristics (Mono) : fc=10.7MHz, fm=1kHz] Quiescent current -3dB sensitivity Demodulation output Channel balance Total harmonic distortion Signal to noise ratio LED ON sensitivity Separation Stereo distortion LED ON level LED OFF level Quiescent current Demodulation output Signal to noise ratio Total harmonic distortion LED on sensitivity Icco -3dBL.S. VO C.B. THD S/N VLED Sep THD (Main) VLED-on VLED-off Icco VO1 VO2 S/N1 S/N2 THD1 THD2 VLED No input Referenced to VIN=100dB, 100%, down 3dB VIN=100dB, 100% mod. VIN=100dB, 100% mod. VIN=100dB, 100% mod. VIN=100dB, 100% mod. IL=1mA mV dB % dB dB dB % % % mA mV mV dB dB % % dB mA dB
[FM characteristics (Stereo) : fc=10.7MHz, fm=1kHz, L+R=90%, pilot=10%, VIN=100dB]
[AM characteristics : fc=1000kHz, fm=1kHz]
Note : Be fully careful of dielectric breakdown.
Equivalent Circuit Block Diagram
No.2887-2/13
LA1805 Test Circuit
Polystyrene film capacitor Differs from the application circuit where a front end is used. (See Sample Application Circuit on page 10.)
How to use the LA1805
Unit (resistance : , capacitance : F)
1. Forced monaural mode. Figures 1 and 2 show how to cause the forced monaural mode to be entered. (1) Connect pin 14 to VCC through a resistor of 100k. (Turn ON the SW1 in Figure 1.) (2) Connect pin 15 to GND through a resistor of 47k. (Turn ON the SW2 in Figure 2.)
Figure 1 Forced Monaural Mode Setting Method
Figure 2 Forced Monaural Mode Setting Method
Forced Monaural Mode Setting Resistance FreeRunning Frequency
Free-running frequency - kHz
Either above-mentioned (1) or (2) causes the forced monaural mode to be entered. In this case, the VCO does not stop operating. If the resistance of R1 and R2 are decreased, internal bias will vary when the S1 or S2 is turned ON. This data is shown in Figure 3.
Figure 3
No.2887-3/13
LA1805
2. VCO Stop The VCO is so designed as to stop automatically at the AM mode. (when pin 11 and pin 21 are at the same potential) There is no pin available for stopping the VCO at the FM mode. However, the method shown right can be used to stop the VCO at the FM mode, causing the forced monaural mode to be entered.
Make the wiring as short as possible.
3. Free-running frequency measurement and adjustment Either of the following two methods is used to measure the free-running frequency. (1) Connect pin 13 to a frequency counter through the high input impedance amplifier. (2) Connect the connection point of the semifixed resistor connected to pin 13 and the fixed resistor to a frequency counter through the resistor of 240k or greater.
Figure 4
Figure 5
Figure 6 How the error changes with the resistor value is shown in Figure 7.
Measured error, f - %
IF input 100dB Nonmodulation Resistor value, RX - k
Figure 7 * When setting the free-running frequency, the following must be noted. Apply a 10.7MHz 100dB nonmodulation carrier as IF input signal and set to 76kHz50Hz with the tuning indicator lighted. 4. Separation setting capacitor Cs The separation characteristic for the LA1805 alone (IF input) differs from that for the antenna input with a front end. This difference is caused by the characteristics of the front end and ceramic filter. Shown right is how the separation characteristic changes with the separation setting capacitor value when the LA1186N is used as front end. Referring to this separation characteristic, choose the optimum separation for your set model.
Separation, Sep - dB
Free-running frequency, fF - kHz
Figure 8
No.2887-4/13
LA1805
5. FM muting pin The external resistor connected to pin 12 can be used to vary the muting level (Figure 9). The abnormal sound at the time of side peak reception at the FM mode can be reduced by weak signal muting.
LA1186N+LA1805 Muting Characteristics LA1186N+LA1805 Attenuation - Detuning Frequency
Noise, Output - dBm
Noise
Input - dB
Detuning frequency, f - kHz
Figure 9 Figure 10 6. The following method can be used to change the LED ON sensitivity at the FM mode (Figure 11). The data on the LED ON sensitivity setting resistance and LED ON sensitivity is shown in Figure 12.
LED ON Sensitivity - R
Figure 11 Method to Change the LED ON Sensitivity at the FM Mode
Unit (capacitance : F)
LED ON sensitivity - dB
Reference (R=Open) Resistance, R -
Figure 12 7. AM-FM selection The FM mode is entered with pin 11 open as shown in Figure 13. When pin 11 and pin 21 are made to be at the same potential in terms of DC, the AM mode is entered. It should be noted that the dynamic range is narrowed whether the potential at pin 11 is lower or higher than that at pin 21. Figure 13 8. If a noise appears in the detection output when the tuning LED goes ON at the AM mode, connect a capacitor across pin 8 and GND to eliminate the noise.
Attenuation - dB
No.2887-5/13
LA1805
FM Characteristics Total harmonic distortion, THD - % AM Characteristics Total harmonic distortion, THD - % Noise, Detection output - dBm Demodulation output
Noise, AM output, Demodulation output - dBm
Detection output
AM outp
ut
No
ise
Noise
Input - dB Selectivity Characteristic Output 20mV const.
Input - dB/m Fidelity Characteristics input const. Total harmonic distortion, THD - % Modulation frequency - Hz MW Reception Characteristic Tracking at each frequency
IF interferen ce
Detuning frequency, f - kHz Whistle Characteristic
tput (1kHz30% mod)
Attenuation - dB
Detection ou
Ma
Sensitivity - dB/m, Interference ratio - dB
Detection output, Whistle output - dBm
Response - dB
x. w
hist
le (
2f1
)
Image interfe frequency rence Usable sensitivity
Max. sensitivity (1kHz-30% mod, output=20mV)
Input - dB/m
Receiving frequency - kHz
No.2887-6/13
LA1805
FM VCC Characteristics Total harmonic distortion, THD - % Sensitivity - dB/m AM VCC Characteristics Total harmonic distortion, THD - %
mod
Demodulation output Detection output - dBm
Detection output - dBm
Detection output (100% mo
d)
Sensitivity - dB
Max. sensitivity (output=20mV, 30% mod)
LED ON sensitivity
LED ON sensitivity THD (100% mod) Supply voltage, VCC - V
Supply voltage, VCC - V Total harmonic distortion, THD - % Output - dBm Sensitivity - dB S/N - dB Output - dBm Temperature Characteristics Total harmonic distortion, THD - %
FM Temperature Characteristics
Demodulation output, input=10 0dB
Detection output, input=60dB
THD, input=10
Input S/N, input=60dB
0dB , 1kHz-30
% mod
S/N, input=100dB
THD, input=100dB Sensitivity - dB
LED ON sensitivity
S/N=20dB sensitivity, 1kHz-30%
LED sensi
tivity
Output 20mV sensitivity, 1kHz-30% mod Ambient temperature, Ta - C Lamp ON Sensitivity - VCC
Ambient temperature, Ta - C
Pilot modulation - %
Pilot level - mV
ON level
OFF level
Capture range - % IF input Nonmodulation
Supply voltage, VCC - V
Separation, Sep - dB
IF input 100dB
Supply voltage, VCC - V
Supply voltage, VCC - V
No.2887-7/13
LA1805
Total harmonic distortion, THD - %
IF input 100dB (10.7MHz) Separation, Sep - dB
IF input 100dB
Supply voltage, VCC - V
Frequency, f - Hz
Total harmonic distortion, THD - %
IF input 100dB
Total harmonic distortion, THD - %
IF input 100dB
Frequency, f - Hz Carrier Leak - VCC Free-running frequency drift, f - %
Modulation, Dev. - kHz Free-Running Frequency Drift Characteristic
without de-emphasis carrier leak
IF input 100dB Nonmodulation
Carrier leak - dB
carrier leak
Stereo (pilot modulation) with de-emphasis
carrier leak
IF input 100dB 0dB : mono output level Supply voltage, VCC - V SW2 Characteristics
Ambient temperature, Ta - C SW2 Characteristics Noise voltage, Detection output - dBm
Total harmonic distortion, THD - %
n ou Detectio
tput (30
% mod)
Pin4 voltage, V4 - V
No
ise
Adjust so that THD is minimized.
IEC input - dB
IEC input - dB
No.2887-8/13
LA1805
SW2 Characteristic Pin 24 voltage Oscillation voltage, VOSC - % Interference ratio - dB Sensitivity - dB SW2 Characteristics
Usable sensitivity
Max. sen
sitivity
Im inte age fr rfer equ enc enc y e
Receiving frequency, fr - MHz
Receiving frequency, fr - MHz
SW Band Test Circuit
Unit (capacitance : F) T1 : YT-30117 (Mitsumi), 2158-4095-319A (Sumida) T2 : HW-40184 (Mitsumi), 0237-1500 (Sumida)
LW Characteristics Noise output, Detection output - dBm Total harmonic distortion, THD - %
LW Characteristics
Pin 4 voltage, V4 - V
Demodu
lation ou
tput
ANT input - dB/m LW Characteristics Sensitivity - dB/m Interference ratio - dB
No ise
ANT input - dB/m
LW Band Test Circuit
Oscillation voltage, VOSC - mV
Us sen able siti vity
n freque Image rence rfe inte
cy
Max. se
nsitivity
(Mitsumi) (Mitsumi)
Receiving frequency, fr - kHz
Unit (capacitance : F)
No.2887-9/13
LA1805
Sample Application Circuit : LA1186N+LA1805 FM/MW
(Mitsumi) (Mitsumi) (Mitsumi)
Note : The constants of parts *1 to *5 are changed from those of the LA1810.
(Mitsumi) (Mitsumi) (Mitsumi) (Mitsumi)
No.2887-10/13
Unit (resistance : , capacitance : F)
LA1805 Sample Printed Circuit Pattern (See Sample Application Circuit.)
(Cu-foiled area) Unit (resistance : , capacitance : F) LA1186N + LA1805 Over Characteristics Detection output, Noise voltage - dBm Total harmonic distortion, THD - % LA1186N + LA1805 Over Characteristics
Detection output
AM output
Noise voltage
ANT input voltage - dB
ANT input voltage - dB
Differences between LA1805 and LA1806 (1) Same pin assignment (2) The internal circuit of the MPX OUT (pin 9, pin 10) is different as shown below. The FM S curve at pin 17 is in the opposite direction and the circuit in which AFC is provided is the same for the US band and Japanese band.
The LA1805 contains the output load resistors (Output load resistance=6.8k)
For the LA1806, output load resistors RL, RR are connectedxternally. The graph of demodulation output vs. RL (RR) is shown below. No.2887-11/13
LA1805
LA1806 FM Characteristic
Demodulation output - mVrms
External load resistance, RL - k
Coil Specifications
* MW bar antenna TN-10896 (Mitsumi)
* AM IFT HW-6215 (Mitsumi)
HW-6194 SFU-450B
* MW OSC HW-6193 (Mitsumi)
* FM quadrature YT-30103 (Mitsumi)
* SW2 OSC HW-40184 (Mitsumi)
0237-1500 (Mitsumi)
* SW2 ANT YT-30117 (Mitsumi)
2158-4095-319A (Sumida)
* LW bar antenna HH-50161 (Mitsumi)
* LW OSC MA-7014 (Mitsumi)
No.2887-12/13
LA1805
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 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 January, 1998. Specifications and information herein are subject to change without notice.
No.2887-13/13

▲Up To Search▲

Price & Availability of LA1805

	To Download LA1805 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .