LA1837 [SANYO]
Single-Chip Home Stereo IC with Electronic Tuning Support; 单芯片家用音响IC与电子调谐技术支持
| 型号： | LA1837 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Single-Chip Home Stereo IC with Electronic Tuning Support |
| 文件： | 总9页 (文件大小：256K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number : EN5688
Monolithic Linear IC
LA1837
Single-Chip Home Stereo IC with
Electronic Tuning Support
Overview
Package Dimensions
unit: mm
The LA1837 is a single-chip AM/FM IF and MPX IC that
supports electronic tuning and was developed for use in
home stereo systems. It is optimal for use in automatic
station selection systems that use the SD and IF counting
techniques.
3061-DIP30S
[LA1837]
Functions
AM:
RF amplifier, mixer, oscillator, IF amplifier,
detector AGC, oscillator buffer, S-meter, narrow-
band SD, IF buffer
FM IF: IF amplifier, quadrature detector, S-meter, S-
curve detector, IF buffer output
MPX: PLL stereo decoder, stereo display, forced mono,
VCO stop, post amplifier, audio muting, adjacent
channel interference rejection function
SANYO: DIP30S
Features
• On-chip MPX VCO (no external components required)
• Adjacent channel interference rejection function
(third and fifth order)
• Supports both the SD and the IF counting techniques.
•
•
•
The AM and FM SD sensitivities can be set independently.
The AM and FM output levels can be set independently.
Improved AM practical sensitivity and high-input
distortion characteristics
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
Conditions
Ratings
12
Unit
V
V
CC max
Pd max
Topr
Ta ≤ 70°C
550
–20 to + 70
–40 to +125
mW
°C
Tstg
°C
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating voltage range
Symbol
VCC
Conditions
Ratings
9
Unit
V
VCC op
7 to 11
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
82097HA(OT) No. 5688-1/9
LA1837
Electrical Characteristics at Ta = 25°C, V = 9 V, in the specified Test Circuit
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
[FM Mono Characteristics] fc = 10.7 MHz, fm = 1 kHz, with the coil adjusted so that VAFC – VREG = 0 V
Current drain
ICCO
With no input
18
31
1100
0
44
mA
mVrms
dB
-FM
Demodulation output
Channel balance
VO
FM
100 dBµ, 100% mod. The pin 16 output
100 dBµ, 100% mod. The pin 16 output/pin 17 output
100 dBµ, 100% mod. The pin 16 output
100 dBµ, 200% mod. The pin 16 output
100 dBµ, 100% mod. The pin 16 output
100 dBµ, AM 30 % mod. The pin 16 output
730
1460
+1.5
1.3
C.B-mono
THDFM(1)
THDFM(2)
S/NFM
–1.5
Total harmonic distortion (mono)
Total harmonic distortion (mono)
Signal-to-noise ratio
AM rejection ratio
0.3
1.0
80
%
5
%
72
45
dB
AMR
65
dB
100 dBµ, 100% mod. Referenced to the output.
The input such that the output is down –3 dB.
Limiting input voltage
–3 dBL.S.
26
32
38
dBµ
LED sensitivity
SDOn-FM
SDBW
51
85
80
0
60
120
120
0.1
4.3
85
69
170
160
0.5
dBµ
kHz
mVrms
V
LED bandwidth
100 dBµ
IF count buffer output
VIFBuff-FM
VSM-FM(1)
VSM-FM(2)
Mute-Att
100 dBµ. The pin 13 output
0 dBµ. The pin 11 output
100 dBµ. The pin 11 output
100 dBµ, 100% mod. The pin 16 output
S-meter output
3.6
75
5.0
V
Muting attenuation
dB
[FM Stereo Characteristics] fc = 10.7 MHz, 100 dBµ, fm = 1 kHz, L + R = 90%, Pilot = 10%
Separation (left)
SepL
SepR
L mod. The pin 16 output/pin 17 output
R mod. The pin 17 output/pin 16 output
The pilot modulation such that V7 is under 0.7 V.
The pilot modulation such that V7 is over 4.5 V.
L+R mod. The pin 16 output
30
30
45
45
dB
dB
%
Separation (right)
Stereo on level
STON
1.3
2.7
1.5
0.3
5
Stereo off level
STOFF
THD-main
%
Total harmonic distortion (main)
1.3
%
fs = 113 kHz, Vs = 90 %, Pilot = 10 %, The pin
Brej-3rd
Brej-5th
40
40
dB
dB
16 output vs. the L-R mod. 1 kHz demodulated output
Adjacent channel interference
rejection ratio
fs = 189 kHz, Vs = 90 %, Pilot = 10 %, The pin
16 output vs. the L-R mod. 1 kHz demodulated output
[AM Characteristics] fc = 1000 kHz, fm = 1 kHz
Current drain
ICCO-AM
VOAM(1)
With no input
15
100
200
18
25
180
320
22
35
360
500
mA
mVrms
mVrms
dB
23 dBµ, 30% mod. The pin 16 output
80 dBµ, 30% mod. The pin 16 output
23 dBµ, 30% mod. The pin 16 output
80 dBµ, 30% mod. The pin 16 output
80 dBµ, 30% mod. The pin 16 output
80 dBµ, 80% mod. The pin 16 output
Detector output
VOAM(2)
S/NAM(1)
S/NAM(2)
THDAM(1)
THDAM(2)
SDOn-AM
VOSC-AM
VIFBuff-AM
VSTIF-AM
VSM-AM
Signal-to-noise ratio
49
55
dB
0.4
1.0
27
1.2
4.0
37
%
Total harmonic distortion (mono)
%
LED sensitivity
17
110
160
16
dBµ
Local oscillator buffer output
IF counter buffer output
ST-IF output
With no input. The pin 30 output
80 dBµ, no modulation. The pin 13 output
80 dBµ, no modulation. The pin 7 output
0 dBµ, no modulation.
160
220
34
220
300
48
mVrms
mVrms
mVrms
V
S-meter output
0
0
0.2
Pd max – Ta
Ambient temperature, Ta – °C
No. 5688-2/9
LA1837
Block Diagram
3 rd 5 th
DECODER
ANTI-BIRDIE
Test Circuit Diagram
No. 5688-3/9
LA1837
Coil Specifications
· AM oscillator (for the DUT)
HW-50425 (Mitsumi Electric Co., Ltd.)
· IFT
YD-1073-1 (Mitsumi Electric Co., Ltd.)
➀- ➁
➃ - ➅
➁ - ➂
58T
7T
➂ - ➁
2T
➃ - ➅
➁ - ➀
QO ≥ 80
9T
94T
86T
f
= 450 kHz
O
Q
= 110
O
L = 270 µH
Includes an internal
180-pF capacitor.
SFU450B included.
· FM detector
600BEAS-9715Z (The Toko Electric Corporation)
➂ - ➀
22T
f = 10.7 MHz
QO = 40
Includes an internal
82-pF capacitor.
Pin Functions
Pin No.
Pin function
Pin voltage (V)
Pin description
Equivalent circuit
1
Vreg
FM IF input
Input impedance ri = 330 Ω
Connect the mixer coil between this pin and
VCC
2
3
AM mixer output
VCC
.
Also functions as the MPX regulator filter.
Vreg
FM IF input bypass
See pin 1.
AM IF input
GND
4
5
Vreg
0 V
Input impedance ri = 2 kΩ
Active low
Open collector output
AM stereo IF output (pin 7)
The current input must not exceed 150 µA.
TU - LED
ST - LED
AM-IF output
VCC
VCC
6
7
VCC
VCC
8
9
Recommended detector coil: 600BEAS-
9715Z
(The Toko Electric Corporation)
VCC
FM detector
Continued on next page.
No. 5688-4/9
LA1837
Continued from preceding page.
Pin No.
Pin Function
Pin voltage (V)
Pin description
Equivalent circuit
Recommended narrow band CF: BFU450
C4N (Murata Mfg. Co., Ltd.)
AM narrow band CF
connection
10
1.3 V
If the narrow band SD is not used, bypass
this circuit with a 50-Ω resistor and a 0.047-
µF capacitor connected in series.
11
12
13
14
15
FM S-meter output
0 V
0 V (AM)
0 V
RL = 8 kΩ
AM S-meter output
The AM SD sensitivity is adjusted with the
value of the external resistor connected
between this pin and ground.
AM SD sensitivity
adjustment
V13 ≤ 0.5 V: Reception state
AM and FM IF buffer
output, output control
switch (mute switch)
1.4 V ≤ V13 ≤ 2.2 V: IF buffer output turned
on
V13 ≥ 3.5 V: IF buffer output and muting are
turned on
Connecting this pin to ground through a
resistor sets the IC to AM mode.
Phase comparator
low-pass filter
V
CC – 1.4 (FM)
0 V (AM)
Resistor value limits:
2.7 kΩ (when VCC = 7 V)
(FM/AM switching)
3.9 kΩ (8 V) 5.1 kΩ (9 V)
6.2 kΩ (10 V) 7.5 kΩ (11 V)
If a current of 50 µA or greater flows from
this pin, the system is forced to mono.
Pilot detector low-pass
filter (forced mono)
(VCO stop)
Connecting this pin to ground stops the
VCO.
V
CC – 1.0
The resistor limit values are the same as for
pin 14.
Output impedance ro = 200 Ω
Pin 16: right output, pin 17: left output
Inverting inputs
16
17
18
19
Vreg
Vreg
Post amplifier input and
output
Pin 18: right input, pin 19: left input
R
NF = 33 kΩ
Output impedance ro = 3.3 kΩ
Pin 20: right de-emphasis
Pin 21: left de-emphasis
20
21
3.5 V
3.5 V
MPX output
Continued on next page.
No. 5688-5/9
LA1837
Continued from preceding page.
Pin No.
Pin Function
Pin voltage (V)
Pin description
Equivalent circuit
Input impedance ri = 20 kΩ
22
MPX input
2.9 V
Output impedance ro = 3.0 kΩ
2.8 V (FM)
2.8 V (AM)
The separation can be modified by inserting
a capacitor between this pin and ground.
23
24
25
FM demodulator output
AM detector output
AM AGC
Set VO sub/VO main to be about 0 dB.
Output impedance ro = 3.3 kΩ
The AM frequency characteristics can be
modified by adjusting the time constants of
the circuits between this pin and pin 22, and
between this pin and ground.
0 V (FM)
0.5 V (AM)
0 V (FM)
The built-in load resistor R = 11 kΩ.
0.5 V (AM)
The FM SD bandwidth can be modified with
the external resistor connected between
this pin and pin 28.
26
27
28
AFC
Vreg
Vreg
Vreg
AM RF input
Use this pin at the same potential as pin 28.
REG
Vreg = 3.6 V
Use an oscillator coil between this pin and
pin 28.
29
OSC
Vreg
The FM SD sensitivity can be modified with
the external resistor connected between
this pin and ground.
Oscillator buffer output,
FM SD sensitivity
adjustment
1.6 V (FM)
1.3 V (AM)
30
Output impedance ro = 20 Ω
No. 5688-6/9
LA1837
Overall FM Characteristics
FM THD/VSSMMCChhaararaccteterirsistitcicss
Input – dBµ
Iinput – dBµ
FM THD Band Characteristics
Distortion vs. Frequency Characteristics
Frequency, f – MHz
Frequency, freq – kHz
C
Separation vs. Frequency Characteristics
Adjacent Channel Interference Rejection Ratio
Referenced to the L-R
demodulated output.
Frequency, freq – kHz
Frequency, f – Hz
S
Capture Range Characteristics
SD Sensitivity Adjustment Characteristics
Pilot – mV
Rsdadj – kΩ
No. 5688-7/9
LA1837
SD Sensitivity Adjustment Characteristics
Overall AM Characteristics
Output
Radj – kΩ
Input – dBµ
AM THD/VSM Characteristics
AM Detector Output Frequency Characteristics (1)
Frequency, fm – kHz
Input – dBµ
AM Detector Output Frequency Characteristics (2)
Distortion vs. Ambient Temperature Characteristics
Frequency, fm – kHz
Ambient temperature, Ta – °C
Separation vs. Ambient Temperature Characteristics
Ambient temperature, Ta – °C
No. 5688-8/9
LA1837
■ 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:
➀ 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:
➁ 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.
This catalog provides information as of August, 1997. Specifications and information herein are subject to
change without notice.
No. 5688-9/9
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