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LA1137NM View Datasheet(PDF) - SANYO -> Panasonic

Part Name
Description
Manufacturer
LA1137NM
SANYO
SANYO -> Panasonic SANYO
LA1137NM Datasheet PDF : 28 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
LA1136N, 1136NM, 1137N, 1137NM
LA1136N, LA1137N Pin Specifications (Pins connected to an external microcontroller)
(1) IF Band Switching : Pin 12
Narrowband : 3.5 V or greater
Wideband : 2.1 V or lower
(2) Seek Detection : Pin 14
Station seek : 3.5 V or greater
Receive mode : 1.5 V or lower
(3) IF Count Buffer : Pin 17
IF count buffer enabled : 2.5 V or greater
IF count buffer disabled : 1.2 V or lower
(4) SD output, tweet prevention control pin: Pin 22
The function of pin 22 is determined by the control voltage on pin 14 as follows:
[Pin 14]
[Pin 22]
HIGH (3.5 V or higher) SD output pin (active high)
LOW (1.5 V or lower)
Tweet prevention input pin
Microcontroller control voltage, Tweet prevention
HIGH (3.5 V or higher) off
LOW (1.5 V or lower) on
Note: It is necessary to modify the microcontroller specifications in order to implement tweet prevention. When a
conventional microcontroller is used with the LA1136N or the LA1137N, the tweet prevention circuit does not operate,
but all other functions operate independently.
Device Comparison
Comparison between LA1135, LA1136N and LA1137N
Parameter
LA1135
LA1136N
LA1137N
Packages
DIP20S, MFP20
DIP24S, MFP24
DIP20S, MFP20
Double-balanced mixer
Yes
Yes
Yes
Oscillator
LW to SW
Supports AM stereo in LW
and MW, low-band noise reduction
LW to SW
Local-oscillator buffer
Yes
Yes
Yes
IF amplifier
Yes
Yes
Yes
Detector
External capacitor
Internal capacitor
Internal capacitor
IF-band switching
No
Yes
No
S-meter linearity
Approximately 80 dBµ
Approximately 100 dBµ
Approximately 100 dBµ
Active-HIGH stop detector output No (requires 2 transistors)
Yes
Yes
Stop detector sensitivity
S-meter load dependent Set by external resistor (Pin 10) Set by external resistor (Pin 9)
IF count buffer
No (requires 2 transistors)
Yes
Yes
AM stereo buffer
No
Yes
No
IF AGC
Yes
Yes
Yes
IF AGC time-constant switching No (requires 1 transistor)
Yes
Yes
IF AGC reset
No
Yes
Yes
Wideband RF AGC
Yes
Yes
Yes
RF AGC time-constant switching
No
Yes
Yes
Antenna dumping
Transistor
Pin-diode
Pin-diode
Tweet prevention
No
Yes
Yes
No. 3507-11/28
 

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