la1136nm Sanyo Semiconductor Corporation, la1136nm Datasheet - Page 11

• Manufacturer Part Number: la1136nm
• Description: Am Tuners For Car Radios And Home Stereos
• Manufacturer: Sanyo Semiconductor Corporation

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