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Single-Chip FM/AM Tuner for Car Radio and Home Stereo Equipment

Overview
The LA1837M is a Single-Chip AM/FM Tuner IC that provides AM and FM IF and multiplex decoding circuits for electronic tuning and was developed for use in Home Stereo Systems. It provides both SD and IF counting techniques for optimal implementation of automatic station selection.

Features
• On-chip MPX VCO circuit (no external components required).
• Adjacent channel interference rejection function (third order and fifth order).
• Supports both the SD and IF counting technique (built-in SD speedup function).
• The AM and FM SD sensitivity can be set independently.
• The AM and FM output levels can be set independently.
• Improved basic FM reception performance.

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, SD, S curve detection, IF buffer output
• Multiplex Stereo decoding: PLL Stereo decoder, Stereo indicator, forced monaural, VCO stop function, post amplifier, audio muting, adjacent channel interference rejection function

Overview
The LA1837M is a Single-Chip AM/FM Tuner IC that provides AM and FM IF and multiplex decoding circuits for electronic tuning and was developed for use in Home Stereo Systems. It provides both SD and IF counting techniques for optimal implementation of automatic station selection.

Features
• On-chip MPX VCO circuit (no external components required).
• Adjacent channel interference rejection function (third order and fifth order).
• Supports both the SD and IF counting technique (built-in SD speedup function).
• The AM and FM SD sensitivity can be set independently.
• The AM and FM output levels can be set independently.
• Improved basic FM reception performance.

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, SD, S curve detection, IF buffer output
• Multiplex Stereo decoding: PLL Stereo decoder, Stereo indicator, forced monaural, VCO stop function, post amplifier, audio muting, adjacent channel interference rejection function

Overview
The LA1827M is a Single-Chip Tuner IC for FM and AM with built-in MPX-VCO which requires no adjustment and no external parts.

Features
• Single-Chip Tuner with AM, FM-FE/FM-IF, MPX circuitry
• Built-in adjustment-free MPX-VCO (noceramic oscillator required)
• FM-DET, adjustment-free (using ceramic deicriminator)
• Reduced FM-FE oscillation level
• FM Stereo indication and AM/FM tuning indication pins provided

Functions
• AM : RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, tuning display output
• FM-FE : RF amplifier, mixer, oscillator
• FM-IF : IF amplifier, quadrature detector, signal strength meter, tuning display output
• MPX : PLL Stereo decoder, Stereo display output, forced mono, internal VCO

Overview
The LV23200T is a one-chip Tuner IC incorporating PLL for Home Stereo system.

Features
• Tuner IC and PLL IC integrated into one chip.
• MPX-VCO incorporated and without need of adjustment.
• FM/AM output level independent setting possible.
• MOS transistor for active LPF incorporated.

Functions
• AM Tuner Changeover of the constant in RFAMP, MIX, OSC, IF AMP,
   DET, AGC, SD, OSC BUFF, IF BUFF, and AGC modes.
• FM Tuner 1stIFAMP, IF limiter AMP, DET (COIL type) , S-METER, SD, AFC, IF BUFF.
• MPX PLL Stereo DECODER, forced MONO, AUDIO MUTE, function to prevent
   interference from a neighboring station, PILOT canceling function.
• PLL frequency synthesizer.

Overview
The LA1838 is designed for use in Home Stereo Systems and is a Single-Chip Tuner IC that provides electronic tuning functions for AM, FM IF, and MPX reception. It is optimal for use in products that adopt an automatic tuning system based on an IF count.

Features
• Integrated MPX VCO (External components are no longer required.)
• Built-in adjacent channel interference rejection function (third and fifth order)
• Adjustment-free FM detector circuit (Uses a ceramic discriminator.)
• The AM and FM SD sensitivities can be set independently.
• The AM and FM output levels can be set independently.
• Improved useable AM sensitivity and strong field distortion characteristics.

Overview
The LV23014T is a Single-Chip Tuner IC with built-in PLL for mini component, receiver.

Functions
 AM Tuner
 FM Tuner
 MPX Stereo decoder
 PLL frequency synthesizer

Overview
The LV23015T is a Single-Chip Tuner IC with built-in PLL for mini component, receiver.

Functions
• AM Tuner
• FM Tuner
• MPX Stereo decoder
• PLL frequency synthesizer

Overview
The LA1828 is a Single-Chip Tuner IC for FM and AM with built-in MPX-VCO which requires no adjustment and no external parts.

Features
•Single-Chip Tuner with AM, FM-FE/FM-IF, MPX circuitry
•Built-in adjustment-free MPX-VCO (noceramic oscillator required)
•Reduced FM-FE oscillation level
•FM Stereo indication and AM/FM tuning indication outputs can directly drive LEDs

Functions
•AM :  RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, tuning display output
•FM-FE :  RF amplifier, mixer, oscillator
•FM-IF :  IF amplifier, quadrature detector, signal strength meter, tuning display output
•MPX :  PLL Stereo decoder, Stereo display output, forced mono, internal VCO

Overview
The LA1824 is a Single-Chip Tuner IC that incorporates FM/AM and MPX circuits.
The built-in MPX-VCO allows this IC to be adjustment free and to require no external components.

Features
• FM, AM and MPX integrated in a Single-Chip.
• Adjustment free MPX-VCO
   : No ceramic resonator used.
• FM front-end : Local OSC voltage reduced.
• FM Stereo and FM/AM tuning indicator output provided.
• Package : DIP-24S.