LV25300M Datasheet, PDF (2/4 Pages) Sanyo Semicon Device – Bi-CMOS IC 1-chip Tuner IC

LV25300M
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• Supports both FM Japan band and US band.
• AM first oscillator coil for AM LW, MW, and SW frequency divider circuit, internal frequency divider with
reduced number of varactor diode
• Weather band
FM IF
• IF limiter amplifier (IFAMP: Also runs in AM mode.)
• S-meter output (shared pin for AM), 6-stage pickup (VSM: for DSP)
• Dedicated FM S-meter (for DSP and diversity circuit)
• Coilless detector circuit
• Digital detection buffer output
• IF counter buffer output (also used for AM)
• SD (IF counter buffer ON level) adjustment
• SD output (active high) (also used for AM)
AM
• Double balance mixer (first and second)
• Elimimated IF amplification (AM 450kHz) AM IFT
• Digital detection IF buffer output (also used for FM)
• IF AGC (controlled by narrow band S-meter output)
• RF AGC (Wide)
• Pin diode drive pin (antenna damping)
• Wide band S-meter output (shared pin for FM IF)
• Narrow band S-meter output (detected by AM IF second amplifier)
• IF counter buffer output function (shared pin for FM IF), directly connected to PLL counter
• SD (IF counter buffer ON Level) adjustment
• SD output (active high) (also used for FM)
• AM noise canceller trigger output pin
PLL
• Charge pump for high-speed locking
• Internal FET for active LPF
• Low radiation noise due to 3V operation
• 4-wire serial bus control circuit (SANYO’s original CCB bus format)
• Reference divider
• Programmable divider (pulse swallow type)
• Crystal oscillator circuit
- FM band selection signal detection and control circuits
- AM, SW1, and SW2 reception
- Weather band
- AM/FM RF AGC voltage
- FM/AM RF DAC (9 bits × 2)
• ADC (6/8bits × 2, selectable)
Bus control circuit
Switching control
• AM/FM reception switching
• AM/FM RF AGC sensitivity setting: 4 bits
• FM keyed AGC control: 4 bits
• AM/FM RF tuning DAC (9 bits × 2)
• AM/FM SD control ON/OFF
• AM/FM IF counter output control ON/OFF
• AM oscillator 1 divider setting
• SEEK/receive mode switching
Automatic adjustment
• FM ANT tuning circuit fc control
• FM RF tuning circuit fc control
• AM/FM IF gain adjustment
• FM/AM W-AGC sensitivity adjustment
• FM/AM N-AGC sensitivity adjustment
• FM S-meter shift
• AM/FM SD sensitivity setting
• NULL adjustment
• AFC band width
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