Tuner IC
LA79106V
Overview
The LA79106V is a voltage synthesized tuner IC that integrates mixers for three bands (VHF (low), VHF (high), and UHF) and an oscillator circuit on a single chip.
Functions
Double balanced mixer (base input): VHF (low)
Double balanced mixers (emitter input): VHF (high) and UHF
Lo output pin
Supply voltage: VCC = 5 V
Package: SSOP24 (275 mil)
Block Diagram
UOSC1 | VLOSC1 | UOSC2 | VLOSC2 | UOSC3 | VHOSC1 | UOSC4 | VHOSC2 | VHOSC3 | GND | IFOUT1 | IFOUT2 |
24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 |
|
|
| VHFL |
| UHF |
| VHFH |
|
|
|
|
|
|
|
|
|
|
|
| REG |
|
|
|
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
IFT1 | IFT2 | GND | UIN1 | UIN2 | VLIN | VHIN1 | VHIN2 | CC | OSCOUT1 | OSCOUT2 | BANDSW |
V |
Tuner IC
LV4512V
Overview
The LV4512V integrates local oscillator circuits for the VHF and UHF bands, mixers, an IF amplifier, and a PLL circuit for tuning on a single chip. It is controlled using an I2C bus.
Functions
PLL circuit for tuning
I2C bus control
Frequency steps (31.25, 50, and 62.5 kHz when a reference frequency of 4 MHz is used)
Four
Can be controlled at any one of four I2C bus addresses
Supply voltage: VCC = 5 V
Package: SSOP30 (275mil)
Block Diagram
3 |
| 4MOSC | CPO |
|
| REG3 | IFOUT | GND2(PLL) | 2(PLL) | UOSCB2 | UOSCE2 | UOSCE1 | UOSCB1 | VOSCC2 | GND1B | VOSCC1 |
CC |
|
| CPE | CC | ||||||||||||
V |
|
| V | |||||||||||||
30 |
| 29 | 28 |
| 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
|
| Ref OSC | Lock |
| Charge | Pump |
| 3V MOS | REG |
| UHF | OSC |
| VHF | OSC |
|
| 1/512,640,1024 | Phase | Det | SW |
| Programable DIV |
|
|
|
|
|
|
|
|
| |
| S/R |
|
|
|
|
|
| 16/17 | 1/8 |
|
|
|
|
|
|
|
C | BUS | I/F |
|
|
|
|
|
| REG |
|
|
|
|
|
|
|
2 |
|
|
|
|
|
|
|
|
|
|
|
|
| |||
I |
|
|
|
|
|
|
|
|
|
|
|
|
| |||
1 |
| 2 | 3 |
| 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
SCL |
| SDA | ADR |
| FMT | BVL | BVH | BU | 1 | Mixout1 | Mixout2 | GND1A | VHFin1 | VHFin2 | UHFin1 | UHFin2 |
|
| CC | ||||||||||||||
|
| V | ||||||||||||||
41 SANYO TV . VCR | SANYO TV . VCR 42 |
