Terrestrial Digital One-Segment Chipset
Miniature reception modules with low power consumption that achieve stable reception under rapidly changing conditions are required for cell phones and other portable terminals. SANYO has established independently developed diversity synthesis technology and the industry’s first direct conversion technology that together meet these requirements.
NTSC/PAL Video Encoder
This IC makes it possible to display the cell phone’s LCD screen contents or image data that was taken with the camera and is stored in the camera’s memory on a TV (video input).
LNA | Frequency conversion (LA8101) |
| LPF |
| π/2 |
UHF Ant. | LPF |
ODFM demodulation LSI (LC74112)
A/D |
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A/D | demodulator | OFDM | Deinterleave |
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Baseband |
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| processor |
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processor |
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| LPF |
LNA | π/2 |
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A/D |
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Memory
Flash
| LC822961 |
LC822971 |
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Frame | LC822961 |
memory | equivalent |
PLL |
| OSC |
Direct conversion technology adopted | Diversity synthesis technology adopted | |
→ No SAW filter is required, making | ||
→ Makes stable reception possible | ||
further miniaturization possible | ||
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Due to the adoption of direct conversion technology
Large external components such as a SAW filter are not required
Image cancellation using analog circuits is no longer required, and at the same
time as reducing the size of the circuit and the power consumption, circuit performance does not degrade over time or due to temperature fluctuations.
This approach achieves antenna diversity,
which is effective at improving reception performance.
Cell Phone Video Drivers
Video driver
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● No output coupling capacitors required | ● | |||
● | ● Standby mode power consumption: 0 ∝A | |||
● Voltage sag does not occur | ● The amplifier gain can be selected (6, 9, or 12 dB) | |||
Low: | 6dB |
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GAIN_CTL High: | 9dB | VCC |
Open: 12dB |
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3 | CLAMP | LPF | AMP |
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| GND 5 |
| Generator |
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| ND1 | VCC_N | P_SAV_CTL | |
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| Low: | Active |
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| High: | Stanby |
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| Open: | Stanby |
memory 
NTSC/PAL Encoder
LC822961
| LC822963 |
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Converts base band processor generated video and provides other functions for TV output.
●Miniature package (CSP42: 3.3 ⋅ 3.78 mm2)
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●Supports a wide variety of input data rates
●The LC822963 is an MCP package version of the LC822961 audio operational amplifier (LA6358N).
●Application examples: TV games, video players
NTSC/PAL Encoder with
| LC822971 |
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Data written to memory can be continuously output to a TV without being sequentially updated using the internal frame memory.
Once the data has been written it can be displayed with essentially no load on the microcontroller.
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●Rotation processing (at write), enlargement processing (at display)
●The NTSC/PAL encoder block is the same as that in the LC822961.
●Application examples: Photograph album shows, business presentation tools
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| (5 Mbits) |
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| 75 Ω driver | Composite | |||||||
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| video output | |
CTL bus |
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| DRAM |
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| H/V filter |
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| CPU I/F |
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| H/V ccalar |
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| Data |
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| Timing |
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| video encoder |
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| Display writer |
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| LC822961 |
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22 |
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