Demodulation IC for Digital Terrestrial Receiver Applications:TC90527FG/TC90527WBG
Improved receiver sensitivity, smaller packages, lower power consumption and multi-band support
Toshiba has started sampling of a new demodulation IC designed for digital terrestrial receiver applications.
The new IC, designated the TC90527, consists of an OFDM demodulation and an error correction circuits compliant with ISDB-T and ISDB-TSB, digital terrestrial television and sound broadcasting standards. The Toshiba-original interference suppression circuit reduces the interfering signal produced by the reflected waves. The fading interference suppressing function*1 enables HDTV reception in moving vehicles at speeds exceeding 120 km/h.
Dual diversity reception*2 using two demodulation ICs further enhances the receiver sensitivity.
The TC90527 is available in two packages: an industry-standard QFP and a wafer-level chip-scale package called WCSP. The WCSP package is an ideal solution for small tuner module applications. The availability in different packages makes the TC90527 suitable for a wide variety of applications, including digital broadcast receivers such as digital televisions, recorders, portable televisions, set-top boxes and digital tuners, as well as compact devices such as note PCs, PC peripherals and handheld TVs.
- *1 : In a fast moving vehicle, its velocity causes a shift in the frequency of signals due to the Doppler effect. The difference in Doppler shifts among different signal components results in interference at the receiver, causing momentary fading. Fading suppression function is a technique for reducing such interference among signal components.
- *2 : In mobile reception, using multiple antennas lends itself well to improving the receiver sensitivity. The TC90527 can combine signal components received at two antennas using maximal-ratio-combining (MRC) diversity to improve the receiver sensitivity.
Background Information and Objectives
In Japan, analog terrestrial TV broadcasting will completely switch over to digital terrestrial broadcasting by July 2011. This transition is driving the need for inexpensive digital receivers. Additionally, thanks to the wide adoption of ISDB-T in South American countries, African and Asian countries are turning to ISDB-T. In these regions, the channel bandwidth is either 7 MHz or 8 MHz.
Features
- Improves the receiver sensitivity by 0.6 dB over the predecessor
Provides the industry-leading receiver performance thanks to a 0.6-dB*3 improvement over the predecessor. This helps expand the coverage of digital terrestrial broadcasting. - Industry's smallest package
Fabricated using the advanced 65-nm process, the demodulator chip is housed in the industry’s smallest package (which occupies approximately 50% board space of its predecessor). Thus, electronic manufacturers can reduce the size and thickness of digital products. - Approximately 30% reduction in power consumption, compared to the predecessor
Use of a newly designed A/D converter and other circuits has led to a 30% cut in power consumption. - Multi-band support
The TC90527 contains a variable-bandwidth digital filter. In addition to the 6-MHz channel bandwidth adopted in Japan and South American countries, the TC90527 can be used for applications targeted for countries with 7-MHz and 8-MHz channel bandwidths.
- *3 : Conditions: 64QAM, R = 3/4, Mode 3, G/I = 1/8)
General Specifications
| Part Number | TC90527FG | TC90527WBG |
|---|---|---|
| Supply Voltage | Internal core : 1.2 ± 0.1V, I/O : 3.3 ± 0.3V | |
| Package | LQFP48(7mm × 7mm × 1.4mm) | WCSP63(4.1mm × 4.1mm × 0.6mm) |
| Digital Terrestrial (ISDB-T) Demodulation and Correction |
· Supports all the 2 k/4 k/8 k carrier modes and three-layered transmission, including partial reception. · Identifies transmission mode (the number of carriers and the guard interval length) automatically. · Built-in Inter-Symbol Interference Canceller (ISIC) for reducing pre- and post-echoes longer than the guard interval. · Fast channel switching and channel search. · Built-in C/N, error rate and constellation monitor functions. · MPEG-2 transport stream outputs. · Supports I2C Fast-mode (400 kHz) and tuner I2C control. · Supports standby operation with wake-up control for emergency-alarm broadcasting. |
|
| Sampling | October 2010 | November 2010 |
| Mass Production | Q4, 2010 | |