Features: · Low impedance gain controlled RF input· Dual matched double balanced mixer· Digital generation of 00/900 LO signal· Direct down conversion from 1. IF (LNB output) to base band 0-30 MHz· IF filter not necessary· I / O for external baseband filter· CMOS PLL-Synthesizer· Active loop filte...
TUA6100B6: Features: · Low impedance gain controlled RF input· Dual matched double balanced mixer· Digital generation of 00/900 LO signal· Direct down conversion from 1. IF (LNB output) to base band 0-30 MHz· ...
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Parameter | Symbol |
Limit Values |
Units | |
min. | max. | V | ||
Supply voltage | VVCC | - 0.3 | 5.5 | V |
Supply voltage 1 | VVCC1 | - 0.3 | 5.5 | V |
Crystal oscillator | VQOSZ | VVCC-3 > 0 | VVCC-1 > 0 | V |
Crystal oscillator buffered output | VXTALOUT | 0 | VVCC | V |
Synthesizer Charge pump out Loop filter in | VPDLOOP | 0 | VVCC | V |
Synthesizer Loop filter tuning output | VTUNE | -0.3 | 35 | V |
VCO inputs | VOB1,VOB2 | 0 | VVCC | V |
Port outputs | VP0,P1,P2 | 0 | VVCC | V |
IP0,P1,P2 | 15 | mA | ||
IP0,P1,P2 | 30 | mA | ||
Port outputs , VP0,P1,P2= VVCC, I=max | t Imax | 1 | mS | |
GHz-PLL Charge pump out | VPDOUT | 0 | VVCC | V |
Baseband outputs I / Q | VIOUT ,QOUT | 0 | VVCC1 | V |
IIOUT , QOUT | 4 | mA | ||
Baseband filtered inputs I / Q | VIFIN,VQFIN | 0 | VVCC1 | V |
Baseband filtered Output I / Q | VIFOUT,QFOUT | 0 | VVCC1 | V |
IIFOUT,QFOUT | 4 | mA | ||
AGC voltage | VAGC | 0 | VVCC1 | V |
RF input | VRFINX,RFINY | 0 | 1.5 < VVCC1 | V |
I2C / 3-Wire-Bus | SCL, SDA,CAS BUSMODE |
- 0.3 |
VVCC+0.3 | V |
The TUA6100B6 is a low cost chip in the newest Infineon high speed BICMOS technology B6HFC. It is designed to implement the direct conversion receiver principle for digital QPSK-Sat receiving systems.
The DCR architecture eliminates the need for expensive RF-Filters for image rejection and IF-Frequencies for channel selection. Instead, an inexpensive base band low-pass filter is used for channel selection, and no image rejection filter is required.
These base band filter enable the possibility for an on chip integration. (not part of TUA6100) The DCR system is the most promising architecture to lower the cost of digital set-top boxes front end.
Via a gain controlled RF preamplifier (not part of TUA6100) with approx. 30 dB gain and some selectivity, the RF signal is symmetrical fed to two low input impedance double balanced mixers .
The mixers have common inputs with internal power splitting and incorporate a new patented direct gain control in the mixer input stage and an additional gain control at the mixer output to improve S/N ratio.The signal of the synthesizer tuning VCO is multiplied to 4 x RF input frequency via a complete internal 3.8-8.6 GHz PLL system.
To drive the mixers, this 3.8-8.6 GHz signal is split into quadrature components by a Johnson-counter /4.The mixers are followed by 2 matched 16 dB fixed gain base band amplifiers making available the first linear DC-coupled base band outputs with approx. 224 mVpp for the I and Q signal .
Two additional 16 dB fixed gain base band amplifiers with approx. 1 Vpp output voltage enable the possibility to use system adapted external AC-coupled base band filter and eliminate undesirable DC-components of the first amplifiers .