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IC Decap – TDA3606 Multi Regulator With Battery Sense

This is a chip aimed at the automotive market – this is a low power voltage regulator for supplying power to microcontrollers, for instance in a CD player.

TDA3606 Die
TDA3606 Die

The TDA3606 is a voltage regulator intended to supply a microprocessor (e.g. in car radio applications). Because of low voltage operation of the application, a low-voltage drop regulator is used in the TDA3606. This regulator will switch on when the supply voltage exceeds 7.5 V for the first time and will switch off again when the output voltage of the regulator drops below 2.4 V. When the regulator is switched on, the RES1  and RES2 outputs (RES2 can only be HIGH when RES1 is HIGH) will go HIGH after a fixed delay time (fixed by an external delay capacitor) to generate a reset to the microprocessor. RES1 will go HIGH by an internal pull-up resistor of 4.7 kΩ, and is used to initialize the microprocessor. RES2 is used to indicate that the regulator output voltage is within its voltage range. This start-up feature is built-in to secure a smooth start-up of the microprocessor at first connection, without uncontrolled switching of the regulator during the start-up sequence. All output pins are fully protected. The regulator is protected against load dump and short-circuit (foldback
current protection). Interfacing with the microprocessor can be accomplished by means of a battery Schmitt-trigger and output buffer (simple full/semi on/off logic applications). The battery output will go HIGH when the battery input voltage exceeds the HIGH threshold level.

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IC Decap – TA7291 H-Bridge DC Motor Driver

Here’s a jellybean chip – a DC motor driver. This device has all the logic to drive a small motor, such as that used to drive the tray of a CD drive in both directions. The control logic is at the bottom of the die, while the main power transistors are at the top, in H-Bridge formation.

TA7291 Die
TA7291 Die
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IC Decap – MaxLinear MXL261 DOCSIS3 Tuner / Demodulator

Time for more silicon pr0n! When Virgin Media supplied me with a new modem, they requested I “recycle” the old one, so naturally it got gutted for the component parts. This particular IC is the frontend of the RF tuner. Unfortunately no datasheet is available, but I did manage to find some info in a press release. The sections are clearly identifiable, the RF section is on the left, while the rest of the demodulating logic is hidden on the right under a metal layer.

MXL261 Die
MXL261 Die – Click to Embiggen!

The MxL261 is based on MaxLinear’s low-power, digital CMOS process RF and mixed-signal technology.  It is a single-die, global standards, digital cable front end with integrated splitter, two 100MHz wideband tuners, four QAM demodulators and a four-channel-wide IF output.