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TDA8575T Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA8575T Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 16 page  1996 Jul 29 5 Philips Semiconductors Preliminary specification Ground noise isolation amplifier TDA8575 FUNCTIONAL DESCRIPTION System description To enable a high common mode rejection a new system setup is used. The voltage to current converter, referred to as V → I in the block diagram of Fig.1, replaces the resistors that can be seen in the conventional system solution. Both systems are shown in Figs 4 and 5. In the conventional system the common mode rejection is limited by the matching properties of the resistors resulting in a CMRR of 60 dB maximum. Using the new system setup a CMRR of 80 dB is achieved. Power on In Fig.6 the preferred input capacitor values are shown. If the capacitor C2 = 22 µF connected to the IN- inputs had to be charged by the 0.5Vcc voltage source a charge time of would be required. 5 τ 5 360 k Ω 2 ------------------- × 22 µF × 20s = = This is inconvenient for most applications and therefore the TDA8575(T) is equipped with a quick charge circuit. On power-on the quick charge circuit charges the capacitor C2 connected to the IN- pins. The quick charge circuit consists of a voltage buffer and a control circuit (referred to as ‘reference and power check’ in Fig.6) that monitors the supply voltage VCC. If the supply voltage rises more than ≈ 2 V the voltage buffer is switched on. After charging C2 the voltage buffer is switched off. The charge time of C2 will equal the charge time of C4, the SVRR capacitor. Fig.4 Conventional system. handbook, halfpage MGE830 Vo Vi 0.5 VCC Fig.5 New system using V → I converters. handbook, halfpage 0.5 VCC Vo Vi V I I V MGE831 |
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