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TDA8785H Arkusz danych(PDF) 6 Page - NXP Semiconductors |
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TDA8785H Arkusz danych(HTML) 6 Page - NXP Semiconductors |
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6 / 24 page  1997 Dec 18 6 Philips Semiconductors Product specification 8-bit high-speed analog-to-digital converter with gain and offset controls TDA8785 FUNCTIONAL DESCRIPTION The TDA8785 is composed of an 8-bit ADC (30 Msps), a wide-band gain amplifier, an input offset amplifier and an 8-bit dynamic adjustment DAC. Input signal Two input pins are provided to apply a differential input signal with a wide range (100 to 1000 mV differential). It is also possible to apply a single signal by setting a DC voltage on one of the differential pins and supplying the signal to the other. Controlled gain amplifier The gain amplifier is used to adjust the wide input signal range to the fixed ADC input range of 1 V (p-p). A large gain of 20 dB can be achieved with low-noise behaviour and a large bandwidth of 100 MHz to correctly amplify square type signals with step edges. Using pin 6, it is possible to reduce the internal bandwidth of the gain amplifier via an external capacitor and thus improve its noise behaviour. The gain amplifier is controlled via an external differential voltage (single input can also be applied). Input offset amplifier and adjustment DAC The Input offset amplifier contains two different control inputs (which can also be single): • Slow offset control, for slow variation characteristics (e.g. temperature, supply voltage, etc.) • Fast offset control, for correction related to the clock rate. Slow offset control is carried out by an external voltage while fast offset control is digitally carried out via the internal 8-bit DAC with external connections of the respective pins VDACO(n), VDACO(p), VFOFF(n) and VFOFF(p). The internal 8-bit DAC operates at the ADC clock rate to allow dynamic corrections on the input signal chain based on the signal processing information carried out after the digital conversion. The output voltage amplitude of the DAC can be controlled via a different input voltage (which can also be single) in a range of ±25% with a 150 Ω DAC output load. The DAC can also be used for the gain or the slow offset control with some external DC voltage adaptations and can be considered as a separate function of the ADC chain. The DAC can be used independently, for example as a video DAC. 8-bit ADC The 8-bit ADC converts a signal of 1 V (p-p) from the controlled gain amplifier into an 8-bit coded digital word at a maximum rate of 30 Msps. Its reference voltage is supplied by the general voltage regulator. The output data format can either be binary, two’s complement or 3-state by selecting pin OF. When all the differential inputs on the offset amplifier (VSOFF(p), VSOFF(n), VFOFF(n), VFOFF(p), Vi(p) and Vi(n)) are at 0 V (equivalent to both inputs short-circuited), the output code of the ADC is code 8. Internal voltage regulator An internal voltage regulator provides all the references for the different blocks. A stable 2.75 V voltage reference output is provided for use in the application environment. One application is to connect all the slow control inputs (VFSDAC(p), VFSDAC(n), VSOFF(p), VSOFF(n), VFSAD(p) and VFSAD(n)) to this reference, either to their two differential inputs to get the nominal settings or to one of the differential inputs to have easy single-input control. All these control inputs have the same control range. |
Podobny numer części - TDA8785H |
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Podobny opis - TDA8785H |
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