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AD7920AKS-REEL7 Datasheet(PDF) 10 Page - Analog Devices |
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AD7920AKS-REEL7 Datasheet(HTML) 10 Page - Analog Devices |
10 / 20 page REV. B –10– AD7910/AD7920 CIRCUIT INFORMATION The AD7910/AD7920 are fast, micropower, 10-bit/12-bit, single-supply A/D converters, respectively. The parts can be operated from a 2.35 V to 5.25 V supply. When operated from either a 5 V supply or a 3 V supply, the AD7910/AD7920 are capable of throughput rates of 250 kSPS when provided with a 5 MHz clock. The AD7910/AD7920 provide the user with an on-chip track- and-hold, A/D converter, and a serial interface housed in a tiny 6-lead SC70 package or 8-lead MSOP package, which offers the user considerable space saving advantages over alternative solu- tions. The serial clock input accesses data from the part but also provides the clock source for the successive-approximation A/D converter. The analog input range is 0 V to VDD. An external reference is not required for the ADC and there is no reference on-chip. The reference for the AD7910/AD7920 is derived from the power supply and thus gives the widest dynamic input range. The AD7910/AD7920 also feature a power-down option to allow power saving between conversions. The power-down feature is implemented across the standard serial interface, as described in the Modes of Operation section. CONVERTER OPERATION The AD7910/AD7920 is a successive-approximation analog- to-digital converter based around a charge redistribution DAC. Figures 4 and 5 show simplified schematics of the ADC. Figure 4 shows the ADC during its acquisition phase. When SW2 is closed and SW1 is in position A, the comparator is held in a balanced condition, and the sampling capacitor acquires the signal on VIN. CHARGE REDISTRIBUTION DAC CONTROL LOGIC COMPARATOR SW2 SAMPLING CAPACITOR ACQUISITION PHASE SW1 A B AGND VDD/2 VIN Figure 4. ADC Acquisition Phase CODE 1.0 0.4 –0.2 0 1024 512 0.8 0.6 0.2 0 –0.4 –0.6 –0.8 –1.0 1536 2048 2560 3072 3584 4096 VDD = 2.35V TEMP = 25 C fSAMPLE = 250kSPS TPC 5. AD7920 DNL Performance INPUT FREQUENCY (kHz) –30 –60 10 1000 100 –10 –20 –40 –50 –70 –80 –90 VDD = 3.6V RIN = 10k RIN = 1k RIN = 130 RIN = 13 RIN = 0 TPC 6. THD vs. Analog Input Frequency for Various Source Impedances INPUT FREQUENCY (kHz) –75 –90 10 1000 100 –65 –70 –80 –85 VDD = 5.25V VDD = 2.35V VDD = 2.7V VDD = 4.75V VDD = 3.6V TPC 7. THD vs. Analog Input Frequency for Various Supply Voltages |
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