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MX7824CQ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MX7824CQ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page fMAX permits a maximum sampling rate of 50kHz per channel when using the MAX158/MX7828 and 100kHz per channel when using the MAX154/MX7824. These rates are well above the Nyquist requirement of 20kHz sampling rate for a 10kHz input bandwidth. Bipolar Input Operation The circuit in Figure 10a can be used for bipolar input operation. The input voltage is scaled by an amplifier so that only positive voltages appear at the ADC’s inputs. An external reference should be used for the MX7824/ MX7828, but is not needed with the MAX154/MAX158. The analog input range is ±4V and the output code is complementary offset binary. The ideal input/output characteristic is shown in Figure 10b. CMOS, High-Speed, 8-Bit ADCs with Multiplexer 10 ______________________________________________________________________________________ 1pF CS 12pF CS 2pF 1pF • • • 15 LSB COMPARATORS TO LS LADDER RON 1pF 1pF • • • 16 MSB COMPARATORS TO MS LADDER RON RMUX RS VIN AIN1 11111111 11111110 10000010 10000001 01111111 01111110 10000000 00000001 00000000 00000010 0V AIN INPUT VOLTAGE (LSBs) FS = 8V 1LSB = FS / 256 11111101 +FS 2 -FS + 1LSB 2 RS VIN AIN1 CS1 2pF CS2 2pF 32pF B MUX 600 Ω RON 350 Ω MAX154 MAX158 AIN1 ONLY CHANNEL 1 SHOWN VREF+ REF OUT VDD VREF- GND 11.5 Ω 3.57k 10.0k 0.01 µF 0.01 µF 0.1 µF 47 µF 16.2k VIN +5V CS RDY INT DB0–DB7 RD Figure 9a. Equivalent Input Circuit Figure 10b. Transfer Function for ±4V Input Operation Figure 9b. RC Network Model Figure 10a. Bipolar ±4V Input Operation |
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Similar Description - MX7824CQ |
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