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MX7534BQ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MX7534BQ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page Microprocessor-Compatible, 14-Bit DACs 10 ______________________________________________________________________________________ Compensation A compensation capacitor, C1, may be needed when the DAC is used with a high-speed output amplifier. The capacitor cancels the pole formed by the DAC’s output capacitance and internal feedback resistance. Its value depends on the type of op amp used, but typi- cal values range from 10pF to 33pF. Too small a value causes output ringing, while excess capacitance over- damps the output. Minimize C1’s size and improve out- put settling performance by keeping the PC board trace as short as possible and stray capacitance at IOUT as small as possible. Bypassing Place a 1µF bypass capacitor, in parallel with a 0.01µF ceramic capacitor, as close to the DAC’s VDD and GND pins as possible. Use a 1µF tantalum bypass capacitor to optimize high-frequency noise rejection. Place a 4.7µF decoupling capacitor at VSS to minimize the DAC output leakage current. The MX7534/MX7535 have high-impedance digital inputs. To minimize noise pickup, connect them to either VDD or GND terminals when not in use. Connect active inputs to VDD or GND through high-value resis- tors (1M Ω) to prevent static charge accumulation if these pins are left floating, as might be the case when a circuit card is left unconnected. Op-Amp Selection Input offset voltage (VOS), input bias current (IB), and offset voltage drift (TC VOS) are three key parameters in determining the choice of a suitable amplifier. To main- tain specified accuracy with VREF of 10V, VOS should be less than 30µV and IB should be less than 2nA. Open-loop gain should be greater than 340,000. Maxim’s MAX400 has low VOS (10µV max), low IB (2nA), and low TC VOS (0.3µV/°C max). This op amp can be used without requiring any adjustments. For OP AMP INPUT OFFSET VOLTAGE (VOS) INPUT BIAS CURRENT (IB) OFFSET VOLTAGE DRIFT (TC VOS) SETTLING TO 0.003% FS MAX400 10µV 2nA 0.3µV/°C 50µs Maxim OP07 25µV 2nA 0.6µV/°C 50µs AD554L* 500µV 25pA 5µV/°C 5µs HA2620* 4mV 35nA 20µV/°C 0.8µs Table 5. Amplifier Performance Comparisons * AD544L is an Analog Devices part; HA2620 is a Harris Semiconductor part. R4 33 Ω R3 100 Ω INPUT DATA SIGNAL GROUND A1 A2 7–14 620 5 4 3 2 19 1 C1 33pF VDD VDD RL VSS MX7534 REF RFB IOUT AGNDS AGNDF DGND D7–D0 + + VIN NOTE: CONTROL INPUTS OMITTED FOR CLARITY. VO Figure 6a. Unipolar Binary Operation with Forced Ground R2 10 Ω R1 20 Ω INPUT DATA SIGNAL GROUND ANALOG GROUND A1 A2 8–21 7 27 6 5 4 3 26 21 C1 33pF VDD VDD RL VSS MX7535 REFF REFS RFB IOUT AGNDS AGNDF DGND D13–D0 + + VOLTAGE REFERENCE NOTE: CONTROL INPUTS OMITTED FOR CLARITY. VO Figure 6b. Unipolar Binary Operation with Forced Ground for Remote Load |
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