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AD9713B Datasheet(PDF) 6 Page - Analog Devices |
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AD9713B Datasheet(HTML) 6 Page - Analog Devices |
6 / 12 page AD9712B/AD9713B REV. B –6– The REFERENCE IN pin can also be driven directly for wider bandwidth multiplying operation. The analog signal for this mode of operation must have a signal swing in the range of –3.75 V to –4.25 V. This can be implemented by capacitively coupling into REFERENCE IN a signal with a dc bias of –3.75 V to –4.25 V, as shown in Figure 3; or by driving REFERENCE IN with a low impedance op amp whose signal swing is limited to the stated range. Outputs As indicated earlier, D1–D4 (four MSBs) are decoded and drive 15 discrete current sinks. D5 and D6 are binarily weighted; and D7–D12 are applied to the R-2R network. This segmented archi- tecture reduces frequency domain errors due to glitch impulse. REFERENCE IN AD9712B AD9713B –VS – ~ –4V –VS 17 Figure 3. Wideband Multiplying Circuit The Switch Network provides complementary current outputs IOUT and IOUT. These current outputs are based on statistical current source matching which provides 12-bit linearity without trim. Current is steered to either IOUT or IOUT in proportion to the digital input code. The sum of the two currents is always equal to the full-scale output current minus one LSB. The current output can be converted to a voltage by resistive loading as shown in Figure 4. Both IOUT and IOUT should be loaded equally for best overall performance. The voltage which is developed is the product of the output current and the value of the load resistor. Full-scale output current is determined by CONTROL AMP IN and RSET according to the equation: IOUT (FS) = (CONTROL AMP IN/RSET) × 128 The internal reference is nominally –1.18 V with a tolerance of ±3.5% and typical drift over temperature of 50 ppm/°C. If greater accuracy or better temperature stability is required, an external reference can be utilized. The AD589 reference shown in Figure 1 features ±10 ppm/°C drift over temperatures from 0 °C to +70°C. CONTROL AMP IN AD9712B AD9713B AD589 + – R1 ~ –11k –VS 19 Figure 1. Use of AD589 as External Reference Two modes of multiplying operation are possible with the AD9712B/AD9713B. Signals with small signal bandwidths up to 300 kHz and input swings of 100 mV, or dc signals from –0.6 V to –1.2 V can be applied to the CONTROL AMP input as shown in Figure 2. Because the control amplifier is internally compensated, the 0.1 µF capacitor at Pin 17 can be reduced to 0.01 µF to maximize the multiplying bandwidth. However, it should be noted that settling time for changes to the digital in- puts will be degraded. CONTROL AMP IN AD9712B AD9713B 19 24 17 18 18 REFERENCE IN CONTROL AMP OUT RSET RSET R T –0.6V TO –1.2V 300 kHz MAX Figure 2. Low Frequency Multiplying Circuit |
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