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AD9122 Arkusz danych(PDF) 2 Page - Analog Devices |
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AD9122 Arkusz danych(HTML) 2 Page - Analog Devices |
2 / 9 page CN-0205 Circuit Note Rev. 0 | Page 2 of 9 TOP VIEW AD9122 DAC ADL5375 MODULATOR BOTTOM VIEW FILTER Figure 2. AD9122-M5375-EBZ Evaluation Board for Circuit Implementation The DAC’s full-scale output current (IFS) is programmable from 10 mA to 30 mA. The nominal and default value is 20 mA. In this configuration, the DAC outputs swing from 0 mA to 20 mA across each of the four ground-referenced 50 Ω resistors (RB = RBIP = RBIN = RBQP = RBQN). This establishes the 500 mV dc bias level and a full-scale voltage swing of 2 V p-p differential on each output pair (with no load). This 2 V p-p voltage swing can be adjusted by the RL (RL = RSLI = RSLQ) shunt resistors without affecting the 500 mV bias level. The resulting differential peak-to-peak swing at the I/Q modulator input is given by the equation [ ] [ ] L B L B FS SIGNAL R R R R I V + × × × × = 2 2 Note that the relatively high differential input impedance of the ADL5375 (typically >60 kΩ) can be ignored when calculating this signal level. Figure 3 shows the relationship between the peak-to-peak voltage swing and RL when 50 Ω bias-setting resistors are used. The ADL5375-05 and AD9122 are well matched in terms of dynamic range and gain. As a result, there is no need for any active gain between the devices. The I/Q modulator drive level can be fine tuned as needed by adjusting the value of RL as described above. For most applications, a value of 100 Ω for RL is recommended. This results in a full-scale signal level of 1 V p-p (DAC output at 0 dBFS). |
Podobny numer części - AD9122 |
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Podobny opis - AD9122 |
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