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AD-DPGIOZ 데이터시트(PDF) 44 Page - Analog Devices |
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AD-DPGIOZ 데이터시트(HTML) 44 Page - Analog Devices |
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44 / 61 page ![]() AD9961/AD9963 Data Sheet Rev. A | Page 44 of 60 Single-Ended Buffered Output Using an Op Amp An op amp such as the ADA4899-1 can be used to perform a single-ended current-to-voltage conversion, as shown in Figure 63. The AD9961/AD9963 are configured with a pair of series resistors, RS, off each output. For best distortion performance, RS should be set to 0 Ω. The feedback resistor, RFB, determines the peak-to-peak signal swing by the formula VOUT = RFB × IFS The maximum and minimum voltages out of the amplifier are, respectively, VMAX = VREFIO VMIN = VMAX − IFS × RFB AD9961/AD9963 TXIP TXIN RFB REFIO TXGND CF C +5V –5V RS RS RB VOUT + – ADA4899-1 63 65 64 66 Figure 63. Single-Supply Single-Ended Buffer Interfacing to the ADF4602 The ADF4602 is an RF transceiver suitable for Femtocell and other wireless communications applications. The ADF4602 Tx baseband inputs have a nominal input common-mode voltage requirement of 1.2 V. The AD9963 can be dc coupled to the ADF4602 as shown in Figure 64. When configured for a 2 mA full-scale current, the output swing of the circuit is 1 V ppd centered at 1.2 V. The TXMCL pin is biased at 0.5 V to increase the headroom of the DAC outputs. The TXVDD and CLK33V supplies must be supplied with 3.3 V to support this output compliance range from the DACs. 226Ω 249Ω 0.1uF 249Ω 249Ω 100kΩ 226Ω 249Ω 249Ω 249Ω 100kΩ TXIN TXIP TXCML AUXIO2 TXQN AUXIO3 TXQP TXBBQB TXBBQ TXBBI TXBBIB AD9963 ADF4602 Figure 64. AD9963 to ADF4602 Tx Interface Circuitry The optional 100 kΩ resistors connected between the AUXIO pins and the TXIN (and TXQN) pins allow a dc offset to be provided to null out LO feedthrough at the ADF4602 outputs. |
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