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AD8326ARP-REEL Datasheet(PDF) 11 Page - Analog Devices |
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AD8326ARP-REEL Datasheet(HTML) 11 Page - Analog Devices |
11 / 24 page REV. 0 AD8326 –11– Input Bias, Impedance, and Termination The VIN+ and VIN– inputs have a dc bias level of approxi- mately 1.47 V below VCC/2, therefore the input signal should be ac-coupled using 0.1 µF capacitors as seen in the typical application circuit (see Figure 5). The differential input impedance of the AD8326 is approxi- mately 1600 Ω, while the single-ended input is 800 Ω. Single-Ended Inverting Input When operating the AD8326 in a single-ended input mode VIN+ and VIN– should be terminated as illustrated in Figure 6. On the AD8326 evaluation boards, this termination method requires the removal of R12, R13, R14, R16, R17, and R18. Install a 0 Ω jumper at R15, an 82.5 Ω resistor at R10 for a 75 Ω system, and a 39.2 Ω resistor at R11 to balance the inputs of the AD8326 evaluation board (Figure 11). Other input impedance configura- tions may be calculated using the equations in Figure 6. AD8326 R10 R11 + – ZIN = R10||800 R11 = ZIN||R10 VIN– Figure 6. Single-Ended Input Impedance The inverting and noninverting inputs of the AD8326 must be balanced for all input configurations. Differential Input from Single-Ended Source The default configuration of the evaluation board implements a differential signal drive from a single-ended signal source. A Toko 1:1 transformer is included on the board for this purpose (T3). Enabling the evaluation board for single to differential input conversion requires R15–R17 to be removed, and 0 Ω jumpers must be installed on the placeholders for R13, R14, and R18. For a 75 Ω input impedance, R12 should be 78.7 Ω. Refer to Figure 11 for evaluation board schematic. In this configuration, the input signal must be applied to VIN–. Other input imped- ances may be calculated using the equation in Figure 7. VIN– AD8326 DESIRED IMPEDANCE = R12||1600 R12 Figure 7. Differential Signal from Single-Ended Source Differential Signal Source The AD8326 evaluation board is also capable of accepting a differential input signal. This requires the installation of a 165 Ω resistor in R12, the removal of R13–R14, R17–R18, and the installation of 0 Ω jumpers for R15–R16. This configuration results in a differential input impedance of 150 Ω. Other differ- ential input impedance configurations may be calculated with the equation in Figure 8. VIN+ AD8326 VIN– R12 DESIRED IMPEDANCE = R12||1600 Figure 8. Differential Input DATEN SDATA CLK GND1 VCC TXEN SLEEP GND VCC VCC VEE GND VEE VOUT– GND VCC VIN– VIN+ VEE VCC VEE BYP VCC VCC VEE GND VEE VOUT+ AD8326 VEE TXEN DATEN SDATA CLK 10 F 0.1 F 0.1 F 0.1 F TOKO 617DB-A0070 TO DIPLEXER ZIN = 75 0.1 F 0.1 F 0.1 F 0.1 F 0.1 F 165 VIN– VIN+ ZIN = 150 10 F VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SLEEP 0.1 F 0.1 F 0.1 F 0.1 F 0.1 F 0.1 F 0.1 F 0.1 F Figure 5. Typical Applications Circuit |
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