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AD8327-EVAL Datasheet(PDF) 9 Page - Analog Devices |
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AD8327-EVAL Datasheet(HTML) 9 Page - Analog Devices |
9 / 20 page REV. 0 AD8327 –9– Single-Ended Inverting Input When operating the AD8327 in a single-ended input mode VIN+ and VIN– should be terminated as illustrated in Figure 5. On the AD8327 evaluation boards, this termination method requires the removal of R13–R16 and R20, as well as the addition of a 0 Ω jumper at R17. Table II shows the correct values for R11 and R12 for some common input configurations. Other input imped- ance configurations may be accommodated using the equations in Figure 5. The inverting and noninverting inputs of the AD8327 must be balanced for all input configurations + – R11 R12 ZIN 800 800 – ZIN R12 = AD8327 ZIN ZIN R12 R12 + ZIN R11 = Figure 5. Single-Ended Inverting Input 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 R11–R12 and R16–R17 to be removed, and 0 Ω jumpers must be installed on the placeholders for R14, R15, and R20. Table II provides typical R13 values for common input configurations. Other input impedances may be calculated using the equation in Figure 6. Refer to Figure 10 for evaluation board schematic. To utilize the transformer for converting a single- ended source into a differential signal, the input signal must be applied to VIN+. VIN+ R13 AD8327 R13 = ZIN 1600 1600 – ZIN ZIN Figure 6. Single to Differential Input Differential Signal Source The AD8327 evaluation board is also capable of accepting a differential input signal. Remove R11–R12, R14–R15, and R20, and place 0 Ω jumpers for R16–R17. See Table II for common values of R13, or calculate other input configurations using the equation in Figure 7. VIN+ AD8327 VIN– R13 ZIN R13 = ZIN 1600 1600 – ZIN Figure 7. Differential Input Output Bias, Impedance, and Termination The output of the AD8327 has a dc bias level of approximately VCC/2; therefore, it should be ac-coupled before being applied to the load. The output impedance of the AD8327 is internally maintained at 75 Ω, regardless of whether the amplifier is in transmit enable or transmit disable mode. This eliminates the need for external back termination resistors. If the output signal is being evaluated using standard 50 Ω test equipment, a mini- mum loss 75 Ω to 50 Ω pad must be used to provide the test circuit with the proper impedance match. SDATA CLK GND VCC TXEN VCC CXR GND GND VOUT SLEEP VIN– VIN+ BYP VCC GND GND VCC VCC ENB AD8327 10 F TO DIPLEXER ZIN = 75 TXEN SDATA CLK SLEEP ENB 0.1 F 0.1 F 0.1 F 165 VIN– VIN+ ZIN = 150 VCC 0.1 F 100pF 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 0.1 F 0.1 F 0.1 F 0.1 F 0.1 F Figure 4. Typical Application Circuit |
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