link to page 16 AD8313Data SheetVNEGC7R40.1 µ F0 Ω R10R12OPEN301 Ω Z1R5R1TP10 Ω 10 Ω Z2VOUTV1 VPOSVOUT 8R6C6PS1C3AD8009C1R7OPENOPEN0.1 µ FAD8313R11680pF0 Ω 0 Ω INHI2 INHIVSET 7C5C2L/R0.1 µ FR8R3680pF53.6 Ω 20k Ω 0 Ω INLO3 INLOCOMM 6EXT VSETR9 0 Ω R2410 Ω VPOS PWDN 5VPS2R210 Ω VPS1C4EXT ENABLE0.1 µ FSW1BA 01085-C-046 Figure 44. Evaluation Board Schematic Table 8. Evaluation Board Configuration Options ComponentFunctionDefault VPS1, VPS2, Supply Pins. VPS1 is the positive supply pin for the AD8313. VPS2 and VNEG are the Not Applicable GND, VNEG positive and negative supply pins for the AD8009. If the AD8009 is being operated from a single supply, VNEG should be connected to GND. VPS1 and VPS2 are independent. GND is shared by both devices. Z1 AD8313 Logarithmic Amplifier. If the AD8313 is used in measurement mode, it is not Installed necessary to power up the AD8009 op amp. The log output can be measured at TP1 or at the SMA connector labeled VSET. Z1 AD8009 Operational Amplifier. Installed SW1 Device Enable. When in Position A, the PWDN pin is connected to ground and the SW1 = A AD8313 is in normal operating mode. In Position B, the PWDN pin is connected to an SMA connector labeled ENBL. A signal can be applied to this connector. R7, R8 Slope Adjust. The slope of the AD8313 can be increased from its nominal value of R7 = 0 Ω (Size 0603) 18 mV/dB to a maximum of 40 mV/dB by removing R11, the 0 Ω resistor, which shorts R8 = installed VSET to VOUT, and installing a 0 Ω resistor at R7. The 20 kΩ potentiometer at R8 can then be used to change the slope. Operating in Controller Mode. To put the AD8313 into controller mode, R7 and R11 should be removed, breaking the link between VOUT and VSET. The VSET pin can then be driven externally via the SMA connector labeled VSET. L/R, C1, C2, R9 Input Interface. The 52.3 Ω resistor in position L/R, along with C1 and C2, create a L/R = 53.6 Ω (Size 0603) wideband 50 Ω input. Alternatively, the 52.3 Ω resistor can be replaced by an inductor C1 = C2 = 680 pF (Size 0603) to form an input matching network. See Input Coupling section for more details. R9 = 0 Ω (Size 0603) Remove the 0 Ω resistor at R9 for differential drive applications. R10, R12 Op Amp Gain Adjust. The AD8009 is initially configured as a buffer; gain = 1. To increase R10 = open (Size 0603) the gain of the op amp, modify the resistor values R10 and R12. R12 = 301 Ω (Size 0603) R5, R6, C6 Op Amp Output Loading/Filtering. A variety of loading and filtering options are R5 = 0 Ω (Size 0603) available for the AD8009. The robust output of the op amp is capable of driving low R6 = open (Size 0603) impedances such as 50 Ω or 75 Ω, configure R5 and R6 accordingly. See the AD8009 C6 = open (Size 0603) data sheet for more details. R1, R2, R3, R4, Supply Decoupling. R1 = R2 = 10 Ω (Size 0603) C3, C4, C5, C7 R3 = R4 = 0 Ω (Size 0603) C3 = C4 = 0.1 µF (Size 0603) C5 = C7 = 0.1 µF (Size 0603) Rev. E | Page 22 of 24 Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Description Typical Performance Characteristics Circuit Description Interfaces Power-Down Interface, PWDN Signal Inputs, INHI, INLO Logarithmic/Error Output, VOUT Setpoint Interface, VSET Applications Information Basic Connections for Log (RSSI) Mode Operating in Controller Mode Input Coupling Narrow-Band LC Matching Example at 100 MHz Adjusting the Log Slope Increasing Output Current Effect of Waveform Type on Intercept Evaluation Board Schematic and Layout General Operation Using the AD8009 Operational Amplifier Varying the Logarithmic Slope Operating in Controller Mode RF Burst Response Outline Dimensions Ordering Guide
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