Data Sheet

AD8436

Rev. E | Page 17 of 21

AD8436 EVALUATION BOARD

The AD8436-EVALZ provides a platform to evaluate AD8436

performance. The board is fully assembled, tested, and ready to

use after connecting the power and signal sources. Figure 47

is a photograph of the board and Figure 48 is the schematic.

Signal connections are located on the primary and secondary

sides, with power and ground on the inner layers. Figure 42 to

Figure 46 illustrate the various design details of the board,

including basic layout and copper patterns. These figures are

useful references for application designs.

A Word About Using the AD8436 Evaluation Board

The AD8436-EVALZ offers many options, without sacrificing

simplicity. The board is tested and shipped with a 10 μF averaging

capacitor (CAVG), a 3.3 μF low-pass filter capacitor (CLPF), and a

0.1 μF capacitor to optimize crest factor (CCF) performance. To

evaluate minimum cost applications, remove both capacitors. The

functions of the five switches are listed in Table 6.

Table 6.

Switch

Function

CORE_BUFFER

Selects core or input buffer for the input

signal

INCOUP

Selects ac or dc coupling to the core

SDCOUT

Selects the output buffer or the core

output at the DCOUT BNC

IBUF_VCC

Enables or disables the input buffer

OBUF_VCC

Enables or disables the output buffer

Ample test points provide easy monitoring of inputs and

outputs using standard test equipment. Unity is the input buffer

default gain; for 2× gain, simply install a 0 Ω 0603 resistor (jumper)

at Position R5. For higher IBUF gains, remove the 0 Ω resistor

at Position RFBH (there is an internal 10 kΩ resistor from the

OBUF_OUT to IBUFIN−) and install a smaller value resistor in

Position RFBL. A 100 Ω resistor establishes a gain of 100×.

Single-Supply Operation

Referring to Figure 48, single-supply operation requires the

removal of Resistor R6. If needed, an optional capacitor in the

range 0.1 μF to 4.7 μF may be installed in the R6 position for

ambient noise decoupling (this is rarely required, however).

Connect the negative supply pin (VEE) to ground (GND);

otherwise, the negative supply rails remain open.