ADL5306

Rev. 0 | Page 14 of 16

EVALUATION BOARD

An evaluation board is available for the ADL5306, the schematic

of which is shown in 29. It can be configured for a wide variety

of experiments. The buffer gain is factory-set to unity, providing

a slope of 200 mV/dec, and the intercept is set to 1 nA. Table 4

describes the various configuration options.

Table 4. Evaluation Board Configuration Options

Component

Function

Default Conditions

P1

Supply Interface. Provides access to supply pins VNEG,

COMM, and VPOS.

P1 = Installed

P2, R8, R9, R10, R18

Monitor Interface. By adding 0 Ω resistors to R8, R9, R10,

and R18, the VREF, VSUM, VOUT, and VLOG pin voltages

can be monitored using a high impedance probe.

P2 = Not Installed

R8 = R9 = R10 = Open (Size 0603)

R18 = Open (Size 0603)

R2, R3, R4, R6, R11, R14, C2, C7, C9, C10

Buffer Amplifier/Output Interface. The logarithmic slope

of the ADL5306 can be altered using the buffer’s gain-

setting resistors, R2 and R3. R4, R6, R11, R14, C2, C7, C9, and

C10 are provided for a variety of filtering applications.

R2 = R6 = 0 Ω (Size 0603)

R3 = R4 = Open (Size 0603)

R11 = R14 = 0 Ω (Size 0603)

C2 = C7 = Open (Size 0603)

C9 = C10 = Open (Size 0603)

VLOG = VOUT = Installed

R1, R19

Intercept Adjustment. The voltage dropped across

resistor R1 determines the intercept reference current,

nominally set to 10

µA using a 200 kΩ 1% resistor.

R1 = 200 kΩ (Size 0603)

R19 = 0 Ω (Size 0603)

R12, R15, C3, C4, C5, C6

Supply Decoupling

C3 = C4 = 0.01

µF (Size 0603)

C5 = C6 = 0.1

µF (Size 0603)

R12 = R15 = 0 Ω (Size 0603)

C11

Filtering VSUM

C11 = 1 nF (Size 0603)

R13, R16, C1, C8

Input Compensation. Provides essential HF compensation

at the input pins, INPT and IREF.

R13 = R16 = 1 kΩ (Size 0603)

C1 = C8 = 1 nF (Size 0603)

IREF, INPT, PD, LK1, R5

Input Interface. The test board is configured to accept a

current through the SMA connector labeled INPT. An SC

style packaged photodiode can be used in place of the

INPT SMA for optical interfacing. By removing R1 and

adding a 0 Ω short for R5, a second current can be applied

to the IREF input (also SMA) for evaluating the ADL5306 in

log-ratio applications.

IREF = INPT = Installed

PD = Not Installed

LK1 = Installed

R5 = Open (Size 0603)

J1

SC Style Photodiode

J1 = Open