ADRF6806ACPZ-R7 datasheet(28/36 Pages) AD

28 / 36 page

ADRF6806

Data Sheet

Rev. B | Page 28 of 36

Table 7. Evaluation Board Configuration Options

Component

Function

Default Condition

VCC, VCC2, VCC_LDO, VCC_LO,

VCC_LO1, VCC_RF, VCC_BB1, 3P3V1,

3P3V2, 3P3V_FORCE, 2P5V, CLK,

DATA, LE, CP, DIG_GND, GND, GND1,

GND2

Power supply, ground and other test points.

Connect a 5 V supply to VCC. Connect a 3.3 V

supply to 3P3V_FORCE.

VCC, VCC2, VCC_LO, VCC_RF, VCC_BB1,

VCC_LO1, VCO_LDO, 3P3V1, 3P3V2, 2P5V =

Components Corporation TP-104-01-02,

CP, LE, CLK, DATA, 3P3V_FORCE =

Components Corporation TP-104-01-06,

GND, GND1, GND2, DIG_GND =

Components Corporation TP-104-01-00

R1, R6, R7, R8, R13, R14, R15, R17,

R18, R24, R25, R27, R28, R29, R31,

R32, R34, R36, R49

Power supply decoupling. Shorts or power supply

decoupling resistors.

R1, R6, R7, R8 = 0 Ω (0402),

R13, R14, R15, R17 = 0 Ω (0402),

R18, R24, R25, R27 = 0 Ω (0402),

R28, R29, R31, R32 = 0 Ω (0402),

R34, R36 = 0 Ω (0402),

R49 = open (0402)

C1, C2, C3, C4, C7, C8, C9, C10, C11,

C12, C16, C17, C18, C19, C20, C21,

C22, C23, C24, C25, C26, C27, C28,

C35, C36, C37, C40

The capacitors provide the required decoupling of

the supply-related pins.

C1, C8, C10, C12 = 100 pF (0402),

C16, C18, C21, C22 = 100 pF (0402),

C24, C26 = 100 pF (0402),

C2, C7, C9, C11 = 0.1 μF (0402),

C17, C19, C20, C23 = 0.1 μF (0402),

C25, C40 = 0.1 μF (0402),

C3, C4, C27, C35 = 10 μF (0603),

C36, C37 = 10 μF (0603),

C28 = 10 μF (3216)

T1, C5, C6

External LO path. The T1 transformer provides

single-ended-to-differential conversion. C5 and C6

provide the necessary ac coupling.

C5, C6 = 1 nF (0603),

T1 = TC1-1-13+ Mini-Circuits

R16, R26, R58, C31

REFIN input path. R26 provides a broadband 50 Ω

termination followed by C31, which provides the

ac coupling into REFIN. R16 provides an external

connectivity to the MUXOUT feature described in

the P1-6 line of a 9-pin D-sub connector for dc

measurements.

R26 = 49.9 Ω (0402),

R16 = 0 Ω (0402),

R58 = open (0402),

C31 = 1 nF (0603)

R2, R9, R10, R11, R12, R37, R38, R59,

C14, C15, C13

Loop filter component options. A variety of loop

filter topologies is supported using component

placements C13, C14, C15, R9, and R10. R38 and

R59 provide connectivity options to numerous test

points for engineering evaluation purposes. R2

provides resistor programmability of the charge

pump current (see Register 4 description). R37

connects the charge pump output to the loop filter.

R12 references the loop filter to the VCO_LDO.

R12, R37, R38 = 0 Ω (0402),

R59 = open (0402),

R9 = 5.6 kΩ (0402),

R10 = 1.6 kΩ (0402),

R2, R11 = open (0402),

C13 = 62pF (0402),

C14 = 300pF (0402),

C15 = 6.2nF (1206)

R3, R4, R5, R21, R22, R23, R39, R40,

R41, R42, R43, R44, R45, R46, R47,

R48, C29, C30, T2, T3, P2, P3

IF I/Q output paths. The T2 and T3 baluns provide a

9:1 impedance transformation; therefore, with a 50 Ω

load on the single-ended IOUT/QOUT side, the center

tap side of the balun presents a differential 450 Ω

to the ADRF6806. The center taps of the baluns are

ac grounded through C29 and C30. The baluns create

a differential-to-single-ended conversion for ease

of testing and use, but an option to have straight

differential outputs is achieved via populating R3,

R39, R23, and R42 with 0 Ω resistors and removing

R4, R5, R21, and R22. P2 and P3 are differential

measurement test points (not to be used as jumpers).

R4, R5, R21, R22, = 0 Ω (0402),

R40, R43, R45, R46 = 0 Ω (0402),

R47, R48 = 0 Ω (0402),

R3, R23, R39, R41, R42, R44 = open (0402),

C29, C30, = 0.1 μF (0402),

T2, T3 = TCM9-1+ Mini-Circuits,

P2, P3 = Samtec SSW-102-01-G-S

C38, C39, T4

RF input interface. T4 provides the single-ended-

to-differential conversion required to drive RFIP and

RFIN. T4 provides a 2:1 impedance transformation.

A single-ended 50 Ω load on the RFIN SMA

connector transforms to a differential 100 Ω

presented across the RFIP (Pin 25) and RFIN (Pin 26)

pins. C38 and C39 are ac coupling capacitors.

C38, C39 = 1000 pF (0402),

T4 = ADTL2-18+ Mini-Circuits

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