ADRF6702ACPZ-R7 datasheet(32/36 Pages) AD

32 / 36 page

ADRF6702

Data Sheet

Rev. B | Page 32 of 36

Table 11. Evaluation Board Configuration Options

Component

Description

Default Condition/Option

Settings

S1, R39, R40

LO select. Switch and resistors to ground LOSEL pin. The LOSEL

pin setting in combination with internal register settings,

determines whether the LOP/LON pins function as inputs or

outputs. With the LOSEL pin grounded, register settings can

set the LOP/LON pins to be inputs or outputs.

EXT LO, T3

LO input/output. An external 1× LO or 2× LO can be applied to

this single-ended input connector. Alternatively, the internal

1× or 2× LO can be brought out on this pin. The differential LO

signal on LOP and LON is converted to a single-ended signal

using a broadband 1:1 balun (Macom MABA-007159, 4.5 MHz

to 3000 MHz frequency range). The balun footprint on the

evaluation board is also designed to accommodate Johanson

baluns: 3600BL14M050 (1:1, 3.3 GHz to 3.9 GHz) and

3700BL15B050E (1:1, 3.4 GHz to 4 GHz).

T3 = Macom MABA-007159

EXT LO SMA connector = installed

REFIN SMA Connector, R73

Reference input. The input reference frequency for the PLL is

applied to this connector. Input resistance is set by R73 (49.9 Ω).

FREFIN = 153.6 MHz

R73 = 49.9 Ω

REFOUT SMA Connector, R16

Multiplexer output. The REFOUT connector connects directly

to the device’s MUXOUT pin. The on-board multiplexer can

be programmed to bring out the following signals:

REFIN, 2× REFIN, REFIN/2, REFIN/4,

Temperature sensor output voltage (VPTAT),

Lock detect indicator.

REFOUT SMA connector = open

R16 = open

CP Test Point, R38

Charge pump test point. The unfiltered charge pump signal

can be probed at this test point. Note that this pin should not

be probed during critical measurements such as phase noise.

CP = open

R38 = open

C13, C14, C15, C40R9, R10, R37, R65

Loop filter. Loop filter components.

See Table 8

R11, R12, R62, R63, VTUNE SMA

Connector

Internal vs. external VCO. When the internal VCO is enabled,

the loop filter components connect directly to the VTUNE pin

(Pin 39) by installing a 0 Ω resistor in R62. In addition, the loop

filter components should be returned to Pin 40 (DECL3) by

installing a 0 Ω resistor in R12.

To use an external VCO, R62 should be left open. A 0 Ω resistor

should be installed in R63, and the voltage input of the VCO

should be connected to the VTUNE SMA connector. The output

of the VCO is brought back into the PLL via the LO IN/OUT SMA

connector. In addition, the loop filter components should be

returned to ground by installing a 0 Ω resistor in R11.

Loop filter return.

R12 = 0 Ω (0402)

R11 = open (0402)

R62 = 0 Ω (0402)

R63 = open (0402)

VTUNE = open

RSET. This pin is unused and should be left open.

R2 = open (0402)

R23, R3

Baseband input termination. Termination resistors for the

baseband filter of the DAC can be placed on R23 and R3. In

addition to terminating the baseband filters, these resistors

also scale down the baseband voltage from the DAC without

changing the bias level. These resistors are generally set in the

100 Ω to 300 Ω range.

R3 = R23 = open (0402)

P3 4-Pin Header, R15, R17, R18

USB circuitry bypass. The USB circuitry can be bypassed,

allowing for the serial port of the ADRF6702 to be driven

directly. P3 (Samtec TSW-104-08-G-S) must be installed, and

0 Ω resistors (R15, R17 and R18) must be removed.

P3 = open

R15, R17, R18 = 0 Ω (0402)

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