ADRF6807ACPZ-R7 datasheet(29/36 Pages) AD

29 / 36 page

Data Sheet

ADRF6807

Rev. B | Page 29 of 36

Component

Function

Default Condition

R50, R51, R52, C32, C33, C34

Serial port interface. Optional RC filters can be

installed on the CLK, DATA, and LE lines to filter the

PC signals through R50 to R52 and C32 to C34. CLK,

DATA, and LE signals can be observed via test points

for debug purposes.

R50, R51, R52 = open (0402),

C32, C33, C34 = open (0402)

R33, R55, R56, S1

LO select interface. The LOSEL pin, in combination

with the LDRV and LXL bits in Register 5, controls

whether the LOP and LON pins operate as inputs or

outputs. A detailed description of how the LOSEL pin,

LDRV bit, and the LXL bit work together to control

the LOP and LON pins is found in Table 4 under the

LOSEL pin description. Using the S1 switch, the

user can pull LOSEL to a logic high (VCC/2) or a logic

low (ground). Resistors R55 and R56 form a resistor

divider to provide a logic high of VCC/2. LO select

can also be controlled through Pin 9 of J1. The 0 Ω

jumper, R33, must be installed to control LOSEL via J1.

R33 = 0 Ω (0402),

R55, R56 = 10 kΩ (0402),

S1 = Samtec TSW-103-08-G-S

J1, P1, R62, R63

Engineering test points and external control. J1 is a

10-pin connector connected to various important

points on the evaluation board that the user can

measure or force voltages upon. R62 and R63 form

a voltage divider to force a voltage of 1.65 V on

VOCM. Note that Jumper P5 must be connected to

drive VOCM with the resistor divider.

R62 = R63 = 4.99 kΩ (0402),

P1 = Samtec SSW-102-01-G-S,

J1 = Molex Connector Corp. 10-89-7102

U2, U3, U4, P5

Cypress microcontroller, EEPROM and LDO.

U2 = Microchip MICRO24LC64

U3 = Analog Devices ADP3334ACPZ

U4 = Cypress Semiconductor

CY7C68013A-56LTXC

P5 = Mini USB connector

C41, C42, C43, C44, C46, C53, C55

3.3 V supply decoupling. Several capacitors are

used for decoupling on the 3.3 V supply.

C41, C42, C43, C44, C46, C53, C55 = 0.1 μF

(0402)

C48, C49, C45, C56, C57, C58, R19,

R60, R61, R62, R64, CR2

Cypress and EEPROM components.

C48, C56 = 10 pF (0402)

C45, C49, C57, C58 = 0.1 μF (0402)

R19, R60, R61 = 2 kΩ (0402)

R62, R64 = 100 kΩ (0402)

CR2 = ROHM SML-21OMTT86

C47, C50, C52, R65, R69, R70, CR1

LDO components.

C47, C52 = 1 μF (0402)

C50 = 1000 pF (0402)

R65 = 2 kΩ (0402)

R69 = 78.7 kΩ (0402)

R70 = 140 kΩ (0402)

CR1 = ROHM SML-21OMTT86

Y1, C51, C54

Crystal oscillator and components. 24 MHz crystal

oscillator.

Y1 = NDK NX3225SA-24 MHz

C51, C54 = 22 pF (0402)

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