ADRF6806ACPZ-R7 datasheet(29/36 Pages) AD

29 / 36 page

Data Sheet

ADRF6806

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 Technology Inc. MICRO24LC64,

U3 = Analog Devices, Inc., 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 the 3.3 V supply.

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

(0402)

C45, C47, C48, C49, C50, C52, C56,

C57, C58, R19, R60, R61, R62, R64,

R65, R69, R70, CR1, CR2

USB microcontroller section components

C47, C52 = 1 μF (0402),

C48, C56 = 10 pF (0402),

C45, C49, C57, C58 = 0.1 μF (0402),

C50 = 1000 pF (0402),

R19, R60, R61 = 2 kΩ (0402),

R62, R64 = 100 kΩ (0402),

R65 = 2 kΩ (0402),

R69 = 78.7 kΩ (0402),

R70 = 140 kΩ (0402),

CR1 = ROHM Semiconductor SML-21OMTT86,

CR2 = ROHM Semiconductor SML-21OMTT86

Y1, C51, C54

Crystal oscillator (24 MHz) and components.

Y1 = NDK NX3225SA-24MHz,

C51, C54 = 22 pF (0402)

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