ADRF6516ACPZ-R7 datasheet(28/29 Pages) AD

28 / 29 page

ADRF6516

Data Sheet

Rev. C | Page 28 of 29

Components

Function

Default Conditions

Enable interface. The ADRF6516 is powered up by applying a logic

high voltage to the ENBL pin (Jumper P2 is connected to VPS).

P2 = installed for enable

P1, C28, C29, R1, R29, R30, R33,

R34

Serial control interface. The digital interface sets the corner

frequency, the preamplifier gain, the postamplifier gain, and the VGA

maximum gain of the device using the serial interface via the LE, CLK,

DATA, and SDO pins. RC filter networks are provided on the CLK and

LE lines to filter the PC signals. CLK, DATA, and LE signals can be

observed via SMB connectors for debug purposes.

P1 = installed

R1 = 10 kΩ (Size 0402)

C28, C29 = 330 pF (Size 0402)

R29, R30 = 100 Ω (Size 0402)

R33, R34 = 0 Ω (Size 0402)

P4, C13, C14, R3

DC offset compensation loop. The dc offset compensation loop is

enabled (low) with Jumper P4. When enabled, the C13 and C14

capacitors are connected to circuit common. The high-pass corner

frequency is expressed as follows:

fHP

(Hz) = 6.7 × (Post Filter Linear Gain/COFS (µF))

P4 = installed

C13, C14 = 1000 pF (Size 0402)

R3 = 10 kΩ (Size 0402)

C27

Input common-mode setpoint. The input common-mode voltage

can be set externally when applied to the VICM pin. If the VICM pin is

left open, the input common-mode voltage defaults to VPS/2.

C27 = 0.1 µF (Size 0402)

C18, R6

Output common-mode setpoint. The output common-mode voltage

can be set externally when applied to the VOCM pin. If the VOCM pin

is left open, the output common-mode voltage defaults to VPS/2.

C18 = 0.1 µF (Size 0402)

R6 = 0 Ω (Size 0402)

C17, R5

Analog gain control. The range of the GAIN pin is from 0 V to 1 V,

creating a gain scaling of 15 mV/dB.

C17 = 0.1 µF (Size 0402)

R5 = 0 Ω (Size 0402)

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

C35, C36, C40, C41, C42, C44,

C46

3.3 V supply decoupling. Several capacitors are used for decoupling

on the 3.3 V supply.

C35, C36, C40, C41, C42, C44, C46

= 0.1 µF (0402)

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

R59, R60, R61, R62, R64, CR2

Cypress and EEPROM components.

C57, C48 = 10 pF (0402)

C56, C58, C45, C49 = 0.1 µF

(0402)

R59, 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-24MHz

C51, C54 = 22 pF (0402)

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