AD6644STSLASHPCBZ datasheet(19/25 Pages) AD

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AD6644

Rev. D | Page 18 of 24

EVALUATION BOARD

The schematic of the evaluation board (see Figure 32) repre-

sents a typical implementation of the AD6644. A multilayer

board is recommended to achieve best results. It is highly

recommended that high quality, ceramic chip capacitors be

used to decouple each supply pin to ground directly at the

device. The pinout of the AD6644 facilitates ease of use in

the implementation of high frequency, high resolution design

practices. All of the digital outputs are segregated to two sides

of the chip, with the inputs on the opposite side for isolation

purposes.

Care should be taken when routing the digital output traces. To

prevent coupling through the digital outputs into the analog

portion of the AD6644, minimal capacitive loading should be

placed on these outputs. It is recommended that a fanout of

only one gate should be used for all AD6644 digital outputs.

The layout of the encode circuit is equally critical. Any noise

received on this circuitry results in corruption in the digitization

process and lower overall performance. The encode clock must be

isolated from the digital outputs and the analog inputs.

Table 10. AD6644/PCB Bill of Materials

Qty.

Reference ID1

Description

Manufacturer

Supplier Part No.

PCB

Printed circuit board, AD6644/AD6645 engineering

evaluation board

Moog

6645EE01D REV D

C1, C2, C31, C38

Capacitor, tantalum, SMT BCAPTAJC, 10 μF, 16 V, 10%

Kemet

T491C106K016AS

C3, C7 to C10, C16, C302, C32

Capacitor, ceramic, SMT 0508, 0.1 μF, 16 V, 10%

Presidio Components

0508X7R104K16VP3

C4, C15, C22 to C26, C29, (C33)3,

(C34)3, C39

Capacitor, ceramic, SMT 0805, 0.1 μF, 25 V, 10%

Panasonic

ECJ-2VB1E104K

(C5, C6)3

Capacitor, ceramic, SMT 0805, 0.01 μF, 50 V, 10%

Panasonic

ECJ-2YB1H103K

C11 to C14, C17 to 21, C40

Capacitor, ceramic, SMT 0508, 0.01 μF, 50 V, 0.2%

Presidio Components

0508X7R103M2P3

(C27, 28)

Capacitor, ceramic, SMT 0805, select

CR13

Diode, dual Schottky HSMS2812, SOT-23, 30 V, 20 mA

Panasonic

MA716-(TX)

Install jumper (across OPT_LAT and BUFLAT)

F1 to F5

EMI suppression ferrite chip, SMT 0805

Steward

HZ0805E601R-00

J1-H

Header, 6-pin, pin strip, 5 mm pitch

Wieland

Z5.530.0625.0

Pin strip, 6-pin, 5 mm pitch

Wieland

25.602.2653.0

Header, 40-pin, male, right angle

Samtec

TSW-120-08-T-D-RA

(J3), J4, J5

Connector, gold, male, COAX., SMA, vertical

Johnson Components™

142-0701-201

Inductor, SMT, 1008-ct package, 4.7 nH

Coilcraft®

1008CT-040X-J

(R1)3

Resistor, thick film, SMT 0402, 100 Ω, 1/16 W, 1%

Panasonic

ERJ-2RKF1000V

(R2)

Resistor, thick film, SMT 1206, 60.4 Ω, 1/8 W, 1%

Panasonic

ERJ-8ENF60R4V

(R3 to R5)2, (R8)2, R9, R10

Resistor, thick film, SMT 0805, 500 Ω, 1/10 W, 1%

Panasonic

ERJ-6ENF4990V

R6 and R7

Resistor, thick film, SMT 0805, 25.5 Ω, 1/10 W, 1%

Panasonic

ERJ-6ENF25R5V

(R11)3, (R13)3

Resistor, thick film, SMT 0805, 66.5 Ω, 1/10 W, 1%

Panasonic

ERJ-6ENF66R5V

(R12)3, (R14)3

Resistor, thick film, SMT 0805, 100 Ω, 1/10 W, 1%

Panasonic

ERJ-6ENF1000V

R152

Resistor, thick film, SMT 0402, 178 Ω, 1/16 W, 1%

Panasonic

ERJ-2RKF1780X

R35

Resistor, thick film, SMT 0805, 49.9 Ω, 1/10 W, 1%

Panasonic

ERJ-6ENF49R9V

RN1 to RN4

Resistor array, SMT 0402; 100 Ω; 8 ISO RES.,1/4 W; 5%

Panasonic

EXB2HV101JV

T23, T32

Transformer, ADT4-1WT, CD542, 2 MHz to 775 MHz

Mini-Circuits®

ADT4-1WT

IC, 14-bit, 65 MSPS ADC, LQFP-52

Analog Devices

AD6644

U2, U7

IC, SOIC-20, OCTAL D-type flip-flop

Fairchild

74LCX574

(U3)2

IC, SOIC-8, low distortion differential ADC driver

Analog Devices

AD8138ARM

U4, U6

IC, SOT-23, tiny logic UHS 2-input or gate

Fairchild

NC7SZ32

(U8)3

IC, SOIC-8, differential receiver

Motorola

MC100LVEL16

Clock oscillator, 65 MHz

CTS Reeves

MX045-65

Y1-PS

Pin sockets, closed end

AMP

5-330808-3

STDOFF

Circuit board support

RICHO

CBSB-14-01

1 Reference designators in parentheses are not installed on standard units.

2 AC-coupled AIN is standard: R3, R4, R5, R8, and U3 are not installed. If dc-coupled AIN is required, C30, R15, and T3 are not installed.

3 AC-coupled encode is standard: C5, C6, C33, C34, R1, R11 to R14, and U8 are not installed. If PECL encode is required, CR1 and T2 are not installed.

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