AD6644AST-40 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
AD6644AST-40 Datasheet PDF : 24 Pages
| |||
AD6644
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
1
PCB
Printed circuit board, AD6644/AD6645 engineering
evaluation board
4
C1, C2, C31, C38
Capacitor, tantalum, SMT BCAPTAJC, 10 μF, 16 V, 10%
8
C3, C7 to C10, C16, C302, C32
Capacitor, ceramic, SMT 0508, 0.1 μF, 16 V, 10%
9
C4, C15, C22 to C26, C29, (C33)3,
(C34)3, C39
Capacitor, ceramic, SMT 0805, 0.1 μF, 25 V, 10%
0
(C5, C6)3
Capacitor, ceramic, SMT 0805, 0.01 μF, 50 V, 10%
10 C11 to C14, C17 to 21, C40
Capacitor, ceramic, SMT 0508, 0.01 μF, 50 V, 0.2%
0
(C27, 28)
Capacitor, ceramic, SMT 0805, select
1
CR13
Diode, dual Schottky HSMS2812, SOT-23, 30 V, 20 mA
1
E1
Install jumper (across OPT_LAT and BUFLAT)
5
F1 to F5
EMI suppression ferrite chip, SMT 0805
1
J1-H
Header, 6-pin, pin strip, 5 mm pitch
1
J1
Pin strip, 6-pin, 5 mm pitch
1
J2
Header, 40-pin, male, right angle
2
(J3), J4, J5
Connector, gold, male, COAX., SMA, vertical
1
L1
Inductor, SMT, 1008-ct package, 4.7 nH
0
(R1)3
Resistor, thick film, SMT 0402, 100 Ω, 1/16 W, 1%
0
(R2)
Resistor, thick film, SMT 1206, 60.4 Ω, 1/8 W, 1%
2
(R3 to R5)2, (R8)2, R9, R10
Resistor, thick film, SMT 0805, 500 Ω, 1/10 W, 1%
2
R6 and R7
Resistor, thick film, SMT 0805, 25.5 Ω, 1/10 W, 1%
0
(R11)3, (R13)3
Resistor, thick film, SMT 0805, 66.5 Ω, 1/10 W, 1%
0
(R12)3, (R14)3
Resistor, thick film, SMT 0805, 100 Ω, 1/10 W, 1%
1
R152
Resistor, thick film, SMT 0402, 178 Ω, 1/16 W, 1%
1
R35
Resistor, thick film, SMT 0805, 49.9 Ω, 1/10 W, 1%
4
RN1 to RN4
Resistor array, SMT 0402; 100 Ω; 8 ISO RES.,1/4 W; 5%
2
T23, T32
Transformer, ADT4-1WT, CD542, 2 MHz to 775 MHz
1
U1
IC, 14-bit, 65 MSPS ADC, LQFP-52
2
U2, U7
IC, SOIC-20, OCTAL D-type flip-flop
0
(U3)2
IC, SOIC-8, low distortion differential ADC driver
2
U4, U6
IC, SOT-23, tiny logic UHS 2-input or gate
0
(U8)3
IC, SOIC-8, differential receiver
1
Y1
Clock oscillator, 65 MHz
4
Y1-PS
Pin sockets, closed end
4
STDOFF
Circuit board support
Manufacturer
Moog
Kemet
Presidio Components
Panasonic
Panasonic
Presidio Components
Supplier Part No.
6645EE01D REV D
T491C106K016AS
0508X7R104K16VP3
ECJ-2VB1E104K
ECJ-2YB1H103K
0508X7R103M2P3
Panasonic
MA716-(TX)
Steward
Wieland
Wieland
Samtec
Johnson Components™
Coilcraft®
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Mini-Circuits®
Analog Devices
Fairchild
Analog Devices
Fairchild
Motorola
CTS Reeves
AMP
RICHO
HZ0805E601R-00
Z5.530.0625.0
25.602.2653.0
TSW-120-08-T-D-RA
142-0701-201
1008CT-040X-J
ERJ-2RKF1000V
ERJ-8ENF60R4V
ERJ-6ENF4990V
ERJ-6ENF25R5V
ERJ-6ENF66R5V
ERJ-6ENF1000V
ERJ-2RKF1780X
ERJ-6ENF49R9V
EXB2HV101JV
ADT4-1WT
AD6644
74LCX574
AD8138ARM
NC7SZ32
MC100LVEL16
MX045-65
5-330808-3
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.
Rev. D | Page 18 of 24
Share Link: 