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
Manufacturer
Supplier Part No.
1
PCB
Printed circuit board, AD6644/AD664ꢀ engineering
evaluation board
Moog
664ꢀEE01D REV D
4
8
9
C1, C2, C31, C38
Capacitor, tantalum, SMT BCAPTAJC, 10 μF, 16 V, 10%
Capacitor, ceramic, SMT 0ꢀ08, 0.1 μF, 16 V, 10%
Capacitor, ceramic, SMT 080ꢀ, 0.1 μF, 2ꢀ V, 10%
Kemet
T491C106K016AS
0ꢀ08X7R104K16VP3
ECJ-2VB1E104K
C3, C7 to C10, C16, C302, C32
Presidio Components
Panasonic
C4, C1ꢀ, C22 to C26, C29, (C33)3,
(C34)3, C39
0
10
0
1
1
ꢀ
1
1
1
2
1
0
0
2
2
0
0
1
1
4
2
1
2
0
2
0
1
4
4
(Cꢀ, C6)3
Capacitor, ceramic, SMT 080ꢀ, 0.01 μF, ꢀ0 V, 10%
Capacitor, ceramic, SMT 0ꢀ08, 0.01 μF, ꢀ0 V, 0.2%
Capacitor, ceramic, SMT 080ꢀ, select
Panasonic
ECJ-2YB1H103K
C11 to C14, C17 to 21, C40
Presidio Components
0ꢀ08X7R103M2P3
(C27, 28)
CR13
Diode, dual Schottky HSMS2812, SOT-23, 30 V, 20 mA
Install jumper (across OPT_LAT and BUFLAT)
EMI suppression ferrite chip, SMT 080ꢀ
Header, 6-pin, pin strip, ꢀ mm pitch
Panasonic
MA716-(TX)
E1
F1 to Fꢀ
Steward
HZ080ꢀE601R-00
Zꢀ.ꢀ30.062ꢀ.0
2ꢀ.602.26ꢀ3.0
TSW-120-08-T-D-RA
142-0701-201
1008CT-040X-J
ERJ-2RKF1000V
ERJ-8ENF60R4V
ERJ-6ENF4990V
ERJ-6ENF2ꢀRꢀV
ERJ-6ENF66RꢀV
ERJ-6ENF1000V
ERJ-2RKF1780X
ERJ-6ENF49R9V
EXB2HV101JV
ADT4-1WT
J1-H
Wieland
J1
Pin strip, 6-pin, ꢀ mm pitch
Wieland
J2
Header, 40-pin, male, right angle
Samtec
(J3), J4, Jꢀ
Connector, gold, male, COAX., SMA, vertical
Inductor, SMT, 1008-ct package, 4.7 nH
Resistor, thick film, SMT 0402, 100 Ω, 1/16 W, 1%
Resistor, thick film, SMT 1206, 60.4 Ω, 1/8 W, 1%
Resistor, thick film, SMT 080ꢀ, ꢀ00 Ω, 1/10 W, 1%
Resistor, thick film, SMT 080ꢀ, 2ꢀ.ꢀ Ω, 1/10 W, 1%
Resistor, thick film, SMT 080ꢀ, 66.ꢀ Ω, 1/10 W, 1%
Resistor, thick film, SMT 080ꢀ, 100 Ω, 1/10 W, 1%
Resistor, thick film, SMT 0402, 178 Ω, 1/16 W, 1%
Resistor, thick film, SMT 080ꢀ, 49.9 Ω, 1/10 W, 1%
Resistor array, SMT 0402; 100 Ω; 8 ISO RES.,1/4 W; ꢀ%
Transformer, ADT4-1WT, CDꢀ42, 2 MHz to 77ꢀ MHz
IC, 14-bit, 6ꢀ MSPS ADC, LQFP-ꢀ2
Johnson Components™
Coilcraft®
L1
(R1)3
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Mini-Circuits®
Analog Devices
Fairchild
(R2)
(R3 to Rꢀ)2, (R8)2, R9, R10
R6 and R7
(R11)3, (R13)3
(R12)3, (R14)3
R1ꢀ2
R3ꢀ
RN1 to RN4
T23, T32
U1
AD6644
U2, U7
(U3)2
IC, SOIC-20, OCTAL D-type flip-flop
74LCXꢀ74
IC, SOIC-8, low distortion differential ADC driver
IC, SOT-23, tiny logic UHS 2-input or gate
IC, SOIC-8, differential receiver
Analog Devices
Fairchild
AD8138ARM
NC7SZ32
U4, U6
(U8)3
Motorola
MC100LVEL16
MX04ꢀ-6ꢀ
Y1
Clock oscillator, 6ꢀ MHz
CTS Reeves
AMP
Y1-PS
Pin sockets, closed end
ꢀ-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, Rꢀ, R8, and U3 are not installed. If dc-coupled AIN is required, C30, R1ꢀ, and T3 are not installed.
3 AC-coupled encode is standard: Cꢀ, 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
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