AD6644ASTZ-65 Analog Devices Inc, AD6644ASTZ-65 Datasheet - Page 18

• Manufacturer Part Number: AD6644ASTZ-65
• Description: IC ADC 14BIT 65MSPS CMOS 52-LQFP
• Manufacturer: Analog Devices Inc

Specifications of AD6644ASTZ-65

• Data Interface: Parallel
• Number Of Bits: 14
• Sampling Rate (per Second): 65M
• Number Of Converters: 4
• Power Dissipation (max): 1.3W
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -25°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 52-LQFP
• Resolution (bits): 14bit
• Sampling Rate: 65MSPS
• Input Channel Type: Differential
• Supply Voltage Range - Digital: 3V To 3.6V
• Supply Current: 245mA
• Number Of Elements: 1
• Resolution: 14Bit
• Architecture: Pipelined
• Sample Rate: 65MSPS
• Input Polarity: Unipolar
• Input Type: Voltage
• Rated Input Volt: ±1.1V
• Differential Input: Yes
• Power Supply Requirement: Analog and Digital
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.85V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Power Dissipation: 1.5W
• Differential Linearity Error: -1LSB/1.5LSB
• Integral Nonlinearity Error: ±0.5LSB(Typ)
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 52
• Package Type: LQFP
• Input Signal Type: Differential
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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.
Table 10. AD6644/PCB Bill of Materials
Qty.
1
4
8
9
0
10
0
1
1
5
1
1
1
2
1
0
0
2
2
0
0
1
1
4
2
1
2
0
2
0
1
4
4
1
2
3
Reference designators in parentheses are not installed on standard units.
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.
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.
Reference ID
PCB
C1, C2, C31, C38
C3, C7 to C10, C16, C30
C4, C15, C22 to C26, C29, (C33)
(C34)
(C5, C6)
C11 to C14, C17 to 21, C40
(C27, 28)
CR1
E1
F1 to F5
J1-H
J1
J2
(J3), J4, J5
L1
(R1)
(R2)
(R3 to R5)
R6 and R7
(R11)
(R12)
R15
R35
RN1 to RN4
T2
U1
U2, U7
(U3)
U4, U6
(U8)
Y1
Y1-PS
STDOFF
3
, T3
2
3
3
2
3
3
3
3
, C39
, (R13)
, (R14)
2
3
2
, (R8)
3
3
1
2
, R9, R10
2
, C32
3
,
Description
Printed circuit board, AD6644/AD6645 engineering
evaluation board
Capacitor, tantalum, SMT BCAPTAJC, 10 μF, 16 V, 10%
Capacitor, ceramic, SMT 0508, 0.1 μF, 16 V, 10%
Capacitor, ceramic, SMT 0805, 0.1 μF, 25 V, 10%
Capacitor, ceramic, SMT 0805, 0.01 μF, 50 V, 10%
Capacitor, ceramic, SMT 0805, select
Diode, dual Schottky HSMS2812, SOT-23, 30 V, 20 mA
Install jumper (across OPT_LAT and BUFLAT)
EMI suppression ferrite chip, SMT 0805
Header, 6-pin, pin strip, 5 mm pitch
Pin strip, 6-pin, 5 mm pitch
Header, 40-pin, male, right angle
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 0805, 500 Ω, 1/10 W, 1%
Resistor, thick film, SMT 0805, 25.5 Ω, 1/10 W, 1%
Resistor, thick film, SMT 0805, 66.5 Ω, 1/10 W, 1%
Resistor, thick film, SMT 0805, 100 Ω, 1/10 W, 1%
Resistor, thick film, SMT 0402, 178 Ω, 1/16 W, 1%
Resistor, thick film, SMT 0805, 49.9 Ω, 1/10 W, 1%
Resistor array, SMT 0402; 100 Ω; 8 ISO RES.,1/4 W; 5%
Transformer, ADT4-1WT, CD542, 2 MHz to 775 MHz
IC, 14-bit, 65 MSPS ADC, LQFP-52
IC, SOIC-20, OCTAL D-type flip-flop
IC, SOIC-8, low distortion differential ADC driver
IC, SOT-23, tiny logic UHS 2-input or gate
IC, SOIC-8, differential receiver
Clock oscillator, 65 MHz
Pin sockets, closed end
Circuit board support
Capacitor, ceramic, SMT 0508, 0.01 μF, 50 V, 0.2%
Rev. D | Page 18 of 24
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.
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