AD9212ABCPZ-40 Analog Devices Inc, AD9212ABCPZ-40 Datasheet - Page 35

• Manufacturer Part Number: AD9212ABCPZ-40
• Description: Octal 10 Bit, 40 MSPS Serial LVDS ADC
• Manufacturer: Analog Devices Inc

Specifications of AD9212ABCPZ-40

• Number Of Bits: 10
• Sampling Rate (per Second): 40M
• Data Interface: Serial, SPI™
• Number Of Converters: 8
• Power Dissipation (max): 560mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
DESIGN GUIDELINES
Before starting design and layout of the AD9212 as a system, it
is recommended that the designer become familiar with these
guidelines, which discuss the special circuit connections and
layout requirements needed for certain pins.
Power and Ground Recommendations
When connecting power to the AD9212, it is recommended
that two separate 1.8 V supplies be used: one for analog (AVDD)
and one for digital (DRVDD). If only one supply is available, it
should be routed to the AVDD first and then tapped off and
isolated with a ferrite bead or a filter choke preceded by
decoupling capacitors for the DRVDD. The user can employ
several different decoupling capacitors to cover both high and
low frequencies. These capacitors should be located close to the
point of entry at the PC board level and close to the parts, with
minimal trace lengths.
A single PC board ground plane should be sufficient when
using the AD9212. With proper decoupling and smart parti-
tioning of the PC board’s analog, digital, and clock sections,
optimum performance can be easily achieved.
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Exposed Paddle Thermal Heat Slug Recommendations
It is required that the exposed paddle on the underside of the
ADC be connected to analog ground (AGND) to achieve the
best electrical and thermal performance of the AD9212. An
exposed continuous copper plane on the PCB should mate to
the AD9212 exposed paddle, Pin 0. The copper plane should
have several vias to achieve the lowest possible resistive thermal
path for heat dissipation to flow through the bottom of the PCB.
These vias should be solder-filled or plugged.
To maximize the coverage and adhesion between the ADC and
PCB, partition the continuous copper plane by overlaying a
silkscreen on the PCB into several uniform sections. This provides
multiple tie points between the ADC and PCB during the
reflow process, whereas using one continuous plane with no
partitions guarantees only one tie point. See Figure 69 for a PCB
layout example. For detailed information on packaging and the
PCB layout of chip scale packages, see the
Note, A Design and Manufacturing Guide for the Lead Frame
Chip Scale Package (LFCSP).
SILKSCREEN PARTITION
PIN 1 INDICATOR
Figure 69. Typical PCB Layout
AN-772 Application
AD9212