AD9231BCPZRL7-65 datasheet(35/37 Pages) AD

Part #	AD9231BCPZRL7-65

Description	12-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter

Download	37 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

Logo

35 / 37 page

AD9231

Data Sheet

Rev. B | Page 34 of 36

APPLICATIONS INFORMATION

DESIGN GUIDELINES

Before starting design and layout of the AD9231 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 AD9231, it is strongly

recommended that two separate supplies be used. Use one 1.8 V

supply for analog (AVDD); use a separate 1.8 V to 3.3 V supply for

the digital output supply (DRVDD). If a common 1.8 V AVDD

and DRVDD supply must be used, the AVDD and DRVDD

domains must be isolated with a ferrite bead or filter choke and

separate decoupling capacitors. Several different decoupling

capacitors can be used to cover both high and low frequencies.

Locate these capacitors close to the point of entry at the PCB

level and close to the pins of the part, with minimal trace length.

A single PCB ground plane should be sufficient when using the

AD9231. With proper decoupling and smart partitioning of the

PCB analog, digital, and clock sections, optimum performance

is easily achieved.

Exposed Paddle Thermal Heat Sink Recommendations

The exposed paddle (Pin 0) is the only ground connection for

the AD9231; therefore, it must be connected to analog ground

(AGND) on the customer’s PCB. To achieve the best electrical

and thermal performance, mate an exposed (no solder mask)

continuous copper plane on the PCB to the AD9231 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. Fill or plug these vias

with nonconductive epoxy.

To maximize the coverage and adhesion between the ADC and

the PCB, a silkscreen should be overlaid to partition the continuous

plane on the PCB into several uniform sections. This provides

several tie points between the ADC and the PCB during the reflow

process. Using one continuous plane with no partitions guarantees

only one tie point between the ADC and the PCB. For detailed

information about packaging and PCB layout of chip scale

packages, see the AN-772 Application Note, A Design and

Manufacturing Guide for the Lead Frame Chip Scale Package

(LFCSP), at www.analog.com.

VCM

The VCM pin should be decoupled to ground with a 0.1 μF

capacitor, as shown in Figure 42.

RBIAS

The AD9231 requires that a 10 kΩ resistor be placed between

the RBIAS pin and ground. This resistor sets the master current

reference of the ADC core and should have at least a 1% tolerance.

Reference Decoupling

Externally decoupled the VREF pin to ground with a low ESR,

1.0 μF capacitor in parallel with a low ESR, 0.1 μF ceramic

capacitor.

SPI Port

The SPI port should not be active during periods when the full

dynamic performance of the converter is required. Because the

SCLK, CSB, and SDIO signals are typically asynchronous to the

ADC clock, noise from these signals can degrade converter

performance. If the on-board SPI bus is used for other devices,

it may be necessary to provide buffers between this bus and the

AD9231 to keep these signals from transitioning at the converter

inputs during critical sampling periods.

Similar Part No. - AD9231BCPZRL7-65

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD9231BCPZRL7-65	1Mb / 36P	12-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter REV. 0

More results

Similar Description - AD9231BCPZRL7-65

Manufacturer	Part #	Datasheet	Description
Analog Devices	AD9231	1Mb / 36P	12-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter REV. 0
	AD9629	984Kb / 32P	12-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS 1.8 V Analog-to-Digital Converter REV. 0
	AD9629	906Kb / 33P	12-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Analog-to-Digital Converter
	AD9629BCPZ-80	984Kb / 32P	12-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Analog-to-Digital Converter REV. 0
	AD9251	1Mb / 36P	14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter REV. 0
	AD9204	1Mb / 36P	10-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter REV. 0
	AD9609	1Mb / 32P	10-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS 1.8 V Analog-to-Digital Converter REV. 0
	AD9266BCPZ-20	870Kb / 32P	16-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Analog-to-Digital Converter REV. A
	AD9609	1Mb / 33P	10-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Analog-to-Digital Converter
	AD9650	1Mb / 44P	16-Bit, 25 MSPS/65 MSPS/80 MSPS/105 MSPS, 1.8 V Dual Analog-to-Digital Converter (ADC) REV. 0

More results

AD9231BCPZRL7-65 Datasheet(PDF) 35 Page - Analog Devices

AD9231BCPZRL7-65 Datasheet(HTML) 35 Page - Analog Devices

Similar Part No. - AD9231BCPZRL7-65

Similar Description - AD9231BCPZRL7-65

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Datasheet Download

Link URL