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參數(shù)資料
| 型號： | AD9253TCPZ-125EP |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 33/40頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 14BIT SRL 125MSPS 48LFCSP |
| 標準包裝： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 125M |
| 數(shù)據(jù)接口： | LVDS，串行，SPI? |
| 轉換器數(shù)目： | 4 |
| 功率耗散（最大）： | 540mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | * |
| 封裝/外殼： | * |
| 供應商設備封裝： | * |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 4 個差分，雙極 |
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Data Sheet
AD9253
Rev. 0 | Page 39 of 40
APPLICATIONS INFORMATION
DESIGN GUIDELINES
Before starting design and layout of the AD9253 as a system,
it is recommended that the designer become familiar with these
guidelines, which describes the special circuit connections and
layout requirements that are needed for certain pins.
POWER AND GROUND RECOMMENDATIONS
When connecting power to the AD9253, it is recommended
that two separate 1.8 V supplies be used. Use one supply for
analog (AVDD); use a separate supply for the digital outputs
(DRVDD). For both AVDD and DRVDD, several different
decoupling capacitors should be used to cover both high and
low frequencies. Place 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
AD9253. With proper decoupling and smart partitioning of the
PCB analog, digital, and clock sections, optimum performance
is easily achieved.
EXPOSED PAD THERMAL HEAT SLUG
RECOMMENDATIONS
It is required that the exposed pad on the underside of the ADC
be connected to analog ground (AGND) to achieve the best
electrical and thermal performance of the AD9253. An exposed
continuous copper plane on the PCB should mate to the
AD9253 exposed pad, 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
several tie points between the ADC and PCB during the reflow
process, whereas using one continuous plane with no partitions
only guarantees one tie point. See Figure 75 for a PCB layout
example. For detailed information on packaging and the PCB
layout of chip scale packages, see the AN-772
,
A Design and Manufacturing Guide for the Lead Frame Chip
Scale Package (LFCSP), at www.analog.com.
SILKSCREEN PARTITION
PIN 1 INDICATOR
1
0065-
0
80
Figure 75. Typical PCB Layout
VCM
The VCM pin should be decoupled to ground with a 0.1 μF
capacitor.
REFERENCE DECOUPLING
The VREF pin should be externally decoupled 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
AD9253 to keep these signals from transitioning at the con-
verter inputs during critical sampling periods.
CROSSTALK PERFORMANCE
The AD9253 is available in a 48-lead LFCSP package with the
input pairs on either corner of the chip. See Figure 9 for the pin
configuration. To maximize the crosstalk performance on the
board, add grounded filled vias in between the adjacent
channels as shown in Figure 76.
GROUNDED
FILLED VIAS
FOR ADDED
CROSSTALK
ISOLATION
VIN
CHANNEL B
VIN
CHANNEL C
VIN
CHANNEL A
VIN
CHANNEL D
PIN 1
1
0065-
0
88
Figure 76. Layout Technique to Maximize Crosstalk Performance
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9253TCPZR7-125EP | 制造商:Analog Devices 功能描述:14 BIT 125MSPS QUAD ADC 制造商:Analog Devices 功能描述:14 BIT 125MSPS QUAD ADC - Tape and Reel 制造商:Analog Devices 功能描述:IC ADC 14BIT SRL 125MSPS 48LFCSP 制造商:Analog Devices Inc. 功能描述:Analog to Digital Converters - ADC 14 Bit 125Msps Quad ADC 制造商:Analog Devices 功能描述:CONVERTER - ADC |
| AD9254 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 150 MSPS, 1.8 V Analog-to-Digital Converter |
| AD9254-150EBZ | 制造商:Analog Devices 功能描述:EVAL BD FOR AD9254 - Bulk 制造商:Analog Devices 功能描述:EVALUATION CARD ((NS)) |
| AD9254-150EBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 150 MSPS, 1.8 V Analog-to-Digital Converter |
| AD9254BCPZ-150 | 功能描述:模數(shù)轉換器 - ADC 1.8V 14Bit 150 MSPS ADC RoHS:否 制造商:Analog Devices 通道數(shù)量: 結構: 轉換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風格: 封裝 / 箱體: |
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