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參數(shù)資料
| 型號： | AD9231BCPZRL7-80 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 28/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 80MSPS 64LFCSP |
| 標(biāo)準(zhǔn)包裝： | 750 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 80M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 166.5mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 64-LFCSP-VQ（9x9） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 4 個(gè)單端，單極；2 個(gè)差分，單極 |
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AD9231
Rev. A | 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.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD9233 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Analog-to-Digital Converter |
| AD9233-105EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Analog-to-Digital Converter |
| AD9233-105EBZ | 制造商:Analog Devices 功能描述: |
| AD9233-125EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit, 80 MSPS/105 MSPS/125 MSPS, 1.8 V Analog-to-Digital Converter |
| AD9233-125EBZ | 功能描述:BOARD EVALUATION FOR AD9233 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
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