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| 型号： | AD9238BST-40 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 28/48页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT DUAL 40MSPS 64-LQFP |
| 产品变化通告： | AD9238 Lead Discontinuation 12/Sept/2011 |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 40M |
| 数据接口： | 并联 |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 330mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（7x7） |
| 包装： | 托盘 |
| 输入数目和类型： | 4 个单端，单极；2 个差分，单极 |
| 配用： | AD9238BCP-65EBZ-ND - BOARD EVAL WITH AD9238BCP-65 |
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AD9238
Rev. C | Page 34 of 48
DUAL ADC LFCSP PCB
The LFCSP PCB requires a low jitter clock source, analog sources,
and power supplies. The PCB interfaces directly with Analog
Devices standard dual-channel data capture board (HSC-ADC-
EVAL-DC), which together with ADI’s ADC Analyzer software
allows for quick ADC evaluation.
POWER CONNECTOR
Power is supplied to the board via three detachable 4-lead
power strips.
Table 11. Power Connector
Terminal
Comments
Analog supply for ADC
Output supply for ADC
Supply circuitry
VREF
Optional external VREF
+5 V
Optional op amp supply
5 V
Optional op amp supply
1VCC, VDD, and VDL are the minimum required power connections.
ANALOG INPUTS
The evaluation board accepts a 2 V p-p analog input signal
centered at ground at two SMB connectors, Input A and
Input B. These signals are terminated at their respective
transformer primary side. T1 and T2 are wideband RF
transformers that provide the single-ended-to-differential
conversion, allowing the ADC to be driven differentially,
minimizing even-order harmonics. The analog signals can be
low-pass filtered at the transformer secondary to reduce high
frequency aliasing.
OPTIONAL OPERATIONAL AMPLIFIER
The PCB has been designed to accommodate an optional
AD8139 op amp that can serve as a convenient solution for
dc-coupled applications. To use the AD8139 op amp, remove
C14, R4, R5, C13, R37, and R36. Place R22, R23, R30, and R24.
CLOCK
The clock inputs are buffered on the board at U5 and U6. These
gates provide buffered clocks to the on-board latches, U2 and
U4, ADC input clocks, and DRA and DRB that are available at
the output Connector P3, P8. The clocks can be inverted at the
timing jumpers labeled with the respective clocks. The clock
paths also provide for various termination options. The ADC
input clocks can be set to bypass the buffers at P2 to P9 and
P10, P12. An optional clock buffer U3, U7 can also be placed.
The clock inputs can be bridged at TIEA, TIEB (R20, R40) to
allow one to clock both channels from one clock source; however,
optimal performance is obtained by driving J2 and J3.
Table 12. Jumpers
Terminal
Comments
OEB A
Output Enable for A Side
PDWN A
Power-Down A
MUX
Mux Input
SHARED REF
Shared Reference Input
DR A
Invert DR A
LATA
Invert A Latch Clock
ENC A
Invert Encode A
OEB B
Output Enable for B Side
PDWN B
Power-Down B
DFS
Data Format Select
SHARED REF
Shared Reference Input
DR B
Invert DR B
LATB
Invert B Latch Clock
ENC B
Invert Encode B
VOLTAGE REFERENCE
The ADC SENSE pin is brought out to E41, and the internal
reference mode is selected by placing a jumper from E41 to
ground (E27). External reference mode is selected by placing a
jumper from E41 to E25 and E30 to E2. R56 and R45 allow for
programmable reference mode selection.
DATA OUTPUTS
The ADC outputs are latched on the PCB at U2 and U4. The
ADC outputs have the recommended series resistors in line to
limit switching transient effects on ADC performance.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9238BST-40EBZ | 制造商:Analog Devices 功能描述:Evaluation Board For AD9238 Dual A/D Converter ,12-Bit, 20 MSPS/40 MSPS/65 MSPS 制造商:Analog Devices 功能描述:EVAL BD FOR AD9238 DUAL A/D CNVRTR ,12-BIT, 20 MSPS/40 MSPS/ - Bulk |
| AD9238BST-40PCB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9238 Dual A/D Converter ,12-Bit, 20 MSPS/40 MSPS/65 MSPS 制造商:Analog Devices 功能描述:EVAL BD FOR AD9238 DUAL A/D CNVRTR ,12-BIT, 20 MSPS/40 MSPS/ - Bulk |
| AD9238BST-40PCBZ | 制造商:Analog Devices 功能描述:DUAL 12 BIT 3V CMOS 20/40/65 MSPS ADC - Bulk |
| AD9238BST-65 | 功能描述:IC ADC 12BIT DUAL 65MSPS 64-LQFP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 位数:12 采样率（每秒）:3M 数据接口:- 转换器数目:- 功率耗散（最大）:- 电压电源:- 工作温度:- 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-23-6 包装:带卷 (TR) 输入数目和类型:- |
| AD9238BST-65PCB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9238 Dual A/D Converter ,12-Bit, 20 MSPS/40 MSPS/65 MSPS 制造商:Rochester Electronics LLC 功能描述:DUAL 12 BIT 3V CMOS 20/40/65 MSPS ADC - Bulk |
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