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| 型号： | AD9215BRU-105 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | ADC |
| 英文描述： | Circular Connector; No. of Contacts:15; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-15 |
| 中文描述： | 1-CH 10-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封装： | PLASTIC, MO-153AE, TSSOP-28 |
| 文件页数： | 15/36页 |
| 文件大小： | 1416K |
| 代理商： | AD9215BRU-105 |
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AD9215
SNR performance is achieved with the AD9215 set to the largest
input span of 2 V p-p. The relative SNR degradation is 3 dB
when changing from 2 V p-p mode to 1 V p-p mode.
Rev. A | Page 15 of 36
The SHA may be driven from a source that keeps the signal
peaks within the allowable range for the selected reference volt-
age. The minimum and maximum common-mode input levels
are defined as
VCM
MIN
=
VREF
/2
VCM
MAX
= (
AVDD
+
VREF
)/2
The minimum common-mode input level allows the AD9215 to
accommodate ground-referenced inputs.
Although optimum performance is achieved with a differential
input, a single-ended source may be driven into VIN+ or VIN.
In this configuration, one input accepts the signal, while the
opposite input should be set to midscale by connecting it to an
appropriate reference. For example, a 2 V p-p signal may be
applied to VIN+ while a 1 V reference is applied to VIN. The
AD9215 then accepts a signal varying between 2 V and 0 V. In
the single-ended configuration, distortion performance may
degrade significantly as compared to the differential case. How-
ever, the effect is less noticeable at lower input frequencies.
Differential Input Configurations
As previously detailed, optimum performance is achieved while
driving the AD9215 in a differential input configuration. For
baseband applications, the AD8138 differential driver provides
excellent performance and a flexible interface to the ADC. The
output common-mode voltage of the AD8138 is easily set to
AVDD
/2, and the driver can be configured in a Sallen Key filter
topology to provide band limiting of the input signal.
0
AD8138
AD9215
VIN+
VIN–
AVDD
AGND
1V p-p
R
R
C
C
499
499
499
523
49.9
1k
1k
0.1
μ
F
V
CM
Figure 32. Differential Input Configuration Using the AD8138
At input frequencies in the second Nyquist zone and above, the
performance of most amplifiers is not adequate to achieve the
true performance of the AD9215. This is especially true in IF
undersampling applications where frequencies in the 70 MHz to
200 MHz range are being sampled. For these applications, differ-
ential transformer coupling is the recommended input configura-
tion. The value of the shunt capacitor is dependant on the input
frequency and source impedance and should be reduced or re-
moved. An example of this is shown in Figure 33.
0
AD9215
VIN+
VIN–
AVDD
AGND
2Vp-p
R
R
C
C
49.9
0.1
μ
F
AVDD
1k
1k
Figure 33. Differential Transformer-Coupled Configuration
The signal characteristics must be considered when selecting a
transformer. Most RF transformers saturate at frequencies
below a few MHz, and excessive signal power can also cause
core saturation, which leads to distortion.
Single-Ended Input Configuration
A single-ended input may provide adequate performance in
cost-sensitive applications. In this configuration, there is a deg-
radation in SFDR and distortion performance due to the large
input common-mode swing. However, if the source impedances
on each input are kept matched, there should be little effect on
SNR performance. Figure 34 details a typical single-ended input
configuration.
0
2V p-p
R
R
C
C
49.9
0.1
μ
F
10
μ
F
10
μ
F
0.1
μ
F
AD9215
VIN+
VIN–
AVDD
AGND
AVDD
1k
1k
1k
1k
Figure 34. Single-Ended Input Configuration
CLOCK INPUT AND CONSIDERATIONS
Typical high speed ADCs use both clock edges to generate a
variety of internal timing signals, and as a result may be sensi-
tive to clock duty cycle. Commonly, a 5% tolerance is required
on the clock duty cycle to maintain dynamic performance char-
acteristics. The AD9215 contains a clock duty cycle stabilizer
that retimes the nonsampling edge, providing an internal clock
signal with a nominal 50% duty cycle. This allows a wide range
of clock input duty cycles without affecting the performance of
the AD9215. As shown in Figure 25, noise and distortion per-
formance are nearly flat over a 50% range of duty cycle. For best
ac performance, enabling the duty cycle stabilizer is recom-
mended for all applications.
The duty cycle stabilizer uses a delay-locked loop (DLL) to cre-
ate the nonsampling edge. As a result, any changes to the sam-
pling frequency require approximately 100 clock cycles to allow
the DLL to acquire and lock to the new rate.
相关PDF资料 |
PDF描述 |
|---|---|
| AD9215BRU-105EB | Circular Connector; No. of Contacts:15; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:15-15 |
| AD9215BRU-65 | Circular Connector; No. of Contacts:18; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:15-18 |
| AD9215BRU-65EB | Circular Connector; No. of Contacts:18; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:15-18 |
| AD9215BRU-80 | Circular Connector; No. of Contacts:18; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:15-18 |
| AD9215BRU-80EB | Circular Connector; No. of Contacts:18; Series:D38999; Body Material:Metal; Connecting Termination:Crimp; Connector Shell Size:15; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:15-18 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9215BRU-105EB | 制造商:AD 制造商全称:Analog Devices 功能描述:10-Bit, 65/80/105 MSPS, 3V A/D Converter |
| AD9215BRU-65 | 功能描述:IC ADC 10BIT 65MSPS 3V 28-TSSOP 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:- |
| AD9215BRU-65EB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9215 3 V A/D Converter ,10-Bit, 65/80/105 MSPS 制造商:Analog Devices 功能描述:EVAL BD FOR AD9215 3V A/D CNVRTR ,10-BIT, 65/80/105 MSPS - Rail/Tube |
| AD9215BRU-80 | 功能描述:IC ADC 10BIT 80MSPS 3V 28-TSSOP 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:- |
| AD9215BRU-80EB | 制造商:Analog Devices 功能描述:Evaluation Board For AD9215 3 V A/D Converter ,10-Bit, 65/80/105 MSPS 制造商:Analog Devices 功能描述:EVAL BD FOR AD9215 3V A/D CNVRTR ,10-BIT, 65/80/105 MSPS - Rail/Tube |
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