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| 型号： | AD9235BRUZ-65 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/40页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 65MSPS 28-TSSOP |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 65M |
| 数据接口： | 并联 |
| 转换器数目： | 3 |
| 功率耗散（最大）： | 300mW |
| 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： | 28-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 28-TSSOP |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
| 产品目录页面： | 780 (CN2011-ZH PDF) |
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AD9235
Data Sheet
Rev. D | Page 16 of 40
The internal voltage reference can be pin-strapped to fixed
values of 0.5 V or 1.0 V, or adjusted within the same range as
discussed in the Internal Reference Connection section. Maxi-
mum SNR performance is achieved with the AD9235 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.
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:
VCMMIN = VREF/2
VCMMAX = (AVDD + VREF)/2
The minimum common-mode input level allows the AD9235 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
AD9235 then accepts an input signal varying between 2 V and
0 V. In the single-ended configuration, distortion performance
may degrade significantly as compared to the differential case.
However, the effect is less noticeable at lower input frequencies and
in the lower speed grade models (AD9235-40 and AD9235-20).
Differential Input Configurations
As previously detailed, optimum performance is achieved while
driving the AD9235 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.
AD9235
VIN+
VIN–
AVDD
1Vp-p
49.9
523
1k
1k
0.1
F
22
22
15pF
499
499
499
AGND
02461-035
AD8138
Figure 35. 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 AD9235. This is especially true in IF
undersampling applications where frequencies in the 70 MHz to
100 MHz range are being sampled. For these applications,
differential transformer coupling is the recommended input
configuration, as shown in Figure 36.
02461-036
AD9235
VIN+
VIN–
AVDD
49.9
22
22
15pF
AGND
1k
1k
0.1
F
2Vp-p
Figure 36. 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 degra-
dation in SFDR and in distortion performance due to the large
input common-mode swing. However, if the source
impedances on each input are matched, there should be little
effect on SNR performance. Figure 37 details a typical single-
ended input configuration.
02461-037
AD9235
VIN+
VIN–
AVDD
49.9
22
22
15pF
AGND
1k
1k
1k
1k
2Vp-p
0.33
F
0.1
F
10
F
Figure 37. Single-Ended Input Configuration
CLOCK INPUT 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 AD9235 contains a clock duty cycle stabilizer
(DCS) 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 perfor-
mance of the AD9235. As shown in Figure 30, noise and distor-
tion performance are nearly flat over a 30% range of duty cycle.
The duty cycle stabilizer uses a delay-locked loop (DLL) to
create the nonsampling edge. As a result, any changes to the
sampling frequency require approximately 100 clock cycles to
allow the DLL to acquire and lock to the new rate.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9235BRUZ-65 | 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD9235BRUZRL7-20 | 功能描述:IC ADC 12BIT SGL 20MSPS 28TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
| AD9235BRUZRL7-40 | 功能描述:IC ADC 12BIT SGL 40MSPS 28TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD9235BRUZRL7-65 | 功能描述:IC ADC 12BIT SGL 65MSPS 28TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD9235XCP-65 | 制造商:Analog Devices 功能描述:12-BIT 3V 20 MSPS ADC - Bulk |
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