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参数资料
| 型号： | AD9225AR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/25页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 25MSPS 28-SOIC |
| 标准包装： | 27 |
| 位数： | 12 |
| 采样率（每秒）： | 25M |
| 数据接口： | 并联 |
| 转换器数目： | 7 |
| 功率耗散（最大）： | 373mW |
| 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-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，双极；1 个差分，单极 |
AD9225
–15–
Figure 13 shows the schematic of the suggested transformer circuit.
The circuit uses a minicircuits RF transformer, model #T4-1T,
which has an impedance ratio of 4 (turns ratio of 2). The sche-
matic assumes that the signal source has a 50
W source impedance.
The 1:4 impedance ratio requires the 200
W secondary termination
for optimum power transfer and VSWR. The center tap of the
transformer provides a convenient means of level-shifting the input
signal to a desired common-mode voltage.
VINA
VINB
AD9225
200
49.9
RS
33
CML
MINICIRCUITS
T4-1T
0.1 F
RS
33
CS
Figure 13. Transformer Coupled Input
The configuration in Figure 13 was used to gather the differential
data on the Specifications tables.
Transformers with other turns ratios may also be selected to opti-
mize the performance of a given application. For example, a given
input signal source or amplifier may realize an improvement in
distortion performance at reduced output power levels and signal
swings. For example, selecting a transformer with a higher imped-
ance ratio (e.g., Minicircuits T16-6T with a 1:16 impedance ratio)
effectively steps up the signal level further reducing the driving
requirements of the signal source.
Referring to Figure 13, a series resistors, RS, and shunt capacitor,
CS, were inserted between the AD9225 and the secondary of the
transformer. The value of 33
W was selected to specifically opti-
mize both the THD and SNR performance of the ADC. RS and
CS help provide a low-pass filter to block high frequency noise.
The AD9225 can be easily configured for either a 2 V p-p input
span or a 4.0 V p-p input span by setting the internal reference (see
Table II). Other input spans can be realized with two external gain
setting resistors as shown in Figure 19. Figures 14 and 15 demon-
strate how both spans of the AD9225 achieve the high degree of
linearity and SFDR over a wide range of amplitudes required by
the most demanding communication applications.
Figures 14 and 15 demonstrate the flexibility of common-mode
voltage (transformer center tap) with respect to THD.
COMMON-MODE VOLTAGE (V)
–76
–78
–86
–80
–82
–84
05
1
THD
(dB)
23
4
fIN = 10MHz
fIN = 2.5MHz
Figure 14. Common-Mode Voltage vs. THD
(AIN = 2 V Differential)
COMMON-MODE VOLTAGE (V)
–76
–78
–86
–80
–82
–84
0.5
1.0
THD
(dB)
1.5
fIN = 10MHz
fIN = 2.5MHz
2.0
2.5
3.0
3.5
4.0
4.5
Figure 15. Common-Mode Voltage vs. THD
(AIN = 4 V Differential)
FUND
2ND
3RD
4TH
–119.7
–110.0
–100.0
–90.0
–80.0
–70.0
–60.0
–50.0
–40.0
–30.0
–20.0
–10.0
0.0
2.0E+6
4.0E+6
6.0E+6
8.0E+6
10.0E+6
12.5E+6
fIN = 2.5MHz
fS = 25MHz
Figure 16. Single-Tone Frequency Domain Plot
Common-Mode Voltage = 2.5 V (AIN = 4 V
Differential)
Rev. C
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相关代理商/技术参数 |
参数描述 |
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| AD9225ARRL | 制造商:Analog Devices 功能描述:ADC Single Pipelined 25Msps 12-bit Parallel 28-Pin SOIC W T/R |
| AD9225ARS | 功能描述:IC ADC 12BIT 25MSPS 28-SSOP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD9225ARSRL | 功能描述:IC ADC 12BIT 25MSPS 28-SSOP RoHS:否 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 |
| AD9225ARSZ | 功能描述:IC ADC 12BIT 25MSPS 28-SSOP 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 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD9225ARSZ | 制造商:Analog Devices 功能描述:IC 制造商:Analog Devices 功能描述:IC, ADC, 12BIT, 25MSPS, SSOP-28 |
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