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參數(shù)資料
| 型號： | AD9225AR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 12BIT 25MSPS 28-SOIC |
| 標(biāo)準(zhǔn)包裝： | 27 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 25M |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 7 |
| 功率耗散（最大）： | 373mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個單端，雙極；1 個差分，單極 |
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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參數(shù)描述 |
|---|---|
| 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 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| AD9225ARSRL | 功能描述:IC ADC 12BIT 25MSPS 28-SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD9225ARSZ | 功能描述:IC ADC 12BIT 25MSPS 28-SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個單端，單極 產(chǎn)品目錄頁面:892 (CN2011-ZH PDF) 其它名稱: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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