參數(shù)資料
型號(hào)： AD9226ARS
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12BIT 65MSPS 28-SSOP
產(chǎn)品變化通告： Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 12
采樣率（每秒）： 65M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 3
功率耗散（最大）： 475mW
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-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 28-SSOP
包裝： 管件
輸入數(shù)目和類型： 2 個(gè)單端，單極；1 個(gè)差分，單極
REV. B
AD9226
–15–
10 F
VINA
VREF
AD9226
VINB
0.5V
SENSE
REFCOM
0.1 F
10 F
0.1 F
15pF
1.5V
33
1V
0.1 F
CAPT
CAPB
Figure 5a. 1 V Single-Ended Input, Common-Mode
Voltage = 1 V
10 F
VINA
VREF
AD9226
VINB
0.75V
SENSE
0.1 F
10 F
0.1 F
15pF
1.25V
33
1V
0.1 F
49.9
1.25V
0.75V
CAPB
CAPT
Figure 5b. 1 V Differential Input, Common-Mode
Voltage = 1 V
10 F
VINA
VREF
AD9226
VINB
1.5V
SENSE
0.1 F
10 F
0.1 F
15pF
2.5V
33
2V
0.1 F
49.9
2.5V
1.5V
CAPT
CAPB
Figure 5c. 2 V Differential Input, Common-Mode
Voltage = 2 V
10 F
VINA
VREF
AD9226
VINB
1.0V
SENSE
REFCOM
0.1 F
10 F
0.1 F
15pF
3.0V
33
2V
0.1 F
CAPT
CAPB
Figure 5d. 2 V Single-Ended Input, Common-Mode
Voltage = 2 V
10 F
VINA
VREF
AD9226
(LQFP)
VINB
2.0V
SENSE
0.1 F
10 F
0.1 F
15pF
3.0V
33
2V
0.1 F
49.9
3.0V
2.0V
2.5V
CMLEVEL
0.1 F
2.5V
CAPB
CAPT
Figure 5e. 2 V Differential Input, Common-Mode
Voltage = 2.5 V
10 F
VINA
VREF
AD9226
VINB
2.0V
SENSE
0.1 F
10 F
0.1 F
15pF
2.75V
33
1V
0.1 F
49.9
2.75V
2.25V
2.5V
CAPT
CAPB
0.1 F
2.5V
AVDD
10k
Figure 5f. 1 V Differential Input, Common-Mode
Voltage = 2.5 V (Recommended for IF Undersampling)
The differential input characterization for this data sheet was
performed using the configuration shown in Figure 7.
Since not all applications have a signal preconditioned for
differential operation, there is often a need to perform a single-
ended-to-differential conversion. In systems that do not need to
be dc-coupled, an RF transformer with a center tap is the best
method to generate differential inputs for the AD9226. It pro-
vides all the benefits of operating the ADC in the differential
mode without contributing additional noise or distortion. An RF
transformer also has the added benefit of providing electrical
isolation between the signal source and the ADC. An improvement
in THD and SFDR performance can be realized by operating
the AD9226 in the differential mode. The performance enhance-
ment between the differential and single-ended mode is most
noteworthy as the input frequency approaches and goes beyond
the Nyquist frequency (i.e., fIN > FS /2).
The circuit shown in Figure 6a is an ideal method of applying
a differential dc drive to the AD9226. It uses an AD8138 to
derive a differential signal from a single-ended one. Figure 6b
illustrates its performance.
Figure 7 presents the schematic of the suggested transformer
circuit. The circuit uses a Minicircuits RF transformer, model
T1-1T, which has an impedance ratio of four (turns ratio of 2).
The schematic assumes that the signal source has a 50
source
impedance. The center tap of the transformer provides a con-
venient means of level-shifting the input signal to a desired
common-mode voltage. In Figure 7 the transformer centertap
is connected to a resistor divider at the midsupply voltage.
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