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| 型號： | AD9246BCPZ-105 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/44頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 105MSPS 48-LFCSP |
| 設計資源： | Using AD8376 to Drive Wide Bandwidth ADCs for High IF AC-Coupled Appls (CN0002) Driving AD9233/46/54 ADCs in AC-Coupled Baseband Appls (CN0051) |
| 標準包裝： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 105M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 3 |
| 功率耗散（最大）： | 350mW |
| 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： | 48-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 48-LFCSP-VQ（7x7） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 2 個單端，單極；1 個差分，單極 |
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AD9246
Rev. A | Page 16 of 44
DIFFERENTIAL INPUT CONFIGURATIONS
Optimum performance is achieved by driving the AD9246 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 with the CML pin of the
AD9246 (see Figure 37), and the driver can be configured in
a Sallen-Key filter topology to provide band limiting of the
input signal.
AVDD
1V p-p
49.9
523
0.1F
R
C
499
AD8138
05
49
1-
03
8
AD9246
VIN+
VIN–
CML
Figure 37. Differential Input Configuration Using the AD8138
For baseband applications where SNR is a key parameter,
differential transformer coupling is the recommended input
configuration (see Figure 38). The CML voltage can be
connected to the center tap of the secondary winding of the
transformer to bias the analog input.
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 cause core
saturation, which leads to distortion.
2V p-p
49.9
0.1F
R
C
05
49
1-
03
9
AD9246
VIN+
VIN–
CML
Figure 38. Differential Transformer-Coupled Configuration
At input frequencies in the second Nyquist zone and above, the
noise performance of most amplifiers is not adequate to achieve
the true SNR performance of the AD9246. For applications where
SNR is a key parameter, transformer coupling is the recom-
mended input.
For applications where SFDR is a key parameter, differential
double balun coupling is the recommended input configuration
(see Figure 40).
As an alternative to using a transformer-coupled input at
frequencies in the second Nyquist zone, the AD8352 differential
driver can be used (see Figure 41).
In any configuration, the value of the shunt capacitor, C, is
dependent on the input frequency and source impedance and
may need to be reduced or removed. Table 8 displays recom-
mended values to set the RC network. However, these values are
dependent on the input signal and should only be used as a
starting guide.
Table 8. RC Network Recommended Values
Frequency Range (MHz)
R Series (Ω) C Differential (pF)
0 to 70
33
15
70 to 200
33
5
200 to 300
15
5
>300
15
Open
Single-Ended Input Configuration
Although not recommended, it is possible to operate the
AD9246 in a single-ended input configuration, as long as the
input voltage swing is within the AVDD supply. Single-ended
operation can provide adequate performance in cost-sensitive
applications.
In this configuration, SFDR and distortion performance
degrade due to the large input common-mode swing. If the
source impedances on each input are matched, there should be
little effect on SNR performance. Figure 39 details a typical
single-ended input configuration.
1V p-p
R
C
49.9
0.1F
10F
0.1F
AVDD
1k
AD9246
AVDD
05
49
1-
04
2
VIN+
VIN–
Figure 39. Single-Ended Input Configuration
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