參數(shù)資料
型號: AD9239BCPZ-170
廠商: Analog Devices Inc
文件頁數(shù): 13/40頁
文件大?。?/td> 0K
描述: IC ADC 12BIT DUAL 170MSPS 72PIN
標(biāo)準(zhǔn)包裝: 1
位數(shù): 12
采樣率(每秒): 170M
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 4
功率耗散(最大): 1.22W
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: 72-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 72-LFCSP
包裝: 托盤
輸入數(shù)目和類型: 8 個單端,單極;4 個差分,單極
AD9239
Data Sheet
Rev. C | Page 20 of 40
For applications where SNR is a key parameter, differential
transformer coupling is the recommended input configuration
(see Figure 47 to Figure 49), to achieve the true performance of
the AD9239.
Regardless of the configuration, the value of the shunt capacitor, C,
is dependent on the input frequency and may need to be reduced
or removed.
*CDIFF IS OPTIONAL
1.25V p-p
33
*CDIFF
C
50Ω
0.1μF
AGND
ADT1-1WT
1:1 Z RATIO
VIN – x
ADC
AD9239
VIN + x
C
0.1F
06980-
013
Figure 47. Differential Transformer-Coupled Configuration
for Baseband Applications
ADC
AD9239
1.25V p-p
2.2pF
0.1μF
ADT1-1WT
1:1 Z RATIO
L
0.1μF
L
33
33
250
65
VIN + x
VIN – x
06980-
014
Figure 48. Differential Transformer-Coupled Configuration
for Wideband IF Applications
ADC
AD9239
1.25V p-p
L
0.1μF
ADT1-1WT
1:1 Z RATIO
0.1μF
33
33
250
VIN + x
VIN – x
06980-
015
Figure 49. Differential Transformer-Coupled Configuration
for Narrow-Band IF Applications
1.25V p-p
33
33
0.1F
66Ω
VIN – x
ADC
AD9239
VIN + x
4.7pF
06980-
017
0.1F
BALUN
1:1 Z
BALUN
1:1 Z
Figure 50. Differential Balun-Coupled Configuration
for Wideband IF Applications
Single-Ended Input Configuration
A single-ended input may provide adequate performance in
cost-sensitive applications. In this configuration, SFDR and
distortion performance can degrade due to input common-mode
swing mismatch. If the application requires a single-ended input
configuration, ensure that the source impedances on each input
are well matched in order to achieve the best possible performance.
A full-scale input of 1.25 V p-p can be applied to the ADC’s
VIN + x pin while the VIN x pin is terminated. Figure 51
details a typical single-ended input configuration.
1.25V p-p
33
33
49.9Ω
0.1F
25Ω
VIN – x
ADC
AD9239
VIN + x
*CDIFF
C
*CDIFF IS OPTIONAL
C
06980-
016
Figure 51. Single-Ended Input Configuration
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