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| 型號： | BRICHURE |
| 英文描述： | Brichure - Communications. Video & Imaging - High Speed Solutions Brochure |
| 中文描述： | Brichure -通信。視頻 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 642K |
| 代理商： | BRICHURE |
LNA
RF
BP
FIlter
BP
FIlter
LO
ADC
OPA642
OPA643
OPA687
ADS807
ADS808
ADS851
ADS852
DAC9XX*
PA
BP
FIlter
DSP
DAC
OPA643
OPA687
LO
LO
I
Q
90
°
LNA
BP
FIlter
LO
LO
LO
90
°
LO
LP
Filter
ADC
ADC
LP
Filter
OPA642
ADS803
DAC9XX*
PA
BP
FIlter
LP
Filter
DAC
DSP
DAC
LP
Filter
OPA643
OPA686
I
Q
Baseband Sampling
Burr-Brown offers several op amp and ADC combinations
for baseband sampling. An example of these parts are the
ADS803
and the
OPA642
. The ADS803 gives 80dB of SFDR at 1MHz
and the OPA642 gives in excess of 90dB while having a low voltage
noise of 2.2nV/ Hz, making it compatible with the low noise
of the ADS803.
See Figure 8.
Wideband IF Sampling
Burr-Brown provides a variety of compatible wideband operational
amplifiers and ADCs with the necessary bandwidth and dynamic
range for IF sampling. The
OPA687
gives in excess of 95dB SFDR at
20MHz and the
ADS852
gives in excess of 100dB SFDR. Using this
ADC for undersampling at the 1st IF stage is also achievable due
to the wideband track/hold performance. For instance, the ADS852
track/hold offers a 1GHz bandwidth and a low 0.25ps jitter.
See Figure 7.
www.burr-brown.com
+5V
–5V
OPA687
+5V
–5V
+5V
845
100
100
39pF
2pF
OPA687
845
100
100
806
39pF
2pF
1:2
1:2
50
Source
BP Filter
200
VCM
2Vp-p
ADS852
65Msps
14-Bit
Low Distortion, Low Noise ADC Driver
This
OPA687
application circuit delivers the ultimate in low
distortion when sampling IF signals. With the differential amplifier
delivering 95dB SFDR at 20MHz and the ADC capable of 100dB
SFDR, this circuit meets the stringent requirements for basestations
without the need for dither. Also, the overall gain is 18.5dB with
an amplifier noise figure < 6dB.
See Figure 9.
Fig. 7
Fig. 8
Fig. 9
Wireless Communication Solutions
*Coming Soon. Call factory for availability
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