參數(shù)資料
型號(hào): THS4211DRB
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: PLASTIC, MSOP-8
文件頁(yè)數(shù): 14/40頁(yè)
文件大?。?/td> 1013K
代理商: THS4211DRB
THS4211
THS4215
SLOS400C SEPTEMBER 2002 REVISED JANUARY 2004
www.ti.com
21
_
+
THS4211
50
Source
392
_
+
5 V
196
15 pF
392
196
24.9
15 pF
14-Bit, 62 Msps
ADS5422
(1:4
)
1:2
5 V
24.9
THS4211
VCM
Figure 78. A Linear, Low Noise, High Gain
ADC Preamplifier
The second circuit depicts single-ended ADC drive. While
not recommended for optimum performance using
converters with differential inputs, satisfactory perfor-
mance can sometimes be achieved with single-ended
input drive. An example circuit is shown here for reference.
_
+
THS4211
392
ADS807
12-Bit,
53 Msps
Rf
+5 V
392
49.9
VI
Rg
5 V
50
Source
RISO 0.1 F
16.5
68 pf
0.1
F
IN
CM
1.82 k
RT
NOTE: For best performance, high-speed ADCs should be driven
differentially. See the THS4500 family of devices for more
information.
Figure 79. Driving an ADC With a
Single-Ended Input
Using the THS4211 as a DAC Output Buffer
Two example circuits are presented here showing the
THS4211 buffering the output of a digital-to-analog
converter. The first circuit performs a differential to
single-ended conversion with the THS4211 configured as
a difference amplifier. The difference amplifier can double
as the termination mechanism for the DAC outputs as well.
392
_
+
THS4211
49.9
100
392
100
+5 V
5 V
14-Bit,
400 MSps
DAC5675
RF
LO
196
392
392
3.3 V
Figure 80. Differential to Single-Ended
Conversion of a High-Speed DAC Output
For cases where a differential signaling path is desirable,
a pair of THS4211 amplifiers can be used as output
buffers. The circuit depicts differential drive into a mixer’s
IF inputs, coupled with additional signal gain and filtering.
392
_
+
49.9
100
100
14-Bit,
400 MSps
DAC5675
3.3 V
CF
1 nF
392
49.9
1 nF
CF
392
392
_
+
THS4211
RF(out)
IF+
IF
100
1 nF
Figure 81. Differential Mixer Drive Circuit Using
the DAC5675 and the THS4211
Active Filtering With the THS4211
High-frequency active filtering with the THS4211 is
achievable due to the amplifier’s high slew-rate, wide
bandwidth, and voltage feedback architecture. Several
options are available for high-pass, low-pass, bandpass,
and bandstop filters of varying orders. A simple two-pole
low pass filter is presented here as an example, with two
poles at 100 MHz.
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