參數(shù)資料
型號(hào)： 5962-0722201VFA
廠商： TEXAS INSTRUMENTS INC
元件分類： 運(yùn)算放大器
英文描述： OP-AMP, 5500 uV OFFSET-MAX, 3000 MHz BAND WIDTH, CDFP16
封裝： CERAMIC, DFP-16
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 840K
代理商： 5962-0722201VFA
www.ti.com
THS4511 + ADS5500 Combined Performance
THS4511 + ADS5424 Combined Performance
.
2 7 pF
0.1 F
m
14 bit,
105 MSPS
AIN+
AIN– VBG
ADS5424
5V
THS4511
CM
348 W
100 W
69.8 W
VIN
From
50
source
W
225 W
49.9 W
49 .9 W
0.22 F
m
0.1 F
m
2.7pF
0.1 F
m
AIN +
AIN - CM
ADS5500
5V
THS4511
CM
348 W
100 W
69.8 W
49.9 W
VIN
From
50
source
W
100 W
14bit,
125MSPS
100 W
0.22 F
m
0.22 F
m
0.22 F
m
SLOS538A – SEPTEMBER 2007 – REVISED OCTOBER 2007
The THS4511 is designed to be a high-performance
Figure 44 shows the THS4511 driving the ADS5424
drive amplifier for high-performance data converters
ADC.
like the ADS5500 14 bit 125 MSPS ADC. Figure 43
The THS4511 amplifier provides 10 dB of gain,
shows a circuit combining the two devices. The
converts the single-ended input to differential, and
THS4511 amplifier circuit provides 10 dB of gain and
sets the proper input common-mode voltage to the
converts the single-ended input signal to a differential
ADS5424. Input termination and circuit testing is the
output signal. The default common-mode output of
same as described above for the THS4511 +
the THS4511 (2.5 V) is not compatible with the
ADS5500 circuit.
required
common-mode
input
of
the
ADS5500
(1.55 V), so dc-blocking capicitors are added (0.22
The 225
resistors and 2.7 pF capacitor between
F). Note that a biasing circuit (not shown in
the THS4511 outputs and ADS5424 inputs (along
needed
to
provide
the
required
with the input capacitance of the ADC) limit the
common-mode, dc-input for the ADS5500. The 100
bandwidth of the signal to about 100MHz (–3dB).
resistors and 2.7 pF capacitor between the THS4511
When the THS4511 is operated from a single power
outputs and ADS5500 inputs, along with the input
supply with VS+ = 5 V and VS- = ground, the 2.5 V
capacitance of the ADS5500, limit the bandwidth of
output common-mode voltage is compatable with the
the signal to 115 MHz (–3 dB). For testing, a signal
recommended
value
of
the
ADS5424
input
generator
is
used
for
the
signal
source.
The
common-mode voltage (2.4 V).
generator is an ac-coupled 50
source. A band-pass
filter is inserted in series with the input to reduce
harmonics and noise from the signal source. Input
termination is accomplished via the 69.8
resistor
and 0.22
μF capacitor to ground in conjunction with
the input impedance of the amplifier circuit. A 0.22
μF
capacitor and 49.9
resistor are inserted to ground
across the 69.8
resistor and 0.22 μF capacitor on
the alternate input to balance the circuit. Gain is a
function of the source impedance, termination, and
348
feedback resistor. See Table 1 for component
values to set proper 50
termination for other
common gains.
Figure 44. THS4511 + ADS5424 Circuit
Figure 43. THS4511 + ADS5500 Circuit
18
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): THS4511–SP
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