參數(shù)資料
型號(hào)： THS4304DGKR
廠商： Texas Instruments, Inc.
英文描述： Wideband Operational Amplifier
中文描述： 寬帶運(yùn)算放大器
文件頁(yè)數(shù)： 21/26頁(yè)
文件大小： 869K
代理商： THS4304DGKR
www.ti.com
NON-INVERTING SINGLE-SUPPLY OPERATION
The THS4304 EVM can easily be configured for single 5-V supply operation, as shown in the following
schematic, with no change in performance. This circuit passes dc signals at the input, so care must be taken to
reference (or bias) the input signal to mid-supply.
1
1
2
4
3
3
5
5
+V
S
FB2
V
S
+V
S
GND
GND
J3
J4
J6
J5
GND
TP1
C2
3.3 F
C4
0.1 F
NC
C8
R8
249
249
R7
+V
S
U1
J1
C7
R10
0
0
R1
49.9
THS4304DBV
R2
49.9
C9
0
J2
V
REF
R3
10 k
10 k
R6
+V
S
0.1 F
C5
V
REF
4
+
DIFFERENTIAL ADC DRIVE AMPLIFIER
The circuit shown in Figure 54 is adapted as shown in Figure 55 to provide a high-performance differential
amplifier drive circuit for use with high-performance ADCs, like the ADS5500 (14-bit 125-MSP ADC). For testing
purposes, the circuit uses a transformer to convert the signal from a single-ended source to differential. If the
input signal source in your application is differential and biased to mid-rail, no transformer is required.
THS4304
SLOS436A–MARCH 2004–REVISED JULY 2004
If dc operation is not required, the amplifier can be ac coupled by inserting a capacitor in series with the input
(C7) and output (C9).
Figure 54. Non-Inverting 5-V Single-Supply Amplifier
The circuit employs two amplifiers to provide a differential signal path to the ADS5500. A resistor divider (two
10-k
resistors) is used to obtain a mid-supply reference voltage of 2.5 V (VREF) (the same as shown in the
single-supply circuit of Figure 54). Applying this voltage to the one side of RG and to the positive input of the
operational amplifier (via the center-tap of the transformer) sets the input and output common-mode voltage of
the operational amplifiers to mid-rail to optimize their performance. The ADS5500 requires an input
common-mode voltage of 1.5 V. Due to the mismatch in required common-mode voltage, the signal is ac coupled
from the amplifier output, via the two 1-nF capacitors, to the input of the ADC. The CM voltage of the ADS5500 is
used to bias the ADC input to the required voltage, via the 1-k
resistors. Note: 100-μA common-mode current is
drawn by the ADS5500 input stage (at 125 MSPS). This causes a 100-mV shift in the input common-mode
voltage, which does not impact the performance when driving the input to –1 dB of full scale. To offset this effect,
a voltage divider from the power supply can be used to derive the input common-mode voltage reference.
Because the operational amplifiers are configured as non-inverting, the inputs are high impedance. This is
particularly useful when interfacing to a high-impedance source. In this situation, the amplifiers provide
impedance matching and amplification of the signal.
The SFDR performance of the circuit is shown in the following graph (see Figure 56) and provides for full
performance from the ADS5500 to 40 MHz.
21
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4304DGKRG4 功能描述:高速運(yùn)算放大器 Wideband Operational Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4304DR 功能描述:高速運(yùn)算放大器 Wideband Operational Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4304DRG4 功能描述:高速運(yùn)算放大器 Wideband Operational Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4304-SP 制造商:TI 制造商全稱:Texas Instruments 功能描述:RAD-TOLERANT CLASS V, WIDEBAND OPERATIONAL AMPLIFIER
THS4422IPW 制造商:Texas Instruments 功能描述:DUAL FULLY DIFF RAIL-RAIL IN/OUTPUT AMP - Rail/Tube
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