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參數(shù)資料
| 型號： | ADA4891-1ARJ-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADA4891-1ARJ |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 每 IC 通道數(shù)： | 1 - 單 |
| 放大器類型： | 通用 |
| 板類型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | SOT-23-5 封裝 |
Data Sheet
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Rev. E | Page 15 of 24
APPLICATIONS INFORMATION
USING THE ADA4891
Understanding the subtleties of the ADA4891 family of amplifiers
provides insight into how to extract the peak performance from
the device. The following sections describe the effect of gain,
component values, and parasitics on the performance of the
ADA4891. The wideband, noninverting gain configuration of
the ADA4891 is shown in Figure 50; the wideband, inverting
gain configuration of the ADA4891 is shown in Figure 51.
WIDEBAND, NONINVERTING GAIN OPERATION
08054-
023
ADA4891
RF
RG
RT
50
SOURCE
RL
+VS
–VS
10F
0.1F
VI
VO
10F
0.1F
Figure 50. Noninverting Gain Configuration
respectively. Together, RF and RG determine the noise gain of the
amplifier. The value of RF defines the 0.1 dB bandwidth (for
more information, see the Effect of RF on 0.1 dB Gain Flatness
section). Typical RF values range from 549 Ω to 698 Ω for the
ADA4891-1/ADA4891-2. Typical RF values range from 301 Ω
to 453 Ω for the ADA4891-3/ADA4891-4.
In a controlled impedance signal path, RT is used as the input
termination resistor designed to match the input source imped-
ance. Note that RT is not required for normal operation. RT is
generally set to match the input source impedance.
WIDEBAND, INVERTING GAIN OPERATION
08054-
024
ADA4891
RF
RT
RG
50
SOURCE
RL
+VS
–VS
VI
VO
10F
0.1F
10F
0.1F
Figure 51. Inverting Gain Configuration
Figure 51 shows the inverting gain configuration. For the
inverting gain configuration, set the parallel combination of
RT and RG to match the input source impedance.
Note that a bias current cancellation resistor is not required in
the noninverting input of the amplifier because the input bias
current of the ADA4891 is very low (less than 2 pA). Therefore,
the dc errors caused by the bias current are negligible.
For both noninverting and inverting gain configurations, it is
often useful to increase the RF value to decrease the load on the
output. Increasing the RF value improves harmonic distortion at
the expense of reducing the 0.1 dB bandwidth of the amplifier.
This effect is discussed further in the Effect of RF on 0.1 dB Gain
Flatness section.
RECOMMENDED VALUES
Table 5 and Table 6 provide a quick reference for various configu-
rations and show the effect of gain on the 3 dB small-signal
bandwidth, slew rate, and peaking of the ADA4891-1/ADA4891-2/
ADA4891-3/ADA4891-4. Note that as the gain increases, the
small-signal bandwidth decreases, as is expected from the gain
bandwidth product relationship. In addition, the phase margin
improves with higher gains, and the amplifier becomes more
stable. As a result, the peaking in the frequency response is
reduced (see Figure 7 and Figure 10).
Table 5. Recommended Component Values and Effect of Gain on ADA4891-1/ADA4891-2 Performance (RL = 1 k)
Feedback Network Values
3 dB Small-Signal Bandwidth (MHz)
Slew Rate (V/s)
Peaking (dB)
Gain
RF ()
RG ()
VOUT = 200 mV p-p
tR
tF
1
604
118
188
192
1.3
+1
0
Open
240
154
263
2.6
+2
604
120
170
210
1.4
+5
604
151
32.5
149
154
0
+10
604
67.1
12.7
71
72
0
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