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參數(shù)資料
| 型號： | ISL55211IRTZ-T7A |
| 廠商： | Intersil |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP DIFF LOW NOISE 16TQFN |
| 產(chǎn)品培訓模塊： | Solutions for Test and Measurement Equipment |
| 標準包裝： | 1 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 5600 V/µs |
| -3db帶寬： | 1.6GHz |
| 電流 - 輸入偏壓： | 50µA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 35mA |
| 電流 - 輸出 / 通道： | 45mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 4.2 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 16-TQFN（3x3） |
| 包裝： | 標準包裝 |
| 其它名稱： | ISL55211IRTZ-T7ADKR |
ISL55211
10
FN7868.0
June 21, 2011
Applications
Basic Operation
The ISL55211 is a very wideband, voltage feedback based,
differential amplifier including an output common mode control
loop and optional power shutdown feature. Intended for very low
distortion differential signal driving, this internally fixed gain
device provides 3 possible gain settings by simply picking the
input side connections as shown in Table 1. Including internal
compensation, the ISL55211 holds a constant bandwidth over
gain settings. Most applications are intended for AC-coupled I/O
using a single 3.3V supply and an input transformer. The internal
resistor values have been scaled up slightly to require an external
termination element along with the two internal resistors where
a 50 differential input match is desired. This does increase the
output noise slightly but narrows up the input VSWR tolerance
and lowers the added loading of the feedback resistors
improving SFDR.
Where DC-coupled differential I/O operation is desired, the
ISL55211 can be connected directly to the source as long as the
internal input common mode range limits are observed (1.1V to
1.7V for a 3.3V single supply operation). For a DC-coupled, single
to differential requirement, consider the ISL55210. This device is
an external resistor version of the ISL55211 where the flexibility
in the external resistors will enable single to differential
operation. For a ground referenced input signal, this will require a
negative supply when using the ISL55210.
Most applications behave as a differential inverting op amp
design. There is therefore an input gain resistor on each side of
the inputs that must be driven. The 3 possible connections to the
two pairs of input pins will give a 100, 125, or 250 input
resistor on each side. Combined with the two input turns ratio's
shown in Table 1, gives a 9dB to 20dB operating gain range in
approximately 3dB steps.
The device can be powered down to < 400A supply current
using the optional disable pin. To operate normally, this pin
should be asserted high using a simple logic gate to +VCC or tied
high through a 10k resistor to +VCC. When disabled, the power
dissipation drops to < 1mW but, due to the inverting op amp type
architecture, the input signal will feed-forward through the
feedback and gain resistors giving limited isolation.
Application and Characterization Circuits
Test Circuit 1 of Figure 29 forms a starting point for many of the
characterization curves for the ISL55211. Since most lab sources
and measurement devices are single-ended, this circuit converts
to differential at the input through a wideband transformer and
would also be a typical application circuit coming from a
single-ended source. Assuming the source is a 50 impedance,
the internal RG resistors and external RT are set to provide both
the input termination and the gain. Since the inverting summing
nodes act as virtual ground points for AC signal analysis, the total
termination impedance across the input transformer secondary
will be (2*RG)||RT. Setting this equal to n2*RS will give a
matched input impedance inside the bandwidth of the
transformer (where "n" is the turns ratio). The amplifier gain is
fixed by the selected input RG element and the internal 500
feedback resistors. While the ISL55211 is internally a Voltage
Feedback Design (VFA) to give the lowest possible noise, internal
compensation caps hold the bandwidth over gain setting
approximately constant at 1.4GHz. For wider small signal
bandwidth at lower gains, consider the ISL55210, which provides
>2.2GHz at a gain of 12dB.
FIGURE 27. DEFAULT VCM AND MAX VOPP vs SUPPLY VOLTAGE
FIGURE 28. SUPPLY CURRENT vs SUPPLY VOLTAGE
Typical Performance Curves V
s+ = 3.3V, TA ≈ +25°C, unless otherwise noted. (Continued)
1
2
3
4
5
6
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5
SUPPLY VOLTAGE (V)
INTERNALLY SET VCM
MAXIMUM DIFFERENTIAL VP-P
OUTPUT USING DEFAULT VCM
OUTPUT
DEFAULT
V
CM
AND
MAX
DIFFERENTIAL
V
OP
P
(V)
TEST CIRCUIT 1
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5
SINGLE SUPPLY VOLTAGE (V)
TA = +25°C
TA = -40°C
TA = +85°C
SUPPLY
C
URREN
T
(m
A)
TEST CIRCUIT 1
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