参数资料
| 型号： | ISL55020IRZ |
| 厂商： | Intersil |
| 文件页数： | 10/11页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF WIDEBAND 16-QFN |
| 标准包装： | 90 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 差分 |
| 转换速率： | 1200 V/µs |
| -3db带宽： | 300MHz |
| 电流 - 输入偏压： | 25µA |
| 电压 - 输入偏移： | 15000µV |
| 电流 - 电源： | 21mA |
| 电流 - 输出 / 通道： | 150mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 12 V，±2.25 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（4x4） |
| 包装： | 管件 |
8
FN6287.0
December 18, 2006
Description of Operation and Application
Information
Product Description
The ISL55020 is a full differential Current Feedback
Amplifier (CFA) featuring wide bandwidth and low power.
The device contains a pair of high impedance differential
inputs and a pair of differential outputs. It can be used in any
combination of single/differential ended input/output
configurations. A wide bandwidth unity gain, common mode
amplifier with a 100MHz -3dB bandwidth (Figure 6) is
included to provide DC offset correction or common mode
signal injection to the differential output. The ISL55020 is
internally compensated for single-ended closed loop gain
(AVS), differential closed gain (AVD) of 2, or greater.
Connected in differential gain of 5 (single ended gain of ±2.5
and driving a 200
Ω differential load, the ISL55020 has a -
3dB bandwidth of 300MHz. Driving a 200
Ω differential load
at gain of 10, the bandwidth is about 200MHz (Figure 3). The
ISL55020 is available with a power down feature (EN) to
reduce the power while the amplifier is disabled.
Input, Output, and Supply Voltage Range
The ISL55020 is designed to operate with dual supplies over
a range of +/-2.25V to +/-6V and can also operate with a
single supply over the range of 4.5V to 12V. For single
supply operation, the V- and GND pins must be connected
together as close to the device as possible. The amplifiers
have an input common mode voltage range from -4.3V to
3.4V when operated from ±5V supplies. The differential
mode input range (DMIR) between the two inputs is from -
2.3V to +2.3V. The input voltage range at the VCM pin is
from -3.3V to 3.7V. If the input common mode or differential
mode signal is outside the above-specified ranges, the
output signal will be distorted.
The output of the ISL55020 can swing from -3.8V to +3.8V at
100
Ω differential load at ±5V supply. As the load resistance
becomes lower, the output swing is reduced.
Single-ended, Differential and Common Mode Gain
Settings
The ISL55020 can be used as a single/differential ended to
differential/single converter. The voltage applied at VCM pin
sets the output common mode voltage and the common
mode gain is fixed at gain is one (AVCM = 1).
The output differential voltage is given by the following:
Where:
RF1 = RF2 = RF
The differential output gain (AVD) is defined by the feedback
resistors according to the following
The single ended output voltage (VOS) contains a common
mode component (VCM) and a differential mode component
equal to one-half the differential output (VOD/2)., and is
given by the following:
and the single-ended gain becomes:
FIGURE 18. BASIC APPLICATION CIRCUIT
VOUT+
FB+
RG
RF2
IN+
IN-
FB-
VIN+
VIN-
RF1
VOUT -
VCM
RIN-
RIN+
RL+
RL-
+1
OUT+
OUT-
RT-
RT-VCM
RT+
V+
V-
VCM
GND-
EN
V+
V-
GND-
EN
RS+
VOD = (VIN+ - VIN-) x (1 + 2RF/RG)
(EQ. 1)
AVD = 1 + 2RF/RG
(EQ. 2)
VOS = VOD/2 + VCM = VCM +(VIN+ - VIN-) x (0.5 + RF/RG) (EQ. 3)
AVS = 0.5+ RF/RG
(EQ. 4)
ISL55020
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