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參數(shù)資料
| 型號： | LTC6248IMS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP RRIO 180MHZ QUAD 16MSOP |
| 標準包裝： | 2,500 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 4 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 90 V/µs |
| 增益帶寬積： | 180MHz |
| -3db帶寬： | 120MHz |
| 電流 - 輸入偏壓： | 400nA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 1.25mA |
| 電流 - 輸出 / 通道： | 100mA |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 5.25 V，±1.25 V ~ 2.625 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-TFSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-MSOP |
| 包裝： | 帶卷 (TR) |
LTC6246/LTC6247/LTC6248
624678fa
applicaTions inForMaTion
Input Offset Voltage
The offset voltage will change depending upon which
input stage is active. The PNP input stage is active from
the negative supply rail to approximately 1.2V below the
positive supply rail, then the NPN input stage is activated
for the remaining input range up to the positive supply rail
with the PNP stage inactive. The offset voltage magnitude
for the PNP input stage is trimmed to less than 500V with
5V total supply at room temperature, and is typically less
than 150μV. The offset voltage for the NPN input stage
is typically less than 1.7mV with 5V total supply at room
temperature.
Input Bias Current
The LTC6246 family uses a bias current cancellation cir-
cuit to compensate for the base current of the PNP input
pair. When the input common mode voltage is less than
200mV, the bias cancellation circuit is no longer effective
and the input bias current magnitude can reach a value
above 1A. For common mode voltages ranging from
0.2V above the negative supply to 1.2V below the positive
supply, the low input bias current of the LTC6246 family
allows the amplifiers to be used in applications with high
source resistances where errors due to voltage drops
must be minimized.
Output
The LTC6246 family has excellent output drive capability.
The amplifiers can typically deliver over 50mA of output
drive current at a total supply of 5V. The maximum out-
put current is a function of the total supply voltage. As
the supply voltage to the amplifier decreases, the output
current capability also decreases. Attention must be paid
to keep the junction temperature of the IC below 150°C
(refer to the Power Dissipation Section) when the output
is in continuous short circuit. The output of the amplifier
has reverse-biased diodes connected to each supply. If
the output is forced beyond either supply, extremely high
current will flow through these diodes which can result
in damage to the device. Forcing the output to even 1V
beyond either supply could result in several hundred mil-
liamps of current through either diode.
Input Protection
The input stages are protected against a large differential
input voltage of 1.4V or higher by 2 pairs of back-to-back
diodes to prevent the emitter-base breakdown of the input
transistors. In addition, the input and shutdown pins have
reverse biased diodes connected to the supplies. The cur-
rent in these diodes must be limited to less than 10mA.
The amplifiers should not be used as comparators or in
other open loop applications.
ESD
The LTC6246 family has reverse-biased ESD protection
diodes on all inputs and outputs as shown in Figure 1.
Thereisanadditionalclampbetweenthepositiveandnega-
tive supplies that further protects the device during ESD
strikes. Hot plugging of the device into a powered socket
must be avoided since this can trigger the clamp resulting
in larger currents flowing between the supply pins.
Capacitive Loads
The LTC6246/LTC6247/LTC6248 are optimized for high
bandwidthandlowpowerapplications.Consequentlythey
have not been designed to directly drive large capacitive
loads. Increased capacitance at the output creates an ad-
ditional pole in the open loop frequency response, wors-
ening the phase margin. When driving capacitive loads, a
resistor of 10Ω to 100Ω should be connected between the
amplifier output and the capacitive load to avoid ringing
or oscillation. The feedback should be taken directly from
the amplifier output. Higher voltage gain configurations
tend to have better capacitive drive capability than lower
gain configurations due to lower closed loop bandwidth
and hence higher phase margin. The graphs titled Series
Output Resistor vs Capacitive Load demonstrate the tran-
sient response of the amplifier when driving capacitive
loads with various series resistors.
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