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参数资料
| 型号： | LT1800 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | 80MHz, 25V/ms Low Power Rail-to-Rail Input and Output Precision Op Amp |
| 中文描述： | 为80MHz，25V/ms低功耗轨至轨输入和输出精密运算放大器 |
| 文件页数： | 12/16页 |
| 文件大小： | 266K |
| 代理商： | LT1800 |
12
LT1800
1800f
APPLICATIOU
of Q16 is nominally equal to the base current of the input
devices. The base current of Q16 is then mirrored by
devices Q17-Q19 to cancel the base current of the input
devices Q1-Q2.
A pair of complementary common emitter stages Q14/Q15
that enable the output to swing from rail to rail constructs
the output stage. The capacitors C2 and C3 form the local
feedback loops that lower the output impedance at high
frequency. These devices are fabricated on Linear
Technology’s proprietary high-speed complementary bi-
polar process.
W
U
U
Power Dissipation
The LT1800 amplifier is offered in a small package, SOT-23,
which has a thermal resistance of 250
°
C/W,
θ
JA
. So there
is a need to ensure that the die’s junction temperature
should not exceed 150
°
C. Junction temperature T
J
is
calculated from the ambient temperature T
A
, power dissi-
pation P
D
and thermal resistance
θ
JA
:
T
J
= T
A
+ (P
D
θ
JA
)
The power dissipation in the IC is the function of the supply
voltage, output voltage and the load resistance. For a given
supply voltage, the worst-case power dissipation P
DMAX
occurs at the maximum supply current and the output
voltage is at half of either supply voltage (or the maximum
swing is less than 1/2 supply voltage). P
DMAX
is given by:
P
DMAX
= (V
S
I
SMAX
) + (V
S
/2)
2
/R
L
Example: An LT1800 in a SOT-23 package operating on
±
5V supplies and driving a 50
load, the worst-case
power dissipation is given by:
P
DMAX
= (10 4mA) + (2.5)
2
/50 = 0.04 + 0.125 = 0.165W
The maximum ambient temperature that the part is al-
lowed to operate is:
T
A
= T
J
– (P
DMAX
250
°
C/W)
= 150
°
C – (0.165W 250
°
C/W) = 108
°
C
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 1.2V of the positive supply rail, then
the NPN input stage is activated for the remaining input
range up to the positive supply rail during which the PNP
stage remains inactive. The offset voltage is typically less
than 75
μ
V in the range that the PNP input stage is active.
Input Bias Current
The LT1800 employs a patent-pending technique to trim
the input bias current to less than 250nA for the input
common mode voltage of 0.2V above negative supply rail
to 1.2V of the positive rail. The low input offset voltage
and low input bias current of the LT1800 provide the
precision performance especially for high source imped-
ance applications.
Output
The LT1800 can deliver a large output current, so the
short-circuit current limit is set around 50mA to prevent
damage to the device. Attention must be paid to keep the
junction temperature of the IC below the absolute maxi-
mum rating of 150
°
C (refer to the Power Dissipation
section) when the output is continuously short circuited.
The output of the amplifier has reverse-biased diodes
connected to each supply. If the output is forced beyond
either supply, unlimited current will flow through these
diodes. If the current is transient and limited to several
hundred mA, and the total supply voltage is less than
12.6V, the absolute maximum rating, no damage will
occur to the device.
Overdrive Protection
When the input voltage exceeds the power supplies, two
pairs of crossing diodes D1 to D4 will prevent the output
from reversing polarity. If the input voltage exceeds either
power supply by 700mV, diode D1/D2 or D3/D4 will turn
on to keep the output at the proper polarity. For the phase
reversal protection to perform properly, the input current
must be limited to less than 10mA. If the amplifier is
severely overdriven, an external resistor should be used to
limit the overdrive current.
The LT1800’s input stages are also protected against a
large differential input voltage of 1.4V or higher by a pair
of back-back diodes D5/D8 to prevent the emitter-base
breakdown of the input transistors. The current in these
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相关代理商/技术参数 |
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|---|---|
| LT1800CS5 | 制造商:Linear Technology 功能描述:OP Amp Single GP R-R I/O 制造商:Linear Technology 功能描述:OP Amp Single GP R-R I/O ±6.3V/12.6V 5-Pin TSOT-23 |
| LT1800CS5#PBF | 制造商:Linear Technology 功能描述:OP-AMP PRECISION 80MHZ 25V/ 制造商:Linear Technology 功能描述:OP-AMP, PRECISION, 80MHZ, 25V/us, TSOT-23-5; Op Amp Type:Precision; No. of Amplifiers:1; Slew Rate:25V/s; Supply Voltage Range:2.3V to 12.6V; Amplifier Case Style:TSOT-23; No. of Pins:5; Bandwidth:80MHz; Package / Case:5-TSOT-23 ;RoHS Compliant: Yes |
| LT1800CS5#TR | 功能描述:IC OPAMP R-RIN/OUT LP TSOT-23-5 RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| LT1800CS5#TRM | 功能描述:IC OPAMP R-RIN/OUT LP TSOT23-5 RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| LT1800CS5#TRMPBF | 功能描述:IC OPAMP R-RIN/OUT LP TSOT-23-5 RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 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，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
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