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参数资料
| 型号： | TLV2342Y |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | LinCMOSE LOW-VOLTAGE HIGH-SPEED OPERATIONAL AMPLIFIERS |
| 中文描述： | LinCMOSE低压高速运算放大器 |
| 文件页数： | 28/34页 |
| 文件大小： | 519K |
| 代理商： | TLV2342Y |
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–
+
RP
VDD
IF
VO
IL
IP
IP = Pullup Current
Required by the
Operational Amplifier
(typically 500
μ
A)
VO
VDD
RP
IP
IF
IL
RL
VI
R1
R2
Figure 44. Resistive Pullup to Increase V
OH
–
+
VO
CL
Vi
2.5 V
TA = 25
°
C
f = 1 kHz
VI(PP) = 1 V
–2.5 V
Figure 45. Test Circuit for Output Characteristics
TLV2342, TLV2342Y, TLV2344, TLV2344Y
LinCMOS
LOW-VOLTAGE HIGH-SPEED
OPERATIONAL AMPLIFIERS
SLOS194 – FEBRUARY 1997
28
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
latch-up
Because CMOS devices are susceptible to latch-up due to their inherent parasitic thyristors, the TLV234x inputs
and outputs are designed to withstand –100-mA surge currents without sustaining latch-up; however,
techniques should be used to reduce the chance of latch-up whenever possible. Internal protection diodes
should not by design be forward biased. Applied input and output voltage should not exceed the supply voltage
by more than 300 mV. Care should be exercised when using capacitive coupling on pulse generators. Supply
transients should be shunted by the use of decoupling capacitors (0.1
μ
F typical) located across the supply rails
as close to the device as possible.
The current path established if latch-up occurs is usually between the positive supply rail and ground and can
be triggered by surges on the supply lines and/or voltages on either the output or inputs that exceed the supply
voltage. Once latch-up occurs, the current flow is limited only by the impedance of the power supply and the
forward resistance of the parasitic thyristor and usually results in the destruction of the device. The chance of
latch-up occurring increases with increasing temperature and supply voltages.
output characteristics
The output stage of the TLV234x is designed to
sink and source relatively high amounts of current
(see Typical Characteristics). If the output is
subjected to a short-circuit condition, this
high-current capability can cause device damage
under certain conditions. Output current capability
increases with supply voltage.
Although the TLV234x possesses excellent
high-level output voltage and current capability,
methods are available for boosting this capability
if needed. The simplest method involves the use
of a pullup resistor (R
P
) connected from the output
to the positive supply rail (see Figure 44). There
are two disadvantages to the use of this circuit.
First, the NMOS pulldown transistor N4 (see
equivalent schematic) must sink a comparatively
large amount of current. In this circuit, N4 behaves
like a linear resistor with an on resistance between
approximately 60
and 180
, depending on
how hard the operational amplifier input is driven.
With very low values of R
P
, a voltage offset from
0 V at the output occurs. Secondly, pullup resistor
R
P
acts as a drain load to N4 and the gain of the
operational amplifier is reduced at output voltage
levels where N5 is not supplying the output
current.
All operating characteristics of the TLV234x are measured using a 20-pF load. The device drives higher
capacitive loads; however, as output load capacitance increases, the resulting response pole occurs at lower
frequencies thereby causing ringing, peaking, or even oscillation (see Figure 45 and Figure 46). In many cases,
adding some compensation in the form of a series resistor in the feedback loop alleviates the problem.
相关PDF资料 |
PDF描述 |
|---|---|
| TLV2344ID | LinCMOSE LOW-VOLTAGE HIGH-SPEED OPERATIONAL AMPLIFIERS |
| TLV2344Y | LinCMOSE LOW-VOLTAGE HIGH-SPEED OPERATIONAL AMPLIFIERS |
| TLV2361(中文) | Single High-Performance, Low-Voltage OP AMP(高性能，可编程低电压单运放) |
| TLV2362(中文) | Dual High-Performance, Low-Voltage OP AMP(高性能，可编程低电压双运放) |
| TLV2432(中文) | Advanced Lincmos Rail-TO-Rail Output Wide-Input-Voltage Dual OP AMP(宽输入电压，低功耗，中速，高输出驱动双运放) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TLV2344 | 制造商:TI 制造商全称:Texas Instruments 功能描述:LinCMOSE LOW-VOLTAGE HIGH-SPEED OPERATIONAL AMPLIFIERS |
| TLV2344ID | 功能描述:运算放大器 - 运放 Quad LiNCMOS RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLV2344IDG4 | 功能描述:运算放大器 - 运放 Quad LiNCMOS RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLV2344IN | 功能描述:运算放大器 - 运放 Quad LiNCMOS RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| TLV2344INE4 | 功能描述:运算放大器 - 运放 Quad LinCMOS Lo-Vltg High-Speed RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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