參數(shù)資料
型號: TLC272MP
廠商: Texas Instruments, Inc.
英文描述: LinCMOSE PRECISION DUAL OPERATIONAL AMPLIFIERS
中文描述: LinCMOSE精密雙運(yùn)算放大器
文件頁數(shù): 31/36頁
文件大?。?/td> 588K
代理商: TLC272MP
TLC272, TLC272A, TLC272B, TLC272Y, TLC277
LinCMOS
PRECISION DUAL OPERATIONAL AMPLIFIERS
SLOS091B – OCTOBER 1987 – REVISED AUGUST 1994
31
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output characteristics (continued)
(c) CL = 150 pF, RL = NO LOAD
(b) CL = 130 pF, RL = NO LOAD
(a) CL = 20 pF, RL = NO LOAD
VI
–2.5 V
CL
VO
2.5 V
+
TA = 25
°
C
f = 1 kHz
VIPP = 1 V
(d) TEST CIRCUIT
Figure 41. Effect of Capacitive Loads and Test Circuit
Although the TLC272 and TLC277 possess excellent high-level output voltage and current capability, methods
for boosting this capability are available, 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 42). 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. Second, 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.
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