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參數(shù)資料
| 型號： | LTC6242 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual/Quad 18MHz, Low Noise, Rail-to-Rail, CMOS Op Amps |
| 中文描述： | 雙/四路18MHz的，低噪聲，軌到軌CMOS運(yùn)算放大器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 490K |
| 代理商： | LTC6242 |
LTC6241/LTC6242
14
62412f
APPLICATIU
Amplifier Characteristics
Figure 1 is a simplified schematic of the LTC6241, which
has a pair of low noise input transistors M1 and M2. A
simple folded cascode Q1, Q2 and R1, R2 allow the input
stage to swing to the negative rail, while performing level
shift to the Differential Drive Generator. Low offset voltage
is accomplished by laser trimming the input stage.
Capacitor C1 reduces the unity cross frequency and im-
proves the frequency stability without degrading the gain
bandwidth of the amplifier. Capacitor Cm sets the overall
amplifier gain bandwidth. The differential drive generator
supplies signals to transistors M3 and M4 that swing the
output from rail-to-rail.
The photo of Figure 2 shows the output response to an
input overdrive with the amplifier connected as a voltage
follower. If the negative going input signal is less than
a diode drop below V
–
, no phase inversion occurs. For
input signals greater than a diode drop below V
–
, limit the
current to 3mA with a series resistor R
S
to avoid phase
inversion.
W
U
U
ESD
The LTC6241 has reverse-biased ESD protection diodes
on all input and outputs as shown in Figure 1. If these
pins are forced beyond either supply, unlimited current
will flow through these diodes. If the current is transient
and limited to one hundred milliamps or less, no damage
to the device will occur.
The amplifier input bias current is the leakage current of
these ESD diodes. This leakage is a function of the tem-
perature and common mode voltage of the amplifier, as
shown in the Typical Performance Curves.
Noise
The LTC6241 exhibits exceptionally low 1/f noise in the
0.1Hz to 10Hz region. This 550nV
P-P
noise allows these
op amps to be used in a wide variety of high impedance
low frequency applications, where Zero-Drift amplifiers
might be inappropriate due to their charge injection.
In the frequency region above 1kHz the LTC6241 also
show good noise voltage performance. In this frequency
region, noise can easily be dominated by the total source
resistance of the particular application. Specifically, these
amplifiers exhibit the noise of a 3.1k
Ω
resistor, meaning it
is desirable to keep the source and feedback resistance at
or below this value, i.e. R
S
+ R
G
||R
FB
≤ 3.1k
Ω
. Above this
total source impedance, the noise voltage is not dominated
by the amplifier.
Noise current can be estimated from the expression i
n
=
√2qI
B
, where q = 1.6 10
–19
coulombs. Equating √4kTR
Δ
f
and R√2qI
B
Δ
f shows that for source resistors below 50G
Ω
the amplifier noise is dominated by the source resistance.
See the Typical Characteristics curve Noise Current vs
Frequency.
Figure 1. Simplified Schematic
Figure 2. Unity Gain Follower Test Circuit
R2
Q2
6241 F01
V
IN+
I
TAIL
V
IN–
V
O
V
+
V
+
V
–
V
–
V
–
CM
DESD5
DIFFERENTIAL
DRIVE
GENERATOR
BIAS
DESD6
V
+
DESD2
V
+
DESD4
V
–
DESD1
V
–
DESD3
R1
Q1
M2
M1
M3
M4
C1
+2.5V
–2.5V
6241 F02
–
+
1/2
LTC6241
R
S
V
IN
V
OUT
V
OUT
AND V
IN
OF FOLLOWER WITH LARGE INPUT OVERDRIVE
V
=
+2.5V
V
=
–2.5V
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