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參數(shù)資料
| 型號： | LTC2055 |
| 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運算放大器 |
| 文件頁數(shù)： | 16/24頁 |
| 文件大?。?/td> | 490K |
| 代理商： | LTC2055 |
LTC6241/LTC6242
16
62412f
APPLICATIU
phase lead to compensate the phase lag of the second
amplifier. The op amp’s good input offset voltage match
and low input bias current means that the typical differential
output voltage is less than 40μV. A noise spectrum plot of
the differential output is shown in Figure 5.
W
U
U
gain of the difference amplifier is one. An LTC6910-2 PGA
amplifies the difference amplifier output with inverting
gains of –1, –2, –4, –8, –16, –32 and –64. The second
LTC6241 op amp is used as an integrator to set the DC
output voltage equal to the LT6650 reference voltage V
REF
.
The integrator drives the PGA analog ground to provide
a feedback loop, in addition to blocking any DC voltage
through the PGA. The reference voltage of the LT6650
can be set to a voltage from 400mV to V
+
– 350mV with
resistors R5 and R6. If R6 is 20k or less, the error due
to the LT6650 op amp bias current is negligible. The low
voltage offset and drift of the LTC6241 integrator will not
contribute any significant error to the LT6650 reference
voltage. The LT6650 V
REF
voltage has a maximum error
Figure 5. Differential Output Noise
FREQUENCY (kHz)
0
20
60
10
40
80
30
70
50
90 100
D
√
H
140
60
80
100
120
0
20
40
6241 F05
V
S
=
±
2.5V
T
= 25
°
C
–3dB BW = 80kHz
Achieving Low Input Bias Current
The DD package is leadless and makes contact to the PCB
beneath the package. Solder flux used during the attach-
ment of the part to the PCB can create leakage current
paths and can degrade the input bias current performance
of the part. All inputs are susceptible because the backside
paddle is connected to V
–
internally. As the input voltage
changes or if V
–
changes, a leakage path can be formed
and alter the observed input bias current. For lowest bias
current, use the LTC6241 in the SO-8 and provide a guard
ring around the inputs that are tied to a potential near the
input voltage.
A Digitally Programmable AC Difference Amplifier
The LTC6241 configured as a difference amplifier, can
be combined with a programmable gain amplifier (PGA)
to obtain a low noise high speed programmable differ-
ence amplifier. Figure 6 shows the LTC6241 based as a
single-supply AC amplifier. One LTC6241 op amp is used
at the circuit’s input as a standard four resistor difference
amplifier. The low bias current and current noise of the
LTC6241 allow the use of high valued input resistors, 100k
or greater. Resistors R1, R2, R3 and R4 are equal and the
Figure 6. Wideband Difference Amplifier with High
Input Impedance and Digitally Programmable Gain
6241 F06
R4
R3
R2
–
+
1/2
LTC6241
C1
C2
1
μ
F
0.1
μ
F
8
7
6
5
G2
G1
G0
1
1
2
2
3
4
AGND
OUT
IN
V
–
V
+
0.1
μ
F
V
+
V
+
R1
R1 = R2 = R3 = R4
V2
V1
R5
1k
1000pF
3
4
5
R6
20k
LTC6910-2
LT6650
V
OUT
V
REF
–
+
1/2
LTC6241
C3
R7
100
1
μ
F
DIGITAL INPUTS
G1
G2
0
0
1
1
0
0
1
1
1
GO
0
1
0
1
0
1
0
1
GAIN
0
0
0
0
1
1
1
0
–1
–2
–4
–8
–16
–32
–64
V
OUT
= (V1 – V2) GAIN + V
REF
R
R
R
k
V
REF
=
5 10
5
d BANDWIDTH
–
3
1
2
3
π
(
)
GAIN
R
π
V
REF
=
+
–
(
)
=
f
0 4
.
5
6
1
2
f
R6 20
–
k
f
R
C
HIGH
LOW
HIGH
=
=
1
2
7
3
f
C
LOW
=
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