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參數資料
| 型號： | 5962-9097701HXX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | OP-AMP, 8000 uV OFFSET-MAX, MBCY12 |
| 封裝： | METAL CAN, TO-8, 12 PIN |
| 文件頁數： | 5/7頁 |
| 文件大?。?/td> | 157K |
| 代理商： | 5962-9097701HXX |
KH207
DATA SHEET
REV. 1A February 2001
5
Figure 4: Active Current Limit Circuit (50mA)
Controlling Bandwidth and Passband Response
In most applications, a feedback resistor value of 2k
will provide optimum performance; nonetheless, some
applications may require a resistor of some other value.
The response versus Rf plot on the previous page shows
how decreasing Rf will increase bandwidth (and frequency
response peaking, which may lead to instability).
Conversely, large values of feedback resistance tend to
roll off the response.
The best settling time performance requires the use of an
external feedback resistor (use of the internal resistor
results in a 0.1% to 0.2% settling tail). The settling
performance may be improved slightly by adding a
capacitance of 0.4pF in parallel with the feedback
resistor (settling time specifications reflect performance
with an external feedback resistor but with no external
capacitance).
Thermal Model
Noise Analysis
Approximate noise figure can be determined for the
KH207 using the Equivalent Input Noise plot on page 3
and the equations shown below.
kT = 4.00 x 10-21 Joules at 290°K
Vn is spot noise voltage (V/√Hz)
in is non-inverting spot noise current (A/√Hz)
ii is inverting spot noise current (A/√Hz)
Figure 5: Noise Figure Diagram and Equations
(Noise Figure is for the Network Inside this Box.)
Driving Cables and Capacitive Loads
When driving cables, double termination is used to
prevent reflections. For capacitive load applications, a
small series resistor at the output of the KH207 will
improve stability and settling performance.
Transmission Line Matching
One method for matching the characteristic impedance
(Zo) of a transmission line or cable is to place the
appropriate resistor at the input or output of the amplifier.
Figure 6 shows typical inverting and non-inverting circuit
configurations for matching transmission lines.
Figure 6: Transmission Line Matching
Non-inverting gain applications:
s
Connect Rg directly to ground.
s
Make R1, R2, R6, and R7 equal to Zo.
s
Use R3 to isolate the amplifier from reactive
loading caused by the transmission line,
or by parasitics.
Rs
Rn
Ro
Rf
Rg
KH207
+
-
F
R
kT
i
V
R
Ri
RA
where R
RR
A
R
s
n
s
n
p
f
i
pv
p
sn
v
f
g
=+
+
+
=
+
=+
10
1
4
1
2
22
log
;
Q3
(2N3906)
Rx
14.3k
Q4
(2N3904)
0.01
F
0.01
F
+Vcc
Rc
12
Q1
(MJE170)
Q2
(MJE180)
Rc
12
-Vcc
to pin 10
to pin 12
Pcircuit = [(+VCC) – (-VCC)]
2 / 1.77k
Pxxx = [(±VCC) – Vout – (Icol) (Rcol + 6)] (Icol)
(% duty cycle)
(For positive Vo and VCC, this is the power in the npn output stage.)
(For negative Vo and VCC, this is the power in the pnp output stage.)
θ
ca =
65°C/W in still air without a heatsink.
35°C/W in still air without a Thermalloy 2268.
15°C/W in 300ft/min air with a Thermalloy 2268
(Thermalloy 2240 works equally well.)
Icol = Vout/Rload or 3mA, whichever is greater.
(Include feedback R in Rload.)
Rcol is a resistor (33 recommended) between the xxx collector and ±VCC.
Tj (pnp) = Ppnp (100 + θca) + (Pcir + Pnpn)θca + Ta, similar for Tj (npn).
Tj (cir) = Pcir (17.5 + θca) + (Ppnp + Pnpn)θca + Ta.
+
-
Tambient
θca
Tcase
17.5
°C/W
Tj(circuit)
Pcircuit
100
°C/W
Tj(npn)
Pnpn
100
°C/W
Ppnp
Tj(pnp)
KH207
+
-
R3
Z0
R6
Vo
Z0
R1
R2
+
-
Rg
Z0
R4
R5
V1
V2 +-
Rf
C6
R7
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