參數(shù)資料
型號(hào)： LT1008IN8#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 16/16頁(yè)
文件大小： 0K
描述： IC PREC OP-AMP UNIVRSL SNGL 8DIP
標(biāo)準(zhǔn)包裝： 50
放大器類型： 通用
電路數(shù)： 1
轉(zhuǎn)換速率： 0.2 V/µs
電流 - 輸入偏壓： 30pA
電壓 - 輸入偏移： 30µV
電流 - 電源： 380µA
電壓 - 電源，單路/雙路(±)： ±2 V ~ 18 V
工作溫度： -40°C ~ 85°C
安裝類型： 通孔
封裝/外殼： 8-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 8-PDIP
包裝： 管件
9
LT1008
1008fb
APPLICATIO S I FOR ATIO
WU
UU
Frequency Compensation
The LT1008 is externally frequency compensated with a
single capacitor. The two standard compensation circuits
shown earlier are identical to the LM108A/LM308A fre-
quency compensation schemes. Therefore, the LT1008
operational amplifiers can be inserted directly into
LM108A/LM308A sockets, with similar AC and upgraded
DC performance.
External frequency compensation provides the user with
additional flexibility in shaping the frequency response of
the amplifier. For example, for a voltage gain of ten and
CF = 3pF, a gain bandwidth product of 5MHz and slew rate
of 1.2V/
μs can be realized. For closed-loop gains in excess
of 200, no external compensation is necessary, and slew
rate increases to 4V/
μs. The LT1008 can also be overcom-
pensated (i.e., CF > 30pF or CS > 100pF) to improve capaci-
tive load handling capability or to narrow noise bandwidth.
In many applications, the feedback loop around the ampli-
fier has gain (e.g., logarithmic amplifiers); overcompen-
sation can stabilize these circuits with a single capacitor.
The availability of the compensation terminals permits the
use of feedforward frequency compensation to enhance
slew rate in low closed-loop gain configurations. The
inverter slew rate is increased to 1.4V/
μs. The voltage
follower feedforward scheme bypasses the amplifier’s
gain stages and slews at nearly 10V/
μs.
The inputs of the LT1008 are protected with back-to-back
diodes. Current limiting resistors are not used, because the
leakage of these resistors would prevent the realization of
picoampere level bias currents at elevated temperatures.
In the voltage follower configuration, when the input is
driven by a fast, large-signal pulse (>1V), the input protec-
tion diodes effectively short the output to the input during
slewing, and a current, limited only by the output short-
circuit protection, will flow through the diodes.
The use of a feedback resistor, as shown in the voltage
follower feedforward diagram, is recommended because
this resistor keeps the current below the short-circuit
limit, resulting in faster recovery and settling of the output.
–
+
–
+
LT1008*
LT1001
10
Ω
100k
2k
100k
110k
SCOPE
×1
RIN = 1M
4.3k
24.3k
0.1
μF
1008 AI03
0.1
μF
*DEVICE UNDER TEST
NOTE: ALL CAPACITOR VALUES ARE FOR
NONPOLARIZED CAPACITORS ONLY
4.7
μF
VOLTAGE
GAIN: 50,000
2.2
μF
22
μF
–
+
C1
500pF
C3
10pF
R1
10k
R2
10k
C2
5pF
R3
3k
1
8
1008 AI05
6
VOUT
LT1008
2
INPUT
3
Inverter Feedforward Compensation
0.1Hz to 10Hz Noise Test Circuit
2V/DIV
5
μs/DIV
1008 AI07
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