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| 型号： | LT1006S8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC PREC OP-AMP 5V SINGLE 8-SOIC |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 转换速率： | 1.2 V/µs |
| 电流 - 输入偏压： | 10nA |
| 电压 - 输入偏移： | 80µV |
| 电流 - 电源： | 360µA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 30 V，±2.5 V ~ 15 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
9
LT1006
1006fa
The LT1006 is fully specified for single supply operation,
(i.e., when the negative supply is 0V). Input common
mode range includes ground; the output swings within a
few millivolts of ground. Single supply operation, how-
ever, can create special difficulties, both at the input and
at the output. The LT1006 has specific circuitry which
addresses these problems.
At the input, the driving signal can fall below 0V—
inadvertently or on a transient basis. If the input is more
than a few hundred millivolts below ground, two distinct
problems can occur on previous single supply designs,
such as the LM124, LM158, OP-20, OP-21, OP-220,
OP-221, OP-420:
a) When the input is more than a diode drop below ground,
unlimited current will flow from the substrate (V– termi-
nal) to the input. This can destroy the unit. On the LT1006,
the 400 resistors, in series with the input (see Schematic
Diagram), protect the devices even when the input is 5V
below ground.
b) When the input is more than 400mV below ground
(at 25°C), the input stage saturates (transistors Q3 and
Q4) and phase reversal occurs at the output. This can
cause lock-up in servo systems. Due to a unique phase
reversal protection circuitry (Q21, Q22, Q27, Q28), the
LT1006’s output does not reverse, as illustrated below,
even when the inputs are at –1.5V.
At the output, the aforementioned single supply designs
either cannot swing to within 600mV of ground (OP-20)
or cannot sink more than a few microamperes while
swinging to ground (LM124, LM158). The LT1006’s
all-NPN output stage maintains its low output resistance
and high gain characteristics until the output is saturated.
In dual supply operations, the output stage is crossover
distortion free.
Since the output cannot go exactly to ground, but can only
approach ground to within a few millivolts, care should be
exercised to ensure that the output is not saturated. For
example, a 1mV input signal will cause the amplifier to set
up in its linear region in the gain 100 configuration shown
below, but is not enough to make the amplifier function
properly in the voltage follower mode.
Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V)
Voltage Follower
Gain 100 Amplifier
–
+
99R
600
100mV
5V
LT1006
R
1mV
LT1006 TA02
–
+
600
OUTPUT
SATURATED
≈ 5mV
5V
LT1006
1mV
LT1006 TA03
2V
6VP-P INPUT, –1.5V TO 4.5V
1006 TA11a
4V
0V
2V
LM324, LM358, OP-20, OP-21
1006 TA11b
EXHIBIT OUTPUT PHASE
REVERSAL
4V
0V
2V
LT1006
1006 TA11c
NO PHASE REVERSAL
4V
0V
APPLICATIO S I FOR ATIO
WU
UU
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