参数资料
| 型号： | LTC6244IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | IC OP AMP DUAL R-R 8-DFN |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 35 V/µs |
| 增益带宽积： | 50MHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 6.25mA |
| 电流 - 输出 / 通道： | 35mA |
| 电压 - 电源，单路/双路(±)： | 2.8 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 带卷 (TR) |
LTC6244
15
6244fb
Amplier Characteristics
Figure 1 is a simplied schematic of the LTC6244, 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 amplier. Capacitor CM sets the overall
amplier 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 amplier 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 RS to avoid phase
inversion.
The input common mode voltage range extends from
V– to V+ – 1.5V. In unity gain voltage follower applications,
exceeding this range by applying a signal that reaches 1V
from the positive supply rail can create a low level instability
at the output. Loading the amplier with several hundred
micro-amps will reduce or eliminate the instability.
ESD
The LTC6244 has reverse-biased ESD protection diodes on
all input and outputs as shown in Figure 1. These diodes
protect the amplier for ESD strikes to 4kV. If these pins
are forced beyond either supply, unlimited current will
ow through these diodes. If the current transient is less
than 1 second and limited to one hundred milliamps or
less, no damage to the device will occur.
The amplier 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 amplier, as
shown in the Typical Performance Chacteristics.
Noise
The LTC6244 exhibits low 1/f noise in the 0.1Hz to 10Hz
region. This 1.5μVP-P noise allows these op amps to be
used in a wide variety of high impedance low frequency
applications, where Zero-Drift ampliers might be inap-
propriate due to their input sampling characteristic.
In the frequency region above 1kHz the LTC6244 also
shows good noise voltage performance. In this frequency
region, noise can easily be dominated by the total source
Figure 1. Simplied Schematic
Figure 2. Unity Gain Follower Test Circuit
APPLICATIONS INFORMATION
R2
6244 F01
VIN
+
ITAIL
VIN
–
VO
V+
V–
CM
DESD5
DIFFERENTIAL
DRIVE
GENERATOR
BIAS
DESD6
V+
DESD2
V+
DESD4
V–
DESD1
V–
DESD3
R1
Q1
M2
M1
M3
M4
C1
Q2
+2.5V
RS
0Ω
–2.5V
6244 F02
+
–
1/2
LTC6244
VIN
VOUT
VOUT AND VIN OF FOLLOWER WITH LARGE INPUT OVERDRIVE
V+
2.5V
V–
–2.5V
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