参数资料
型号: LTC6254IMS#PBF
厂商: Linear Technology
文件页数: 5/26页
文件大小: 0K
描述: IC OPAMP R-R 720MHZ MSOP-16
标准包装: 37
放大器类型: 通用
电路数: 4
输出类型: 满摆幅
转换速率: 280 V/µs
增益带宽积: 720MHz
-3db带宽: 400MHz
电流 - 输入偏压: 1.4µA
电压 - 输入偏移: 100µV
电流 - 电源: 4.25mA
电流 - 输出 / 通道: 100mA
电压 - 电源,单路/双路(±): 2.5 V ~ 5.25 V,±1.25 V ~ 2.625 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TFSOP(0.118",3.00mm 宽)
供应商设备封装: 16-MSOP
包装: 管件
LTC6252/LTC6253/LTC6254
13
625234fc
APPLICATIONS INFORMATION
Circuit Description
The LTC6252/LTC6253/LTC6254 have an input and output
signal range that extends from the negative power supply
to the positive power supply. Figure 1 depicts a simplified
schematic of the amplifier. The input stage is comprised
of two differential amplifiers, a PNP stage, Q1/Q2, and an
NPN stage, Q3/Q4 that are active over different common
mode input voltages. The PNP stage is active between
the negative supply to nominally 1.2V below the positive
supply. As the input voltage approaches the positive sup-
ply, the transistor Q5 will steer the tail current, I1, to the
current mirror, Q6/Q7, activating the NPN differential pair
and the PNP pair becomes inactive for the remaining input
commonmoderange.Also,attheinputstage,devicesQ17
to Q19 act to cancel the bias current of the PNP input pair.
When Q1/Q2 are active, the current in Q16 is controlled to
be the same as the current in Q1 and Q2. Thus, the base
current of Q16 is nominally equal to the base current of
the input devices. The base current of Q16 is then mirrored
by devices Q17 to Q19 to cancel the base current of the
input devices Q1/Q2. A pair of complementary common
emitter stages, Q14/Q15, enable the output to swing from
rail-to-rail.
Figure 1. LTC6252/LTC6253/LTC6254 Simplified Schematic Diagram
–IN: Inverting Input of Amplifier. Input range from V
to V+.
+IN: Non-Inverting Input of Amplifier. Input range from
Vto V+.
V+ : Positive Supply Voltage. Total supply voltage ranges
from 2.5V to 5.25V.
V:NegativeSupplyVoltage.Typically0V.Thiscanbemade
a negative voltage as long as 2.5V ≤ (V+ – V) ≤ 5.25V.
SHDN: Active Low Shutdown. Threshold is typically 1.1V
referenced to V. Floating this pin will turn the part on.
OUT: Amplifier Output. Swings rail-to-rail and can typically
source/sink over 90mA of current at a total supply of 5V.
PIN FUNCTIONS
625234 F01
Q15
ESDD5
Q14
C2
C1
BUFFER
AND
OUTPUT BIAS
R5
R4
Q13
Q12
I3
V
+
CC
Q8
R3
Q11
Q9
Q10
R2
R1
Q2
Q1
Q3
Q4
I1
+
I2
+
VBIAS
Q5
Q6
Q19
Q7
D8
D7
Q18
Q17
D6
D5
ESDD2
V
ESDD1
V+
ESDD4
V
ESDD3
V+
Q16
V
V+
+IN
–IN
ESDD6
OUT
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