參數(shù)資料
型號: LTC6247IMS8#TRPBF
廠商: Linear Technology
文件頁數(shù): 5/24頁
文件大小: 0K
描述: IC OPAMP DUAL 180MHZ 8MSOP
標準包裝: 2,500
放大器類型: 通用
電路數(shù): 2
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 90 V/µs
增益帶寬積: 180MHz
-3db帶寬: 120MHz
電流 - 輸入偏壓: 400nA
電壓 - 輸入偏移: 100µV
電流 - 電源: 1.25mA
電流 - 輸出 / 通道: 100mA
電壓 - 電源,單路/雙路(±): 2.5 V ~ 5.25 V,±1.25 V ~ 2.625 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 帶卷 (TR)
LTC6246/LTC6247/LTC6248
624678fa
applicaTions inForMaTion
Circuit Description
The LTC6246/LTC6247/LTC6248 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. LTC6246/LTC6247/LTC6248 Simplified Schematic Diagram
–IN: Inverting Input of Amplifier. Valid input range from V
to V+.
+IN: Non-Inverting Input of Amplifier. Valid input range
from Vto V+.
V+ : Positive Supply Voltage. Allowed applied voltage
ranges from 2.5V to 5.25V when V= 0V.
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 50mA of current at a total supply of 5V.
pin FuncTions
624678 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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