value, the specied f3dB
參數(shù)資料
型號(hào): LT1994CDD#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 10/20頁(yè)
文件大小: 0K
描述: IC DIFF AMP/DRIVER LN 8-DFN
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 差分
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 65 V/µs
增益帶寬積: 70MHz
電流 - 輸入偏壓: 18µA
電壓 - 輸入偏移: 3000µV
電流 - 電源: 14.8mA
電流 - 輸出 / 通道: 85mA
電壓 - 電源,單路/雙路(±): 2.375 V ~ 12.6 V,±1.188 V ~ 6.3 V
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 8-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 8-DFN-EP(3x3)
包裝: 帶卷 (TR)
LT1994
18
1994fb
3. Calculate R3, R2 and R1 using the standard 5% C2
value, the specied f3dB and the specied passband
gain (Gn)
f
MHz and Gain
or Gain
MHz
f
dB
3
18 8
1
≤≤
.
R1, R2 and R3 equations (C2 in pF and f3dB in kHz)
R
Gn
C
f
3
1 121
1 131 0 127
10
12
8
3
=
()
+
()
.–
.– .
ddB
dB
Note
R
RC
f
R
Gn
()
.
1
2
1 266 10
32
1
2
15
2
3
2
=
Example: The specied –3dB frequency is 1MHz Gain = 1
1. Using f3dB = 1000kHz, C2abs = 400pF
2. Nearest standard 5% value to 400pF is 390pF and C21
= C22 = 390pF and C11 = 3900pF
3. Using f3dB = 1000kHz, C2 = 390pF and Gain = 1, R1
= 549
Ω, R2 = 549Ω and R3 = 15.4Ω (nearest 1%
values). R11 = R21 = 549
Ω, R21 = R22 = 549Ω and
R31 = R32 = 15.4
Ω.
Note 1: The equations for R1, R2, R3 are ideal and do
not account for the nite gain bandwidth product (GBW)
of the LT1994 (70MHz). The maximum gain is set by
the C1/C2 ratio (which for convenience is set equal to
ten).
Note 2: The calculated value of a capacitor is chosen
to produce input resistors less than 600
Ω. If a higher
value input resistance is required then multiply all resis-
tor values and divide all capacitor values by the same
number.
A Single-Ended to Differential Voltage Conversion with Source Impedance Matching and Level Shifting
1994 TA05
+
+
V+
V
t
0.1μF
3
7
6
8
1
2
5
4
RS
50Ω
374Ω
50Ω
54.9Ω
402Ω
0.1μF
VIN
LT1994
VOCM
VOUT
+
VOUT
VOCM – 0.25V
VOCM + 0.25V
VOUT
VOUT
+
VOCM
0
1
–1
V
t
0
TYPICAL APPLICATIONS
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