參數(shù)資料
型號: LT1794CSW#PBF
廠商: Linear Technology
文件頁數(shù): 19/20頁
文件大?。?/td> 0K
描述: IC OPAMP 200MHZ DUAL 20-SOIC
標(biāo)準(zhǔn)包裝: 38
類型: 線路驅(qū)動器,發(fā)射器
驅(qū)動器/接收器數(shù): 2/0
規(guī)程: xDSL
電源電壓: 18V
安裝類型: 表面貼裝
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 20-SOIC
包裝: 管件
8
LT1794
outputs are in a high impedance state. Part to part varia-
tions however, will cause inconsistent control of the qui-
escent current if direct voltage drive of the SHDN pin is used.
Using a single external resistor, RBIAS, connected in one of
two ways provides a much more predictable control of the
quiescent supply current. Figure 2 illustrates the effect on
supply current per amplifier with RBIAS connected be-
tween the SHDN pin and the 12V V+ supply of the LT1794
and the approximate design equations. Figure 3 illustrates
the same control with RBIAS connected between the
SHDNREF pin and ground while the SHDN pin is tied to V+.
Either approach is equally effective.
APPLICATIO S I FOR ATIO
WU
UU
Figure 1. Internal Current Biasing Circuitry
2k
SHDN
SHDNREF
TO
START-UP
CIRCUITRY
1k
1794 F01
IBIAS
TO AMPLIFIERS
BIAS CIRCUITRY
2I
I
2I
5I
2
5
IBIAS =
ISUPPLY PER AMPLIFIER (mA) = 64 IBIAS
ISHDN = ISHDNREF
RBIAS (k)
0
I SUPPLY
PER
AMPLIFIER
(mA)
10
20
30
5
15
25
10
1794 F02
7
40
70
100
130
160
190
VS = ±12V
V+ = 12V
RBIAS
SHDN
SHDNREF
RBIAS =
25.6 – 2k
V+ – 1.2V
IS PER AMPLIFIER (mA)
25.6
V+ – 1.2V
RBIAS + 2k
RBIAS (k)
4
7
10
50
90
130
170
210
250
30
70
100
150
190
230
270 290
I SUPPLY
PER
AMPLIFIER
(mA)
20
25
30
35
40
1794 F03
5
10
15
0
45
VS = ±12V
V+ = 12V
RBIAS
SHDN
SHDNREF
RBIAS =
64 – 5k
V+ – 1.2V
IS PER AMPLIFIER (mA)
64
V+ – 1.2V
RBIAS + 5k
Figure 2. RBIAS to V+ Current Control
Figure 3. RBIAS to Ground Current Control
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