LM359J National Semiconductor, LM359J Datasheet - Page 6

• Manufacturer Part Number: LM359J
• Description: Dual/ High Speed/ Programmable/ Current Mode Norton Amplifiers
• Manufacturer: National Semiconductor

Application Hints
(Continued)
DC biasing of the output is accomplished by establishing a
reference DC current into the (+) input, I
(+), and requiring
IN
the output to provide the (−) input current. This forces the
output DC level to be whatever value necessary (within the
output voltage swing of the amplifier) to provide this DC ref-
erence current, Figure 2 .
DS007788-7
FIGURE 2.
The DC input voltage at each input is a transistor V
BE
(. 0.6 V
) and must be considered for DC biasing. For
DC
+
most applications, the supply voltage, V
, is suitable and
convenient for establishing I
(+). The inverting input bias
IN
current, I
(−), is a direct function of the programmable input
b
stage current (see current programmability section) and to
obtain predictable output DC biasing set I
(+)
10I
(−).
IN
b
www.national.com
6