Datasheet

LF155, LF156, LF355, LF356, LF357
www.ti.com SNOSBH0C –MAY 2000–REVISED MARCH 2013
R1, R4 matched. Linearity 0.1% over 2 decades.
Figure 49. Decades VCO
Figure 50. Isolating Large Capacitive Loads
• Overshoot 6%
• t
s
10μs
• When driving large C
L
, the V
OUT
slew rate determined by C
L
and I
OUT(MAX)
:
Figure 51. Low Drift Peak Detector
• By adding D1 and R
f
, V
D1
=0 during hold mode. Leakage of D2 provided by feedback path through R
f
.
• Leakage of circuit is essentially I
b
(LF155, LF156) plus capacitor leakage of Cp.
• Diode D3 clamps V
OUT
(A1) to V
IN
−V
D3
to improve speed and to limit reverse bias of D2.
• Maximum input frequency should be << ½πR
f
C
D2
where C
D2
is the shunt capacitance of D2.
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