LT6004 Linear Technology Corporation, LT6004 Datasheet - Page 16

• Manufacturer Part Number: LT6004
• Description: 1.6v, 1?a Precision Rail-to-rail Input And Output Op Amp
• Manufacturer: Linear Technology Corporation

applications inForMation
LT6003/LT6004/LT6005
ADAPTIVE FILTER IMPROVES INHERENT TRADEOFF OF SETTLING TIME VS NOISE FILTERING. SMALL SIGNAL DC STEPS
SETTLE WITH A 20ms TIME CONSTANT, FOR AN 8Hz NOISE BANDWIDTH. LARGE STEP SIGNALS (>10mV) CAUSE S1 TO
TURN ON, SPEEDING UP THE TIME CONSTANT TO 1ms, FOR IMPROVED SETTLING. AS THE OUTPUT SETTLES BACK TO
WITHIN 10mV, 51 TURNS OFF AGAIN, RESTORING THE 20ms TIME CONSTANT, FOR IMPROVED FILTERING.

V
IN
–
+
1/4 LT6005
249k
249k
A1
–
+
1/4 LT6005
A3
10M
10M
V
V
CC
CC
1M
V
CC
200k
10k
–
V
OUTB
INB
S
LT6700-2
A
OUTA
–
GND
INA
S
S1
0.1µF
Figure 5. Precision 1.25µA Current Source
I
COMP
LOAD
B
OUT
V
R1
1M
Figure 4. Adaptive Filter
LOAD
1/4 LT6005
LOAD
10M
10M
A4
–
+
1/4 LT6005
+
–
–
+
LT6003
A2
I
V
LOAD
S
S1: FAIRCHILD FSA1157
V
I
WITH LARGE SIGNAL
CC
V
CC
= V
S
= 10µA, RISING TO 20µA
= 1.8V TO 5V
=
LOAD
249k
249k
1.25V
R1
600345 F05
+ 2V
V
V
S
OUT
R2
390k
LT1389-1.25
600345 F04
100mV/DIV
50mV/DIV
COMP
5V/DIV
V
OUT
OUT
V
IN
2ms/DIV
600345fb
600345 F04b