LT6003/LT6004/LT6005
TYPICAL APPLICATION
Gain of –50 Ultralow Power Precision Gas Sensor Amplifier
20k
976k*
+
1M
1%
1M
1%
V
S
–
A1
1/2 LT6004
–
CITY TECHNOLOGY
MODEL 40X(2)
A2
1/2 LT6004
+
1M
1%
OXYGEN SENSOR
BURNS 100µA IN AIR
V
= 500mV
OUT
B
S1
A
+
IN AIR
20k
–
(~21% O )
(DURING READ PHASE)
V
S
2
A
–
S3
B
N
1M
1%
C1
0.1µF
X7R
GAIN = –50
A
S2
B
N
100Ω
+
V
I
= 5µV TYPICAL (INPUT REFERRED), AVERAGED
= 3µA
OS
SUPPLY
N
V
= ±0.9V TO ±2.7V
SUPPLY
S1, S2: FAIRCHILD FSA1157 (NC)
S3: FAIRCHILD FSA1156 (NO)
OXYGEN SENSOR
+
V
READ
–
S
V
S
–
NULL
CONNECT SWITCH GND PINS TO V
S
*20M FOR A = 1000
V
S1, S2 ARE NORMALLY CLOSED (N = LOW). S3 IS NORMALLY OPEN (N = LOW). A1's OUTPUT OFFSET IS STORED ON C1.
WHEN A READING IS DESIRED, SWITCHES REVERSE STATE, AND A2 ACTS AS A DIFFERENCE AMPLIFIER FROM THE STORED
OFFSET. NULL PHASE SHOULD BE ASSERTED 200ms OR MORE. A2 SETTLES 50ms AFTER READ PHASE IS ASSERTED, WITH
WORST CASE ROOM TEMPERATURE DROOP RATE IS 0.8µV/ms DOMINATED BY ANALOG SWITCH LEAKAGE CURRENT.
600345 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1490A/LT1491A 50µA Dual/Quad Over-The-Top® Rail-to-Rail Input
950µV V
, Gain Bandwidth = 200kHz
, Gain Bandwidth = 2.7kHz
OS(MAX)
and Output Op Amps
LT1494/LT1495/
LT1496
1.5µA Max Single/Dual/Quad Over-The-Top
Precision Rail-to-Rail Input and Output Op Amps
375µV V
OS(MAX)
LT1672/LT1673/
LT1674
2µA Max, AV ≥ 5, Single/Dual/Quad Over-The-Top Gain of 5 Stable, Gain Bandwidth = 12kHz
Precision Rail-to-Rail Input and Output Op Amps
LT1782
Micropower, Over-The-Top, SOT-23, Rail-to-Rail
Input and Output Op Amps
SOT-23, 800µV V
Shutdown Pin
, I = 55µA
, Gain Bandwidth = 200kHz,
(MAX)
OS(MAX)
S
LT2178/LT2179
17µA Dual/Quad Single Supply Op Amps
120µV V
600µV V
, Gain Bandwidth = 60kHz
OS(MAX)
, Gain Bandwidth = 50kHz, Shutdown
OS(MAX)
LT6000/LT6001/
LT6002
1.8V, 16µA Max Single/Dual/Quad Precision
Rail-to-Rail Op Amps
Over-The-Top is a registered trademark of Linear Technology Corporation.
600345fd
LT 0311 REV D • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
●
●
LINEAR TECHNOLOGY CORPORATION 2006
(408)432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR_DIMENSIONS [ Linear Dimensions ]
