LTC1052/LTC7652
1
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The LTC
1052 and LTC7652 are low noise zero-drift op
amps manufactured using Linear Technology's enhanced
LTCMOS
TM
silicon gate process. Chopper-stabilization
constantly corrects offset voltage errors. Both initial offset
and changes in the offset due to time, temperature and
common mode voltage are corrected. This, coupled with
picoampere input currents, gives these amplifiers
unmatched performance.
Low frequency (1/f) noise is also improved by the
chopping technique. Instead of increasing continuously
at a 3dB/octave rate, the internal chopping causes noise to
decrease at low frequencies.
The chopper circuitry is entirely internal and completely
transparent to the user. Only two external capacitors
are required to alternately sample-and-hold the offset
correction voltage and the amplified input signal. Control
circuitry is brought out on the 14-pin and 16-pin versions
to allow the sampling of the LTC1052 to be synchronized
with an external frequency source.
Zero-Drift
Operational Amplifier
, LTC and LT are registered trademarks of Linear Technology Corporation.
FEATURES
DESCRIPTIO
U
Thermocouple Amplifiers
Strain Gauge Amplifiers
Low Level Signal Processing
Medical Instrumentation
Guaranteed Max Offset: 5V
Guaranteed Max Offset Drift: 0.05V/C
Typ Offset Drift: 0.01V/C
Excellent Long Term Stability: 100nV/Month
Guaranteed Max Input Bias Current: 30pA
Over Operating Temperature Range:
Guaranteed Min Gain: 120dB
Guaranteed Min CMRR: 120dB
Guaranteed Min PSRR: 120dB
Single Supply Operation: 4.75V to 16V
(Input Voltage Range Extends to Ground)
External Capacitors can be Returned to V
with No
Noise Degradation
Ultralow Noise, Low Drift Amplifier
Noise Spectrum
APPLICATIO S
U
FREQUENCY (Hz)
VOLTAGE NOISE DENSITY (nV/
Hz)
0
160
140
120
100
80
60
40
20
0
400
100
200
300
500
LTC1052/7652 TA02
LTCMOS is a trademark of Linear Technology Corporation.
Teflon is a trademark of DuPont.
3
2
3
4
6
7
4
100
INPUT
5V
5V
5V
+
LT
1007
LTC1052
+
OUTPUT
2
8
1
0.1
F
0.1
F
0.1
F
5V
100k
3K
68k
7
5V
1
5V
100k
6
8
1.5k
VOS = 3
V
VOS
T = 50nV/
C
NOISE = 0.06
V
P-P
0.1Hz TO 10Hz
LTC1052/7652 TA01
TYPICAL APPLICATIO
U
LTC1052/LTC7652
2
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Total Supply Voltage (V
+
to V
) ............................... 18V
Input Voltage ........................ (V
+
+ 0.3V) to (V
0.3V)
Output Short Circuit Duration .......................... Indefinite
Storage Temperature Range .................. 55C to 150C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Notes 1 and 2)
PACKAGE/ORDER I FOR ATIO
U
U
W
ABSOLUTE AXI U RATI GS
W
W
W
U
Operating Temperature Range
LTC1052C/LTC7652C .......................... 40C to 85C
LTC1052M (OBSOLETE).....................55C to 125C
Lead Temperature (Soldering, 10 sec).................. 300C
LTC1052CN8
REPLACES
ICL7650CPA
LTC1052CJ8
LTC1052MJ8
ICL7650IJA
ORDER PART NUMBER
ORDER PART NUMBER
LTC7652CH
LTC1052CH
LTC1052MH
REPLACES
ICL7652CTV
ICL7652ITV
ICL7650CTV-1
ICL7650ITV-1
ICL7650CTV
ICL7650ITV
ICL7650MTV
1
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 110
C,
JA
= 150
C/W
8
C
EXTA
+ N
2
7
IN
3
6
C
EXTB
V
+
OUTPUT
4
5
V
OUTPUT
CLAMP
+
TOP VIEW
+
7
6
3
4
2
5
8
1
TOP VIEW
C
EXTB
C
EXTA
IN
+ IN
OUTPUT
METAL CAN H PACKAGE
V
+
/CASE
V
LTC1052 OUTPUT CLAMP
LTC7652 C
RETURN
J8 PACKAGE, 8-LEAD CERDIP
LTC1052CSW
REPLACES
LTC1052CS
ORDER PART NUMBER
ORDER PART NUMBER
LTC1052CN
LTC1052CJ
LTC1052MJ
REPLACES
ICL7652CPD
ICL7650CPD
ICL7652IJD
ICL7650IJD
ICL7650MJD
T
JMAX
= 110
C,
JA
= 150
C/W
1
2
3
4
5
6
7
8
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC (WIDE) SO
16
15
14
13
12
11
10
9
J PACKAGE, 14-LEAD CERDIP
TOP VIEW
1
N PACKAGE, 14-LEAD CERDIP
T
JMAX
= 110
C,
JA
= 130
C/W
14
2
13
3
12
4
11
5
10
6
9
7
8
+
C
EXTB
NC (GUARD)
C
EXTA
INT/EXT
CLK IN
CLK OUT
IN
V +
+ IN
OUTPUT
NC (GUARD)
OUTPUT CLAMP
V
C
RETURN
C
EXTB
NC (GUARD)
C
EXTA
INT/EXT
CLK IN
CLK OUT
IN
V +
+ IN
OUTPUT
NC (GUARD)
OUTPUT CLAMP
V
C
RETURN
NC
NC
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
Consider the N8 Package for Alternate Source
OBSOLETE PACKAGE
LTC1052/LTC7652
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ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Connecting any terminal to voltages greater than V
+
, or less than
V
, may cause destructive latch-up. It is recommended that no sources
operating from external supplies be applied prior to power-up of the
LTC1052/LTC7652.
Note 3: These parameters are guaranteed by design. Thermocouple effects
preclude measurement of the voltage levels in high speed automatic
testing. V
OS
is measured to a limit determined by test equipment
capability. Voltages on C
EXTA
and C
EXTB
, A
VOL
, CMRR and PSRR are
measured to insure proper operation of the nulling loop to ensure meeting
the V
OS
and V
OS
drift specifications. See Package-Induced V
OS
in the
Applications Information section.
Note 4: Output clamp not connected.
Note 5: Current noise is calculated from the formula: i
n
= (2q I
B
)
1/2
, where
q = 1.6 10
19
coulomb.
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
The
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25C.
V
S
= 5V, test circuit TC1, unless otherwise noted.
LTC1052M
LTC1052C/LTC7652C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 3)
0.5
5
0.5
5
V
V
OS
/Temp Average Input Offset Drift
(Note 3)
0.01
0.05
0.01
0.05
V/C
V
OS
/Time Long-Term Offset Voltage Stability
100
100
nV/Month
I
OS
Input Offset Current
30
90
30
90
pA
2000
350
pA
I
B
Input Bias Current
1
30
1
30
pA
1000
175
pA
e
nP-P
Input Noise Voltage
R
S
= 100, DC to 10HZ, TC3
1.5
1.5
V
P-P
R
S
= 100, DC to 1HZ, TC3
0.5
0.5
V
P-P
I
n
Input Noise Current
f = 10Hz (Note 5)
0.6
0.6
fA/Hz
CMRR
Common Mode Rejection Ratio
V
CM
= V
to 2.7V
120
140
120
140
dB
PSRR
Power Supply Rejection Ratio
V
SUPPLY
= 2.375V to 8V
120
150
120
150
dB
A
VOL
Large-Signal Voltage Gain
R
L
= 10k, V
OUT
= 4V
120
150
120
150
dB
V
OUT
Maximum Output Voltage Swing
R
L
= 10k
4.7
4.85
4.7
4.85
V
(Note 4)
R
L
= 100k
4.95
4.95
V
SR
Slew Rate
R
L
= 10k, C
L
= 50pF
4
4
V/s
GBW
Gain Bandwidth Product
1.2
1.2
MHz
I
S
Supply Current
No Load
1.7
2.0
1.7
2.0
mA
3.0
3.0
mA
f
S
Internal Sampling Frequency
330
330
Hz
Clamp On Current
R
L
= 100k
25
100
25
100
A
Clamp Off Current
4V < V
OUT
< 4V
10
100
10
100
pA
2
1
nA
Input Noise Voltage
V
S
= 5V, TEST CIRCUIT (TC3)
DC TO 1Hz
DC TO 10Hz
5V
0
0
5V
10 SEC.
LTC1052/LTC7652
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TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Aliasing Error
Common Mode Input Range vs
Supply Voltage
Overload Recovery
(Output Clamp Not Used)
OVERDRIVE
REMOVED
A
V
= 100
Small-Signal Transient Response*
Gain Phase vs Frequency
SUPPLY VOLTAGE (V)
0
COMMON MODE RANGE (V)
0
4
8
4
8
2
4
6
1
3
5
7
8
2
2
6
6
LTC1052/7652 TPC04
V
CM
= V
FREQUENCY (Hz)
0
VOLTAGE GAIN (dB)
20
60
100
120
100
10
4
10
5
10
7
LTC1052/LTC7652 TPC06
20
10
3
10
6
80
40
40
PHASE SHIFT (DEGREES)
180
160
120
80
60
200
100
140
220
V
S
= 5V
C
L
= 100pF
GAIN
PHASE
Offset Voltage vs Sampling
Frequency
1OHz
P-P
Noise vs Sampling
Frequency
Input Bias Current vs
Temperature
SAMPLING FREQUENCY, f
S
(Hz)
0
0
V
OS
(
V)
2
4
6
8
10
12
500
1000
1500
2000
V
SUPPLY= 5V
LTC1052/7652 TPC01
SAMPLING FREQUENCY, f
S
(Hz)
100
0
10Hz PEAK-TO-PEAK NOISE (
V)
1
2
3
4
1k
10k
5
V
SUPPLY= 5V
LTC1052/7652 TPC02
AMBIENT TEMPERATURE, T
A
(C)
50
0
INPUT BIAS CURRENT, I
B
(pA)
100
300
400
500
1000
700
0
50
75
LTC1052/7652 TPC03
200
800
900
600
25
25
100
125
GUARANTEED
GUARANTEED
OUTPUT SPECTRUM (dB)
(3Hz BANDWIDTH)
f
I
f
S
50Hz/DIV
f
S
f
I
V
S
= 5V
A
V
= 1
TEST CIRCUIT TC2
IV/DIV
50ms/DIV
V
S
= 5V
OUTPUT VOLTAGE (20mV/DIV)
A
V
= 1
R
L
= 10k
C
L
= 100pF
V
S
= 5V
*RESPONSE IS NOT DEPENDENT ON PHASE OF CLOCK
2s/DIV
Large-Signal Transient Response*
OUTPUT VOLTAGE (2mV/DIV)
A
V
= 1
R
L
= 10k
C
L
= 100pF
V
S
= 5V
2s/DIV
LTC1052/LTC7652
5
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Broadband Noise, C
EXT
= 0.1F
Supply Current vs Supply Voltage
INPUT REFERRED NOISE
(5
V/DIV)
A
V
= 1000
1ms/DIV
INPUT REFERRED NOISE
(5
V/DIV)
A
V
= 1000
1ms/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Broadband Noise, C
EXT
= 1.0F
Broadband Noise Test Circuit (TC2)
C
EXTB
C
EXTA
R1
1k
R2
1M
3
2
7
6
8
4
1
5V
R3
1k
5V
+
LTC1052
LTC1052/7652 TPC07
Output Short-Circuit Current vs
Supply Voltage
Supply Current vs Temperature
TOTAL SUPPLY VOLTAGE, V
+
TO V
(V)
4
0
SUPPLY CURRENT, I
S
(mA)
0.5
1.0
1.5
2.0
2.5
6
5
8
10
12
LTC1052/LTC7652 TPC08
14
16
AMBIENT TEMPERATURE, T
A
(C)
50
SUPPLY CURRENT, I
S
(mA)
2.0
3.0
25
75
1.0
25
0
50
100
125
0
SUPPLY VOLTAGE = 5V
LTC1052/LTC7652 TPC09
Sampling Frequency vs Voltage
Comparator Operation
Sampling Frequency vs
Temperature
TOTAL SUPPLY VOLTAGE, V
+
TO V
(V)
4
0
SAMPLING FREQUENCY, f
S
(Hz)
100
200
300
400
600
6
8
10
12
LTC1052/LTC7652 TPC11
14
16
500
T
A
= 25C
5
AMBIENT TEMPERATURE, T
A
(C)
50
SAMPLING FREQUENCY, f
S
(Hz)
400
500
600
25
75
LT1052/LTC7652 TPC12
300
200
25
0
50
100
125
100
0
SUPPLY VOLTAGE = 5V
0.1F
0.1F
1k
V
REF
*
3
2
7
6
8
4
1
5V
1k
5V
+
LTC1052
LTC1052/7652 TPC13
V
IN
* 5V V
REF
2.7V
5
TOTAL SUPPLY VOLTAGE, V
+
TO V
(V)
4
8
6
4
2
0
10
20
30
10
14
LTC1052/LTC7652 TPC10
6
8
12
16
SHORT-CIRCUIT OUTPUT CURRENT, I
OUT (mA)
5
I
SINK
V
OUT
= V
+
I
SOURCE
V
OUT
= V
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