LTC1043MJ/883 [Linear]
LTC1043MJ/883;LTC1043
Dual Precision
Instrumentation Switched Capacitor
Building Block
U
FEATURES
DESCRIPTIO
The LTC®1043 is a monolithic, charge-balanced, dual
switched capacitor instrumentation building block. A pair
of switches alternately connects an external capacitor to
an input voltage and then connects the charged capacitor
across an output port. The internal switches have a
break-before-make action. An internal clock is provided
and its frequency can be adjusted with an external
capacitor.TheLTC1043canalsobedrivenwithanexternal
CMOS clock.
■
Instrumentation Front End with 120dB CMRR
Precise, Charge-Balanced Switching
Operates from 3V to 18V
■
■
■
■
■
■
Internal or External Clock
Operates up to 5MHz Clock Rate
Low Power
Two Independent Sections with One Clock
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APPLICATIO S
The LTC1043, when used with low clock frequencies,
provides ultra precision DC functions without requiring
precise external components. Such functions are
differential voltage to single-ended conversion, voltage
inversion, voltage multiplication and division by 2, 3, 4, 5,
etc. The LTC1043 can also be used for precise V–F and
F–V circuits without trimming, and it is also a building
block for switched capacitor filters, oscillators and
modulators.
■
Precision Instrumentation Amplifiers
■
Ultra Precision Voltage Inverters, Multipliers
and Dividers
■
V–F and F–V Converters
■
Sample-and-Hold
■
Switched Capacitor Filters
The LTC1043 is manufactured using Linear Technology’s
enhanced LTCMOSTM silicon gate process.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATIO
Instrumentation Amplifier
CMRR vs Frequency
5V
140
C
S
= C = 1µF
H
4
5V
120
100
80
8
3
7
8
+
1
1µF
1/2 LTC1013
V
OUT
C
H
2
–
11
12
4
1µF
(EXTERNAL)
DIFFERENTIAL
INPUT
–5V
C
S
60
1µF
40
13
16
17
14
20
R1
R2
100
1k
10k
100k
FREQUENCY OF COMMON MODE SIGNAL
CMRR > 120dB AT DC
CMRR > 120dB AT 60Hz
DUAL SUPPLY OR SINGLE 5V
GAIN = 1 + R2/R1
1/2 LTC1043
LTC1043 • TA02
0.01µF
LTC1043 • TA01
V
≈ 150µV
OS
∆V
–5V
OS
≈ 2µV/°C
∆T
COMMON MODE INPUT VOLTAGE INCLUDES THE SUPPLIES
1043fa
1
LTC1043
W W
U W
U W
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ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
ORDER PART
NUMBER
Supply Voltage ........................................................ 18V
Input Voltage at Any Pin .......... –0.3V ≤ VIN ≤ V+ + 0.3V
Operating Temperature Range
LTC1043C ................................... –40°C ≤ TA ≤ 85°C
LTC1043M (OBSOLETE).............–55°C ≤ TA ≤ 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
1
2
3
4
5
6
7
8
9
S3B
18
17
16
15
14
13
12
11
10
SH
B
+
–
V
C
C
B
LTC1043CN
LTC1043CSW
–
+
C
OSC
B
S4B
S4A
V
S2B
S1B
S1A
S2A
NC
S3A
–
C
A
+
C
A
SH
A
N PACKAGE
18-LEAD PDIP
SW PACKAGE
18-LEAD PLASTIC SO
T
JMAX
T
JMAX
= 100°C, θ = 100°C/W PACKAGE (N)
JA
= 150°C, θ = 85°C/W PACKAGE (SW)
JA
D PACKAGE
18-LEAD SIDE BRAZED (HERMETIC)
LTC1043MD
OBSOLETE PACKAGE
Consider the N18 Package as an Alternate Source
LTC1043 • POI01
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
■
denotes specifications which apply over the full operating temperature
+
–
range, otherwise specifications are at T = 25°C. V = 10V, V = 0V, LTC1043M operates from –55°C ≤ T ≤ 125°C; LTC1043C operates from
A
A
–40°C ≤ T ≤ 85°C, unless otherwise noted.
A
LTC1043M
LTC1043C
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX MIN TYP MAX UNITS
I
Power Supply Current
Pin 16 Connected High or Low
0.25
0.4
0.7
0.25
0.4
0.7
mA
mA
S
■
■
■
■
■
–
C
(Pin 16 to V ) = 100pF
0.4
0.65
1
0.4
0.65
1
mA
mA
OSC
I
OFF Leakage Current
ON Resistance
Any Switch, Test Circuit 1 (Note 2)
6
6
100
500
6
6
100
pA
nA
I
R
R
Test Circuit 2, V = 7V, 1 = ±0.5mA
240
400
700
240
400
700
Ω
Ω
ON
IN
+
–
V = 10V, V = 0V
ON Resistance
Test Circuit 2, V = 3.1V, 1 = ±0.5mA
400
700
1
400
700
1
Ω
kΩ
ON
IN
+
–
V
= 5V, V = 0V
–
f
I
Internal Oscillator Frequency
C
C
(Pin 16 to V ) = 0pF
185
34
185
34
kHz
kHz
kHz
OSC
OSC
OSC
–
(Pin 16 to V ) = 100pF
20
15
50
75
20
15
50
75
Test Circuit 3
■
■
+
–
Pin Source or Sink Current
Pin 16 at V or V
40
70
100
40
70
100
µA
µA
OSC
Break-Before-Make Time
Clock to Switching Delay
Max External CLK Frequency
25
75
5
25
75
5
ns
ns
C
C
Pin Externally Driven
OSC
f
Pin Externally Driven with CMOS Levels
MHz
dB
M
OSC
+
–
CMRR
Common Mode Rejection Ratio V = 5V, V = –5V, –5V < V < 5V
120
120
CM
DC to 400Hz
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: OFF leakage current is guaranteed but not tested at 25°C.
1043fa
2
LTC1043
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TYPICAL PERFOR A CE CHARACTERISTICS (Test Circuits 2 through 4)
Power Supply Current vs
Power Supply Voltage
RON vs VIN
RON vs VIN
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
550
500
450
400
350
300
250
200
150
100
280
260
240
220
200
180
160
140
120
100
+
+
–
V
V
T
= 10V
= 0V
V
V
T
= 5V
R
(PEAK)
R
(PEAK)
T
= –55°C
ON
ON
A
–
= 0V
C
= 0pF
OSC
= 0.0047pF
= 25°C
= 25°C
C
C
C
A
A
OSC
OSC
OSC
I = 100µA
I = 100µA
V
V
IN
IN
T
= 25°C
= 0pF
A
C
OSC
= 0.0047pF
I = 100µA
I = 100µA
T
C
= 125°C
A
= 0pF
I = mA
I = mA
OSC
= 0.0047pF
0
2
4
6
8
10 12 14 16 18 20
0
1
2
3
4
5
0
1
2
3
4
5
6
7
8
9
10
V
(V)
V
IN
(V)
V
(V)
IN
SUPPLY
LTC1043 • TPC01
LTC1043 • TPC02
LTC1043 • TPC03
RON (Peak) vs Power Supply
Voltage
RON (Peak) vs Power Supply
Voltage and Temperature
RON vs VIN
260
240
220
200
180
160
140
120
100
80
1000
900
800
700
600
500
400
300
200
100
0
1100
1000
900
800
700
600
500
400
300
200
100
+
V
V
T
= 15V
= 0V
= 25°C
R
(PEAK)
R
(PEAK)
R
(PEAK)
ON
ON
ON
V
= 1.6V
IN
–
A
I = 100µA
I = 100µA
I = 100µA
V
V
V
IN
IN
IN
I = 100µA
T = 125°C
A
V
≈ 3.2V
IN
I = mA
V
≈ 7V
IN
V
T
= 70°C
A
V
≈ 11V
IN
+
3V ≤ V + ≤18V
–
A
V
T
= 0V
= 25°C
≈ 15.1V
IN
T
= –55°C
A
0
2
4
6
8
10 12 14 16 18 20
(V)
0
2
4
6
8
10 12 14 16 18 20
(V)
0
2
4
6
8
10 12 14 16 18 20
(V)
V
V
V
SUPPLY
IN
SUPPLY
LTC1043 • TPC04
LTC1043 • TPC05
LTC1043 • TPC06
Oscillator Frequency, fOSC
vs COSC
Oscillator Frequency, fOSC
vs Supply Voltage
Normalized Oscillator Frequency,
fOSC vs Supply Voltage
250
225
200
175
150
125
100
75
1M
2.0
1.8
1.6
1.4
1.2
1
T
A
= 25°C
T
= 25°C
0pF < C
A
< 0.01µF
OSC
A
T
= 25°C
C
= 0pF
100k
OSC
+
–
= 10V, V = 0V
V
+
–
= 5V, V = 0V
V
10k
1k
+
–
= 15V, V = 0V
V
0.8
0.6
0.4
0.2
0
50
C
= 100pF
OSC
25
100
0
2
4
6
8
V
10 12 14 16 18 20
(V)
0
2
4
6
8
10 12 14 16 18 20
(V)
0
2k
4k
6k
(pF)
8k
10k
V
C
SUPPLY
SUPPLY
OSC
LTC1043 • TPC07
LTC1043 • TPC08
LTC1043 • TPC09
1043fa
3
LTC1043
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TYPICAL PERFOR A CE CHARACTERISTICS (Test Circuits 2 through 4)
Oscillator Frequency, fOSC
vs Ambient Temperature, TA
COSC Pin ISINK, ISOURCE
vs Supply Voltage
Break-Before-Make Time, tNOV
,
vs Supply Voltage
350
325
300
275
250
225
200
175
150
125
100
100
75
80
70
C
OSC
= 0pF
T
= 25°C
A
I
T
= –55°C
= 25°C
SINK,
A
60
I
T
A
SINK,
50
40
30
20
I
T
A
= –55°C
SOURCE,
50
I
T
= 25°C
A
SOURCE,
+
–
V
= 10V, V = 0V
25
I
T = 125°C
A
SINK,
+
–
V
= 5V, V = 0V
+
–
I
T = 125°C
SOURCE, A
V
= 15V, V = 0V
0
10
50
75 100 125
0
2
4
6
8
10 12 14 16 18
–50
0
25
–25
0
6
2
4
8
10 12 14 16 18 20
AMBIENT TEMPERATURE (°C)
V
(V)
SUPPLY
LTC1043 • TPC11
LTC1043 • TPC10
LTC1043 • TPC12
W
BLOCK DIAGRA
S1A
7
S2A
8
+
10
11
12
SH
C
C
A
A
–
A
S3A
13
S4A
14
CHARGE
BALANCING
CIRCUITRY
S1B
6
S2B
5
+
SH
1
2
3
C
C
B
B
–
B
S3B
18
S4B
15
CHARGE
BALANCING
CIRCUITRY
THE CHARGE BALANCING CIRCUITRY SAMPLES THE VOLTAGE
AT S3 WITH RESPECT TO S4 (PIN 16 HIGH) AND INJECTS A
SMALL CHARGE AT THE C PIN (PIN 16 LOW).
THIS BOOSTS THE CMRR WHEN THE LTC1043 IS USED AS AN
INSTRUMENTATION AMPLIFIER FRONT END.
FOR MINIMUM CHARGE INJECTION IN OTHER TYPES OF
APPLICATIONS, S3A AND S3B SHOULD BE GROUNDED
+
V
+
NON-OVERLAPPING
CLOCK
4
+
–
V
C
V
OSC
16
17
OSCILLATOR
–
V
THE SWITCHES ARE TIMED AS SHOWN WITH PIN 16 HIGH
LTC1043 • BD01
1043fa
4
LTC1043
TEST CIRCUITS
Test Circuit 1. Leakage Current Test
Test Circuit 2. RON Test
(7, 13, 6, 18)
(8, 14, 5, 15)
(7, 13, 6, 18)
(8, 14, 5, 15)
NOTE: TO OPEN SWITCHES,
S1 AND S3
A
SHOULD BE CONNECTED
+
V
–
IN
TO V . TO OPEN S2, S4,
+
0V TO 10V
C
TO V
PIN SHOULD BE
OSC
(11, 12, 2, 3)
+
C
OSC
(11, 12, 2, 3)
100µA to 1mA
CURRENT SOURCE
A
LTC1043 • TC01
LTC1043 • TC02
Test Circuit 3. Oscillator Frequency, fOSC
Test Circuit 4. CMRR Test
7
8
V
OUT
–
V
(TEST PIN)
2
4
5
6
17
16
10
11
12
C
OSC
+
V
+
CAPACITORS ARE
NOT ELECTROLYTIC
LTC1043
1µF
1µF
+
+
IV
13
14
LTC1043 • TC03
+
–
+
V
≤ V ≤ V
CM
V
CM
CMRR = 20 LOG
(
)
V
OUT
NOTE: FOR OPTIMUM CMRR, THE C
SHOULD
OSC
BE LARGER THAN 0.0047µF, AND
THE SAMPLING CAPACITOR ACROSS
PINS 11 AND 12 SHOULD BE PLACED
OVER A SHIELD TIED TO PIN 10
LTC1043 • TC04
W U U
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APPLICATIO S I FOR ATIO
Common Mode Rejection Ratio (CMRR)
1/2 LTC1043
7
8
The LTC1043, when used as a differential to single-ended
converter rejects common mode signals and preserves
differential voltages (Figure 1). Unlike other techniques,
the LTC1043’s CMRR does not degrade with increasing
common mode voltage frequency. During the sampling
mode, the impedance of Pins 2, 3 (and 11, 12) should be
reasonably balanced, otherwise, common mode signals
will appear differentially. The value of the CMRR depends
on the value of the sampling and holding capacitors
(CS, CH) and on the sampling frequency. Since the
common mode voltages are not sampled, the
common mode signal frequency can well exceed the
sampling frequency without experiencing aliasing
phenomena. The CMRR of Figure 1 is measured by
+
C
11
12
+
+
+
V
C
V
D
C
H
D
S
–
C
13
14
V
CM
C
S,
C ARE MYLAR OR POLYSTRENE
H
LTC1043 • AI01
Figure 1. Differential to Single-Ended Converter
1043fa
5
LTC1043
W U U
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APPLICATIO S I FOR ATIO
shorting Pins 7 and 13 and by observing, with a precision
DVM, the change of the voltage across CH with respect to
an input CM voltage variation. During the sampling and
holding mode, charges are being transferred and minute
voltage transients will appear across the holding capaci-
tor. Although the RON on the switches is low enough to
allow fast settling, as the sampling frequency increases,
the rate of charge transfer increases and the average
voltage measured with a DVM across it will increase
proportionally; this causes the CMRR of the sampled data
system, as seen by a “continuous” instrument (DVM), to
decrease (Figure 2).
Shielding the Sampling Capacitor for Very High CMRR
Internal or external parasitic capacitors from the C+ pin(s)
to ground affect the CMRR of the LTC1043 (Figure 1).
The common mode error due to the internal junction
capacitancesoftheC+ Pin(s)2and11iscancelledthrough
internal circuitry. The C+ pin, therefore, should be used as
the top plate of the sampling capacitor. The interpin
capacitance between pin 2 and dummy Pin 1 (11 and 10)
appears in parallel with the sampling capacitor so it does
not degrade the CMRR. A shield placed underneath
the sampling capacitor and connected to either Pin 1 or 3
helps to boost the CMRR in excess of 120dB (Figure 5).
Switch Charge Injection
Excessive external parasitic capacitance between the C–
pins and ground indirectly degrades CMRR; this becomes
visible especially when the LTC1043 is used with clock
frequencies above 2kHz. Because of this, if a shield is
used, the parasitic capacitance between the shield and
circuit ground should be minimized.
Figure 3 shows one out of the eight switches of the
LTC1043, configured as a basic sample-and-hold circuit.
When the switch opens, a ‘‘hold step’’ is observed and its
magnitude depends on the value of the input voltage.
Figure4showschargeinjectedintotheholdcapacitor. For
instance, a2pCbofchargeinjectedintoa0.01µFcapacitor
causes a 200µV hold step. As shown in Figure 4, there is
a predictable and repeatable charge injection cancellation
when the input voltage is close to half the supply voltage
of the LTC1043. This is a unique feature of this product,
containing charge-balanced switches fabricated with a
self-aligning gate CMOS process. Any switch of the
LTC1043, when powered with symmetrical dual supplies,
will sample-and-hold small signals around ground with-
out any significant error.
It is recommended that the outer plate of the sampling
capacitor be connected to the C– pin(s).
Input Pins, SCR Sensitivity
An internal 60Ω resistor is connected in series with the
input of the switches (Pins 5, 6, 7, 8, 13, 14, 15, 18) and
it is included in the RON specification. When the input
voltage exceeds the power supply by a diode drop, current
will flow into the input pin(s). The LTC1043 will not latch
until the input current reaches 2mA–3mA. The device will
140
C
= C = 1µF
H
S
5V
120
100
80
C
= 1µF, C = 0.1µF
ZH
S
2
6
+
V
1/2 LTC1013
OUT
1/8 LTC1043
1000pF
–
V
IN
–5V
60
SAMPLE
+
V
40
HOLD TO PIN 16
0V
LTC1043 • AI03
20
100
1k
10k
100k
f
(Hz)
OSC
LTC1043 • AI02
Figure 2. CMRR vs Sampling Frequency
Figure 3
1043fa
6
LTC1043
W U U
APPLICATIO S I FOR ATIO
U
recoverfromthelatchmodewhentheinputdrops3Vto4V
below the voltage value which caused the latch. For
instance, if an external resistor of 200Ω is connected in
series with an input pin, the input can be taken 1.3V above
thesupplywithoutlatchingtheIC.Thesameappliesforthe
C+ and C– pins.
with an external clock to override the internal oscillator.
Although standard 7400 series CMOS gates do not
guarantee CMOS levels with the current source and sink
requirements of Pin 16, they will in reality drive the Cosc
pin. CMOS gates conforming to standard B series output
drive have the appropriate voltage levels and more than
enough output current to simultaneously drive several
LTC1043 COSC pins. The typical trip levels of the Schmitt
trigger (Figure 6) are given below.
C
OSC Pin (16), Figure 6
The Cosc pin can be used with an external capacitor, Cosc,
connected from Pin 16 to Pin 17, to modify the internal
oscillator frequency. If Pin 16 is floating, the internal 24pF
capacitor, plus any external interpin capacitance, set the
oscillator frequency around 190kHz with ±5V supply. The
typical performance characteristics curves provide the
necessary information to set the oscillator frequency for
various power supply ranges. Pin 16 can also be driven
SUPPLY
TRIP LEVELS
V = 3.4VV = 1.35V
H
+
–
V = 5V, V = 0V
L
+
–
V = 10V, V = 0V
V = 6.5VV = 2.8V
H L
+
–
V = 15V, V = 0V
V = 9.5VV = 4.1V
H
L
12
+
–
V
V
= 15V
= 0V
10
8
+
–
V
V
= 10V
= 0V
6
1
OUTSIDE FOIL
4
+
V
–
V
C
S
2
3
= 5V
= 0V
2
0
PRINTED CIRCUIT
BOARD AREA
10 12
0
2
4
6
8
14 16
LTC1043
V
(V)
IN
LTC1043 • AI05
LTC1043 • AI04
Figure 5. Printed Circuit Board Layout
Showing Shielding the Sampling Capacitor
Figure 4. Individual Switch Charge Injection
vs Input Voltage
+
V
4
38µF
C
OSC
16
TO CLK GENERATOR
C
OSC
(EXTERNAL)
24pF
17
–
V
(24pF)
(24pF + C
f
= 190kHz •
OSC
)
OSC
LTC1043 * AI06
Figure 6. Internal Oscillator
1043fa
7
LTC1043
U
TYPICAL APPLICATIO S
Divide by 2
Multiply by 2
Ultra Precision Voltage Inverter
1/2 LTC1043
1/2 LTC1043
V
OUT
= –V
IN
1/2 LTC1043
7
8
V
IN
7
8
V
7
8
V
= V /2
IN
V
IN
OUT
OUT
1µF
11
12
11
12
11
1µF
1µF
1µF
1µF
1µF
12
V
13
16
14
17
IN
13
16
14
17
13
16
14
17
0.01µF
0.01µF
0.01µF
V
V
V
= –V ±2ppm
OUT
–
+
IN
+
V
= V /2 ± 1ppm
V
= 2V ± 5ppm
< V < V
OUT
IN
OUT
IN
IN
+
+
–
0 ≤ V ≤ V
3 ≤ V ≤ 18V
0 ≤ V ≤ V /2
3 ≤ V ≤ 18V
= +5V, V = –5V
IN
IN
+
+
LTC1043 * A03
LTC1043 • A01
LTC1043 • A02
Precision Multiply by 3
Precision Multiply by 4
Divide by 3
V
IN
LTC1043
LTC1043
LTC1043
V
IN
7
8
7
8
7
8
V
IN
11
12
11
12
11
1µF
1µF
1µF
12
13
6
14
5
13
6
13
6
14
5
14
5
V
OUT
V
OUT
2V
IN
1µF
V
OUT
= 4V
IN
2
3
2
3
2
1µF
1µF
1µF
1µF
1µF
1µF
1µF
3
V
18
16
15
17
18
17
OUT
18
16
15
17
15
16
1µF
0.01µF
0.01µF
0.01µF
V
= 3V ±10ppm
V
= 4V ±40ppm
V
= V /3 ±3ppm
IN
OUT
IN
OUT
IN
OUT
IN
+
+
+
0 < V < V /3
3V
0 ≤ V ≤ V /4
3V
0 ≤ V ≤ V
IN
IN
+
+
<
<
<
<
18V
LTC1043 • A06
V
18V
LTC1043 • A04
V
LTC1043 • A05
1043fa
8
LTC1043
U
TYPICAL APPLICATIO S
Divide by 4
0.005% V/F Converter
LT1009
2.5k
–5V
1k
LTC1043
V
IN
7
8
17
5V
1/2 LTC1043
11
1µF
8
7
1µF
12
1µF
11
12
f : 0kHz TO 30kHz
OUT
14
13
16
13
6
14
5
4
5V
0.01µF
GAIN
2.5k
6.19k
V
IN
0V TO 3V
V
OUT
–
1µF
LF356
–5V
+
2
1µF
3
1µF
30pF
22k
330k
18
16
15
17
Q1
2N2907A
1µF
0.01µF
–5V
LTC1043 • A08
+
0 ≤ V ≤ V
IN
V
OUT
= V /4 ±5ppm
IN
LTC1043 • A07
0.01% Analog Multiplier
1/4 LTC1043
1k
1µF
–5V
14
5V
13
LT1004-1.2V
20k
12
OUTPUT
TRIM
0.001µF†
80.6k*
7.5k*
7
2
3
Y
INPUT
–
+
0.01µF
6
LT1056
1µF
16
6
4
5V
1/4 LTC1043
–5V
2
7
X
INPUT
–
5
6
OUTPUT
XY ±0.01%
LT1056
30pF
3
330k
22k
+
4
2
OPERATE LTC1043 FROM ±5V
† POLYSTYRENE, MOUNT CLOSE
0.001µF†
–5V
2N2907A
*
1% FILM RESISTOR
(FOR START-UP)
ADJUST OUTPUT TRIM
SO X • Y = OUTPUT ±0.01%
1µF
–5V
LTC1043 • A09
1043fa
9
LTC1043
U
TYPICAL APPLICATIO S
Single 5V Supply, Ultra Precision
Voltage Controlled Current Source with
Ground Referred Input and Output
Instrumentation Amplifier
5V
5V
8
3
2
INPUT
0V TO 2V
LTC1043
+
+
7
3
2
1
7
8
+
–
1/2 LT1013
6
OUTPUT
= 1000
LTC1052
1
A
–
V
8
4
11
12
4
0.1µF 0.1µF
1µF
1µF
INPUT
0.68µF
99.9k
100Ω
5V
4
–
13
6
14
5
1k
43k
+
V
= 5V
8
7
0.22µF
10k
2
3
11
12
1µF
1µF
1N914
1µF
100Ω
NONPOLARIZED
1µF
18
16
15
14
17
13
16
≈ –0.5V
V
IN
1/2 LTC1043
1
OUT
=
100Ω
17
4
INPUT AND OUTPUT VOLTAGE RANGE INCLUDES GROUND.
INPUT REFERRED OFFSET ERRORS ARE TYPICALLY 3µV WITH
1µV OF NOISE
5V
~
CMRR ~ 120dB
0.0047
0.001µF
LTC1043 • A10
OPERATES FROM A SINGLE 5V SUPPLY
LTC1043 • A11
Precision Instrumentation Amplifier
5V
CHOPPER
1/4 LTC1043
AC AMPLIFIER
5V
PHASE
SENSITIVE
DEMODULATOR
DC
OUTPUT AMPLIFIER
1µF
4
1/2 LTC1043
1µF
+ INPUT
6
5
7
3
2
7
1/4 LTC1043
1µF
11
+
5V
6
13
LT1056
100k
2
3
7
1M
8
12
2
–
+
–
4
6
100k 100k
OUTPUT
LT1056
1µF
1µF
14
–5V
4
3
–5V
100Ω
R2
100k
– INPUT
18
16
15
17
0.01
OFFSET = 10µV
R1
100Ω
–5V
DRIFT = 0.1µV/°C
0.01µF
FULL DIFFERENTIAL INPUT
CMRR = 140dB
OPEN LOOP GAIN > 108
GAIN = R2/R1 + 1
I
= 1nA
BIAS
LTC1043 • A12
1043fa
10
LTC1043
U
TYPICAL APPLICATIO S
Lock-In Amplifier (= Extremely Narrow-Band Amplifier)
THERMISTOR BRIDGE
IS THE SIGNAL SOURCE
SYNCHRONOUS
DEMODULATOR
10k*
10k*
5V
T1
500Hz
5V
SINE DRIVE
6.19k
6.19k
6.19k
4
1
3
2
3
2
–
+
+
–
5V
1/4 LTC1043
6
LM301A
1
13
LT1007
–5V
8
2
3
3
RT
–
+
12
16
1M
6
V
= 1000 • DC
OUT
BRIDGE SIGNAL
100k
LT1012
–5V
14
4
30pF
1µF
–5V
100Ω
+
T1 = TF5SX17ZZ, TOROTEL
0.01µF
47µF
R
= YSI THERMISTOR 44006
T
≈ 6.19k AT 37.5°C
*
MATCH 0.05%
6.19k = VISHAY S-102
OPERATE LTC1043 WITH
±5V SUPPLIES
PHASE TRIM
0.002
5V
50k
10k
5V
LOCK-IN AMPLIFIER TECHNIQUE
USED TO EXTRACT VERY SMALL
SIGNALS BURIED INTO NOISE
1k
2
8
+
–
7
LT1011
1
LTC1043 • A013
3
4
–5V
ZERO CROSSING DETECTOR
50MHz Termal RMS/DC Converter
5V
5V
4
5V
30k*
30k*
10k
1/2 LTC1043
3
2
8
5V
CALIBRATION ADJUST
20k
6
5
+
–
1
5
LT1013
4
+
–
7
DC OUTPUT
0V TO 3.5V
2
LT1013
100k*
6
1µF
1µF
1µF
1µF
10k
10k
16
15
3
0.01µF
301Ω*
10k
10k
18
0.01µF
300mV
10V
RMS
INPUT
17
BRN
RED
RED
T2A
GRN
N
T2
GRN
1A
T1B
T2B
2% ACCURACY DC 50MHZ
100:1 CREST FACTOR CAPABILITY
T1 TO T2 = YELLOW SPRINGS INST. CO.
THERMISTOR COMPOSITE
ENCLOSE T1 AND T2 IN STYROFOAM
LTC1043 • A14
*1% RESISTOR
1043fa
11
LTC1043
U
TYPICAL APPLICATIO S
Quad Single 5V Supply, Low Hold Step, Sample-and-Hold
5V
2
3
13
12
4
–
–
1
14
OUTPUT
OUTPUT
1/4 LT1014
1/4 LT1014
7
8
6
5
NC
NC
+
+
11
C
C
L
0.01µF
L
11
2
0.01µF
V
V
IN
IN
6
9
–
–
7
8
OUTPUT
OUTPUT
1/4 LT1014
1/4 LT1014
5
10
13
14
18
16
15
NC
NC
+
+
C
C
L
L
12
V
3
0.01µF
0.01µF
V
HOLD
IN
IN
LTC1043 • A15
17
4
SAMPLE
– 5V
FOR 1V ≤ V ≤ 4V, THE HOLD STEP IS ≤ 300µV
IN
ACQUISITION TIME ~ 8 • R
C FOR 10-BIT ACCURACY
H
ON
LTC1043 • A16
Single Supply Precision Linearized Platinum RTD Signal Conditioner
250k*
(LINEARITY CORRECTION LOOP)
5V
10k*
5V
3
2
8
2.4k
+
1
1/2 LT1013
2.74k*
LT1009
2.5V
–
4
50k
ZERO
ADJUST
8.25k*
0.1µF
4
2k
0V TO 4V = 0°C TO 400°C
±0.05°C
1/2 LTC1043
1/2 LTC1043
5
6
7
8
5
6
+
7
1/2 LT1013
1k
5k
–
GAIN
11
2
ADJUST
1µF
1µF
1µF
887Ω
1µF
8.06k*
12
3
1k*
13
15
16
14
1mA
18
17
R
100Ω
AT 0°C
p
R
p
= ROSEMOUNT 118MFRTD
*1% FILM RESISTOR
TRIM SEQUENCE:
0.01µF
SET SENSOR TO 0°C VALUE. ADJUST ZERO FOR 0V OUT
SET SENSOR TO 100°C VALUE. ADJUST GAIN FOR 1,000V OUT
SET SENSOR TO 400°C VALUE. ADJUST LINEARITY FOR 4,000V OUT
LTC1043 • A17
REPEAT AS REQUIRED
1043fa
12
LTC1043
U
TYPICAL APPLICATIO S
0.005% F/V Converter
10k
GAIN TRIM
75k*
1µF
1/4 LTC1043
14
5V
1k
13
–5V
–
1µF
LT1004-1.2C
0V TO 3V OUTPUT
LF356
+
12
–5V
1000pF
5V
4
*75k = TRW # MTR-5/120ppm
FREQUENCY IN
0kHz TO 30kHz
–5V
16
17
LTC1043 • A18
High Frequency Clock Tunable Bandpass Filter
R1
10k
R2
10k
10k
5V
R
IN
V
–
IN
1/2 LTC1043
7
8
LT1056
+
–5V
11
12
CLOCK
INPUT
1000pF
5V
16
13
200pF
BANDPASS
OUTPUT
5V
4
14
–
+
1/2 LTC1043
5
6
LT1056
R
= 10k
Q
–5V
2
1000pF
5V
200pF
3
f
CLK
R2
R1
BANDPASS CENTER FREQUENCY f
=
•
O
31.4
BANDPASS GAIN AT f IS: R /R
O
Q
IN
15
R
R2
18
–
+
Q
R2
R1
Q =
LT1056
f
Q
≤ 100kHz
AT 100kHz f IS ≤10
O MAX
MAX
(f • Q) MAX ≤ 1MHz
CLK MAX
17
O
O
–5V
–5V
f
≤ 3MHz, Q < 2
LTC1043 • A19
1043fa
13
LTC1043
U
TYPICAL APPLICATIO S
Frequency-Controlled Gain Amplifier
1/2 LTC1043A
1/2 LTC1043B
13B
14B
13A
14A
12A
0.01µF
11A
12B
100pF
11B
16B
7B
16A
7A
GAIN CONTROL
0kHz TO 10kHz = GAIN 0 TO 1000
8B
8A
V
IN
5V
0.01µF
7
2
–
6
V
OUT
LT1056
3
+
4
FOR DIFFERENTIAL INPUT, GROUND PIN 8A AND USE PINS 13A AND 7A FOR INPUTS
• 0.01µF
–5V
f
IN
1kHz • 100pF
GAIN =
; GAIN IS NEGATIVE AS SHOWN
FOR SINGLE-ENDED INPUT AND POSITIVE GAIN, GROUND PIN 8A AND USE PIN 7A FOR INPUT
USE ±5V SUPPLIES FOR LTC1043
LTC1043 • A20
Relative Humidity Sensor Signal Conditioner
0.01µF
1/4 LTC1043
8
7
16
17
–5V
11
470k
1k*
100pF
5V
7
1/4 LTC1043
500
90%
RH TRIM
2
3
13
14
–
10k
6
3
2
LT1056
+
–
6
OUTPUT
0V TO 1V = 0% TO 100%
LM301A
1
+
12
4
8
–5V
1µF
1µF
LT1004
1.2V
9k*
SENSOR
22M
100pF
10k
5% RH TRIM
33k
* = 1% FILM RESISTOR
SENSOR = PANAMETRICS # RHS
≈ 500pF AT RH = 76%
1.7 pF/%RH
1k*
LTC1043 • A21
1043fa
14
LTC1043
U
TYPICAL APPLICATIO S
Linear Variable Differential Transformer (LVDT), Signal Conditioner
1/4 LTC1043
0.005µF
0.005µF
7
4
8
30k
5V
5V
11
RD-BLUE
30k
8
3
2
+
–
1.5kHz
1
LT1013
YEL-BLK
4
100k
5
6
+
–5V
OUTPUT
0V ±2.5V
0M 2.50M
BLUE
GRN
7
AMPLITUDE STABLE
SINE WAVE SOURCE
1/2 LT1013
1µF
10k
–
1N914
200k
4.7k
YEL-RED
LT1004
1.2V
BLK
Q1
2N4338
10k GAIN TRIM
LVDT
12
+
7.5k
1.2k
10µF
–5V
17
14
13
1/4 LTC1043
LVDT = SCHAEVITZ E-100
5V
5V
100k
0.01µF
1k
3
2
8
+
–
7
100k
PHASE
TRIM
LT1011
TO PIN 16, LTC1043
1
4
–5V
LTC1043 • A22
Precision Current Sensing in Supply Rails
I
IN
SHUNT CAN BE IN POSITIVE
OR NEGATIVE SUPPLY LEAD
R
SHUNT
1/2 LTC1043
V
7
8
OUT
11
+
1µF
1µF
12
13
16
14
17
0.01µF
LTC1043 • A23
1043fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LTC1043
U
PACKAGE DESCRIPTIO
D Package
18-Lead Side Brazed (Hermetic)
(Reference LTC DWG # 05-08-1210)
.165
.910
(23.114)
MAX
.485
(4.191)
MAX
(12.319)
MAX
.005
(0.127)
MIN
.020 – .060
(0.508 – 1.524)
17
18
16
15
14
13
12
11
10
.290
(7.366)
TYP
.008 – .015
(0.203 – 0.381)
PIN NO. 1
IDENT
.100
(2.54)
BSC
.054
(1.372)
TYP
.125
(3.175)
MIN
.300
(7.620)
REF
9
1
2
3
4
5
6
7
8
.015 – .023
(0.381 – 0.584)
D18 0801
OBSOLETE PACKAGE
N Package
18-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.900*
.130 ± .005
.300 – .325
.045 – .065
(22.860)
MAX
(7.620 – 8.255)
(3.302 ± 0.127)
(1.143 – 1.651)
18
17
16
15
14
13
12
11
10
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
.255 ± .015*
(6.477 ± 0.381)
+.035
–.015
.325
.120
(3.048)
MIN
.018 ± .003
(0.457 ± 0.076)
.005
(0.127)
MIN
.100
(2.54)
BSC
+0.889
8.255
1
2
3
5
6
9
4
7
8
(
)
–0.381
NOTE:
INCHES
N18 1002
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
SW Package
18-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
.050 BSC .045 ±.005
.030 ±.005
TYP
.447 – .463
(11.354 – 11.760)
NOTE 4
N
14 13
11
15
12
10
18 17 16
N
.325 ±.005
.420
MIN
.394 – .419
(10.007 – 10.643)
NOTE 3
1
2
3
N/2
NOTE:
1. DIMENSIONS IN
N/2
9
INCHES
(MILLIMETERS)
RECOMMENDED SOLDER PAD LAYOUT
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES
ON THE BOTTOM OF PACKAGES ARE THE
MANUFACTURING OPTIONS.
.291 – .299
(7.391 – 7.595)
NOTE 4
2
3
5
7
8
1
4
6
.037 – .045
THE PART MAY BE SUPPLIED WITH OR
WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE
MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT
EXCEED .006" (0.15mm)
.093 – .104
.010 – .029
(0.254 – 0.737)
(0.940 – 1.143)
× 45°
(2.362 – 2.642)
.005
(0.127)
RAD MIN
0° – 8° TYP
.050
(1.270)
BSC
.004 – .012
(0.102 – 0.305)
.009 – .013
(0.229 – 0.330)
NOTE 3
.014 – .019
.016 – .050
(0.356 – 0.482)
TYP
(0.406 – 1.270)
S18 (WIDE) 0502
1043fa
LW/TP 1202 1K REV A • PRINTED IN USA
16 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
■
■
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 1985
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