Datasheet

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LTC1043

1043fa

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Instrumentation Front End with 120dB CMRR

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Precise, Charge-Balanced Switching

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Operates from 3V to 18V

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Internal or External Clock

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Operates up to 5MHz Clock Rate

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Low Power

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Two Independent Sections with One Clock

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. The LTC1043 can also be driven with an external

CMOS clock.

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.

The LTC1043 is manufactured using Linear Technology’s

enhanced LTCMOS

silicon gate process.

Dual Precision

Instrumentation Switched Capacitor

Building Block

, LTC and LT are registered trademarks of Linear Technology Corporation.

DESCRIPTIO

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Precision Instrumentation Amplifiers

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Ultra Precision Voltage Inverters, Multipliers

and Dividers

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V–F and F–V Converters

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Sample-and-Hold

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Switched Capacitor Filters

Instrumentation Amplifier CMRR vs Frequency

TYPICAL APPLICATIO

LTCMOS is a trademark of Linear Technology Corporation.

FREQUENCY OF COMMON MODE SIGNAL

100

CMRR (dB)

100

120

140

1k 10k 100k

LTC1043 • TA02

= C

= 1µF

LTC1043 • TA01

0.01µF

–5V

DIFFERENTIAL

INPUT

∆

OUT

1µF

R2R1

CMRR > 120dB AT DC

CMRR > 120dB AT 60Hz

DUAL SUPPLY OR SINGLE 5V

GAIN = 1 + R2/R1

≈ 150µV

≈ 2µV/°C

COMMON MODE INPUT VOLTAGE INCLUDES THE SUPPLIES

1/2 LTC1043

1/2 LTC1013

1µF

(EXTERNAL)

–

FEATURES

APPLICATIO S

Summary of content (16 pages)

PAGE 1
LTC1043 Dual Precision Instrumentation Switched Capacitor Building Block DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ 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.
PAGE 2
LTC1043 W W W AXI U U ABSOLUTE RATI GS U U W PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART NUMBER TOP VIEW 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)..................
PAGE 3
LTC1043 U W TYPICAL PERFOR A CE CHARACTERISTICS Power Supply Current vs Power Supply Voltage RON vs VIN 1.6 550 TA = –55°C COSC = 0pF 1.4 COSC = 0.0047pF RON vs VIN RON (PEAK) 500 I = 100µA 450 V IN 1.2 TA = 25°C COSC = 0pF 1.0 COSC = 0.0047pF 0.8 TA = 125°C COSC = 0pF 0.6 COSC = 0.0047pF 0.4 280 V+ = 5V V – = 0V TA = 25°C 0.
PAGE 4
LTC1043 U W TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency, fOSC vs Ambient Temperature, TA COSC Pin ISINK, ISOURCE vs Supply Voltage 350 fOSC (kHz) 275 250 225 200 V+ = 10V, V– = 0V 175 125 V+ – = 5V, V = 0V V+ = 15V, V– = 0V 100 50 25 0 75 100 –50 –25 AMBIENT TEMPERATURE (°C) 80 ISINK, TA = –55°C 75 60 ISINK, TA = 25°C ISOURCE, TA = –55°C 50 ISOURCE, TA = 25°C 50 40 30 25 ISINK, TA = 125°C 20 ISOURCE, TA = 125°C 0 0 125 TA = 25°C 70 tNOV (ns) 300 150 Break-Before-Make
PAGE 5
LTC1043 TEST CIRCUITS Test Circuit 1. Leakage Current Test (7, 13, 6, 18) (7, 13, 6, 18) (8, 14, 5, 15) A 0V TO 10V Test Circuit 2. RON Test + (11, 12, 2, 3) NOTE: TO OPEN SWITCHES, S1 AND S3 SHOULD BE CONNECTED TO V –. TO OPEN S2, S4, COSC PIN SHOULD BE TO V+ COSC + (8, 14, 5, 15) VIN (11, 12, 2, 3) 100µA to 1mA CURRENT SOURCE LTC1043 • TC01 A LTC1043 • TC02 Test Circuit 3. Oscillator Frequency, fOSC Test Circuit 4.
PAGE 6
LTC1043 U W U U 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 capacitor.
PAGE 7
LTC1043 U W U U APPLICATIO S I FOR ATIO recover from the latch mode when the input drops 3V to 4V 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 the supply without latching the IC. The same applies for the C + and C – pins. COSC 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.
PAGE 8
LTC1043 U TYPICAL APPLICATIO S Divide by 2 Multiply by 2 Ultra Precision Voltage Inverter 1/2 LTC1043 1/2 LTC1043 VIN 1/2 LTC1043 7 8 VOUT VOUT = VIN /2 7 7 8 VOUT = –VIN 8 VIN 1µF 11 11 11 1µF 1µF 1µF 1µF 1µF 12 12 12 VIN 13 14 13 17 16 13 14 14 16 16 17 17 0.01µF 0.01µF 0.
PAGE 9
LTC1043 U TYPICAL APPLICATIO S Divide by 4 0.005% V/F Converter –5V VIN 7 LT1009 2.5k 1k LTC1043 8 17 5V 1/2 LTC1043 11 8 1µF 1µF 7 1µF 12 11 fOUT: 0kHz TO 30kHz 14 13 13 14 4 VIN 0V TO 3V VOUT 5 6 6.19k 12 5V GAIN 2.5k 16 0.01µF – 1µF LF356 + 2 1µF 1µF –5V 3 30pF 22k 18 15 16 17 330k Q1 2N2907A 0.01µF 1µF –5V LTC1043 • A08 0 ≤ VIN ≤ V+ VOUT = VIN /4 ±5ppm LTC1043 • A07 0.01% Analog Multiplier 1/4 LTC1043 14 1k –5V 13 LT1004-1.2V 1µF 12 5V YINPUT 7.
PAGE 10
LTC1043 U TYPICAL APPLICATIO S Voltage Controlled Current Source with Ground Referred Input and Output Single 5V Supply, Ultra Precision Instrumentation Amplifier 5V 5V + LTC1043 7 3 8 7 + 6 LTC1052 2 4 1µF INPUT 8 + 1/2 LT1013 OUTPUT AV = 1000 8 – 11 3 INPUT 0V TO 2V 2 – 1 4 1 0.1µF 0.1µF 1µF 0.68µF 12 – 99.9k 100Ω 13 5V 14 1k 4 V+ = 5V 43k 5 6 8 0.22µF 7 10k 2 11 1µF NONPOLARIZED 1µF 1N914 1µF 1µF 3 18 100Ω 12 15 14 ≈ –0.
PAGE 11
LTC1043 U TYPICAL APPLICATIO S Lock-In Amplifier (= Extremely Narrow-Band Amplifier) THERMISTOR BRIDGE IS THE SIGNAL SOURCE SYNCHRONOUS DEMODULATOR 10k* 10k* T1 500Hz SINE DRIVE 4 1 6.19k 3 3 6.19k 2 RT 5V 5V 6.19k 2 + 1/4 LTC1043 6 LT1007 – 3 12 – 5V LM301A 13 + 2 8 1 100k 1M – LT1012 –5V 14 3 –5V 16 30pF + T1 = TF5SX17ZZ, TOROTEL RT = YSI THERMISTOR 44006 ≈ 6.19k AT 37.5°C *MATCH 0.05% 6.19k = VISHAY S-102 OPERATE LTC1043 WITH ±5V SUPPLIES 47µF PHASE TRIM 5V 0.
PAGE 12
LTC1043 U TYPICAL APPLICATIO S Quad Single 5V Supply, Low Hold Step, Sample-and-Hold 5V 2 1/4 LT1014 NC 7 3 8 13 4 – + 1 OUTPUT 1/4 LT1014 NC 11 6 14 OUTPUT + CL 0.01µF 2 VIN VIN 6 9 – 1/4 LT1014 NC 12 5 CL 0.01µF 11 – 13 5 14 7 OUTPUT 1/4 LT1014 + NC 18 10 15 CL 0.01µF 12 OUTPUT + VIN HOLD LTC1043 • A15 16 SAMPLE 8 CL 0.
PAGE 13
LTC1043 U TYPICAL APPLICATIO S 0.005% F/V Converter 75k* 10k GAIN TRIM 1µF 1/4 LTC1043 1k 5V 13 –5V – 14 1µF LT1004-1.
PAGE 14
LTC1043 U TYPICAL APPLICATIO S Frequency-Controlled Gain Amplifier 13A 1/2 LTC1043A 12A 16A GAIN CONTROL 0kHz TO 10kHz = GAIN 0 TO 1000 13B 1/2 LTC1043B 14A 14B 12B 16B 0.01µF 100pF 11A 11B 7A 7B 8A 8B VIN 5V 2 – 0.01µF 7 6 LT1056 3 FOR DIFFERENTIAL INPUT, GROUND PIN 8A AND USE PINS 13A AND 7A FOR INPUTS fIN • 0.
PAGE 15
LTC1043 U TYPICAL APPLICATIO S Linear Variable Differential Transformer (LVDT), Signal Conditioner 1/4 LTC1043 0.005µF 0.005µF 30k 7 5V 5V 30k 3 4 11 8 + 1.5kHz 1 LT1013 2 8 RD-BLUE YEL-BLK – 4 100k 5 – 5V BLUE GRN AMPLITUDE STABLE SINE WAVE SOURCE 6 10k 1N914 4.7k LT1004 1.2V Q1 2N4338 1.2k + 1/2 LT1013 1µF – 10µF OUTPUT 0V ±2.5V 0M 2.50M 200k YEL-RED BLK 10k GAIN TRIM LVDT + 7 12 7.5k –5V 17 13 14 1/4 LTC1043 LVDT = SCHAEVITZ E-100 5V 100k 5V 0.
PAGE 16
LTC1043 U PACKAGE DESCRIPTIO D Package 18-Lead Side Brazed (Hermetic) (Reference LTC DWG # 05-08-1210) .165 (4.191) MAX .485 (12.319) MAX .020 – .060 (0.508 – 1.524) .910 (23.114) MAX .005 (0.127) MIN 17 18 16 15 14 13 12 11 10 .290 (7.366) TYP .008 – .015 (0.203 – 0.381) .100 (2.54) BSC .125 (3.175) MIN .300 (7.620) REF PIN NO. 1 IDENT .054 (1.372) TYP .015 – .023 (0.381 – 0.584) 3 2 1 4 5 7 6 8 9 D18 0801 OBSOLETE PACKAGE N Package 18-Lead PDIP (Narrow .