LTC1968 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1968

Precision Wide Bandwidth, RMS-to-DC Converter

Linear Technology 

LTC1968

TYPICAL PERFOR A CE CHARACTERISTICS

Bandwidth to 500kHz

202

0.5%/DIV

201

CAVE = 10µF

VIN = 200mVRMS

200

199

198

197

196

195

0

100 200 300 400 500

INPUT FREQUENCY (kHz)

1968 G14

Output Accuracy

vs Signal Amplitude

10

1% ERROR

VIN2 = MIDSUPPLY

5

0

–5

–1% ERROR

–10

–15

DC

AC – 60Hz

SINEWAVE

–20

0

0.5

1

1.5

2

VIN1 (VRMS)

1967 G17

DC Transfer Function Near Zero

40

VIN2 = MIDSUPPLY

35 THREE REPRESENTATIVE UNITS

30

25

20

15

10

5

0

–5

–10

–30 –20 –10 0

10 20 30

VIN1 (mV DC)

1968 G15

Output Noise vs Input Frequency

1

PEAK NOISE MEASURED

IN 10 SECOND PERIOD

CAVE = 1µF

0.1

CAVE = 10µF

CAVE = 100µF

0.01

0.001

10k

100k

INPUT FREQUENCY (Hz)

1M

1967 G18

Input Common Mode Rejection

Ratio vs Frequency

90

80

70

60

50

40

30

20 4.5V COMMON

MODE INPUT

10 CONVERSION

TO DC OUTPUT

0

10 100 1k

10k 100k 1M 10M

INPUT FREQUENCY (Hz)

1967 G16

Output Noise vs Device

1

LTC1966

CAVE = 1µF

0.1

LTC1967

CAVE = 1.5µF

LTC1968

CAVE = 6.8µF

0.01

1k

10k

100k

1M

INPUT FREQUENCY (Hz) 1968 G19

AVE CAPACITOR CHOSEN FOR EACH DEVICE

TO GIVE A 1 SECOND, 0.1% SETTLING TIME

1968f

6

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