LT1568CGN datasheet(4/16 Pages) LINER

Part #	LT1568CGN

Description	Very Low Noise, High Frequency Active RC, Filter Building Block

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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4 / 16 page

LT1568

4

1568f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Filter Gain, fC = 1MHz,

Test Frequency = 300kHz (0.3 • fC)

q

–0.05

0.05

0.25

dB

VS = 5V, RFIL = 1.28k

Test Frequency = 750kHz (0.75 • fC)

q

–1.45

–1.20

–0.85

dB

(Measured with Respect to DC Gain)

Test Frequency = 1MHz (1 • fC)

q

–3.60

–3.20

–2.80

dB

Test Frequency = 2MHz (2 • fC)

q

–13.7

–13.2

–12.5

dB

Test Frequency = 4MHz (4 • fC)

–25.0

dB

Filter Gain, fC = 10MHz,

Test Frequency = 1MHz (0.1 • fC)

q

–0.1

0.02

0.25

dB

VS = 5V, RFIL = 128Ω

Test Frequency = 7.5MHz (0.75 • fC)

q

–1.5

–1.0

–0.50

dB

(Measured with Respect to DC Gain)

Test Frequency = 10MHz (1 • fC)

q

–3.5

–3.0

–2.40

dB

Test Frequency = 20MHz (2 • fC)

q

–14.2

–13.2

–12.2

dB

Test Frequency = 40MHz (4 • fC)

–27.5

dB

Filter Gain Mismatch

fC = 1MHz, fIN = fC

q

–0.25

±0.02

0.25

dB

(

VOUTA – VOUTB)fC = 10MHz, fIN = fC

q

–0.30

±0.02

0.30

dB

Wideband Output Noise

fC = 1MHz, RFIL = 1.28k, BW = 2MHz

18

µVRMS

fC = 10MHz, RFIL = 128Ω, BW = 20MHz

34

µVRMS

THD

Total Harmonic Distortion

fC = 1MHz, RFIL = 1.28k,

– 84

dB

fIN = 200kHz, VIN = 1VP-P

fC = 10MHz, RFIL = 128Ω,– 69

dB

fIN = 2MHz, VIN = 1VP-P

Specifications are for the

OUTA or OUTB of a single 2nd order section (A or B) with respect to VGND = VGNDA = VGNDB, gain = 1,

RFIL = R11 = R21 = R31 = R12 = R22 = R32, (see Block Diagram) The q denotes the specifications which apply over the full

operating temperature range, otherwise specifications and typical values are at TA = 25°C. VS = single 5V, EN pin to logic “low,”

RL = 400Ω connected to midsupply, unless otherwise noted.

Specifications are for the output

(OUTA or OUTB) of a single 2nd order section (A or B) with respect to VGND = VGNDA = VGNDB,

gain = –1, RFIL = R11 = R21 = R31 = R12 = R22 = R32, (see Block Diagram). The q denotes the specifications which apply over the

full operating temperature range, otherwise specifications and typical values are at TA = 25°C. VS = single 5V, EN pin to logic “low,”

RL = 400Ω connected to midsupply, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ADC

DC Gain

q

0.99

1

1.01

V/V

VOS(OUT)

DC Offset Voltage

VS = 3V, fC = 1MHz, RFIL = 1.28k

q

–9

–2

5

mV

(VOUTA – VGNDA) or (VOUTB – VGNDB)VS = 5V, VS = ±5V, fC = 1MHz, RFIL = 1.28k

q

–10

–1

10

mV

∆VOS(OUT)

DC Offset Voltage Mismatch

VS = 3V, fC = 1MHz, RFIL = 1.28k

q

–8

±28

mV

(VOUTA – VGNDA) – (VOUTB – VGNDB)VS = 5V, VS = ±5V, fC = 1MHz, RFIL = 1.28k

q

–10

±210

mV

Transfer Function Characteristics for Each Section (A or B) to Single-Ended Output (OUTA or OUTB)

fC

Cutoff Frequency Range (Note 7)

VS = 3V, VS = 5V, VS = ±5V

q

0.2

10

MHz

TC

Cutoff Frequency Temperature Coefficient

q

±1

ppm/

°C

Filter Gain, fC = 1MHz,

Test Frequency = 300kHz (0.3 • fC)

q

–0.10

0.15

0.40

dB

VS = 5V, RFIL = 1.28k

Test Frequency = 750kHz (0.75 • fC)

q

–1.40

–1.00

–0.65

dB

(Measured with Respect to DC Gain)

Test Frequency = 1MHz (1 • fC)

q

–3.50

–3.10

–2.60

dB

Test Frequency = 2MHz (2 • fC)

q

–13.7

–13.0

–12.5

dB

Test Frequency = 4MHz (4 • fC)

–25.0

dB

FILTER ELECTRICAL CHARACTERISTICS

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