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LT1568

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

Linear Technology 

LT1568

FILTER ELECTRICAL CHARACTERISTICS

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

Filter Gain, fC = 1MHz,

VS = 5V, RFIL = 1.28k

(Measured with Respect to DC Gain)

Test Frequency = 300kHz (0.3 • fC)

Test Frequency = 750kHz (0.75 • fC)

Test Frequency = 1MHz (1 • fC)

Test Frequency = 2MHz (2 • fC)

Test Frequency = 4MHz (4 • fC)

Filter Gain, fC = 10MHz,

VS = 5V, RFIL = 128Ω

(Measured with Respect to DC Gain)

Test Frequency = 1MHz (0.1 • fC)

Test Frequency = 7.5MHz (0.75 • fC)

Test Frequency = 10MHz (1 • fC)

Test Frequency = 20MHz (2 • fC)

Test Frequency = 40MHz (4 • fC)

Filter Gain Mismatch

(VOUTA – VOUTB)

fC = 1MHz, fIN = fC

fC = 10MHz, fIN = fC

Wideband Output Noise

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

fC = 10MHz, RFIL = 128Ω, BW = 20MHz

THD

Total Harmonic Distortion

fC = 1MHz, RFIL = 1.28k,

fIN = 200kHz, VIN = 1VP-P

fC = 10MHz, RFIL = 128Ω,

fIN = 2MHz, VIN = 1VP-P

q –0.05 0.05 0.25

dB

q –1.45 –1.20 –0.85

dB

q –3.60 –3.20 –2.80

dB

q –13.7 –13.2 –12.5

dB

– 25.0

dB

q –0.1 0.02 0.25

dB

q –1.5 –1.0 –0.50

dB

q –3.5 –3.0 –2.40

dB

q –14.2 –13.2 –12.2

dB

– 27.5

dB

q –0.25 ±0.02 0.25

dB

q –0.30 ±0.02 0.30

dB

18

µVRMS

34

µVRMS

– 84

dB

– 69

dB

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.

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

±2

8

mV

(VOUTA – VGNDA) – (VOUTB – VGNDB)

VS = 5V, VS = ±5V, fC = 1MHz, RFIL = 1.28k

q –10

±2

10

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

TC

Cutoff Frequency Temperature Coefficient

q 0.2

10

MHz

q

±1

ppm/°C

Filter Gain, fC = 1MHz,

VS = 5V, RFIL = 1.28k

(Measured with Respect to DC Gain)

Test Frequency = 300kHz (0.3 • fC)

Test Frequency = 750kHz (0.75 • fC)

Test Frequency = 1MHz (1 • fC)

Test Frequency = 2MHz (2 • fC)

Test Frequency = 4MHz (4 • fC)

q –0.10 0.15 0.40

dB

q –1.40 –1.00 –0.65

dB

q –3.50 –3.10 –2.60

dB

q –13.7 –13.0 –12.5

dB

–25.0

dB

1568f

4

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