Datasheet

LT1568
4
1568f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Filter Gain, f
C
= 1MHz, Test Frequency = 300kHz (0.3 • f
C
) ● –0.05 0.05 0.25 dB
V
S
= 5V, R
FIL
= 1.28k Test Frequency = 750kHz (0.75 • f
C
) ● –1.45 –1.20 –0.85 dB
(Measured with Respect to DC Gain) Test Frequency = 1MHz (1 • f
C
) ● –3.60 –3.20 –2.80 dB
Test Frequency = 2MHz (2 • f
C
) ● –13.7 –13.2 –12.5 dB
Test Frequency = 4MHz (4 • f
C
) –25.0 dB
Filter Gain, f
C
= 10MHz, Test Frequency = 1MHz (0.1 • f
C
) ● –0.1 0.02 0.25 dB
V
S
= 5V, R
FIL
= 128Ω Test Frequency = 7.5MHz (0.75 • f
C
) ● –1.5 –1.0 –0.50 dB
(Measured with Respect to DC Gain) Test Frequency = 10MHz (1 • f
C
) ● –3.5 –3.0 –2.40 dB
Test Frequency = 20MHz (2 • f
C
) ● –14.2 –13.2 –12.2 dB
Test Frequency = 40MHz (4 • f
C
) –27.5 dB
Filter Gain Mismatch f
C
= 1MHz, f
IN
= f
C
● –0.25 ±0.02 0.25 dB
(
V
OUTA
 – V
OUTB
)f
C
= 10MHz, f
IN
= f
C
● –0.30 ±0.02 0.30 dB
Wideband Output Noise f
C
= 1MHz, R
FIL
= 1.28k, BW = 2MHz 18 µV
RMS
f
C
= 10MHz, R
FIL
= 128Ω, BW = 20MHz 34 µV
RMS
THD Total Harmonic Distortion f
C
= 1MHz, R
FIL
= 1.28k, –84 dB
f
IN
= 200kHz, V
IN
= 1V
P-P
f
C
= 10MHz, R
FIL
= 128Ω,–69dB
f
IN
= 2MHz, V
IN
= 1V
P-P
Specifications are for the OUTA or OUTB of a single 2nd order section (A or B) with respect to V
GND
= V
GNDA
= V
GNDB
, gain = 1,
R
FIL
= R11 = R21 = R31 = R12 = R22 = R32, (see Block Diagram) The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications and typical values are at T
A
= 25°C. V
S
= single 5V, EN pin to logic “low,”
R
L
= 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 V
GND
= V
GNDA
= V
GNDB
,
gain = –1, R
FIL
= R11 = R21 = R31 = R12 = R22 = R32, (see Block Diagram). The ● denotes the specifications which apply over the
full operating temperature range, otherwise specifications and typical values are at T
A
= 25°C. V
S
= single 5V, EN pin to logic “low,”
R
L
= 400Ω connected to midsupply, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ADC DC Gain ● 0.99 1 1.01 V/V
V
OS(OUT)
DC Offset Voltage V
S
= 3V, f
C
= 1MHz, R
FIL
= 1.28k ● –9 –2 5 mV
(V
OUTA
– V
GNDA
) or (V
OUTB
– V
GNDB
)V
S
= 5V, V
S
= ±5V, f
C
= 1MHz, R
FIL
= 1.28k ● –10 –1 10 mV
∆V
OS(OUT)
DC Offset Voltage Mismatch V
S
= 3V, f
C
= 1MHz, R
FIL
= 1.28k ● –8 ±28 mV
(V
OUTA
– V
GNDA
) – (V
OUTB
– V
GNDB
)V
S
= 5V, V
S
= ±5V, f
C
= 1MHz, R
FIL
= 1.28k ● –10 ±210 mV
Transfer Function Characteristics for Each Section (A or B) to Single-Ended Output (OUTA or OUTB)
f
C
Cutoff Frequency Range (Note 7) V
S
= 3V, V
S
= 5V, V
S
= ±5V ● 0.2 10 MHz
TC Cutoff Frequency Temperature Coefficient ● ±1 ppm/°C
Filter Gain, f
C
= 1MHz, Test Frequency = 300kHz (0.3 • f
C
) ● –0.10 0.15 0.40 dB
V
S
= 5V, R
FIL
= 1.28k Test Frequency = 750kHz (0.75 • f
C
) ● –1.40 –1.00 –0.65 dB
(Measured with Respect to DC Gain) Test Frequency = 1MHz (1 • f
C
) ● –3.50 –3.10 –2.60 dB
Test Frequency = 2MHz (2 • f
C
) ● –13.7 –13.0 –12.5 dB
Test Frequency = 4MHz (4 • f
C
) –25.0 dB
FILTER ELECTRICAL CHARACTERISTICS