Datasheet

LT1568
5
1568f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Filter Gain, f
C
= 10MHz, Test Frequency = 1MHz (0.1 • f
C
) ● –0.3 0.15 0.5 dB
V
S
= 5V, R
FIL
= 128Ω Test Frequency = 7.5MHz (0.75 • f
C
) ● –1.2 –0.50 0.0 dB
(Measured with Respect to DC Gain) Test Frequency = 10MHz (1 • f
C
) ● –3.1 –2.30 –1.5 dB
Test Frequency = 20MHz (2 • f
C
) ● –12.2 –11.2 –10.2 dB
Test Frequency = 40MHz (4 • f
C
) –19.1 dB
Filter Gain Mismatch f
C
= 1MHz, f
IN
= f
C
● –0.4 ±0.02 0.4 dB
(
V
OUTA
 – V
OUTB
)f
C
= 10MHz, f
IN
= f
C
● –0.5 ±0.02 0.5 dB
Wideband Output Noise f
C
= 1MHz, R
FIL
= 1.28k, BW = 2MHz 22 µV
RMS
f
C
= 10MHz, R
FIL
= 128Ω, BW = 20MHz 60 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,–75dB
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 typcial 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 differential output (OUTA – OUTA or OUTB – OUTB) of a single 2nd order section (A or B), gain = –2,
R
FIL
= R11 = R21 = R31 = R12 = R22 = R32. All voltages are with respect to V
GND
= V
GNDA
= V
GNDB
. 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
LDIFF
= 800Ω connected at midsupply, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ADC DC Gain ● –2 V/V
V
OS(OUT)
DC Offset Voltage V
S
= 3V, f
C
= 1MHz, R
FIL
= 1.28k ● –4 6 16 mV
(OUTA – OUTA) or (OUTB – OUTB) V
S
= 5V, f
C
= 1MHz, R
FIL
= 1.28k ● –12 2 15 mV
V
S
= ±5V, f
C
= 1MHz, R
FIL
= 1.28k ● –20 –5 10 mV
∆V
OS(OUT)
DC Offset Voltage Mismatch V
S
= 3V, f
C
= 1MHz, R
FIL
= 1.28k ● –8 2 8 mV
(OUTA – OUTA) – (OUTB – OUTB) V
S
= 5V, f
C
= 1MHz, R
FIL
= 1.28k ● –12 –2 12 mV
V
S
= ±5V, f
C
= 1MHz, R
FIL
= 1.28k ● –15 2 15 mV
Transfer Function Characteristics for Each Section (A or B) to Differential Output (OUTA – OUTA or OUTB – 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
) ● –0.05 0.10 0.25 dB
V
S
= 5V, R
FIL
= 1.28k (Note 8) Test Frequency = 750kHz (0.75 • f
C
) ● –1.40 –1.10 –0.80 dB
(Measured with Respect to DC Gain) Test Frequency = 1MHz (1 • f
C
) ● –3.60 –3.20 –2.70 dB
Test Frequency = 2MHz (2 • f
C
) ● –13.7 –13.1 –12.5 dB
Test Frequency = 4MHz (4 • f
C
) –25.0 dB
Filter Gain, f
C
= 10MHz, Test Frequency = 1MHz (0.1 • f
C
) ● –0.20 0.1 0.30 dB
V
S
= 5V, R
FL
= 128Ω (Note 8) Test Frequency = 7.5MHz (0.75 • f
C
) ● –1.30 –0.8 –0.20 dB
(Measured with Respect to DC Gain) Test Frequency = 10MHz (1 • f
C
) ● –3.30 –2.6 –1.90 dB
Test Frequency = 20MHz (2 • f
C
) ● –13.1 –12.1 –11.1 dB
Test Frequency = 40MHz (4 • f
C
) –24.3 dB
FILTER ELECTRICAL CHARACTERISTICS