LT1568 Ver la hoja de datos (PDF) - Linear Technology
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LT1568 Datasheet PDF : 16 Pages
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LT1568
FILTER ELECTRICAL CHARACTERISTICS
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 typcial 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 = 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 –0.3 0.15 0.5
dB
q –1.2 –0.50 0.0
dB
q –3.1 –2.30 –1.5
dB
q –12.2 –11.2 –10.2
dB
– 19.1
dB
q –0.4 ±0.02 0.4
dB
q –0.5 ±0.02 0.5
dB
22
µVRMS
60
µVRMS
– 84
dB
– 75
dB
Specifications are for the differential output (OUTA – OUTA or OUTB – OUTB) of a single 2nd order section (A or B), gain = –2,
RFIL = R11 = R21 = R31 = R12 = R22 = R32. All voltages are with respect to VGND = VGNDA = VGNDB. 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,” RLDIFF = 800Ω connected at midsupply, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ADC
DC Gain
q
–2
V/V
VOS(OUT)
DC Offset Voltage
(OUTA – OUTA) or (OUTB – OUTB)
VS = 3V, fC = 1MHz, RFIL = 1.28k
VS = 5V, fC = 1MHz, RFIL = 1.28k
VS = ±5V, fC = 1MHz, RFIL = 1.28k
q
–4
6
16
mV
q –12
2
15
mV
q –20
–5
10
mV
∆VOS(OUT) DC Offset Voltage Mismatch
(OUTA – OUTA) – (OUTB – OUTB)
VS = 3V, fC = 1MHz, RFIL = 1.28k
VS = 5V, fC = 1MHz, RFIL = 1.28k
VS = ±5V, fC = 1MHz, RFIL = 1.28k
q
–8
2
8
mV
q –12
–2
12
mV
q –15
2
15
mV
Transfer Function Characteristics for Each Section (A or B) to Differential Output (OUTA – OUTA or OUTB – 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 (Note 8)
(Measured with Respect to DC Gain)
Filter Gain, fC = 10MHz,
VS = 5V, RFL = 128Ω (Note 8)
(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)
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)
q –0.05 0.10 0.25
dB
q –1.40 –1.10 –0.80
dB
q –3.60 –3.20 –2.70
dB
q –13.7 –13.1 –12.5
dB
– 25.0
dB
q –0.20
0.1
0.30
dB
q –1.30 –0.8 –0.20
dB
q –3.30 –2.6 –1.90
dB
q –13.1 –12.1 –11.1
dB
– 24.3
dB
1568f
5
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