LTC6256IKC#TRMPBF-ES Linear Technology, LTC6256IKC#TRMPBF-ES Datasheet - Page 15

• Manufacturer Part Number: LTC6256IKC#TRMPBF-ES
• Description: IC OPAMP DUAL 6.5MHZ 8-UTDFN
• Manufacturer: Linear Technology

Specifications of LTC6256IKC#TRMPBF-ES

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 1.8 V/µs
• Gain Bandwidth Product: 6.5MHz
• -3db Bandwidth: 4.5MHz
• Current - Input Bias: 5nA
• Voltage - Input Offset: 100µV
• Current - Supply: 65µA
• Current - Output / Channel: 35mA
• Voltage - Supply, Single/dual (±): 1.8 V ~ 5.25 V, ±0.9 V ~ 2.625 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-µTDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TYPICAL APPLICATIONS
LTC6255 Very Low Power 2nd Order Lowpass Filter
The LTC6256 circuit shown in Figure 4 is a 2nd order,
100kHz, Butterworth lowpass fi lter. The fi lter’s differential
output maximizes the dynamic range in very low voltage
operation. A general 2nd order lowpass circuit is shown in
V
IN
2.49k
10k
V
2.49k
IN
1000pF
(Single-Ended Input and Differential Output)
10k
1.8V
A, 1.8V, 140μA, 100kHz, Lowpass Filter
200kHz 130μA Gain-of-100 Amplifi er
+
–
1/2 LTC6256
Figure 3. Gain of 100 Amplifi er (3dB Bandwidth of 200kHz on 130μA Supply Current)
10μF
100k
100k
100pF
–0.9V
0.9V
90.9k
2
3
–
1/2 LTC6256
+
10k
1.8V
8
0.1μF
–
+
1/2 LTC6256
1
90.9k
625567 F03a
2.49k
6
5
–
+
1/2 LTC6256
2.49k
4
V
OUT
Figure 4
7
Figure 5 with the equations to calculate the RC components
for cutoff frequencies up to 100kHz for a Butterworth or a
Bessel approximation (a Bessel lowpass fi lter has very low
transient response overshoot). In addition the equations
for a 4th order lowpass fi lter are provided to calculate the
RC components for two cascaded 2nd order sections.
625567
LTC6255/LTC6256/LTC6257
V
V
F04a
OUT
OUT
–
+
–10
–20
–30
–40
–50
50
40
30
20
10
0
10
Frequency Response of 40dB
100
–12
–18
–24
–30
–36
–42
Gain Amplifi er
1k
–6
FREQUENCY (Hz)
6
0
10k
10k
Frequency Response
100k
FREQUENCY (Hz)
1M
100k
625567 F03b
10M
625567 F04b
15
1M
625567fa