OPA2652E BURR-BROWN [Burr-Brown Corporation], OPA2652E Datasheet - Page 10

• Manufacturer Part Number: OPA2652E
• Description: Dual, 700MHz, Voltage-Feedback OPERATIONAL AMPLIFIER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

BANDPASS FILTER
Figure 3 shows a single OPA2652 implementing a sixth-
order bandpass filter. This filter cascades two second-order
Sallen-Key sections with transmission zeros, and a double
real pole section. It has 0.3dB of ripple, –3dB frequencies of
450kHz and 11MHz, and –23dB frequencies of 315kHz and
16MHz. The 20.0
put from capacitive loading. This improves stability with
minimal impact on the filter response. Figure 4 shows the
nominal response simulated by SPICE.
FIGURE 4. Nominal Filter Response.
FIGURE 3. Bandpass Filter.
–10
–15
–20
–25
–30
–35
–40
–5
0
10k
®
OPA2652
V
OUT
100k
resistor isolates the first OPA2652 out-
Frequency (Hz)
100pF
1M
V
IN
200
10M
140
1.0nF
100
2.7nF
2.10k
100M
2.2nF
1.0nF
143
OPA2652
10
1.30k
1/2
24.9
+5V
–5V
VIDEO LINE DRIVER
Figure 5 shows the OPA2652 used as a video line driver. Its
outstanding differential gain and phase allow it to be used in
studio equipment, while its low cost and SOT23-8 package
option will support consumer applications.
FIGURE 5. Video Line Driver.
PULSE DELAY CIRCUIT
Figure 6 shows the OPA2652 used in a pulse delay circuit.
This circuit cascades the two op amps in the OPA2652, each
forming a single pole, active allpass filter. The overall gain
is +1, and the overall delay through the filter is:
Video
Input
–5V
+5V
18pF
OPA2652
n= 2, the number of cascaded stages
t
75.0
1/2
GD
24.9
= n(2RC), overall group delay
402
20.0
12pF
1% Resistors
5% Capacitors
225
107
180pF
–5V
+5V
OPA2652
1/2
402
150pF
158
75.0
Output
Video