OPA689 Burr-Brown, OPA689 Datasheet - Page 11

• Manufacturer Part Number: OPA689
• Description: Wideband / High Gain VOLTAGE LIMITING AMPLIFIER
• Manufacturer: Burr-Brown

TYPICAL APPLICATIONS
DUAL SUPPLY, NON-INVERTING AMPLIFIER
Figure 1 shows a non-inverting gain amplifier for dual
supply operation. This circuit was used for AC characteriza-
tion of the OPA689, with a 50
and a 500
shown explicitly in Figures 1 and 2, but will be assumed in
the other figures. The limiter voltages (V
bias currents (I
SINGLE SUPPLY, NON-INVERTING AMPLIFIER
Figure 2 shows an AC coupled, non-inverting gain amplifier
for single supply operation. This circuit was used for AC
FIGURE 1. DC-Coupled, Dual Supply Amplifier.
FIGURE 3. Low Distortion, Limiting ADC Input Driver.
+V
–V
V
IN
S
S
= +5V
= –5V
V
load. The power supply bypass capacitors are
150
IN
49.9
R
VH
G
100
+
+
and I
0.1 F
2.2µF
2.2µF
750
VL
R
F
374
) have the polarities shown.
0.1µF
0.1µF
3
2
18pF
OPA689
4
7
3.01k
3.01k
0.1 F
source, which it matches,
0.1µF
0.1µF
8
5
+2.5V
V
V
1.91k
1.91k
I
2
3
H
I
H
L
VH
VL
6
= –2V
= +2V
V
and V
OPA689
S
1.40k
1.40k
= +5V
4.0pF
750
7
4
L
) and their
500
8
5
6
V
O
24.9
11
characterization of the OPA689, with a 50
it matches, and a 500
capacitors are shown explicitly in Figures 1 and 2, but will
be assumed in the other figures. The limiter voltages (V
and V
polarities shown. Notice that the single supply circuit can
use 3 resistors to set V
circuit usually uses 4 to reference the limit voltages to
ground.
LOW DISTORTION, ADC INPUT DRIVER
The circuit in Figure 3 shows an inverting, low distortion
ADC driver that operates on single supply. The converter’s
internal references bias the op amp input. The 4.0pF and
18pF capacitors form a compensation network that allows
FIGURE 2. AC-Coupled, Single Supply Amplifier.
V
100pF
V
IN
S
= +5V
V
V
L
L
H
= +1.4V
) and their bias currents (I
= +3.6V
53.6
+
0.1µF
2.2µF
IN
787
+3.5V
+1.5V
150
0.1µF
1.50k
1.50k
R
V
750
G
S
REFB
REFT
R
= +5V
F
0.1µF
3
2
100
100
787
H
40MSPS
ADS822
10-Bit
INT/EXT
OPA689
load. The power supply bypass
and V
RSEL
4
7
0.1 F
0.1µF
0.1µF
0.1 F
OPA689
8
5
V
S
L
GND
+V
, where the dual supply
= +5V
I
I
VH
VL
6
S
VH
and I
10-Bit
V
V
Data
523
976
H
L
523
0.1µF
source, which
= 1.3V
= 3.7V
VL
) have the
500
V
O
H
®