OP162HRU Analog Devices Inc, OP162HRU Datasheet - Page 11

• Manufacturer Part Number: OP162HRU
• Description: IC OPAMP GP R-R 15MHZ LN 8TSSOP
• Manufacturer: Analog Devices Inc

Specifications of OP162HRU

• Rohs Status: RoHS non-compliant
• Amplifier Type: General Purpose
• Number Of Circuits: 1
• Output Type: Rail-to-Rail
• Slew Rate: 13 V/µs
• Gain Bandwidth Product: 15MHz
• Current - Input Bias: 260nA
• Voltage - Input Offset: 25µV
• Current - Supply: 650µA
• Current - Output / Channel: 30mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 12 V, ±1.35 V ~ 6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-TSSOP
• -3db Bandwidth: -

REV. D
Capacitive Load Drive
The OP162/OP262/OP462 is a high speed, extremely accurate
device and can tolerate some capacitive loading at its output.
As load capacitance increases, however, the unity-gain band-
width of the device will decrease. There will also be an increase
in overshoot and settling time for the output. Figure 35 shows
an example of this with the device configured for unity gain and
driving a 10 kW resistor and 300 pF capacitor placed in parallel.
By connecting a series R-C network, commonly called a “snub-
ber” network, from the output of the device to ground, this
ringing can be eliminated and overshoot can be significantly
reduced. Figure 34 shows how to set up the snubber network,
and Figure 36 shows the improvement in output response with
the network added.
Figure 34. Snubber Network Compensation for Capacitive
Loads
Figure 33. Test Circuit for Power On Settling Time
Figure 35. A Photo of a Ringing Square Wave
Figure 32. Oscilloscope Photo of V
0 TO +5V
SQUARE
V
IN
100
100
0%
0%
90
10
90
10
+
–
50mV
2V
50mV
+1
OPx62
+5V
OP462
V
A
R
1 s
S
R
V
L
C
X
= 5V
= 1
= 10k
V
A
C
R
X
S
V
L
L
= 5V
= 300pF
= 10k
= 1
500ns
C
S
10k
L
and V
V
OUT
V
OUT
OUT
–11–
The network operates in parallel with the load capacitor, C
and provides compensation for the added phase lag. The actual
values of the network resistor and capacitor are determined
empirically to minimize overshoot while maximizing unity-gain
bandwidth. Table I shows a few sample snubber networks for
large load capacitors:
Obviously, higher load capacitance will also reduce the unity-
gain bandwidth of the device. Figure 37 shows a plot of unity-
gain bandwidth versus capacitive load. The snubber network
will not provide any increase in bandwidth, but it will substan-
tially reduce ringing and overshoot, as shown in the difference
between Figures 35 and 36.
Total Harmonic Distortion and Crosstalk
The OPx62 device family offers low total harmonic distortion.
This makes it an excellent device choice for audio applications.
Figure 38 shows a graph of THD plus noise figures at 0.001%
for the OP462.
Figure 39 shows a graph of the worst case crosstalk between two
amplifiers in the OP462 device. A 1 V rms signal is applied to
one amplifier while measuring the output of an adjacent ampli-
fier. Both amplifiers are configured for unity gain and supplied
with ± 2.5 V.
Figure 36. A Photo of a Nice Square Wave at the Output
Table I. Snubber Networks for Large Capacitive Loads
10
Figure 37. Unity Gain Bandwidth vs. C
9
8
7
6
5
4
3
2
1
0
10pF
100
0%
90
10
C
<300 pF
500 pF
1 nF
10 nF
LOAD
100pF
50mV
OP162/OP262/OP462
R
140 W
100 W
80 W
10 W
X
C
LOAD
1nF
V
A
C
R
WITH SNUBBER:
1 s
R
C
S
V
L
L
X
X
= 5V
= 300pF
= 10k
= 1
= 140
= 10nF
C
10 nF
10 nF
10 nF
47 nF
X
10nF
LOAD
L
,