COS5532
36V, 10MHz
Low-Noise Dual Operational Amplifiers
Features
General Description
■
Operates on ±2.5V to ±18V Supplies
The COS5532 are high performance, low
■
Gain Bandwidth Product: 10MHz
noise
■
Power Bandwidth: 140kHz
excellent dc and ac characteristics. They
■
Slew Rate: 8V/µs
feature very low noise, high output-drive
■
Offset Voltage: 5mV (Max.)
capability,
■
Quiescent Current: 2.8mA
■
■
■
operational
amplifiers
high
combining
unity-gain
and
maximum-output-swing
bandwidths,
low
Output Drive Capability: 2kΩ, 10Vrms typ
distortion,
rate,
Extended Temperature Ranges
short-circuit protection. These operational
From -40°C to +125°C
amplifiers are compensated internally for
Available in SOP-8/MSOP-8/DIP-8
unity-gain operation and can operate from
high
slew
and
output
±2.5 to ±18V dual power supplies or from +5V
to +36V single supplies.
Applications
■
Precision Instrumentation
■
Professional Audio
■
DAC Output Amplifier
■
Active Filters
■
Low Noise Amplifier Front End
Pin Configuration
Rev1.0
Copyright@2018 Cosine Nanoelectronics Inc. All rights reserved
The information provided here is believed to be accurate and reliable. Cosine Nanoelectronics assumes
no reliability for inaccuracies and omissions. Specifications described and contained here are subjected
to change without notice on the purpose of improving the design and performance. All of this information
described herein should not be implied or granted for any third party.
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COS5532
1. Product Specification
1.1 Absolute Maximum Ratings (1)
Parameter
Rating
Units
Power Supply: +Vs to -Vs
36
V
Differential Input Voltage Range
±30
V
Input Voltage (any input)
±15
V
Output Current
50
mA
-65 to 150
°C
150
°C
-40 to 125
°C
2000
V
Storage Temperature Range
Junction Temperature
Operating Temperature Range
ESD Susceptibility, HBM
(1) Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable
above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition,
extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute
maximum ratings are stress ratings only.
1.2 Thermal Data
Parameter
Rating
Unit
Package Thermal Resistance
155 (SOP8)
206 (MSOP8)
125 (DIP8)
°C/W
Rating
Unit
DC Supply Voltage
±2.5V ~ ±18V
V
Input common-mode voltage range
-Vs+2 ~ +Vs-2
V
-40 to +85
°C
1.3 Recommended Operating Conditions
Parameter
Operating ambient temperature
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COS5532
1.4 Electrical Characteristics
(+VS=+15V, -VS=-15V, TA=+25°C, RL=10kΩ to VS/2, unless otherwise noted)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
0.5
5
mV
Input Characteristics
Input Offset Voltage
VOS
Input Offset Voltage Drift
ΔVOS/ΔT
Input Bias Current
IB
200
800
nA
Input Offset Current
IOS
50
200
nA
Common-Mode Voltage Range
VCM
±13
V
Common-Mode Rejection Ratio
CMRR
Open-Loop Voltage Gain
AOL
-40 to 125°C
2
μV/°C
Rs≤10kΩ
70
100
dB
RL ≥ 10kΩ, VO = ±10V
88
110
dB
RL ≥ 2kΩ, VO = ±10V
82
94
dB
RL ≥2kΩ
±12
±13
V
60
mA
Output Characteristics
Output Voltage Swing
VO(PP)
Short-Circuit Current
ISC
Power Supply
Operating Voltage Range
±2.5
Power Supply Rejection Ratio
PSRR
Quiescent Current / Amplifier
IQ
Rs≤10kΩ
80
±18
110
2.8
V
dB
3.5
mA
Dynamic Performance
Gain Bandwidth Product
GBWP
CL=100pF, RL=2kΩ
10
MHz
Slew Rate
SR
CL=100pF, RL=2kΩ,
Av=1
8.0
V/μs
en
f=1kHz
5.0
nV/√Hz
Noise Performance
Voltage Noise Density
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COS5532
2.0 Application Notes
Driving Capacitive Loads
Driving large capacitive loads can cause stability problems for voltage feedback op amps. As the
load capacitance increases, the feedback loop’s phase margin decreases, and the closed loop
bandwidth is reduced. This produces gain peaking in the frequency response, with overshoot and
ringing in the step response. A unity gain buffer (G = +1) is the most sensitive to capacitive loads, but
all gains show the same general behavior.
When driving large capacitive loads with these op amps (e.g., > 100 pF when G = +1), a small series
resistor at the output (RISO in Figure 1) improves the feedback loop’s phase margin (stability) by
making the output load resistive at higher frequencies. It does not, however, improve the bandwidth.
To select RISO, check the frequency response peaking (or step response overshoot) on the bench. If
the response is reasonable, you do not need RISO. Otherwise, start RISO at 1 kΩ and modify its value
until the response is reasonable.
RISO
VOUT
VIN
CL
Figure 1. Indirectly Driving Heavy Capacitive Load
An improvement circuit is shown in Figure 2. It provides DC accuracy as well as AC stability. RF
provides the DC accuracy by connecting the inverting signal with the output, CF and RISO serve to
counteract the loss of phase margin by feeding the high frequency component of the output signal
back to the amplifier’s inverting input, thereby preserving phase margin in the overall feedback loop.
Figure 2. Indirectly Driving Heavy Capacitive Load with DC Accuracy
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COS5532
For noninverting configuration, there are two others ways to increase the phase margin: (a) by
increasing the amplifier’s gain or (b) by placing a capacitor in parallel with the feedback resistor to
counteract the parasitic capacitance associated with inverting node, as shown in Figure 3.
Figure 3. Adding a Feedback Capacitor in the Noninverting Configuration
Power-Supply Bypassing and Layout
The COS5532 operates from a single +5V to +36V supply or dual ±2.5V to ±18V supplies. For
single-supply operation, bypass the power supply +Vs with a 0.1μF ceramic capacitor which should
be placed close to the +Vs pin. For dual-supply operation, both the +Vs and the -Vs supplies should
be bypassed to ground with separate 0.1μF ceramic capacitors. 2.2μF tantalum capacitor can be
added for better performance.
The length of the current path is directly proportional to the magnitude of parasitic inductances and
thus the high frequency impedance of the path. High speed currents in an inductive ground return
create an unwanted voltage noise. Broad ground plane areas will reduce the parasitic inductance.
Thus a ground plane layer is important for high speed circuit design.
Typical Application Circuits
Differential Amplifier
The circuit shown in Figure 4 performs the differential function. If the resistors ratios are equal (R4 /
R3 = R2 / R1), then VOUT = (VIP – VIN) × R2 / R1 + VREF.
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COS5532
Figure 4. Differential Amplifier
Low Pass Active Filter
When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is
often required. The simplest way to establish this limited bandwidth is to place an RC filter at the
noninverting terminal of the amplifier. If even more attenuation is needed, a multiple pole filter is
required. The Sallen-Key filter can be used for this task, as Figure 5. For best results, the amplifier
should have a bandwidth that is 8 to 10 times the filter frequency bandwidth. Failure to follow this
guideline can result in reduction of phase margin. The large values of feedback resistors can couple
with parasitic capacitance and cause undesired effects such as ringing or oscillation in high-speed
amplifiers. Keep resistors value as low as possible and consistent with output loading consideration.
Figure 5. Two-Pole Low-Pass Sallen-Key Active Filter
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COS5532
3. Package Information
3.1 SOP8 (Package Outline Dimensions)
3.2 MSOP8 (Package Outline Dimensions)
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COS5532
3.3 DIP8 (Package Outline Dimensions)
4. Package and Ordering Information
Model
COS5532
Channel
2
Order Number
Package
Package Option
Marking
Information
COS5532SR
SOP-8
Tape and Reel, 3000
COS5532SR
COS5532MR
MSOP-8
Tape and Reel, 3000
COS5532MR
COS5532DR
DIP-8
Tape and Reel, 1500
COS5532DR
COS5532DT
DIP-8
Tube, 50
COS5532DT
5. Related Parts
Part Number
Description
COS1177/2177/4177
36V high precision Op Amps, 5 to 36V Supply, Vos