OPA3S328
SBOS937A – OCTOBER 2020 – REVISED SEPTEMBER 2021
OPA3S328 40-MHz, Dual, Precision, Low-Noise, Low-Input-Bias-Current
CMOS Operational Amplifier With Integrated Switches
1 Features
3 Description
•
Precision operational amplifier with integrated
switches for transimpedance applications
Wide bandwidth: 40 MHz
Low offset voltage: 60 µV (max)
Very low offset drift: 1 µV/°C (max)
Low input bias current: 0.2 pA
Rail-to-rail input and output
The OPA3S328 is
a
precision, low-voltage,
CMOS operational amplifier (op amp) with
integrated switches that are optimized for flexible
transimpedance applications. Low input bias current
and low input capacitance allows for high-frequency
transimpedance gains at low photocurrent operation
(< 1 nA). The integrated switches, low offset, and
rail-to-rail output performance of the OPA3S328
enable high accuracy across multiple decades of
current values. Small packages, along with integrated
switches, allow for selectable transimpedance
gains and help reduce size for space-constrained
applications.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Zero-crossover input stage
Low voltage noise: 6.1 nV/√Hz at 10 kHz
Low current noise: 0.125 pA/√Hz at 10 kHz
Low leakage switches: 10 pA
Slew rate: 30 V/µs
Quiescent current: 3.8 mA per channel
Current in shutdown mode: 30 µA
Output impedance in shutdown mode: 100 GΩ
Single-supply voltage range: 2.2 V to 5.5 V
Unity-gain stable
Small packages:
– 20-lead, 3.5-mm x 3.5-mm VQFN
– 2.0-mm x 2.0-mm DSBGA
The OPA3S328 features zero-crossover input
technology, giving the flexibility for the input common-
mode range to span the full supply range without
offset deviations. The device provides enable-disable
capability to allow for portable, handheld applications
in test and measurement. When disabled, the
OPA3S328 output impedance is typically 100 GΩ,
allowing for wired-OR applications using multiple
transimpedance channels.
2 Applications
•
•
•
•
•
•
Optical transport inter-dc interconnect
Optical module
Optical network terminal unit (ONT)
Small cell base station
Digital multimeter (DMM)
Data acquisition (DAQ)
Device Information
PART NUMBER
PACKAGE(1)
BODY SIZE (NOM)
3.50 mm × 3.50 mm
2.00 mm × 2.00 mm
VQFN (20)
DSBGA (24)(2)
OPA3S328
(1) For all available packages, see the package option
addendum at the end of the data sheet.
(2) DSBGA package is preview.
V+
OUTA
INSA
50
25
0
OUTSA1
OUTSA2
–
–INA
+INA
+
OPA3S328
OUTSA3
(YBJ Package Only)
SELA1
SELA0
Switch Control
GND
SELB1
SELB0
-25
OUTSB1
OUTSB2
OUTSB3
–
+
–INB
+INB
-50
-3
-2
-1
0
1
2
3
Common-mode Voltage (V)
V–
OUTB
INSB
Input Offset Voltage vs Input Common-Mode
Voltage
Functional Block Diagram
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.