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.
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.
PART NUMBER | PACKAGE(1) | PACKAGE SIZE(2) |
---|---|---|
OPA3S328 | RGR (VQFN, 20) | 3.5 mm × 3.5 mm |
YBJ (DSBGA, 24) | 2 mm × 2 mm |
PIN | TYPE | DESCRIPTION | ||
---|---|---|---|---|
NAME | NO. | |||
RGR (VQFN) | YBJ (DSBGA) | |||
DNC | — | B4, C4, D4 | — | Do not connect |
GND | 3 | C5 | Ground | Digital ground pin |
–INA | 18 | A1 | Input | Negative (inverting) input for amplifier A |
–INB | 8 | E1 | Input | Negative (inverting) input for amplifier B |
+INA | 17 | A3 | Input | Positive (noninverting) input for amplifier A |
+INB | 9 | E3 | Input | Positive (noninverting) input for amplifier B |
INSA | 16 | B2 | Input/Output | Switch A1, A2, A3 input |
INSB | 10 | D2 | Input/Output | Switch B1, B2, B3 input |
OUTA | 19 | A2 | Output | Output of amplifier A |
OUTB | 7 | E2 | Output | Output of amplifier B |
OUTSA1 | 14 | C1 | Input/Output | Switch A1 output |
OUTSA2 | 15 | B1 | Input/Output | Switch A2 output |
OUTSA3 | — | B3 | Input/Output | Switch A3 output |
OUTSB1 | 13 | C2 | Input/Output | Switch B1 output |
OUTSB2 | 12 | D1 | Input/Output | Switch B2 output |
OUTSB3 | 11 | D3 | Input/Output | Switch B3 output |
SELA0 | 2 | B5 | Input | Input select for switch matrix A |
SELA1 | 1 | A4 | Input | Input select for switch matrix A |
SELB0 | 4 | D5 | Input | Input select for switch matrix B |
SELB1 | 5 | E4 | Input | Input select for switch matrix B |
V– | 6 | E5 | Power | Negative (lowest) power supply |
V+ | 20 | A5 | Power | Positive (highest) power supply |
Thermal Pad | Thermal Pad | — | — | Exposed thermal pad. Connect to V– |
SELA1 | SELA0 | SELB1 | SELB0 | SHUTDOWN STATUS | SWITCH CONFIGURATION | |||||
---|---|---|---|---|---|---|---|---|---|---|
SWITCH A1 STATUS | SWITCH A2 STATUS | SWITCH A3(1) STATUS | SWITCH B1 STATUS | SWITCH B2 STATUS | SWITCH B3 STATUS | |||||
LOW | LOW | — | — | Amplifier A enabled | CLOSED | OPEN | OPEN | — | — | — |
LOW | HIGH | — | — | Amplifier A enabled | OPEN | CLOSED | OPEN | — | — | — |
HIGH | LOW | — | — | Amplifier A enabled | OPEN | OPEN | CLOSED | — | — | — |
HIGH | HIGH | — | — | In special mode, the SELB0 and SELB1 decoding scheme shown here is ignored, and instead, Table 4-3 applies. | — | — | — | |||
— | — | LOW | LOW | Amplifier B enabled | — | — | — | CLOSED | OPEN | OPEN |
— | — | LOW | HIGH | Amplifier B enabled | — | — | — | OPEN | CLOSED | OPEN |
— | — | HIGH | LOW | Amplifier B enabled | — | — | — | OPEN | OPEN | CLOSED |
— | — | HIGH | HIGH | Amplifier B enabled | — | — | — | OPEN | OPEN | OPEN |
SELA1 | SELA0 | SELB1 | SELB0 | SHUTDOWN STATUS | SWITCH CONFIGURATION | |||||
---|---|---|---|---|---|---|---|---|---|---|
SWITCH A1 STATUS | SWITCH A2 STATUS | SWITCH A3(1) STATUS | SWITCH B1 STATUS | SWITCH B2 STATUS | SWITCH B3 STATUS | |||||
HIGH | HIGH | LOW | LOW | Amplifier A in power down and amplifier B enabled | OPEN | OPEN | OPEN | OPEN | OPEN | OPEN |
HIGH | HIGH | LOW | HIGH | Amplifier A enabled and amplifier B in power down | OPEN | OPEN | OPEN | OPEN | OPEN | OPEN |
HIGH | HIGH | HIGH | LOW | Both Amplifier A and amplifier B enabled | OPEN | OPEN | OPEN | OPEN | OPEN | OPEN |
HIGH | HIGH | HIGH | HIGH | Both Amplifier A and amplifier B in power down | OPEN | OPEN | OPEN | OPEN | OPEN | OPEN |