OPA355-Q1 Datasheet, PDF (11/18 Pages) Texas Instruments – 200-MHz CMOS Operational Amplifier With Shutdown

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8 Detailed Description
OPA355-Q1
SLOS868B – DECEMBER 2013 – REVISED JUNE 2014
8.1 Feature Description
8.1.1 Operating Voltage
The OPA355-Q1 device is specified over a power-supply range of 2.7 to 5.5 V (±1.35 to ±2.75 V). However, the
supply voltage can range from 2.5 to 5.5 V (±1.25 to ±2.75 V). Supply voltages higher than 7.5 V (absolute
maximum) can permanently damage the amplifier.
Parameters that vary significantly over supply voltage or temperature are shown in the Typical Characteristics
section of this data sheet.
8.1.2 Enable Function
The OPA355-Q1 device is enabled by applying a TTL HIGH-voltage level to the Enable pin. Conversely, a TTL
LOW-voltage level disables the amplifier which reduces the supply current from 8.3 mA to only 3.4 μA per
amplifier. This pin voltage is referenced to a single-supply ground. When using a split-supply, such as ±2.5 V, the
enable and disable voltage levels are referenced to V–. Independent Enable pins are available for each channel,
providing maximum design flexibility. For portable battery-operated applications, this feature can be used to
greatly reduce the average current and thereby extend battery life.
The Enable input can be modeled as a CMOS input gate with a 100-kΩ pullup resistor to V+. Left open, the
Enable pin assumes a logic HIGH, and the amplifier turns on.
The Enable time is 100 ns and the disable time is 30 ns which allows the OPA355-Q1 device to operate as a
gated amplifier, or to have the output multiplexed onto a common output bus. When disabled, the output
assumes a high-impedance state.
8.1.3 Output Drive
The output stage supplies a high short-circuit current (typically over 200 mA). Therefore, an on-chip thermal
shutdown circuit is provided to protect the OPA355-Q1 device from dangerously-high junction temperatures. At
160°C, the protection circuit shuts down the amplifier. Normal operation resumes when the junction temperature
cools to below 140°C.
NOTE
Running a continuous DC current in excess of ±60 mA is not recommended. Refer to the
Output Voltage Swing vs Output Current graphs (Figure 21 and Figure 22) in the Typical
Characteristics section.
8.1.4 Input and ESD Protection
All OPA355-Q1 pins are static protected with internal ESD protection diodes tied to the supplies (see Figure 31).
If the current is externally limited to 10 mA by the source or by a resistor, these diodes provide overdrive
protection.
+V_CC
External
Pin
Internal
Circuitry
–V _CC
Figure 31. Internal ESD Protection
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