LPV542 Datasheet, PDF (18/29 Pages) Texas Instruments – LPV542 Dual Nanopower 1.8 V, 490nA, RRIO CMOS Operational Amplifier

LPV542
SNOSCX9 – MARCH 2015
www.ti.com
9 Power Supply Recommendations
The LPV542 is specified for operation from 1.6 V to 5.5 V (±0.8 V to ±2.75 V) over a –40°C to 125°C
temperature range. Parameters that can exhibit significant variance with regard to operating voltage or
temperature are presented in the Typical Characteristics.
CAUTION
Supply voltages larger than 6 V can permanently damage the device.
For proper operation, the power supplies bust be properly decoupled. For decoupling the supply lines it is
suggested that 10 nF capacitors be placed as close as possible to the operational amplifier power supply pins.
For single supply, place a capacitor between V⁺ and V^– supply leads. For dual supplies, place one capacitor
between V⁺ and ground, and one capacitor between V^– and ground.
Low bandwidth nanopower devices do not have good high frequency (> 1 kHz) AC PSRR rejection against high-
frequency switching supplies and other 1 kHz and above noise sources, so extra supply filtering is recommended
if kilohertz or above noise is expected on the power supply lines.
10 Layout
10.1 Layout Guidelines
The V+ pin should be bypassed to ground with a low ESR capacitor.
The optimum placement is closest to the V+ and ground pins.
Care should be taken to minimize the loop area formed by the bypass capacitor connection between V+ and
ground.
The ground pin should be connected to the PCB ground plane at the pin of the device.
The feedback components should be placed as close to the device as possible to minimize strays.
There is an internal electrical connection between the exposed Die Attach Pad (DAP) and the V- pin. For best
performance the DAP should be connected to the exact same potential as the V- pin. Do not use the DAP as the
primary V- supply. Floating the DAP pad is not recommended. The DAP and V- pin should be joined directly as
shown in the Layout Example.
10.2 Layout Example
Figure 41. X1SON Layout Example (top view)
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