A d v a nce d I n fo rm a t i o n

Eterna Datasheet

Linear Technology / Dust Networks

15

63

TIMEn

1*

I

-

Time capture request, active low

* Input signals that must be driven or pulled to a valid state to avoid leakage.

5.3

Power Supply

Eterna is powered from a single pin, VSUPPLY, and generates all required supplies internally. With two integrated DC/DC

converters and four voltage regulators, the sensitivity to noise on VSUPPLY is minimal. However, during typical operation

Eterna will vary its load on the power supply from the

μA range to 10’s of mA over a few μs. During such transients, the

power supply must meet the specifications for supply noise tolerance. Eterna is designed to operate with specific decoupling

capacitance on VCORE, VDDA, VOSC, VDDPA, and VPRIME, as well as the internal converter capacitors C1 through C4.

Failure to use correctly sized ceramic capacitors can result in supply instability and performance degradation.

5.3.1

Antenna

Eterna allows direct connection to a single-ended 50-Ohm antenna; an internal TX/RX switch simplifies external circuitry

requirements. Because both the transmit and the receive paths are single-ended, a balun (with its associated cost and

efficiency loss) are not required. Eterna provides options to set typical output power to 0 dBm or to +8 dBm using the on-chip

PA. For further details on radio transmit and receive, see section 2.4.

5.5

JTAG

Eterna includes an IEEE 1149.1-compliant JTAG port for boundary scan.

6.0

Absolute Maximum Ratings

The absolute maximum ratings shown in Table 3 should not be violated under any circumstances. Permanent damage to the

device may be caused by exceeding one or more of these parameters. Unless otherwise noted, all voltages in Table 3 are

relative to GND.

Table 3

Absolute Maximum Ratings

Parameter

Min

Typ

Max

Units

Comments

Supply voltage (VSUPPLY to GND)

–0.3

3.76

V

Voltage on any digital I/O pin

–0.3

VSUPPLY

+ 0.3

up to 3.76

V

Input RF level

+10

dBm

Input power at antenna connector

Storage temperature range

–55

+105

°C

Extended storage at high

temperature is discouraged, as this

negatively affects the data

retention of Eterna’s calibration

data.

Lead temperature

+245

°C

For 10 seconds

VSWR of antenna

3:1

ESD protection

Antenna pad

±8000

V

HBM

All other pads

±1000

V

HBM

±100

V

CDM

Caution! ESD sensitive device. Precaution should be used when handling the device in order to prevent

permanent damage.