Si4x55-C

Rev 1.0

7

Table 4. Transmitter AC Electrical Characteristics1

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

TX Frequency Range

284

—

350

MHz

350

—

525

MHz

850

—

960

MHz

(G)FSK Data Rate

1.0

—

500

kbps

OOK Data Rate

0.5

—

120

kbps

Modulation Deviation

Range

850–960 MHz

—

—

500

kHz

350–525 MHz

—

—

500

kHz

284–350 MHz

—

—

500

kHz

Modulation Deviation

Resolution

850–1050 MHz

—114.4

—

Hz

420–525 MHz

—57.2

—

Hz

350–420 MHz

—45.6

—

Hz

284–350 MHz

—38.1

—

Hz

Output Power Range3

Measured at 434 MHz, 3.3 V,

Class E match

–20

—

+13

dBm

TX RF Output Steps3

Using switched current match within

6 dB of max power

—0.25

—

dB

TX RF Output Level3

Variation vs. Temperature

–40 to +85

C—

2.3

—

dB

TX RF Output Level

Variation vs. Frequency3

Measured across 902–928 MHz

—

0.6

—

dB

Transmit Modulation

Filtering

B*T

Gaussian Filtering Bandwith Time

Product

—0.5

—

Notes:

1.

All minimum and maximum values are guaranteed across the recommended operating conditions of supply voltage and

from –40 to +85 °C unless otherwise stated. All typical values apply at VDD = 3.3 V and 25 °C unless otherwise stated.

2.

The maximum data rate is dependent on the XTAL frequency and is calculated as per the formula: Maximum Symbol

Rate = Fxtal/60, where Fxtal is the XTAL frequency (typically 30 MHz).

3.

Conducted measurements based on RF evaluation board. Output power and emissions specifications are dependent on

transmit frequency, matching components, and board layout.