SI4012-C1001AT datasheet(5/50 Pages) SILABS

Part #	SI4012-C1001AT

Description	Si4012 CRYSTAL-LESS FSK/OOK RF TRANSMITTER

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Manufacturer	SILABS [Silicon Laboratories]

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Si4012

Rev 1.1

5

Table 3. Si4012 RF Transmitter Characteristics1

(TA = 25 °C, VDD = 3.3 V, RL = 550

, unless otherwise noted)

Parameter

Test Condition

Min

Typ

Max

Unit

Frequency Range (FRF)2

27

—

960

MHz

Frequency Noise (rms)3

Allen deviation, measured across

1ms interval

—0.3

—

ppm

Phase Noise @ 915 MHz

10 kHz offset

—

–70

—

dBc/Hz

100 kHz offset

—

–100

—

dBc/Hz

1 MHz offset

—

–105

—

dBc/Hz

Frequency Tuning Time

—

5

—

ms

Carrier Frequency Accuracy

0 °C ≤ TA ≤ 70 °C

–150

+150

ppm

–40 °C ≤ TA ≤ 85 °C

–250

+250

ppm

Frequency Error Contribution

with External Crystal

–10

—

+10

ppm

Transmit Power4

Maximum programmed Tx power,

with optimum differential load, VDD

> 2.2 V

—

10

—

dBm

Minimum programmed TX power,

with optimum differential load,

VDD > 2.2 V

—

–13

—

dBm

Power variation vs temp and supply,

with optimum differential load,

VDD >2.2 V

–1.0

—

0.5

dB

Power variation vs temp and supply,

with optimum differential load,

VDD >1.8 V

–2.5

—

0.5

dB

Transmit power step size

from –13 to 6.5 dBm

—0.25

—

dB

PA Edge Ramp Rate

Programmable Range

OOK mode

0.34

—

10.7

us

Data Rate

OOK

0.1

—

50

kbaud

FSK

0.1

—

100

kbaud

FSK Deviation

Max frequency deviation

—

275

—

ppm

Deviation resolution

—

2

—

ppm

Deviation accuracy

±(4 ppm + 2% pk-pk target FSK

deviation in ppm)

ppm

OOK Modulation Depth

60

—

dB

Antenna Tuning Capacitive

Range (Differential)

315 MHz

2.4

—

12.5

pF

Notes:

1.

All specifications guaranteed by production test unless otherwise noted. Production test conditions and max limits are

listed in "1.1. Definition of Test Conditions" on page 7.

2.

The frequency range is continuous over the specified range.

3.

The frequency step size is limited by the frequency noise.

4.

Optimum differential load is equal to 4 V/(11.5 mA/2 x 4/PI) = 550

Therefore the antenna load resistance in parallel

with the Si4012 differential output resistance should equal 600



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