200mW Single-Chip Transmitter ICs for

868MHz/915MHz ISM Bands

4

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AC ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

-3

σ

TYP

+3

σ

MAX

UNITS

ANALOG INPUT PINS

VTUNE Input Capacitance

VTUNE = +1.35V

15

pF

DIGITAL INPUT PINS

Digital Input Pin Capacitance

3

pF

VCO AND SYNTHESIZERS SECTION

(MAX2900/MAX2901/MAX2902)

902

917.28

928

RFOUT Frequency Range

(MAX2903/MAX2904)

867

868

870

MHz

(MAX2900/MAX2901/MAX2902)

14

14.56

15

REFIN Reference Frequency

Range

(MAX2903/MAX2904)

13

13.78

14.5

MHz

REFDIV Fixed Reference Divider

Ratio

(MAX2900)

4

4

4

Table 4 (MAX2900)

249

256

Main Divider Ratios

(MAX2901/MAX2903)

62

63

(MAX2900)

3.5

3.64

3.75

PLL Comparison Frequency

(MAX2901/MAX2903)

13

15

MHz

VCO Buffer Output Power

300

Ω differential load (MAX2901–MAX2904)

-12

dBm

REFDIV Fixed Reference

Divider Ratio

(MAX2901/MAX2903)

1

1

1

VCO Phase Noise

At 100kHz offset, measured at RFOUT,

PLL loop BW = 5kHz

-101

dBc/Hz

(MAX2900/MAX2901/MAX2902)

44

65

86

VCO Tuning Gain

(MAX2903/MAX2904)

85

MHz/V

5

kHz RMS

VCO Frequency Pulling with

OOK Modulation

OOKIN clocked at 19kHz, internal (crystal)

or external reference frequency

60

kHz peak

PLL Phase Noise

Measured at RFOUT, 5kHz offset,

PLL loop BW = 50kHz

-96

dBc/Hz

REFOUT Voltage Swing

100

mVp-p

CPOUT Charge Pump Current

500

µA

Reference Spurs

-62

dBc

Reference Input Voltage for

Nominal Operation

Using an external frequency reference

200

300

mV

BPSK, OOK MODULATOR, AND PA

MODIN Frequency Range

1.2

8

Mb/s

Modulation Filter Nominal 3dB

Bandwidth

1

MHz

Modulation Filter Final Attenuation Measured at 30MHz

28

41

dB

Carrier Suppression

28

dB

Noise Power Density

At 960MHz (measured at RFOUT at

+23dBm output power)

-150

dBc/Hz