LTC6945_15 datasheet(5/28 Pages) LINER

Part #	LTC6945

Description	Ultralow Noise and Spurious 0.35GHz to 6GHz Integer-N Synthesizer

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Manufacturer	LINER [Linear Technology]

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LTC6945

5

6945fa

For more information www.linear.com/LTC6945

elecTrical characTerisTics The

l

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TA = 25°C. VREF+ = VREF0+ = VD+ = VRF+ = VVCO+ = 3.3V, VCP+ = 5V unless

otherwise specified. All voltages are with respect to GND.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Phase Noise and Spurious

LM(MIN)

Output Phase Noise Floor (Note 5)

RFO[1:0] = 3, OD[2:0] = 1, fRF = 6GHz

RFO[1:0] = 3, OD[2:0] = 2, fRF = 3GHz

RFO[1:0] = 3, OD[2:0] = 3, fRF = 2GHz

RFO[1:0] = 3, OD[2:0] = 4, fRF = 1.5GHz

RFO[1:0] = 3, OD[2:0] = 5, fRF = 1.2GHz

RFO[1:0] = 3, OD[2:0] = 6, fRF = 1.0GHz

–155

–156

–157

–158

dBc/Hz

LM(NORM)

Normalized In-Band Phase Noise Floor

ICP = 11.2mA (Notes 6, 7, 8)

–226

dBc/Hz

LM(NORM –1/f) Normalized In-Band 1/f Phase Noise

ICP = 11.2mA (Notes 6, 9)

–274

dBc/Hz

LM(IB)

In-Band Phase Noise Floor

(Notes 6, 7, 8, 10)

–99

dBc/Hz

Integrated Phase Noise from 100Hz to

40MHz

(Notes 4, 7, 10)

0.13

°RMS

Spurious

Reference Spur, PLL locked (Notes 4, 7, 10, 11)

–102

dBc

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC6945I is guaranteed to meet specified performance limits

over the full operating junction temperature range of –40°C to 105°C.

Under maximum operating conditions, air flow or heat sinking may

be required to maintain a junction temperature of 105°C or lower. It is

strongly recommended that the exposed pad (Pin 29) be soldered directly

to the ground plane with an array of thermal vias as described in the

Applications Information section.

Note 3: For 0.9V ≤ VCP ≤ (VCP+ – 0.9V).

Note 4: VCO is Crystek CVCO55CL-0902-0928.

Note 5: fVCO = 6GHz, fOFFSET = 40MHz.

Note 6: Measured inside the loop bandwidth with the loop locked.

Note 7: Reference frequency supplied by Wenzel 501-04608A,

fREF = 10MHz, PREF = 13dBm.

Note 8: Output phase noise floor is calculated from normalized phase

noise floor by LM(OUT) = –226 + 10log10(fPFD) + 20log10(fRF/fPFD).

Note 9: Output 1/f phase noise is calculated from normalized 1/f phase

noise by LM(OUT –1/f) = –274 + 20log10 (fRF) – 10log10 (fOFFSET).

Note 10: ICP = 11.2mA, fPFD = 250kHz, fRF = 914MHz, FILT[1:0] = 3, Loop

BW = 7kHz.

Note 11: Measured using DC1649.

Typical perForMance characTerisTics

REF Input Sensitivity vs

Frequency

REFO Output Power vs Frequency

REFO Phase Noise

FREQUENCY (MHz)

0

–35

–30

–25

200 225

6945 G01

–40

–45

–55

50

100

150

25

250

75

125

175

–50

–15

–20

TJ = 105°C

TJ = 25°C

TJ = –40°C

BST = 1

FILT = 0

FREQUENCY (MHz)

0

1

2

200 225

6945 G02

–1

–2

–4

50

100

150

25

250

75

125

175

–3

4

3

TJ = 105°C

TJ = 25°C

TJ = –40°C

OFFSET FREQUENCY (Hz)

–155

–150

–145

–140

100

10k

100k

1M

5M

6945 G03

–160

1k

POUT = 1.45dBm

fREF = 10MHz

BST = 1

FILT = 3

NOTE 7

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