LTC6948 - Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO

The LTC®6948 is a high performance, low noise, 6.39GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, phase-frequency detector (PFD), ultralow noise charge pump, fractional feedback divider, and VCO output divider.

The fractional divider uses an advanced, 4th order ΔΣ modulator which provides exceptionally low spurious levels. This allows wide loop bandwidths, producing extremely low integrated phase noise values.

The programmable VCO output divider, with a range of 1 through 6, extends the output frequency range.

Features

Low Noise Fractional-N PLL with Integrated VCO
No Δ-Σ Modulator Spurs
18-Bit Fractional Denominator
–226 dBc/Hz Normalized In-Band Phase Noise Floor
–274 dBc/Hz Normalized In-Band 1/f Noise
–157 dBc/Hz Wideband Output Phase Noise Floor
Excellent Integer Boundary Spurious Performance
Output Divider (1 to 6, 50% Duty Cycle)
Output Buffer Muting
Reference Input Frequency Up to 425MHz
Fast Frequency Switching
FracNWizard™ Software Design Tool Support

Typical Application

Applications

Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)
Microwave Data Links
Military and Secure Radio
Test and Measurement

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC6948IUFD-1#PBF	4x5 QFN-28	I	$10.36	$7.25
LTC6948IUFD-1#TRPBF	4x5 QFN-28	I		$7.31
LTC6948IUFD-2#PBF	4x5 QFN-28	I	$10.36	$7.25
LTC6948IUFD-2#TRPBF	4x5 QFN-28	I		$7.31
LTC6948IUFD-3#PBF	4x5 QFN-28	I	$10.36	$7.25
LTC6948IUFD-3#TRPBF	4x5 QFN-28	I		$7.31
LTC6948IUFD-4#PBF	4x5 QFN-28	I	$10.36	$7.25
LTC6948IUFD-4#TRPBF	4x5 QFN-28	I		$7.31

Demo Boards


Part Number	Description	Price
DC1959A-B	LTC6948-2 Demo Board \| Ultralow Noise and Spurious 513MHz to 4.91GHz Frac-N Synthesizer with Integrated VCO, (Req DC590)	$125.00
DC1959A-C	LTC6948-3 Demo Board\| Ultralow Noise and Spurious 640MHz to 5.79GHz Frac-N Synthesizer with Integrated VCO, (Req DC590)	$125.00
DC1959B-A	LTC6948-1 Demo Board \| Ultralow Noise and Spurious 373MHz to 3.74GHz Frac-N Synthesizer with Integrated VCO, (Req DC590 or DC2026)	$125.00
DC1959B-D	LTC6948-4 Demo Board \| Ultralow Noise and Spurious 700MHz to 6.39GHz Frac-N Synthesizer with Integrated VCO, (Req DC590 or DC2026)	$125.00

**Companion Boards**
Part Number	Description	Price
DC2026C	Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform	$75.00
DC2429A	LT3042 PLL/VCO Supply and Reference Board	$150.00
DC590B	Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards	$50.00