LTC6948 datasheet(3/38 Pages) AD

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LTC6948

6948fa

For more information www.linear.com/LTC6948

elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference Inputs (REF+, REF–)

fREF

Input Frequency

425

MHz

VREF

Input Signal Level

Single-Ended, 1µF AC-Coupling Capacitors

0.5

2.7

VP-P

Input Slew Rate

V/µs

Input Duty Cycle

Self-Bias Voltage

1.65

1.85

2.25

Input Resistance

Differential

5.8

8.4

11.6

kΩ

Input Capacitance

Differential

VCO

fVCO

Frequency Range

LTC6948-1 (Note 3)

LTC6948-2 (Note 3)

LTC6948-3 (Note 3)

LTC6948-4 (Note 3)

2.24

3.08

3.84

4.20

3.74

4.91

5.79

6.39

GHz

KVCO

Tuning Sensitivity

LTC6948-1 (Notes 3, 4)

LTC6948-2 (Notes 3, 4)

LTC6948-3 (Notes 3, 4)

LTC6948-4 (Notes 3, 4)

4.7 to 7.2

4.7 to 7.0

4.0 to 6.0

4.5 to 6.5

%Hz/V

RF Output (RF+, RF–)

fRF

Output Frequency

0.373

6.39

GHz

Output Divider Range

All Integers Included

Output Duty Cycle

Output Resistance

Single-Ended, Each Output to VRF+

100

136

175

PRF-SE

Output Power, Single-Ended, fRF = 900MHz RFO[1:0] = 0, RZ = 50Ω, LC Match

RFO[1:0] = 1, RZ = 50Ω, LC Match

RFO[1:0] = 2, RZ = 50Ω, LC Match

RFO[1:0] = 3, RZ = 50Ω, LC Match

–9

–6.1

–2.9

0.1

–7.3

–4.5

–1.4

1.5

–5.5

–2.8

0.2

dBm

Output Power, Muted, fRF = 900MHz

RZ = 50Ω, Single-Ended, O = 2 to 6

–80

dBm

Mute Enable Time

110

Mute Disable Time

170

Phase/Frequency Detector

fPFD

Input Frequency

Integer mode

Fractional mode

LDOEN = 0

LDOV = 3, LDOEN = 1

LDOV = 2, LDOEN = 1

LDOV = 1, LDOEN = 1

LDOV = 0, LDOEN = 1

100

76.1

66.3

56.1

45.9

34.3

MHz

Charge Pump

ICP

Output Current Range

8 Settings (See Table 6)

11.2

Output Current Source/Sink Accuracy

All Settings, V(CP) = VCP+/2

±6

Output Current Source/Sink Matching

ICP = 1.0mA to 2.8mA, V(CP) = VCP+/2

ICP = 4.0mA to 11.2mA, V(CP) = VCP+/2

±3.5

±2

Output Current vs Output Voltage Sensitivity (Note 5)

0.2

%/V

Output Current vs Temperature

V(CP) = VCP+/2

170

ppm/°C

Output Hi-Z Leakage Current

ICP = 11.2mA, CPCLO = CPCHI = 0 (Note 5)

0.03

The l denotes the specifications which apply over the full operating

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

specified (Note 2). All voltages are with respect to GND.

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