LTC6948 datasheet(6/38 Pages) AD

6 / 38 page

LTC6948

6948fa

For more information www.linear.com/LTC6948

TA = 25°C. VREF+ = VD+ = VRF+ = 3.3V, VCP+ = VVCO+ =

5V, INTN = 0, DITHEN = 1, CPLE = 1, RFO[1:0] = 3, unless otherwise noted.

Typical perForMance characTerisTics

elecTrical characTerisTics

Note 3: Valid for 1.60V ≤ V(TUNE) ≤ 2.85V with part calibrated after a

power cycle or software power-on reset (POR).

Note 4: Based on characterization.

Note 5: For 0.9V < V(CP) < (VCP+ – 0.9V).

Note 6: Measured outside the loop bandwidth, using a narrowband loop,

RFO[1:0] = 3.

Note 7: Measured inside the loop bandwidth with the loop locked.

Note 8: Reference frequency supplied by Wenzel 501-04516,

fREF = 100MHz, PREF = 10dBm.

Note 9: Reference frequency supplied by Wenzel 500-23571,

fREF = 61.44MHz, PREF = 10dBm.

Note 10: Output phase noise floor is calculated from normalized phase

noise floor by LOUT = LNORM + 10log10 (fPFD) + 20log10 (fRF/fPFD).

Note 11: Output 1/f noise is calculated from normalized 1/f phase noise by

LOUT(1/f) = L1/f + 20log10 (fRF) – 10log10 (fOFFSET).

Note 12: ICP = 5.6mA, fPFD = 61.44MHz, FILT[1:0] = 0, Loop BW = 180kHz;

fRF = 2377.7MHz, fVCO = 4755.4MHz (LTC6948-3)

Note 13: ICP = 5.6mA, fPFD = 25MHz, FILT[1:0] = 0, Loop BW = 73kHz;

fRF = 891.85MHz, fVCO = 2675Hz (LTC6948-1), fVCO = 4459MHz

(LTC6948-2), fVCO = 5351MHz (LTC6948-3, LTC6948-4).

Note 14: Measured using DC1959.

Charge Pump Sink Current Error

vs Voltage, Output Current

REF Input Sensitivity vs

Frequency

Charge Pump Sink Current Error

vs Voltage, Temperature

CP Hi-Z Current vs Voltage,

Temperature

Charge Pump Source Current

Error vs Voltage, Output Current

TUNE Current vs Voltage,

Temperature

FREQUENCY (MHz)

–15

–20

–25

–30

–35

–40

–45

–50

400

6948 G01

100

200

300

450

350

150

250

BST = 1

FILT = 0

105°C

25°C

–40°C

OUTPUT VOLTAGE (V)

–1

–2

–3

–5

–4

4.0

6948 G02

1.0

2.0

3.0

5.0

3.5

0.5

1.5

2.5

4.5

ICP = 11.2mA

CPRST = 1

CPLE = 0

105°C

25°C

–40°C

VOLTAGE (V)

–1

–2

–3

–5

–4

6948 G03

1.0

2.0

3.0

0.5

1.5

2.5

105°C

25°C

–40°C

OUTPUT VOLTAGE (V)

–1

–2

–3

–5

–4

4.0

6948 G04

1.0

2.0

3.0

5.0

3.5

0.5

1.5

2.5

4.5

CPLE = 0

1mA

5.6mA

11.2mA

OUTPUT VOLTAGE (V)

–1

–2

–3

–5

–4

4.0

6948 G05

1.0

2.0

3.0

5.0

3.5

0.5

1.5

2.5

4.5

ICP = 11.2mA

CPLE = 0

105°C

25°C

–40°C

OUTPUT VOLTAGE (V)

–1

–2

–3

–5

–4

4.0

6948 G06

1.0

2.0

3.0

5.0

3.5

0.5

1.5

2.5

4.5

CPLE = 0

1mA

5.6mA

11.2mA

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