400 MHz to 1250 MHz Quadrature Modulator with

750 MHz to 1150 MHz Frac-N PLL and Integrated VCO

Data Sheet

ADRF6701

Rev. 0

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FEATURES

IQ modulator with integrated fractional-N PLL

Output frequency range: 400 MHz to 1250 MHz

Internal LO frequency range: 750 MHz to 1150 MHz

Output P1dB: 10.3 dBm @ 1100 MHz

Output IP3: 30.1 dBm @ 1100 MHz

Noise floor: −159.4 dBm/Hz @ 1100 MHz

Baseband bandwidth: 750 MHz (3 dB)

SPI serial interface for PLL programming

Integrated LDOs and LO buffer

Power supply: 5 V/240 mA

40-lead 6 mm × 6 mm LFCSP

APPLICATIONS

Cellular communications systems

GSM/EDGE, CDMA2000, W-CDMA, TD-SCDMA, LTE

Broadband wireless access systems

Satellite modems

GENERAL DESCRIPTION

The ADRF6701 provides a quadrature modulator and

synthesizer solution within a small 6 mm × 6 mm footprint

while requiring minimal external components.

The ADRF6701 is designed for RF outputs from 400 MHz to

1250 MHz. The low phase noise VCO and high performance

quadrature modulator make the ADRF6701 suitable for next

generation communication systems requiring high signal

dynamic range and linearity. The integration of the IQ

modulator, PLL, and VCO provides for significant board

savings and reduces the BOM and design complexity.

input to the IQ modulator. The phase detector together with an

external loop filter is used to control the VCO output. The VCO

output is applied to a quadrature divider. To reduce spurious

components, a sigma-delta (Σ-Δ) modulator controls the

programmable PLL divider.

The IQ modulator has wideband differential I and Q inputs,

which support baseband as well as complex IF architectures.

The single-ended modulator output is designed to drive a

50 Ω load impedance and can be disabled.

The ADRF6701 is fabricated using an advanced silicon-

germanium BiCMOS process. It is available in a 40-lead,

exposed-paddle, Pb-free, 6 mm × 6 mm LFCSP package.

Performance is specified from −40°C to +85°C. A lead-free

evaluation board is available.

Table 1.

Part No.

Internal LO Range

IQ Modulator

±3 dB RF Output Range

ADRF6701

750 MHz

400 MHz

1150 MHz

1250 MHz

ADRF6702

1550 MHz

1200 MHz

2150 MHz

2400 MHz

ADRF6703

2100 MHz

1550 MHz

2600 MHz

2650 MHz

FUNCTIONAL BLOCK DIAGRAM

MUX

RSET

CP VTUNE

LOSEL

LON

LOP

QN

2:1

MUX

VCO

CORE

QP

TEMP

SENSOR

DECL3

DECL2

DECL1

ENOP

BUFFER

BUFFER

RFOUT

NC

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

VCC1

VCC2

VCC3

VCC4

VCC5

VCC6

–

+

CHARGE PUMP

250µA,

500µA (DEFAULT),

750µA,

1000µA

PRESCALER

÷2

LE

CLK

SPI

INTERFACE

DATA

MUXOUT

÷2

0/90

REFIN

GND

ADRF6701

29

VCC7

34

26

16

39

3

5

4

8

6

14

13

12

38

37

36

7

11 15 20 21 23

24

25 28 30 31 35

2

9

40

IP

IN

27

17

10

1

22

PHASE

FREQUENCY

DETECTOR

THIRD-ORDER

FRACTIONAL

INTERPOLATOR

FRACTION

REG

MODULUS INTEGER

REG

N COUNTER

21 TO 123

×2

÷2

÷4

DIVIDER

÷2

DIVIDER

÷2

18

19

32

33

Figure 1.