Datasheet RF2422, RF2422PCBA Datasheet (RF Micro Devices)

RF2422

5

Typical Applications

• Digital Communications Systems

• Spread-Spectrum Communication Systems

• GMSK,QPSK, DQPSK,QAM Modulation

Product Description

The RF2422 is a monolithic integrated quadrature modu­lator IC capable of universal direct modulation for high­frequency AM, PM, or compound carriers. This low-cost
IC implements differential amplifiers for the modulation
inputs, 90° carrier phase shift network, carrier limiting
amplifiers, two matched double-balanced mixers, sum­ming amplifier, and an output RF amplifier which will drive
50 Ω from 800 M Hz to 2500MHz. Component matching,
which can only be accomplished with monolithic con­struction, is used to full advantage to obtain excellent
amplitude balance and phase accuracy.

2.5GHZ DIRECT QUADRATURE MODULATOR

• GSM, DCS 1800, JDC, D-AMPS Systems

• Commercial and Consumer Systems

-A-

0.008

0.004

0.393

0.386

8° MAX

0° MIN

0.157

0.150

0.244

0.229

0.034

0.016

0.009

0.007

0.018

0.014

0.050

0.068

0.053

NOTES:

1. Shadedlead is Pin 1.

2. All dimensions are excluding
mold flash.

3. Leadcoplanarity - 0.005 with
respectto datum "A".

5

MODULATORS AND

UPCONVERTERS

Optimum Technology Matching® Applied

Si BJT GaAs MESFETGaAs HBT
Si Bi-CMOS

IREF

QREF

GND2

GND2

GND2

LO

VCC1

PD

ü

SiGe HBT

1

2

3

4

5

6

7

8

Σ

-45°
+45°

POWER

CONTROL

Si CMOS

16

15

14

13

12

11

10

9

ISIG

QSIG

GND1

GND1

GND1

VCC2

GND1

RF OUT

Functional Block Diagram

Package Style: SOIC-16

Features

• Single 5V Power Supply

• Integrated RF Quadrature Network

• No Tuning Required

• Low LO Input Level

• Digitally Controlled Power Down Mode

• 800MHz to 2500MHz Operation

Ordering Information

RF2422 2.5GHz Direct QuadratureModulator
RF2422 PCBA Fully Assembled Evaluation Board

RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro,NC 27409, USA

Tel [phone]

Fax [phone]

http://www.rfmd.com

Rev A5 010817

5-29

RF2422

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage -0.5 to +7.5 V
Input LO and RF Levels +10 dBm

Operating Ambient Temperature -40 to +85 °C
Storage Temperature -40 to +150 °C

DC

Caution! ESD sensitive device.

RF Micro Devices believesthe furnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibilityfor the use of the described p roduct(s).

5

MODULATORS AND

Parameter

Min. Typ. Max.

Carrier Input

Frequency Range 800 2500 MHz
Power Level -6 +6 dBm
Input VSWR 5:1 At 900MHz

Specification

1.8:1 At 1800 MHz

1.2:1 At 2500 MHz

Unit Condition

T=25°C, VCC=5V

Modulation Input

Frequency Range DC 250 MHz
Reference Voltage (V

Maximum Modulation (I&Q) V
Gain Asymmetry 0.2 dB

Quadrature Phase Error 3 °

UPCONVERTERS

Input Resistance 30 kΩ
Input Bias Current 40 µA

RF Output

Output Power -3 +3 dBm
Output Impedance 50 Ω
Output VSWR 3.5:1 At 900MHz

Harmonic Output -30 -35 dBc
Sideband Suppression 25 35 dB
Carrier Suppression 30 35 dB
IM

Suppression 30 35 dB Intermodulation of the carrier and the

3

Broadband Noise Floor At 20MHz offset, V

)2.03.0 V

REF

±1.0 V

REF

1.3:1 At 2000 MHz

1.15:1 At 2500MHz

25 30 dB Intermodulation of baseband signals

-145 dBm/Hz At 850MHz

-152 dBm/Hz At 19 00MH z

LO= 2GHz and -5dBm, I&Q=2.0 VPP, SSB

desired RF signal

Tied to V

Power Down

Turn On/Off Time 100 ns
PD Input Resis tance 50 kΩ
Power Control “ON” 2.8 V Threshold voltage
Power Control “OFF” 1.0 1.2 V Threshold voltage

Power Supply

Voltage 5 V Specifications

4.5 6.0 V Operating Limits

Current 45 50 mA Operating

25 µA Power Down

=5V.

CC

: ISIG, QSIG, IREF, and QREF.

REF

5-30

Rev A5 010817

RF2422

Q

Q

R

Pin Function Description Interface Schematic

1IREF

Reference voltage for the I mixer. This voltage should be the same as
the DC voltage supplied to the I SIG pin. A voltage of 3.0V is recom­mended. The SIG and REF inputs are inputs of a differential amplifier.
Therefore the REF and SIG inputs are interchangeable.If swapping the
I SIG and I REF pins, the Q SIG and Q REF also need to be swapped
to maintain the correct phase. It is also possible to drive the SIG and
REF inputs in a balanced mode. This will increase the gain.

100

Ω

425Ω425

REFQSIG

100

Ω

Ω

2QREF

Reference voltage for the Q mixer. This voltage should be the same as
the DC voltage supplied to the Q SIG pin. A voltage of 3.0V is recom­mended.

3GND2
4GND2

5GND2
6LO

Ground connection of the LO phase shift network. This pin should be
connected directly to the ground plane.

Same as pin 3.
Same as pin 3.
The input of the phase shifting network. This pin has an internal DC-

blocking capacitor. At frequencies higher than 2GHz this port is well­matched to 50Ω. This port is voltage driven so matching at lower fre­quencies is not required.

7VCC1

Power supply for all circuits except the RF output stage. An external
capacitor is needed if no other low frequency bypass c apacitor is
nearby.

8PD

Power Down control. When this pin is "low", all circuits are shut off. A
"low" is typically 1.2V or less at room temp erature.When this pin is
"high" (V

put power and performance will be degraded. Operating in this region
is not recommended, although it might be useful in some applications
where power control is required.

9RFOUT

This is the 50Ω RF Output. This pin has an internal DC-blocking capac­itor. At frequencies higher than 2GHz this po rt is well-matched. Typical
impedances at lower frequencies are: 24-j30 Ω @ 1GHz, 27-j10 Ω @

1.4GHz, 31-j3 Ω @ 1.8GHz. At those frequencies, external matching
may be needed to optimize output power.

), all circuits are operating normally. If PD is below VCC,out-

CC

REFQSIG

100

425

Ω

Ω

100

Ω

425

Ω

5

LO

V

CC

200 Ω

PD

FOUT

UPCONVERTERS

MODULATORS AND

10 GND3
11 VCC2
12 GND1
13 GND1

14 GND1
15 Q SIG

Ground connection for the RF output stage. This pin should be con­nected directly to the ground plane.

Power supply for the RF Output amplifier. An external capacitor is
needed if no other low frequency bypass capacitor is near by.

Ground connection for the LO and baseband amplifiers, and for the
mixers. This pin should be connected directly to the ground plane.

Same as pin 12.
Same as pin 12.
Baseband input to the Q mixer. This pin is D C-coupled. Maximum out-

put power is obtained when the input signal has a peak to peak ampli-

See pin 2.

tude of 2V. The recommended DC level for this pin is 3.0V. The peak
minimum voltage on this pin (V

- peak modulation amplitude)

REF

should never drop below 2.0V. The peak maximum voltage on this pin

+ peak modulation amplitude) should never exceed 4.0V.

(V

REF

Rev A5 010817

5-31

5

RF2422

Pin Function Description Interface Schematic

REF

See pin 1.

+

ISIG

C

QSIG

C

16 I SIG

Baseband input to the I mixer.This pin is DC-coupled. Maximum output
power is obtained when the input signal has a peak to peak amplitude
of 2V. The recommended DC level for this pin is 3.0V. The peak mini­mum voltage on this pin (V

- peak modulation amplitude) should

REF

never drop below 2.0V. The peak maximum voltage on this pin (V
peak modulation amplitude) should never exceed 4.0V.

Application Schematic

AC-Coupled

V

REF

C R R R R

1

2

3

16

15

14

UPCONVERTERS

MODULATORS AND

LO IN

100 nF

PD

4

5

V

CC

100 nF

6

7

8

NOTE:

The values of R and C depend on the minimum
baseband frequency (i.e., the cutoff frequency of
this high pass filter should be lower than the
lowest frequency component in the I/Q spectrum).

S

-45°

+45°

POWER

CONTROL

13

12

11

10

9

V

CC

100 nF

RF OUT

5-32

Rev A5 010817

Application Schemati c

DC-Coupled

V

REF

1

100 nF

2

RF2422

16

15

ISIG

QSIG

LO IN

PD

14

13

12

11

10

9

100 nF

V

CC

100 nF

3

4

5

6

7

8

Σ

-45°

+45°

POWER

CONTROL

Evaluation Board Schemati c

1.5” x 1.5”

(Download Bill of Materials from www.rfmd.com.)

P1

NC

1
2

GND

3

P1-1 VCC

P2

NC

1
2

GND

3

P2-1 REF

V

CC

100 nF

RF OUT

5

MODULATORS AND

UPCONVERTERS

Rev A5 010817

P2-1

J1

LO IN

P1-1

C1
100 nF

50 Ωµstrip

C2
100 nF

2422400A

1

2

3

4

5

6

7

8

Σ

-45°
+45°

POWER

CONTROL

50 Ωµstrip

16

15

50 Ωµstrip

14

13

12

11

C3

100 nF

10

9

50 Ωµstrip

J4

ISIG

J3

QSIG

P1-1

J2

RF OUT

5-33

5

RF2422

Evaluation Board Layout

Board Size 1.510” x 1.510”

Board Thickness 0.031”, Board Material FR-4

UPCONVERTERS

MODULATORS AND

5-34

Rev A5 010817