Datasheet RF2424, RF2424PCBA Datasheet (RF Micro Devices)

ü

5-43

5

MODULATORS AND

UPCONVERTERS

Product Description

Ordering Information

Typical Applications

Features

Functional Block Diagram

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

Tel [phone]

Fax [phone]

http://www.rfmd.com

Optimum Technology Matching® Applied

Si BJT GaAs MESFETGaAs HBT
Si Bi-CMOS

SiGe HBT

Si CMOS

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

IREF

QREF

VCC1

MIXOUT

GND1

GND1

LO

GND3

ISIG

QSIG

GND1

VCC2

PD

GND1

GND2

RFOUT

Σ

POWER

CONTROL

-45°

+45°

RF2424

UHF QUADRATURE MODULATOR

• Digital Communications Systems

• Spread Spectrum Communication Systems

• GMSK,QPSK, DQPSK,QAM Modulation

• GSM and D-AMPS Systems

• AM, SSB, DSB Modulation

• Image-Reject Upconverters

The RF2424 is a monolithic integrated quadrature modu­lator IC capable of universal direct modulation for high­frequency AM, PM, or compound carriers. Maximum out­put power is +7.5dBm, which is achieved with low input I
and Q signal levels. 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 50Ω from 700M Hz to
1000 MHz.

• Single 2.7V to 5.5V Power Supply

• +7.5dBm Output Pow e r

• No Tuning Required

• Low LO Input Level

• Digitally Controlled Power Down Mode

• 700MHz to 1000MHz Operation

RF2424 UHF Quadrature Modulator
RF2424 PCBA Fully Assembled Evaluation Board

5

Rev A6 010817

0.157

0.150

0.025

0.012

0.008

0.196

0.189

0.2440

0.2284

0.0688

0.0532

0.050

0.016

0.0098

0.0075

8° MAX

0°MIN

NOTES:

1. Shaded lead is Pin 1.

2. All dimensions are excluding mold flash.

3. Lead coplanarity - 0.005 with respect to datum "A".

-A-

0.0098

0.0040

Package Style: SSOP-16

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RF2424

Rev A6 010817

5

MODULATORS AND

UPCONVERTERS

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage 5.5 V

DC

Input LO and RF Levels +6.0 dBm
Operating Ambient Temperature -40 to +85 °C
Storage Temperature -40 to +150 °C

Parameter

Specification

Unit Condition

Min. Typ. Max.

Carrier Input

T=25°C, VCC=3V

Frequency Range 700 1000 MHz
Power Level -6 +6 dBm
Input impedance 43 + j1.8 Ω At 900MHz

Modulation Input

Frequency Range DC 100 MHz
Reference Voltage (V

REF

)1.6V

Maximum Modulation (I&Q) V

REF

±0.3 V

Gain Asymmetry 0.2 dB
Quadrature P hase Error 1 °
Input DC Resistance 40 kΩ
Input B ias Current 40 µA

RF Output

VCC=3V, LO power=-3dBm, LO
freq= 900MHz, I/Q drive level=0.2V

P

,SSB

Output Power +5.0 +7.5 dBm
Output Impedance 50 Ω
Broadband Noise Fl oor -140 dBm/Hz
Sideband Suppression 25 35 dB
Carrier Suppression 25 30 dB
IM

3

Suppression 25 30 dB DSB output (+9dBm total power)

Power Down

Turn On/Off Time 100 ns
PD Input Resistance 10 kΩ
Power Down “ON” V

CC

V

Power Down “OFF” 1.0 1.2 V

Power Supply

Voltage 2.7 5.5 V
Current 45 55 mA V

CC

=3V

53 mA V

CC

=5 V

Power Down 10 µA

Caution! ESD sensitive device.

RF Micro Devices believes the 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 responsibility for the use of the described product(s).

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RF2424

Rev A6 010817

5

MODULATORS AND

UPCONVERTERS

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 o f 1.6V 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. If single ended operation is desired
then the input is applied to I SIG, pin 16. In that case, I REF and Q REF
are tied together and AC coupled to ground. To obtain a carrier sup­pression of better than 40 dB, I REF may be tuned ±20mV relative to
the I SIG. Without tuning, it will typically be bette r than 25dB.

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 1.6V is recom­mended. The SIG and REF inputs are inputs of a differential amplifier.
Therefore the REF and SIG inputs are interchangeable.If swapping the
Q SIG and Q REF pins, the I SIG and I 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. If single ended operation is desired
then the input is applied to Q SIG, pin 15. In that case, Q REF and Q
REF are tied together and AC coupled to ground. Toobtain a carrier
suppression of better than 40dB, Q REF may be tuned ±20mV relative
to th e Q SIG. Without tu ning, it will typically b e better than 25dB.

3VCC1

Power supply for the I mixer, Q mixer and the RF Output amplifier.

4 MIX OUT

MIXOUT: Combined output of the I mixer and Q mixer. By changing the
inductor value, maximum RF output is tuned to d ifferent frequ ency. If
the inductor value is changed, the RF output match needs to be
adjusted for 50Ω output impedance.

5GND1

Ground connection for the LO and baseband amplifiers and mixers.

6GND1

Same as pin 5.

7LOIN

The input of the phase shifting network.

8GND3

Ground connection for the LO phase shi ft network.

9RFOUT

RF Output. An external LC matching network is needed for a 50Ω
match.

10 GND2

Ground connection for the RF output stage.

11 GND1

Same as pin 5.

12 PD

Power Down control. When this pin is “low”, all circuits are shut off.

13 VCC2

Power supply for all circuits except mixers and output amplifier.

14 GND1

Same as pin 5.

15 Q SIG

Baseband input to the Q mixer. Maximum output power is obtained
when the input signal has a peak to peak amplitude of 400mV. The DC
level for this pin is 1.6V, same as QREF.

See pin 2.

16 I SIG

Baseband input to the Q mixer. Maximum output power is obtained
when the input signal has a peak to peak amplitude of 400mV. The DC
level for this pin is 1.6V, same as QREF.

See pin 1.

Q

REFQSIG

BIAS BIAS

Q

REFQSIG

BIAS BIAS

M

IX OUT

LO

BIAS

R

FOUT

PD

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RF2424

Rev A6 010817

5

MODULATORS AND

UPCONVERTERS

Applicatio n Schematic

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

C

Vcc

1nF

1nF

PD

LO IN

V

REF

ISIG

RF OUT

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

QSIG

R

Σ

POWER

CONTROL

-45°

+45°

Vcc

1nF

R R R

C

C

L

1nF

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RF2424

Rev A6 010817

5

MODULATORS AND

UPCONVERTERS

Evaluation Board Schematic

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

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Σ

POWER

CONTROL

-45°
+45°

L1

10 nH

50 Ωµstrip

LO IN

J3

L3

8.2 nH

C3

1nF

VREF
P2-1

VCC
P1-1

C1

1nF

C8

33 nF

C6

1nF

PD
P2-3

VCC
P1-1

R2

100 Ω

C9

100 pF

50 Ωµstrip

R3

100 Ω

50 Ωµstrip

C10

100 pF

QSIG

J2

ISIG

J1

C7

1nF

50 Ωµstrip

RF OUT

J4

C4

4pF

L2

6.8 nH
VCC

P1-1

C5

1nF

P1-1

P1

GND

GND

VCC

1
2
3

P2-1

P2-3

P2

PD

GND

VREF

1
2
3

Drawing 2424400 Rev -

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RF2424

Rev A6 010817

5

MODULATORS AND

UPCONVERTERS

Evaluation Board Layout

2” x 2”