RF2850PCBA-41X - RF Micro Devices

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Optimum Technology Matching® Applied

GaAs HBT

InGaP HBT

GaAs MESFET

SiGe BiCMOS

Si BiCMOS

SiGe HBT

GaAs pHEMT

Si CMOS

Si BJT

GaN HEMT

Functional Block Diagram

RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-

mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.

Product Description

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Ordering Information

VCC

QSIG

QREF

GND

VCC

GND

RFOUT

GND

VCC

GND

LOREF

RFREFGND

ISIG

IREF

1516

-45°

+45° Σ

RF2850

DIRECT QUADRATURE MODULATOR

The RF2850 is a direct quadrature modulator for use in base stations and

other communications systems. RF2850 supports PCS, GSM, EDGE,

CDMA2000, and UMTS standards. This device features a narrow-band

operation at 1700MHz to 2500MHz with excellent carrier and sideband

suppression and ultra low noise floor. The device is manufactured on an

advanced GaAs HBT process. The RF2850 operates from a single 5V sup-

ply and is packaged in a low cost 4mmx4mm 16-pin leadless package.

Features

Typical Carrier

Suppression>40dBc

Typical Sideband

Suppression>40dBc

Noise Floor better than -

158dBm/Hz

Single 5V Power Supply

Applications

UMTS Base Stations

CDMA Base Stations

GSM-EDGE/EGSM Base Sta-

tions

WLAN and WLL Systems

GMSK,QPSK,DQPSK,QAM

Modulation

RF2850Direct Quadrature Modulator

RF2850 Direct Quadrature Modulator

RF2850PCBA-41X Fully Assembled Evaluation Board

Rev A0 DS050616

RoHS Compliant & Pb-Free Product

Package Style: QFN, 16-Pin, 4x4

2 of 8

RF2850

Rev A0 DS050616

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage -0.5 to +5.3 V

LO Input +10 dBm

Operating Temperature -40 to +85 °C

Storage Temperature -65 to +150 °C

Parameter Specification Unit Condition

Min. Typ. Max.

High Band Performance (1900MHz) with CW Baseband Inputs

LO Input Port

LO Drive Level -5 dBm

LO Input Impedance 50 Ω

LO Port Return Loss 13 dB

Modulation Input

Frequency Range DC 250 MHz

Reference Voltage 2.05 V Baseband common mode voltage

Baseband Input Level 0.25 VP-P 0.25VP-P per pin, 500mV VP-P differential, I/Q

in quadrature

I/Q Signal 200 kHz CW baseband signal

Input Impedance 40 kΩMeasured at DC

Bandwidth (-1dB) 130 MHz 500mV VP-P differential, I/Q at 2.05V DC

Input Bias Current 40 μA

I/Q Modulator Output

RF Frequency Range 1700 2500 MHz T=25°C, VCC=5V

RF Output Power -6 dBm

RF Output Return Loss 15 dB

RF Output P1dB 4 5 dBm

Carrier Suppression 20 25 dBc Unadjusted (see note)

Carrier Suppression 35 55 dBc Adjusted. T=-40°C to +85°C

Sideband Suppression 30 45 dBc Unadjusted

IM3 Suppression 52 dBc Two tone baseband input @ 500mVP-P differen-

tial per tone

Output IP3 15 20 dBm

Broadband Noise Floor -158 -156 dBm/Hz 20MHz offset from LO, all IQ input at bias of

2.05V

DC Parameters

Supply Voltage 5.0 V Specification

4.75 5.25 V Operating limits

Supply Current 60 mA

Note: 20dBc limit for unadjusted carrier suppression is applicable for differential I and Q inputs only.

Caution! ESD sensitive device.

Exceeding any one or a combination of the Absolute Maximum Rating conditions may

cause permanent damage to the device. Extended application of Absolute Maximum

Rating conditions to the device may reduce device reliability. Specified typical perfor-

mance or functional operation of the device under Absolute Maximum Rating condi-

tions is not implied.

RoHS status based on EUDirective2002/95/EC (at time of this document revision).

The information in this publication is believed to be accurate and reliable. However, no

responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any

infringement of patents, or other rights of third parties, resulting from its use. No

license is granted by implication or otherwise under any patent or patent rights of

RFMD. RFMD reserves the right to change component circuitry, recommended appli-

cation circuitry and specifications at any time without prior notice.

3 of 8

RF2850

Rev A0 DS050616

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Parameter Specification Unit Condition

Min. Typ. Max.

High Band Performance with PCS CDMA and W-CDMA Baseband Inputs

W-CDMA 3GPP

Channel Power -13 dBm 3.84MHz integrated bandwidth, ESG-D with

LPF

ACPR @ 1960MHz -68 -62 dBc

SNR @ 1960MHz -74 -70 dBc

ACPR @ 2140MHz -65 -62 dBc

SNR @ 2140MHz -74 -70 dBc

Noise Floor @ 20MHz Offset -156 -155 dBm/Hz 20MHz offset from LO

PCS CDMA

Channel Power -13 dBm 1.2288MHz integrated bandwidth

ACPR @ 1960MHz -72 -70 dBc 30kHz integrated bandwidth

W-CDMA 1MHz BW

Channel Power -14 dBm 1MHz integrated bandwidth at adjacent chan-

nel

ACPR @ 2140MHz -74 -71 dBc

SNR @ 2140MHz -85 -82 dBc

Noise Floor @ 20MHz Offset -157 -156 dBm/Hz 20MHz offset from LO

4 of 8

RF2850

Rev A0 DS050616

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Pin Function Description Interface Schematic

1GND

Ground connection.

2LO

LO input signal. This pin has an internal DC-blocking capacitor. This port is

voltage-driven so matching at different frequencies is generally not

required.

3LOREF

The reference end of local oscillator.

4GND

Ground connection.

5VCC

Power supply. An external capacitor is required.

6I REF

Reference voltage for the I mixer. The DC voltage should be the same as

the DC supplied to I SIG (pin 7). See pin 7 for more information.

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 differential

mode which will increase gain.

7I SIG

Baseband input to the I mixer. This pin is DC-coupled. The input drive level

determines output power and linearity performance. For better

carrier/sideband suppression and dynamic range, the drive level should

be as high as possible to meet the required linearity performance. The rec-

ommended DC level for this pin is 2.05V.

8GND

Ground connection.

9RFREF

The reference end of RF input.

10 VCC Power supply. An external capacitor is required.

11 GND Ground connection.

12 RF OUT RF Output. This pin has an internal DC-blocking capacitor. At some frequen-

cies, external matching may be needed to optimize output power.

13 GND Ground connection.

14 Q SIG Baseband input to the Q mixer. This pin is DC-coupled. The input drive level

determines the output power and linearity performance. For better

carrier/sideband suppression and dynamic range, the drive level should

be as high as possible to meet the required linearity performance. The rec-

ommended DC level for this pin is 2.05V.

15 Q REF Reference voltage for the Q mixer. See pin 14 for more information.

16 VCC Power supply. An external capacitor is required.

Pkg

Base

GND Ground connection.

2 pF

VCC

2 pF

VCC

RF OUT

2 pF

VCC

2 pF

VCC

5 of 8

RF2850

Rev A0 DS050616

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Package Drawing

0.10 CABM

0.35

0.23

Pin 1 ID

0.20 R

2.25

1.95 SQ.

0.65

0.75

0.50 TYP

0.60

0.24

TYP

0.05 C

0.90

0.85

0.70

0.65 0.05

0.00

12°

MAX

-C- SEATING

PLANE

Shaded lead is pin 1.

Dimensions in mm.

0.10 C A

2 PLCS

-A-

4.00 SQ.

0.10 C B

2 PLCS

0.10 C B

2 PLCS

-B-

3.75 SQ

1.87 TYP

0.10 C A

2 PLCS

2.00 TYP

6 of 8

RF2850

Rev A0 DS050616

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Evaluation Board Schematic

1700MHz to 2500MHz (Differential Drive)

VIN

VCC VCC2

VCC1

100 pF

C10

100 pF

C14

0.5 pF

-45°

+45°

7 86

1516

QREF

50 Ω μstrip J4

QSIG

50 Ω μstrip

IREF

50 Ω μstrip J5

ISIG

50 Ω μstrip

1 nH

50 Ω μstrip

C12

3.9 pF

C13

3.9 pF

2.1 GHz X2

2.1 GHz

50 Ω μstrip J6

RF OUT

VCC1

100 nH

VCC2

100 nH

100 pF

2.2 pF

7 of 8

RF2850

Rev A0 DS050616

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Evaluation Board Layout

Board Size 2.00” x 2.00”

Board Thickness 0.042” (±10%), Board Material FR-4

8 of 8

RF2850

Rev A0 DS050616

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.