SKY12407-321LF - Skyworks Solutions

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

200935D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 16, 2010 1

DATA SHEET

SKY12407-321LF: 50-600 MHz, 12 dB 100 Ω Differential

Digital Attenuator

Applications

 Cellular/3G infrastructure

 IF/RF systems

Features

 Dual, positive voltage operation: 0/1.8-5.0 V

 High bit accuracy: ±0.3 dB @ 200 MHz

 Low insertion loss: 0.3 dB @ 200 MHz

 Absorptive in 100 Ω differential systems

 Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 C per

JEDEC J-STD-020)

RFIP

RFIN

RFOP

RFON

VCTL1 VCTL2

Figure 1. SKY12407-321LF Block Diagram

Description

The SKY12407-321LF is a GaAs pHEMT two-bit attenuator I/C.

The device is provided in a 3 x 3 mm 12-pin Quad Flat No-Lead

(QFN) package.

The SKY12407-321LF is particularly suited for 100 Ω differential

systems for which high attenuation accuracy, low insertion loss,

and low intermodulation products are required.

The attenuator’s differential input and output impedance is

100 Ω. The device is controlled by two positive DC voltage control

pins. The differential attenuator paths are controlled together and

can be in either an insertion loss or a 12 dB attenuation state. In a

differential system, the attenuator presents a 100 Ω impedance,

but can be used as two single-ended attenuators, each with a

50 Ω impedance.

A functional block diagram is shown in Figure 1. The pin

configuration and package are shown in Figure 2. Signal pin

assignments and functional pin descriptions are provided in

Table 1.

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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456

12 11 10

RFIP

CBYPASS1

RFIN

GND

VCTL1

GND

VCTL2

RFOP

CBYPASS2

RFON

Figure 2. SKY12407-321LF Pinout – 12-Pin QFN

(Top View)

Table 1. SKY12407-321LF Signal Descriptions

Pin # Name Description Pin # Name Description

1 RFIP Positive RF input. Comprises J1 along with

pin 3. Must be DC blocked from external

circuit.

7 RFON Negative RF output. Comprises J2 along

with pin 9. Must be DC blocked from

external circuit.

2 CBYPASS1 Must be AC-coupled to external circuit

ground.

8 CBYPASS2 Must be AC-coupled to external circuit

ground.

3 RFIN Negative RF input. Comprises J1 along with

pin 1. Must be DC blocked from external

circuit.

9 RFOP Positive RF output. Comprises J2 along with

pin 7. Must be DC blocked from external

circuit.

4 GND Ground 10 VCTL2 Control voltage input.

5 GND Ground 11 GND Ground

6 GND Ground 12 VCTL1 Control voltage input.

Note: Exposed pad must be grounded.

Table 2. SKY12407-321LF Absolute Maximum Ratings

Parameter Symbol Minimum Typical Maximum Units

RF input power @ 5 V PIN +32 dBm

Control voltage VCTL 6 V

Operating temperature TOP –40 +85 C

Storage temperature TSTG –65 +150 C

Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other

parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.

CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device

must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body

or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.

Electrical and Mechanical Specifications

The absolute maximum ratings of the SKY12407-321LF are

provided in Table 2. Electrical specifications are provided in

Table 3.

Typical performance characteristics of the SKY12407-321LF are

illustrated in Figures 3 through 6.

The state of the SKY12407-321LF is determined by the logic

provided in Table 4.

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

200935D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 16, 2010 3

Table 3. SKY12407-321LF Electrical Specifications (Note 1)

(VCTL = 0 to 3 V, TOP = +25 C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω (Single Ended), Unless Otherwise Noted)

Parameter Symbol Test Condition Min Typical Max Units

Insertion loss IL f = 50 to 600 MHz 0.30 0.40 dB

Attenuation Attn f = 50 to 400 MHz

f = 400 to 600 MHz

11.7

11.5

12.0

12.3

Return loss, insertion loss state RL_IL f = 50 to 600 MHz 25 dB

Return loss, attenuation state RL_AT f = 50 to 600 MHz 20 dB

Switching speed, on TON 50% control to 90% RF 37 ns

Switching speed, off TOFF 50% control to 10% RF 37 ns

Switching speed, rise TRISE 10/90% RF 40 ns

Switching speed, fall TFALL 90/10% RF 40 ns

Input power for 1 dB compression P1dB f = 50 MHz, insertion loss

state

f = 100 MHz, insertion

loss state

+28

+31

dBm

Input power for 0.5 dB compression P0.5dB f = 50 MHz, attenuation

state

f = 100 MHz, attenuation

state

+27

+31

dBm

3rd Order Input Intercept Point IIP3 f = 50 MHz, insertion loss

state, PIN = +6 dBm

f = 50 MHz, attenuation

state, PIN = +18 dBm

+48

dBm

2nd harmonic 2fo f = 50 MHz, insertion loss

state, PIN = +6 dBm

f = 50 MHz, attenuation

state, PIN = +18 dBm

+75

+60

dBc

3rd harmonic 3fo f = 50 MHz, insertion loss

state, PIN = +6 dBm

f = 50 MHz, attenuation

state, PIN = +18 dBm

+85

+70

dBc

Balanced 2nd harmonic 2fo_BAL f = 50 MHz, insertion loss

state, PIN = +6 dBm

f = 50 MHz, attenuation

state, PIN = +18 dBm

+85

dBc

Control current ICTL VCTL = 3 V 10 μA

Control voltage VCTL = low

VCTL = high

0.2

1.8

0.2

5.0

Note 1: Performance is guaranteed only under the conditions listed in this Table.

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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Typical Performance Characteristics

(CBLK = 1000 pF, CBYPASS = 1000 pF, VCTL = 3 V, TOP = +25 C, Characteristic Impedance [ZO] = 50 Ω, Driven and Measured

Single-Ended, Unless Otherwise Noted)

–1.0

–0.8

–0.9

–0.6

–0.7

–0.4

–0.5

–0.2

–0.3

–0.1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Frequency (GHz)

Insertion Loss (dB)

Figure 3. Typical Insertion Loss

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

–13.0

–12.8

–12.6

–12.4

–12.2

–12.0

–11.8

–11.6

–11.4

–11.2

–11.0

Frequency (GHz)

Attenuation (dB)

Figure 5. Typical Attenuation

(Normalized to Insertion Loss)

–35

–30

–25

–20

–15

–10

–5

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Frequency (GHz)

Return Loss (dB)

Figure 4. Return Loss Insertion State

–30

–25

–20

–15

–10

–5

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Frequency (GHz)

Return Loss (dB)

Figure 6. Return Loss Attenuation State

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

200935D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 16, 2010 5

Table 4. SKY12407-321LF Truth Table

State (J1-J2) VCTL1 VCTL2

Reference insertion loss high low

12 dB attenuation low high

Note: high = +1.8 to 5.0 V

low = 0 V

Any state other than described in this Table places the attenuator into an undefined state.

Evaluation Board Description

The SKY12407-321LF Evaluation Board is used to test the

performance of the SKY12407-321LF digital attenuator. An

assembly drawing for the Evaluation Board is shown in Figure 7

and an Evaluation Board schematic diagram is shown in Figure 8.

Table 5 provides the Bill of Materials (BOM) list for Evaluation

Board components.

Package Dimensions

The PCB layout footprint for the SKY12407-321LF is shown in

Figure 9. Typical case markings are noted in Figure 10. Package

dimensions for the 12-pin QFN are shown in Figure 11, and tape

and reel dimensions are provided in Figure 12.

Package and Handling Information

Instructions on the shipping container label regarding exposure to

moisture after the container seal is broken must be followed.

Otherwise, problems related to moisture absorption may occur

when the part is subjected to high temperature during solder

assembly.

THE SKY12407-321LF is rated to Moisture Sensitivity Level 1

(MSL1) at 260 C. It can be used for lead or lead-free soldering.

For additional information, refer to the Skyworks Application Note,

Solder Reflow Information, document number 200164.

Care must be taken when attaching this product, whether it is

done manually or in a production solder reflow environment.

Production quantities of this product are shipped in a standard

tape and reel format. For packaging details, refer to the Skyworks

Application Note, Discrete Devices and IC Switch/Attenuators

Tape and Reel Package Orientation, document number 200083.

NC/RF1

TEST BOARD

SK41042-1

RF1/GND1

NC/RF3

RF2/GND2

NC/RF2

VDD/VC1

VC1\NC

VC2

NC/VC3

NC/VC4

NC/RF4

REV 1

BP2

= 1000 pF

To Ground (2 Places)

BP1

= 1000 pF

DC Blocking Cap (4 Places)

RFIN

RFIP RFOP

RFON

VCTL1 VCTL2

Figure 7. SKY12407-321LF Evaluation Board Assembly Diagram

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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S1749

456

12 11 10

RFIP

CBYPASS1

RFIN

GND

VCTL1

GND

VCTL2

RFOP

CBYPASS2

RFON

CBLK

CBP1

RFIP

CBLK

RFIN

Control Voltage

(1.8-5.0 V)

Control Voltage

(1.8-5.0 V)

CBLK

CBP2

RFOP

CBLK

RFON

Figure 8. SKY12407-321LF Evaluation Board Schematic Diagram

Table 5. SKY12407-321LF Evaluation Board bill of Materials

Component Value Size Manufacturer/Part Series

CBLK 1000 pF 0402 Murata GRM

CBP1, CBP2 1000 pF 0402 Murata GRM

12X 0.95

(To Metal Pads)

Pitch 0.50 1.32 (Sq.)

Solder

Area

4X Ø0.33

Ground Via

See Detail A

Solder Area

0.23

Detail A 12X

Scale = 48X

0.75

All measurements in millimeters

S1748

Figure 9. SKY12407-321LF PCB Layout Footprint

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

200935D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 16, 2010 7

Pin 1

Indicator Skyworks

Part #

Lot #

Date Code:

Y = Calendar Year

WW = Week

Figure 10. Typical Part Markings

(Top View)

S1542

Top View Side View Bottom View

0.25 C

Pin 1

Indicator

0.25 C

0.10 C

16X

2X 4

0.10

3.00

–A–

–B–

–C–

0.20 Ref

Seating Plane

0.18

0.435

0.18

Detail A

Detail CDetail B

0.02

0.73

1.000

0.500

BSC

1.45 +0.10/–0.15

0.55 +0.10

1.45 +0.10/–0.15

0.23 +0.07/–0.05

Exposed Pad

0.75 ± 0.05

0.100 M C A B

Detail B

Detail A Detail C

All measurements are in millimeters.

Dimensioning and tolerancing according to ASME Y14.5M-1994.

Coplanarity applies to the exposed heat sink slug as well as the terminals..

Plating requirement per source control drawing (SCD) 2504.

All contact points are Au-plated, Pb-free surfaces.

Figure 11. SKY12407-321LF 12-Pin QFN Package Dimensions

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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S1698

8.00 ± 0.10

R0.25 Typ.

12.00 ± 0.30

4.00 ± 0.10

5.50 ± 0.05

2.00 ± 0.05

1.75 ± 0.10

Pin #1

∅1.50 + 0.1/–0.0

3.30 ± 0.10 (Ao)

3.30 ± 0.10 (Bo)

∅1.50 Min.

Notes:

1. Carrier tape: black conductive polystyrene, non-bakeable material.

2. Cover tape material: transparent conductive HSA.

3. Cover tape size: 9.20 mm width.

4. All measurements are in millimeters.

0.30 ± 0.05 (T)

1.10 ± 0.10 (Ko)

Figure 12. SKY12407-321LF Tape and Reel Dimensions

DATA SHEET • SKY12407-321LF DIFFERENTIAL DIGITAL ATTENUATOR

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

200935D • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 16, 2010 9

Ordering Information

Model Name Manufacturing Part Number Evaluation Board Part Numbers

SKY12407-321LF Differential Digital Attenuator SKY12407-321LF SK41042-1, rev. 1

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