TW17-D920 - SKYWORKS SOLUTIONS

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

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DATA SHEET

SKY65047-360LF: 0.4-3.0 GHz Low-Noise Amplifier

Applications

• Wireless infrastructure: WLAN, WiMAX, broadband, cellular base

stations

• Test instrumentation

• Satellite receivers

• Paging

• Remote metering

• WLL and ISM receivers

• GPS receivers

Features

• Noise Figure = 1.2 dB @ 915 MHz

• Noise Figure = 0.8 dB @ 1575 MHz

• Noise Figure = 1.1 dB @ 2450 MHz

• Small signal gain = 16.6 dB @ 1575 MHz

• Low operating current = 7.2 mA

• External, adjustable bias setting

• Built-in power-down control

• Single DC supply voltage, 2.7 V to 3.8 V

• Miniature DFN (8-pin, 2 x 2 mm) package (MSL1, 260 °C per

JEDEC J-STD-020)

Figure 1. SKY65047-360LF Block Diagram

Description

The SKY65047-360LF is a high linearity Low-Noise Amplifier

(LNA). The excellent gain, superior low-noise and low current

consumption makes the SKY65047-360LF ideal for use in

wireless infrastructure applications. The device may also be used

in a variety of LNA applications. All active circuitry in the module is

contained in a single Microwave Monolithic Integrated Circuit

(MMIC).

The device is manufactured with an advanced silicon germanium

(SiGe) process, which allows a single supply operation while

maintaining excellent low-noise performance and linearity. The

SKY65047-360LF is provided in a low-cost, miniature 2 x 2 mm

Dual Flat No-Lead (DFN) package.

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.

Figure 2. SKY65047-360LF Pinout – 8-Pin DFN

(Top View)

DATA SHEET • SKY65047-360LF LOW NOISE AMPLIFIER

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Table 1. SKY65047-360LF Signal Descriptions

Pin # Name Description Pin # Name Description

1 GND Ground 5 VBIAS VCC bias voltage

2 RF_IN RF input 6 BIAS_R Bias reference voltage

3 GND Ground 7 RF_OUT/BIAS RF output/VCC bias

4 GND Ground 8 EN Amplifier enable control

Functional Description

The SKY65047-360LF is a single stage, low noise amplifier in a

low-cost surface mount package. The device operates with a

single +3.3 V power supply connected through an RF choke to the

output pin. Surface mount capacitors provide DC bias decoupling

for VCC.

The bias current is set by a reference voltage transistor and by

resistor R1. Pin 2 (RF_IN) is the RF input and Pin 7 (RF-OUT/BIAS)

is the RF output. The part is externally RF matched and DC

blocked using surface mount components to facilitate operation

over a frequency range of 0.4 to 3.0 GHz. Pins 1, 3, and 4, and the

package backside metal provide the DC and RF ground.

The SKY65047-360LF includes an internal PA enable (pin 8, EN)

for fast RF on/off control. A logic low voltage level disables the PA;

a logic high voltage level enables the PA.

Electrical and Mechanical Specifications

The absolute maximum ratings of the SKY65047-360LF are

provided in Table 2. The recommended operating conditions are

specified in Table 3 and electrical specifications are provided in

Table 4.

Typical performance characteristics for the SKY65047-360LF are

illustrated in Figures 3 through 8.

Table 2. SKY65047-360LF Absolute Maximum Ratings

Parameter Symbol Minimum Typical Maximum Units

Supply voltage VCC 4 V

Total supply current IBIAS 20 mA

RF input power PIN +20 dBm

Storage temperature TSTG –65 +125 °C

Junction temperature TJ +125 °C

Case temperature TCASE –40 +85 °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.

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.

Table 3. SKY65047-360LF Recommended Operating Conditions

Parameter Symbol Minimum Typical Maximum Units

Frequency f 0.4 3.0 GHz

RF input power PIN –20 dBm

Bias supply voltage (Note 1) VBIAS 2.7 3.3 3.8 V

Amplifier enable control (on) EN_ON VCC–0.3 VCC V

Amplifier enable control (off) EN_OFF 0 0.2 V

Operating temperature TOP –40 +25 +85 °C

Note 1: Voltage applied to pin 5 (VBIAS) and pin 7 (RF_OUT/BIAS).

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Table 4. SKY65047-360LF Electrical Specifications (Note 1) (1 of 2)

(VBIAS and EN = 3.3 V, Characteristic Impedance [ZO] = 50 Ω, TCASE = 25 °C, Unless Otherwise Noted)

Parameter Symbol Test Condition Min Typical Max Units

450 MHz Matched Performance

Gain G 19.6 dB

Gain variation over temperature G 25 °C to –40 °C or 25 °C

to +85 °C

±0.5 dB

Isolation Iso –32.7 dB

Noise Figure NF 1.4 dB

Noise Figure variation over temperature NF 25 °C to –40 °C or 25 °C

to +85 °C

±0.3 dB

3rd Order Input Intercept Point IIP3 –6 dBm

3rd Order Input Intercept Point variation over

temperature

IIP3 25 °C to –40 °C or 25 °C

to +85 °C

±0.7 dB

Input return loss IRL With external matching 14 dB

Output return loss ORL With external matching 15 dB

Supply current ICC Bias resistor = 4.7 kΩ 6.9 mA

915 MHz Matched Performance

Gain G 17 dB

Gain variation over temperature G 25 °C to –40 °C or 25 °C

to +85 °C

±0.4 dB

Isolation Iso 28 dB

Noise Figure NF 1.2 dB

Noise Figure variation over temperature NF 25 °C to –40 °C or 25 °C

to +85 °C

±0.2 dB

1 dB Input Compression Point IP1dB –16.5 dBm

3rd Order Input Intercept Point IIP3 PIN = –30 dBm/tone,

200 kHz spacing

+0.8 dBm

3rd Order Input Intercept Point variation over

temperature

IIP3 25 °C to –40 °C or 25 °C

to +85 °C

±0.5 dB

Input return loss IRL With external matching 15.5 dB

Output return loss ORL With external matching 12.7 dB

Supply current ICC Bias resistor = 4.7 kΩ 6.5 mA

1575 MHz Matched Performance

Gain G 16.6 dB

Gain variation over temperature G 25 °C to –40 °C or 25 °C

to +85 °C

±0.6 dB

Isolation Iso 22 26 dB

Noise Figure NF 0.8 1.2 dB

Noise Figure variation over temperature NF 25 °C to –40 °C or 25 °C

to +85 °C

±0.3 dB

1 dB Input Compression Point IP1dB –18.4 –15.8 dBm

3rd Order Input Intercept Point IIP3 PIN = –30 dBm/tone,

200 kHz spacing

+1.0 +3.2 dBm

3rd Order Input Intercept Point variation over

temperature

IIP3 25 °C to –40 °C or 25 °C

to +85 °C

±0.8 dB

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Table 4. SKY65047-360LF Electrical Specifications (Note 1) (2 of 2)

(VBIAS and EN = 3.3 V, Characteristic Impedance [ZO] = 50 Ω, TCASE = 25 °C, Unless Otherwise Noted)

Parameter Symbol Test Condition Min Typical Max Units

1575 MHz Matched Performance (continued)

Input return loss IRL With external matching 10.0 14.5 dB

Output return loss ORL With external matching 10 12 dB

Supply current ICC Bias resistor = 4.7 kΩ 7.2 mA

1900 MHz Matched Performance

Gain G 15.9 dB

Gain variation over temperature G 25 °C to –40 °C or 25 °C

to +85 °C

±0.3 dB

Isolation Iso 22 dB

Noise Figure NF 1.3 dB

Noise Figure variation over temperature NF 25 °C to –40 °C or 25 °C

to +85 °C

±0.2 dB

1 dB Input Compression Point IP1dB –12.8 dBm

3rd Order Input Intercept Point IIP3 +4.7 dBm

3rd Order Input Intercept Point variation over

temperature

IIP3 25 °C to –40 °C or 25 °C

to +85 °C

±0.4 dB

Input return loss IRL With external matching 18 dB

Output return loss ORL With external matching 23 dB

Supply current ICC Bias resistor = 4.7 kΩ 7.1 mA

2450 MHz Matched Performance

Gain G 14.8 dB

Gain variation over temperature G 25 °C to –40 °C or 25 °C

to +85 °C

±0.3 dB

Isolation Iso 21 dB

Noise Figure NF 1.1 dB

Noise Figure variation over temperature NF 25 °C to –40 °C or 25 °C

to +85 °C

±0.2 dB

1 dB Input Compression Point IP1dB –9.6 dBm

3rd Order Input Intercept Point IIP3 PIN = –30 dBm/tone,

200 kHz spacing

+7.5 dBm

3rd Order Input Intercept Point variation over

temperature

IIP3 25 °C to –40 °C or 25 °C

to +85 °C

±0.3 dB

Input return loss IRL With external matching 14 dB

Output return loss ORL With external matching 16 dB

Supply current ICC Bias resistor = 4.7 kΩ 6.4 mA

Power-Down

Leakage current ILKG No RF 0.1 μA

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

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Typical Performance Characteristics

(VBIAS and EN = 3.3 V, Characteristic Impedance [ZO] = 50 Ω, TCASE = 25 °C, Unless Otherwise Noted)

Figure 3. Gain Over Temperature and Frequency

Figure 5. IIP3 Over Temperature and Frequency

Figure 7. Noise Figure Over Temperature and Frequency

Figure 4. Gain Over Supply Voltage and Frequency

Figure 6. IIP3 Over Supply Voltage and Frequency

Figure 8. Noise Figure Over Supply Voltage and Frequency

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Evaluation Board Description

The SKY65047-360LF Evaluation Board is used to test the

performance of the SKY65047-360LF LNA. Three different boards

are available, depending on the desired performance frequency:

915 MHz, 1575 MHz, and 2450 MHz.

Evaluation Board schematic diagrams are provided in Figures 9,

11, and 13. Assembly drawings for the Evaluation Board are

shown in Figures 10, 12, and 14.

Evaluation Board layer detail drawings for the 915 MHz,

1575 MHz, and 2450 MHz boards are shown in Figures 15, 16,

and 17, respectively. Layer detail physical characteristics are

noted in Figure 18.

Circuit Design Considerations

The following design considerations are general in nature and

must be followed regardless of final use or configuration:

1. Paths to ground should be made as short as possible.

2. The ground pad of the SKY65047-360LF has special electrical

and thermal grounding requirements. This pad is the main

thermal conduit for heat dissipation. Since the circuit board

acts as the heat sink, it must shunt as much heat as possible

from the device. Therefore, design the connection to the

ground pad to dissipate the maximum wattage produced by

the circuit board. Multiple vias to the grounding layer are

required.

NOTE: A poor connection between the slug and ground increases

junction temperature (TJ), which reduces the lifetime of the

device.

Evaluation Board Test Procedure

Step 1: Connect RF test equipment to amplifier input/output SMA

connectors.

Step 2: Connect DC ground.

Step 3: Connect VCC to a +3.3 V supply. Verify that the board

draws approximately 6.7 mA.

Step 4: Connect pin 8 (EN) to a +3.3 V supply to enable the LNA.

Set EN to 0 V to disable the LNA.

Step 5: Apply an RF input signal of –40 dBm and observe the

output signal level. This level should be approximately

–23.5 dBm with a gain equal to approximately 16.5 dB.

Application Circuit Notes

Center Ground. It is extremely important to sufficiently ground the

bottom ground pad of the device for both thermal and stability

reasons. Multiple small vias are acceptable and will work well

under the device if solder migration is an issue.

GND (pins 1, 3, and 4). Attach all ground pins to the RF ground

plane with the largest diameter and lowest inductance via that the

layout allows. Multiple small vias are acceptable and will work

well under the device if solder migration is an issue. Pin 3 can

also be connected to ground with a small inductance of emitter

degeneration.

RF_IN (pin 2). The LNA requires a DC blocking capacitor as part

of the external RF matching.

VBIAS (pin 5). The bias supply voltage for the LNA is typically set

to +3.3 V using a bias resistor.

BIAS_R (pin 6). This pin is typically connected to ground through

a bias resistor.

RF_OUT/BIAS (pin 7). The LNA collector supply voltage is

supplied through an RF choke (component L3 on the 915 MHz and

2450 MHz Evaluation Boards, and component L2 on the 1575 MHz

Evaluation Board) to the output at pin 7. The LNA requires a DC

blocking capacitor as part of the external RF matching.

EN (pin 8). A logic low voltage level disables the internal PA; a

logic high voltage level enables the internal PA.

Package Dimensions

The PCB layout footprint for the SKY65047-360LF is shown in

Figure 19. Typical case markings are shown in Figure 20.

Package dimensions for the 8-pin DFN are shown in Figure 21,

and tape and reel dimensions are provided in Figure 22.

Package and Handling Information

Since the device package is sensitive to moisture absorption, it is

baked and vacuum packed before shipping. 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 SKY65047-360LF 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.

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Figure 9. SKY65047-360LF Evaluation Board Schematic

(915 MHz)

Figure 10. SKY65047-360LF Evaluation Board Assembly Diagram

(915 MHz)

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Figure 11. SKY65047-360LF Evaluation Board Schematic

(1575 MHz)

Figure 12. SKY65047-360LF Evaluation Board Assembly Diagram

(1575 MHz)

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Figure 13. SKY65047-360LF Evaluation Board Schematic

(2450 MHz)

Figure 14. SKY65047-360LF Evaluation Board Assembly Diagram

(2450 MHz)

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Figure 15. SKY65047-360LF Evaluation Board Layer Detail

(915 MHz)

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Figure 16. SKY65047-360LF Evaluation Board Layer Detail

(1575 MHz)

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Figure 17. SKY65047-360LF Evaluation Board Layer Detail

(2450 MHz)

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Figure 18. Layer Detail Physical Characteristics

Figure 19. SKY65047-360LF PCB Layout Footprint

(Top View)

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Figure 20. Typical Case Markings

(Top View)

Figure 21. SKY65047-360LF 8-Pin DFN Package Dimensions

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Figure 22. SKY65047-360LF Tape and Reel Dimensions

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Ordering Information

Model Name Manufacturing Part Number Evaluation Board Part Number

SKY65047-360LF Low Noise Amplifier SKY65047-360LF TW17-D900 (915 MHz)

TW17-D910 (1575 MHz)

TW17-D920 (2450 MHz)

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