Datasheet AA260-85 Datasheet (ALPHA)

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com 1

Specifications subject to change without notice. 12/00A

GaAs IC 5 Bit Digital Attenuator
1 dB LSB DC–2 GHz

Features

■ Attenuation 1.0 dB Steps to 31 dB
with High Accuracy

■ Low DC Power Consumption

■ Low Cost SSOP-20 Plastic Package

SSOP-20

AA260-85

(Previously AD260-85)*

Description

The AA260-85 is a 5 bit, GaAs IC FET digital attenuator
in a low cost SSOP-20 package.This attenuator has an
LSB of 1 dB and a total attenuation of 31 dB. The
AA260-85 is particularly suited where high attenuation
accuracy, low insertion loss and low intermodulation
products are required. Typical applications include
cellular radio, wireless data, wireless local loop and other
gain level control circuits.

Parameter

1

Condition Frequency

2

Min. Typ. Max. Unit

Insertion Loss DC–0.5 GHz 1.4 1.7 dB

DC–1.0 GHz 1.6 2.0 dB

DC–2.0 GHz 2.0 2.3 dB
Attenuation Range 31 dB
Attenuation Accuracy

3

DC–1.0 GHz ± (0.2 + 3% of

Attenuation Setting in dB) dB

DC–1.8 GHz ± (0.4 + 5% of

Attenuation Setting in dB) dB

DC–2.0 GHz ± (0.5 + 6% of

Attenuation Setting in dB) dB
VSWR (I/O) DC–2.0 GHz 1.4:1 1.7:1
Switching Characteristics

4

Rise, Fall (10/90% or 90%/10% RF) 15 nS
On, Off (50% CTL to 90%/10% RF) 25 nS
Video Feedthru 25 mV

Input Power for 1 dB Compression V

High

= -5 V 0.5–2.0 GHz +25 +29 dBm

0.05 GHz +18 +22 dBm

Intermodulation Intercept Point (IP3) For Two-tone Input Power +5 dBm 0.5–2.0 GHz +42 +48 dBm

V

High

= -5 V 0.05 GHz +30 +36 dBm

Control Voltages V

Low

= 0 to 0.2 V @ 20 µA Max.

V

High

= -5 V @ 300 µA Max.

Electrical Specifications at -40°C to +85°C (0, -5 V)

1.All measurements made in a 50 Ω system, unless otherwise specified.

2. DC = 300 kHz.

3. Attenuation referenced to insertion loss.

4.Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.

*Due to conflict with another company’s product numbering system, Alpha’s attenuator products starting with the letters “AD” are being changed to “AA”.

±0.012 (0.30 mm)

PIN 20

0.209 (5.30 mm)

0.307 (7.80 mm)

±0.016 (0.307 mm)

(1.75 mm)
(0.10 mm)

0.069

±0.004

(0.30 mm)

PIN 1

INDICATOR

0.0256

(0.65 mm)

BSC

0.012
REF.

PIN 1

0.283 (7.20 mm)

±0.012 (0.30 mm)

0.078

(2.00 mm)

MAX.

0.008 (0.20 mm) MAX.

0.002 (0.05 mm) MIN.

0.010 (0.25 mm)

0.004 (0.090 mm)

0.030 (0.75 mm)

±0.008 (0.10 mm)

8˚ MAX.

2 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com

Specifications subject to change without notice. 12/00A

GaAs IC 5 Bit Digital Attenuator 1 dB LSB DC–2 GHz AA260-85

Insertion Loss (dB)

Frequency (GHz)

Insertion Loss vs. Frequency

0 0.5 1.0 1.5 2.0

-2.0

-1.8

-1.6

-1.4

-1.2

-1.0

+25˚C

+85˚C

-40˚C

IP3 (dBm)

Attenuation (dB)

IP3 vs. Attenuation and

Temperature (500 MHz)

44

46

48

50

52

54

56

58

60

+25˚C

+85˚C

-40˚C

0 2 4 6 8 1012141618202224262830

VSWR

Frequency (GHz)

VSWR vs. Frequency (25˚C)

1.00

1.25

1.50

1.75

2.00

0 0.5 1.0 1.5 2.0

Ins. Loss

1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

VSWR

Frequency (GHz)

VSWR vs. Frequency (85˚C)

1.00

1.25

1.50

1.75

2.00

0 0.5 1.0 1.5 2.0

Ins. Loss
1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

VSWR

Frequency (GHz)

VSWR vs. Frequency (-40˚C)

1.00

1.25

1.50

1.75

2.00

0 0.5 1.0 1.5 2.0

Ins. Loss

1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

Typical Performance Data (0, -5 V)

Compression Point vs. Attenuation,
Voltage, and Temperature

Attenuation Control

Input Power @ 1 dB Compression

State Voltage (V)+25°C (dBm) +85°C (dBm) -40°C (dBm)

Ins. Loss -5 29.6 29.4 29.9

1 dB -5 30.1 29.8 30.5
2 dB -5 29.5 29.4 29.6
4 dB -5 34.0 32.7 32.9

8 dB -5 29.5 29.3 29.8
16 dB -5 28.6 28.6 28.3
31 dB -5 32.1 31.6 31.3

Frequency = 0.5–2.0 GHz

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com 3

Specifications subject to change without notice. 12/00A

GaAs IC 5 Bit Digital Attenuator 1 dB LSB DC–2 GHz AA260-85

Deviation from Nominal

Attenuation (dB)

Frequency (GHz)

Attenuation Accuracy

vs. Frequency (25˚C)

-2.5

-2.0

-1.5

-1.0

-0.5

0

0.5

0

0.5 1.0 1.5 2.0

1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

Deviation from Nominal

Attenuation (dB)

Frequency (GHz)

Attenuation Accuracy

vs. Frequency (85˚C)

-2.5

-2.0

-1.5

-1.0

-0.5

0

0.5

0

0.5 1.0 1.5 2.0

1 dB

2 dB

4 dB8 dB16 dB

31 dB

Deviation from Nominal

Insertion Phase (Deg.)

Frequency (GHz)

Attenuation Phase Accuracy

vs. Frequency (25˚C)

-10

0

10

20

30

40

50

60

0 0.5 1.0 1.5 2.0

1 dB2 dB4 dB

8 dB

16 dB

31 dB

Deviation from Nominal

Insertion Phase (Deg.)

Frequency (GHz)

Attenuation Phase Accuracy

vs. Frequency (85˚C)

-10

0

10

20

30

40

50

60

0 0.5 1.0 1.5 2.0

1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

Deviation from Nominal

Attenuation (dB)

Frequency (GHz)

Attenuation Accuracy

vs. Frequency (-40˚C)

-2.5

-2.0

-1.5

-1.0

-0.5

0

0.5

0 0.5 1.0 1.5 2.0

1 dB

2 dB4 dB8 dB16 dB

31 dB

Deviation from Nominal

Insertion Phase (Deg.)

Frequency (GHz)

Attenuation Phase Accuracy

vs. Frequency (-40˚C)

-10

0

10

20

30

40

50

60

0 0.5 1.0 1.5 2.0

2 dB

4 dB

8 dB

16 dB

31 dB

1 dB

4 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com

Specifications subject to change without notice. 12/00A

GaAs IC 5 Bit Digital Attenuator 1 dB LSB DC–2 GHz AA260-85

Insertion Loss (dB)

Frequency (GHz)

Insertion Loss vs. Frequency

-2.0

-1.8

-1.6

-1.4

-1.2

-1.0

0 0.5 1.0 1.5 2.0

+25˚C +85˚C-40˚C

VSWR vs. Frequency (25˚C)

VSWR

Frequency (GHz)

1.00

1.25

1.50

1.75

2.00

0 0.5 1.0 1.5 2.0

Ins. Loss

1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

Deviation from Nominal

Attenuation (dB)

Frequency (GHz)

Attenuation Accuracy

vs. Frequency (25˚C)

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0

0.5

0 0.5 1.0 1.5 2.0

1 dB

2 dB4 dB8 dB16 dB

31 dB

Deviation from Nominal

Attenuation (dB)

Frequency (GHz)

Attenuation Accuracy

vs. Frequency (85˚C)

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0

0.5

0 0.5 1.0 1.5 2.0

1 dB

2 dB4 dB8 dB16 dB

31 dB

Deviation from Nominal

Insertion Phase (Deg.)

Frequency (GHz)

Attenuation Phase Accuracy

vs. Frequency (25˚C)

-10

0

10

20

30

40

50

60

0 0.5 1.0 1.5 2.0

1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

Deviation from Nominal

Attenuation (dB)

Frequency (GHz)

Attenuation Accuracy

vs. Frequency (-40˚C)

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0

0.5

0 0.5 1.0 1.5 2.0

1 dB

2 dB

4 dB

8 dB

16 dB

31 dB

Typical Performance Data (0, -3 V)

Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email [e-mail] • www.alphaind.com 5

Specifications subject to change without notice. 12/00A

GaAs IC 5 Bit Digital Attenuator 1 dB LSB DC–2 GHz AA260-85

Truth Table

V

9

V

8

V

7

V

6

V

5

V

4

V

3

V

2

NC

V

1

J

1

J

2

GND
GND

GND
GND

GND
GND

GND
GND

12345678

20 19 18 17 16 15 14 13

16 dB

8 dB

4 dB

2 dB

1 dB

910

12 11

Characteristic Value

RF Input Power 2.0 W > 500 MHz 0/-8 V

0.5 W > 50 MHz 0/-8 V

Control Voltage +0.2 V, -8 V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C

Θ

JC

85°C/W

Absolute Maximum Ratings

Pin Out

Note: Exceeding these ratings may cause irreversible damage.

V1V2V3V4V5V6V7V8V

9

1 dB 2 dB 4 dB 8 dB 16 dB

Bit Bit Bit Bit Bit

-5 -5 0 -5 0 -5 0 -5 0 Reference I.L.
0 -5 0 -5 0 -5 0 -5 0 1 dB

-5 0 -5 -5 0 -5 0 -5 0 2 dB

-5 -5 0 0 -5 -5 0 -5 0 4 dB

-5 -5 0 -5 0 0 -5 -5 0 8 dB

-5 -5 0 -5 0 -5 0 0 -5 16 dB
0 0 -5 0 -5 0 -5 0 -5 31 dB Max. Atten.

Attenuation

J1-J

2

IP3 (dBm)

Attenuation (dB)

IP3 vs. Attenuation and

Temperature (500 MHz)

44

46

48

50

52

54

56

58

60

0 2 4 6 8 1012141618202224262830

+25˚C

+85˚C

-40˚C

Compression Point vs. Attenuation,
Voltage, and Temperature

Attenuation Control

Input Power @ 1 dB Compression

State Voltage (V)+25°C (dBm) +85°C (dBm) -40°C (dBm)

Ins. Loss -3 24.8 24.7 24.7

1 dB -3 26.2 25.9 25.7
2 dB -3 24.7 24.5 24.6
4 dB -3 29.3 28.7 29.0

8 dB -3 32.3 31.7 32.3
16 dB -3 21.6 21.2 21.7
31 dB -3 24.5 24.4 24.9

Frequency = 0.5–2.0 GHz