75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
1
1
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DC-0006843
1
Features
75 Ω Impedance
Integrated TTL/CMOS Compatible Driver
Parallel & Serial (P/S) Control with power-up
state selection
0.5-dB Attenuation Steps to 31.5 dB
Low DC Power Consumption
Lead-Free 4 mm PQFN-24LD Plastic Package
Halogen-Free ―Green‖ Mold Compound
RoHS* Compliant and 260°C Re-flow Compatible
Description
The MAAD-008866 is a 6-bit, 0.5-dB step GaAs
digital attenuator in a lead-free 4 mm PQFN-24LD
surface mount plastic package.
This device is ideally suited for use where high
accuracy, very low power consumption and low
intermodulation products are required. This part can
be used in all 75 Ω systems operating up to
1.218 GHz.
Functional Schematic3
3. Blocking capacitors are required on all RF ports
Pin Configuration
Pin # Function Pin # Function
1 Parallel / Serial
Select 16 Power Up State 2
2 Clock 17 Power Up State 1
3 Serial Data In 18 Bias Voltage
4 Latch Enable 19 B5
5 Ground 20 B4
6 RF Input 21 B3
7 - 12 RF Ground 22 B2
13 RF Output 23 B1
14 No Connection 24 B0
15 Serial Data Out 25 Paddle4
* Restrictions on Hazardous Substances, European Union Directive 2011/65/EU.
1
24
12
18
6
P/S
CLK
LE
GND
RFIN
SERIN
VDD
PUP1
SEROUT
N/C
RFOUT
PUP2
RF GND
RF GND
RF GND
RF GND
RF GND
B0 B3
B1 B4
B2 B5
RF GND
4. The exposed pad centered on the package bottom must be
connected to the RF and DC ground.
Part Number Package
MAAD-008866-TR3000 3000 piece reel
MAAD-008866-001SMB Sample Board
Ordering Information1,2
1. Reference Application Note M513 for reel size information.
2. All sample boards include 5 loose parts.
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
2
2
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Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
2
Electrical Specifications5,6: TA = 25°C, Z0 = 75 Ω, VDD = 5 V, VC = 5 V
Parameter Test Conditions Units Min. Typ. Max.
Reference Insertion Loss
5 MHz
50 MHz
500 MHz
1000 MHz
dB
—
—
—
—
1.3
1.35
1.6
1.8
—
—
—
2.3
Attenuation Accuracy Any Bit or combination
5 - 1000 MHz ± (0.15 dB + 4% of attenuation setting in dB)
Return Loss 5 - 1000 MHz dB — 18 —
TRISE, TFALL 10% to 90% RF, 90% to 10% RF ns — 320 —
TON, TOFF 50% Control to 90 / 10% RF ns — 340 —
Transients In Band mV — 88 —
Input P1dB 50 MHz
1000 MHz dBm — 12
25.6 —
IIP3
0 dBm/tone at Input, 6 MHz Spacing
50 MHz
1000 MHz
dBm — 33
43 —
IIP2
0 dBm/tone at Input, 6 MHz Spacing
50 MHz
1000 MHz
dBm — 51
74 —
Composite Triple Beat, CTB 132 channels, +30 dBmV/channel at the input dBc — -88 —
Composite Second Order, CSO 132 channels, +30 dBmV/channel at the input dBc — -69 —
Steady State IDD VDD = +5 V µA — 4 —
5. External DC blocking capacitors are required on all RF ports. Loss varies at 0.003 dB/°C.
6. Low frequency is determined by DC block and RF GND capacitor value.
Truth Table9
B5 B3 B2 B1 Attenuation (dB) B4 B0
1 1 1 1 Reference IL 1 1
1 1 1 1 1 0 0.5
1 1 1 1 0 1 1
1 1 0 1 2 1 1
1 0 1 1 4 1 1
1 1 1 1 8 0 1
0 1 1 1 16 1 1
0 0 0 0 31.5 0 0
9. Logic ―0‖ = 0 to +0.8 V, Logic ―1‖ = +2 to +5 V.
Absolute Maximum Ratings7,8
Parameter Absolute Maximum
Input Power
50 MHz
1000 MHz
+15 dBm
+27 dBm
Operating Voltage +8.5 V
Control Voltage -0.5 V < VC < 5.5 V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C
7. Exceeding any one or combination of these limits may cause
permanent damage to this device.
8. MACOM does not recommend sustained operation near these
survivability limits.
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
3
3
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
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DC-0006843
3
Recommended PCB
Off-Chip Component Values
Component Value Package
C1 & C2 0.1 µF 0402
C3 - C8 0.1 µF 0201
Application10
1
24
12
18
P/S
CLK
LE
RFIN
SERIN
VDD
PUP1
SEROUT
RFOUT
PUP2
B0 B3
B1 B4
B2 B5
C1 C2
C3 C4 C5 C6 C7 C8
C1, C2 = 0.1 µF (0402)
C3 – C8 = 0.1 µF (0201)
6
10.Capacitors C3 - C8 should be as close to package pins as
possible.
Handling Procedures
Please observe the following precautions to avoid
damage:
Static Sensitivity
Gallium Arsenide Integrated Circuits are sensitive to
electrostatic discharge (ESD) and can be damaged
by static electricity. Proper ESD control techniques
should be used when handling these devices. An
external protection circuit using an inexpensive
anti-parallel diode pair can be used to protect the IC.
Please reference application note AN3028 for further
detail.
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
4
4
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
4
Typical Performance Curves
Relative Attenuation across all major states
Insertion Loss
Input Return Loss, across all attenuation states Output Return Loss, across all attenuation states
-2.4
-2.0
-1.6
-1.2
-0.8
-0.4
0.0
0.0 0.2 0.4 0.6 0.8 1.0
+25°C
-40°C
+85°C
Frequency (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.0 0.2 0.4 0.6 0.8 1.0
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
Frequency (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0.0 0.2 0.4 0.6 0.8 1.0
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
Frequency (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.0 0.2 0.4 0.6 0.8 1.0
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
Frequency (GHz)
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
5
5
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
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DC-0006843
5
Typical Performance Curves @ 5 Volts
Step Error vs. State over Temp @ 1000 MHz Step Error vs. State over Temp @ 500 MHz
Step Error vs. State over Frequency Step Error vs. State over Temp @ 5 MHz
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
0 4 8 12 16 20 24 28 32
5 MHz
50 MHz
500 MHz
1000 MHz
State (dB)
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
0 4 8 12 16 20 24 28 32
+25°C
-40°C
+85°C
State (dB)
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
0 4 8 12 16 20 24 28 32
+25°C
-40°C
+85°C
State (dB)
-1.00
-0.75
-0.50
-0.25
0.00
0.25
0.50
0.75
1.00
0 4 8 12 16 20 24 28 32
+25°C
-40°C
+85°C
State (dB)
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
6
6
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
6
Typical Performance Curves @ 5 Volts
IIP3 vs. Frequency @ +85°C
IIP3 vs. Frequency @ -40°C
IIP3 vs. Frequency @ 25°C
IIP2 vs. Frequency @ +85°C
IIP2 vs. Frequency @ -40°C
IIP2 vs. Frequency @ 25°C
0
10
20
30
40
50
60
0200 400 600 800 1000
IL
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
Frequency (MHz)
0
10
20
30
40
50
60
0200 400 600 800 1000
IL
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
Frequency (MHz)
0
10
20
30
40
50
60
0200 400 600 800 1000
IL
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
Frequency (MHz)
0
10
20
30
40
50
60
70
80
90
100
0200 400 600 800 1000
IL
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
Frequency (MHz)
0
10
20
30
40
50
60
70
80
90
100
0200 400 600 800 1000
IL
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
Frequency (MHz)
0
10
20
30
40
50
60
70
80
90
100
0200 400 600 800 1000
IL
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
Frequency (MHz)
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
7
7
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
7
Functionality
Modes of Operation: Serial, Direct Parallel, and Latched Parallel
Mode Truth Table
P/S LE Mode
1 X Serial
0 Constant High Direct Parallel
0 Pulsed Latched Parallel
Serial Mode
Direct Parallel Mode
Latched Parallel Mode
The serial control interface (SERIN, CLK, LE, SEROUT) is compatible with the SPI protocol. SPI mode is
activated when P/S is kept high. The 6-bit serial word must be loaded with MSB first. After shifting in the 6 bit
word, bringing LE high will set the attenuator to the desired state. While LE is high the CLK is masked to protect
the data while implementing the change . SEROUT is the SERIN delayed by 6 clock cycles.
When P/S is low, the serial control interface is disabled and the serial input register is loaded asynchronously with
parallel digital inputs.
The parallel mode is enabled when P/S is set to low. In the direct parallel mode, the attenuator is controlled by the
parallel control inputs directly. The LE must be at logic high to control the attenuator in this mode.
In the latched parallel mode, the parallel control inputs will be buffered by registers, and loaded to the outputs
when LE is high. The outputs shall not change states when LE is low.
Power-up States
The power-up (PUP) states will work in both serial and parallel modes, and initiate the attenuator according to the
PUP truth table. During power up, the digital inputs shall be held constant for at least 1 μs after VDD reaches 90%
of final value. For serial mode, the PUP states will only work when LE is held low. The PUP state shall be locked
out after the first LE pulse.
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
8
8
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
8
Functionality
Modes of Operation: Serial, Direct Parallel, and Latched Parallel
PUP Truth Table*
Inputs
Gain Relative to Max. Gain Notes
PS LE PUP2 PUP1
0 0 0 0 -31.5 dB
Parallel Mode
0 0 0 1 -24 dB
0 0 1 0 -16 dB
0 0 1 1 Insertion Loss
0 1 X X 0 to –31.5 dB (Set VC0.5 - VC16)
1 0 X X 0 to –31.5 dB (Set VC0.5 - VC16) Serial Mode
1 1 X X No Definition
Serial Interface Timing Characteristics
Symbol Parameter
Typical Performance
Units
-40°C 25°C +85°C
tSCK Min. Serial Clock Period 100 100 100 ns
tCS Min. Control Set-up Time 20 20 20 ns
tCH Min. Control Hold Time 20 20 20 ns
tLS Min. LE Set-up Time 10 10 10 ns
tLEW Min. LE Pulse Width 10 10 10 ns
tLH Min. Serial Clock Hold Time from LE 10 10 10 ns
tLES Min. LE Pulse Spacing 630 630 630 ns
*VDD TRISE must be <= 125 ns
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
9
9
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
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For further information and support please visit:
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DC-0006843
9
tLH
LE
tLEW
30ns Minimum
tLS
Parallel Control Word
Serial Input Interface Timing Diagram
Functionality
Modes of Operation: Serial, Direct Parallel, and Latched Parallel
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
10
10
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
10
Lead Free 4 mm 24-Lead PQFN †
† Reference Application Note M538 for lead-free solder reflow recommendations.
Meets JEDEC moisture sensitivity level 1 requirements.
Plating is 100% matte tin over copper.
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
11
11
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
11
Electrical Specifications5,6: TA = 25°C, Z0 = 75 Ω, VDD = 5 V, VC = 5 V
Parameter Test Conditions Units Min. Typ. Max.
Reference Insertion Loss
5 MHz
50 MHz
500 MHz
1000 MHz
1218 MHz
dB
—
—
—
—
—
1.3
1.35
1.6
1.8
1.9
—
—
—
2.3
—
Attenuation Accuracy Any Bit or combination
5 - 1000 MHz ± (0.15 dB + 4% of attenuation setting in dB)
Return Loss 5 - 1218 MHz dB — 18 —
TRISE, TFALL 10% to 90% RF, 90% to 10% RF ns — 320 —
TON, TOFF 50% Control to 90 / 10% RF ns — 340 —
Transients In Band mV — 88 —
Input P1dB 50 MHz
1000 MHz dBm — 12
25.6 —
IIP3
0 dBm/tone at Input, 6 MHz Spacing
50 MHz
1000 MHz
dBm — 33
43 —
IIP2
0 dBm/tone at Input, 6 MHz Spacing
50 MHz
1000 MHz
dBm — 51
74 —
Composite Triple Beat, CTB 132 channels, +30 dBmV/channel at the input dBc — -88 —
Composite Second Order, CSO 132 channels, +30 dBmV/channel at the input dBc — -69 —
Steady State IDD VDD = +5 V µA — 4 —
5. External DC blocking capacitors are required on all RF ports. Loss varies at 0.003 dB/°C.
6. Low frequency is determined by DC block and RF GND capacitor value.
5 - 1218 MHz Application Section
Off-Chip Component Values
Component Value Package
C1 & C2 0.1 µF 0402
C3 - C8 0.1 µF 0201
1
24
12
18
P/S
CLK
LE
RFIN
SERIN
VDD
PUP1
SEROUT
RFOUT
PUP2
B0 B3
B1 B4
B2 B5
C1 C2
C3 C4 C5 C6 C7 C8
C1, C2 = 0.1 µF (0402)
C3 – C8 = 0.1 µF (0201)
6
10.Capacitors C3 - C8 should be as close to package pins as
possible.
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
12
12
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
12
Typical Performance Curves
Relative Attenuation across all major states
Insertion Loss
Input Return Loss, across all attenuation states Output Return Loss, across all attenuation states
5 - 1218 MHz Application Section
-2.4
-2.0
-1.6
-1.2
-0.8
-0.4
0.0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
+25°C
-40°C
+85°C
S21 (dB)
Frequency (GHz)
-35
-30
-25
-20
-15
-10
-5
0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
S21 (dB)
Frequency (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
S11 (dB)
Frequency (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
S22 (dB)
Frequency (GHz)
75 Ω Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.005 - 1.218 GHz
Rev. V4
MAAD-008866
13
13
MACOM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice.
Visit www.macom.com for additional data sheets and product information.
For further information and support please visit:
https://www.macom.com/support
DC-0006843
13
MACOM Technology Solutions Inc. All rights reserved.
Information in this document is provided in connection with MACOM Technology Solutions Inc ("MACOM")
products. These materials are provided by MACOM as a service to its customers and may be used for
informational purposes only. Except as provided in MACOM's Terms and Conditions of Sale for such products or
in any separate agreement related to this document, MACOM assumes no liability whatsoever. MACOM
assumes no responsibility for errors or omissions in these materials. MACOM may make changes to
specifications and product descriptions at any time, without notice. MACOM makes no commitment to update
the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future
changes to its specifications and product descriptions. No license, express or implied, by estoppels or otherwise,
to any intellectual property rights is granted by this document.
THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR
IMPLIED, RELATING TO SALE AND/OR USE OF MACOM PRODUCTS INCLUDING LIABILITY OR
WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR
INCIDENTAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR
OTHER INTELLECTUAL PROPERTY RIGHT. MACOM FURTHER DOES NOT WARRANT THE ACCURACY
OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN
THESE MATERIALS. MACOM SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS,
WHICH MAY RESULT FROM THE USE OF THESE MATERIALS.
MACOM products are not intended for use in medical, lifesaving or life sustaining applications. MACOM
customers using or selling MACOM products for use in such applications do so at their own risk and agree to
fully indemnify MACOM for any damages resulting from such improper use or sale.
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