Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.7 - 6.0 GHz
Features
Integrated CMOS/TTL Compatible Driver
Parallel & Serial (P/S) Control with power-up
state selection
Insertion Loss: 1.6 dB typical @ 2.1 GHz
IP3: 50 dBm typical @ 2 GHz
Attenuation Accuracy:
+/-(0.4 + 4% of attenuation setting) dB
0.5-dB Attenuation Steps to 31.5 dB
Useable from 0.4 to 8.0 GHz
Lead-Free 4 mm 24-Lead PQFN Package
Halogen-Free ―Green‖ Mold Compound
RoHS* Compliant and 260°C Re-flow Compatible
Small Relative Phase Variation per Bit
Rev. V2
Functional Schematic
3,4
VC0.5
VC16
19
18
VC2
24
VC1
VC4
VC8
P/S
CLK
SER_IN
LE
GND
RF_IN
1
V
DD
PUP1
PUP2
SER_OUT
N/C
6
7
12
13
RF_OUT
N/C
N/C
N/C
The MAAD-000523 is a 6-bit, 0.5-dB step GaAs
MMIC digital attenuator in a lead-free 4 mm 24 lead
PQFN surface mount plastic package. This device is
ideally suited for use where high accuracy, very low
power consumption and low intermodulation
products are required. Typical applications include
Cellular Basestation R
X
/T
X
Line-up, Femtocells, and
other gain / level control circuits.
This attenuator is controlled with either a SPI
compatible serial interface or a 6 bit parallel word.
3. Blocking capacitors are required on all RF ports.
4. For optimum RF performance all N/C’s should be terminated
to GND.
Pin Configuration
Pin No.
1
2
3
4
5
Function
P/S
CLK
Serial IN
LE
Ground
RF_IN
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
Pin No.
13
14
15
16
17
18
19
20
21
22
23
24
Function
RF_OUT
No Connection
Serial OUT
PUP2
PUP1
V
DD
VC16
VC8
VC4
VC2
VC1
VC0.5
Ordering Information
1
Part Number
MAAD-000523-TR1000
MAAD-000523-TR3000
MAAD-000523-001SMB
Package
1000 piece reel
3000 piece reel
Sample Board
6
7
8
9
10
11
12
1. Reference Application Note M513 for reel size information.
2. All sample boards include 5 loose parts.
* Restrictions on Hazardous Substances, European Union Directive 2002/95/EC.
1
M/A-COM 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
N/C
N/C
N/C
Description
MAAD-000523
Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.7 - 6.0 GHz
Electrical Specifications
5
: T
A
= 25°C, Z
0
= 50 Ω, V
DD
= 5 V, V
C
= 0/+5 V
6
Parameter
Test Conditions
0.7 GHz
2.1 GHz
4.0 GHz
6.0 GHz
0.7 - 6.0 GHz
0.7 - 6.0 GHz
10% to 90% RF, 90% to 10% RF
50% Control to 90% RF,
50% Control to 10% RF
RF Loss Difference within 30 µs to 500 µs
@ 2 GHz and 500 µs Pulse
In Band
2.0 GHz
2-Tone, +10 dBm/tone, 1 MHz Spacing
2.0 - 6.0 GHz
2-Tone, +10 dBm/tone, 1 MHz Spacing
2.0 - 6.0 GHz
V
DD
= 5V
Units
Min.
—
—
—
—
Typ.
1.3
1.6
2.0
2.5
Max.
—
2.3
—
—
Rev. V2
Reference Insertion Loss
dB
Attenuation Accuracy
VSWR
Trise, Tfall
Ton, Toff
Settling Time Loss Delta
(Gate Lag)
Transients
Input P1dB
IP
2
IP
3
I
DD
± (0.4 + 4% of attenuation setting) dB typ.
Ratio
ns
ns
dB
mV
dBm
dBm
dBm
µA
—
—
—
—
—
—
—
—
0
1.2:1
70
100
0.2
50
25
75
50
—
—
—
—
—
—
—
—
—
600
5. External DC blocking capacitors are required on all RF ports. Loss varies at 0.003 dB/°C.
Truth Table
6
VC16 VC8 VC4 VC2 VC1 VC0.5 Attenuation (dB)
1
1
1
1
1
1
0
0
1
1
1
1
1
0
1
0
1
1
1
1
0
1
1
0
1
1
1
0
1
1
1
0
1
1
0
1
1
1
1
0
1
0
1
1
1
1
1
0
Reference IL
0.5
1
2
4
8
16
31.5
Absolute Maximum Ratings
7,8
Parameter
Input Power
700 - 6000 MHz
Operating Voltage
Control Voltage
Operating Temperature
Junction Temperature
Storage Temperature
Absolute Maximum
+27 dBm
6V
-0.5 V < V
C
< 5.5 V
-40°C to +85°C
+150°C
-65°C to +150°C
6. 0 = 0 to 0.8V, 1 = 2 to 5V.
7. Exceeding any one or combination of these limits may cause
permanent damage to this device.
8. M/A-COM Technology Solutions does not recommend
sustained operation near these survivability limits.
2
M/A-COM 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
MAAD-000523
Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.7 - 6.0 GHz
Typical Performance Curves
Insertion Loss
0
Rev. V2
Relative Attenuation across all major states
0
-5
-10
-1
-2
-15
-20
+25°C
-40°C
+85°C
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
-3
-25
-30
-35
-4
-5
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Frequency (GHz)
Frequency (GHz)
Input Return Loss, across all attenuation states
0
-5
-10
-15
-20
-25
-30
-35
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
Output Return Loss, across all attenuation states
0
-5
-10
-15
-20
-25
-30
-35
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
Frequency (GHz)
Frequency (GHz)
Step Error vs. State over Frequency
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
0
4
8
- - - - +/- (0.3 + 3%ATT) dB
- - - - +/- (0.3 + 4%ATT) dB
0.7 GHz
1 GHz
2 GHz
3 GHz
4 GHz
5 GHz
6 GHz
IP3
80
70
60
50
40
12
16
20
24
28
32
30
0
1
2
3
4
5
6
7
8
State (dB)
Frequency (GHz)
3
M/A-COM 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
MAAD-000523
Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.7 - 6.0 GHz
Typical Performance Curve:
Relative Phase Variation vs. Frequency and all states
40
30
20
10
0
-10
-20
-30
-40
-50
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Rev. V2
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.
Frequency (GHz)
Lead Free 4
mm 24-Lead PQFN
†
†
Reference Application Note S2083 for lead-free solder reflow recommendations.
M/A-COM 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
MAAD-000523
Digital Attenuator, 6-Bit, Serial / Parallel Control
31.5 dB, 0.7 - 6.0 GHz
Functionality
Modes of Operation: Serial, Direct Parallel, and Latched Parallel
Mode Truth Table
P/S
1
0
0
LE
X
Constant High
Pulsed
Mode
Serial
Direct Parallel
Latched Parallel
Rev. V2
Serial 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 the 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.
For all modes of operations, the outputs will stay constant while LE is kept low.
Direct Parallel Mode
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.
Latched Parallel 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 V
CC
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.
5
M/A-COM 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.
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