HMC542LP4
/
542LP4E
v03.0809
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 3 GHz
5
ATTENUATORS - DIGITAL - SMT
Typical Applications
The HMC542LP4(E) is ideal for:
• Cellular/PCS/3G Infrastructure
• ISM, MMDS, WLAN, WiMAX, & WiBro
• Microwave Radio & VSAT
• Test Equipment and Sensors
Features
0.5 dB LSB Steps to 31.5 dB
TTL/CMOS Compatible Serial Data Interface
SPI Compatible Serial Output
± 0.25 dB Typical Step Error
Single +5V Supply
24 Lead 4x4mm QFN Package: 16mm2
Functional Diagram
General Description
The HMC542LP4(E) is a broadband 6-bit GaAs IC
digital attenuator with a CMOS compatible serial
to parallel driver in low cost leadless surface mount
package. This serial control digital attenuator incorp
rates off chip AC ground capacitors for near DC opera-
tion, making it suitable for a wide variety of RF and IF
applications. Covering DC to 3 GHz, the insertion loss
is 1.5 dB and the attenuator bit values are 0.5 (LSB),
1, 2, 4, 8, and 16 dB for a total attenuation of 31.5 dB.
Attenuation accuracy is excellent at ±0.25 dB typi-
cal step error with an IIP3 of +45 dBm. Six bit serial
control words are used to select each attenuation
state. A single Vdd bias of +5V is required.
Electrical Specifi cations,
T
A
= +25° C, with Vcc = +5V
Parameter
Insertion Loss
Attenuation Range
Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
0.5 - 3.5 dB States
4.0 - 31.5 dB States
All Attenuation States
Input Power for 0.1 dB Compression
Input Third Order Intercept Point
(Two-Tone Input Power= 0 dBm Each Tone)
Switching Characteristics
DC - 3 GHz
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
800
900
ns
ns
Frequency (GHz)
DC - 1.5 GHz
1.5 - 3.0 GHz
DC - 3 GHz
DC - 3 GHz
Min.
Typ.
1.2
1.5
31.5
17
Max.
1.5
1.8
Units
dB
dB
dB
dB
DC - 1.0 GHz
1.0 - 2.2 GHz
1.0 - 2.2 GHz
2.2 - 3.0 GHz
0.1 - 3.0 GHz
0.1 - 1.5 GHz
1.5 - 3.0 GHz
± (0.20 + 3% of Atten. Setting) Max.
± (0.25 + 3% of Atten. Setting) Max.
± (0.15 + 4% of Atten. Setting) Max.
± (0.30 + 3% of Atten. Setting) Max.
20
35
45
dB
dB
dB
dB
dBm
dBm
dBm
5 - 198
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC542LP4 / 542LP4E
v03.0809
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 3 GHz
Return Loss RF1, RF2
Insertion Loss
0
-0.5
INSERTION LOSS (dB)
RETURN LOSS (dB)
-1
-1.5
-2
-2.5
-3
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
+25 C
+85 C
-40 C
(Only Major States are Shown)
0
-5
-10
-15
-20
-25
-30
-35
-40
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
31.5 dB
0.5-16 dB
5
ATTENUATORS - DIGITAL - SMT
Normalized Attenuation
(Only Major States are Shown)
0
NORMALIZED ATTENUATION (dB)
-5
Bit Error vs. Attenuation State
1
0.8
0.6
BIT ERROR (dB)
-10
-15
-20
-25
-30
-35
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
4
40 MHz
3 GHz
1 GHz
500 MHz
2 GHz
100 MHz
8
12
16
20
24
28
32
ATTENUATION STATE (dB)
Bit Error vs. Frequency
(Only Major States are Shown)
2
1.5
1
BIT ERROR (dB)
0.5
0
-0.5
-1
16 dB
0.5-8B
31.5 dB
Relative Phase vs. Frequency
(Only Major States are Shown)
80
60
RELATIVE PHASE (deg)
40
20
0
-20
0.5-4 dB
31.5 dB
16 dB
8 dB
-1.5
-2
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
-40
0
0.5
1
1.5
2
2.5
3
3.5
4
FREQUENCY (GHz)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
5 - 19
HMC542LP4 / 542LP4E
v03.0809
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 3 GHz
5
ATTENUATORS - DIGITAL - SMT
Worst Case Step Error
Between Successive Attenuation States
1
0.8
0.6
STEP ERROR (dB)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0
0.5
1
1.5
2
2.5
3
3.5
4
Digital Control Voltages
State
Low
High
Vcc = +5V
0 to 1.3V
3.5 to 5V
Serial Input Truth Table
Latch
Enable
X
X
Shift
Clock
X
X
Reset
L
H
H
Function
Shift register cleared
Shift register clocked
Contents of shift register
transferred to Digital
Attenuator
FREQUENCY (GHz)
Timing
Symbol
Parameter
Min.
Serial Input Setup Time
Hold time from Serial
Input to Shift Clock
Setup time from Shift
Clock to Latch Enable
Latch Enable Window,
Latch Enable to C0.5
through C8
Setup time from Reset to
Shift Clock
Clock Frequency
(1/tclk)
ts
th
tlsup
20
0
40
Max.
-
-
-
ns
ns
ns
Vcc = +5V
Units
Truth Table
Control Voltage Input
C16
High
High
High
High
High
tpd
-
30
ns
High
Low
-
fclk
20
-
-
30
ns
MHz
Low
C8
High
High
High
High
High
Low
High
Low
C4
High
High
High
High
Low
High
High
Low
C2
High
High
High
Low
High
High
High
Low
C1
High
High
Low
High
High
High
High
Low
C0.5
High
Low
High
High
High
High
High
Low
Reference
I.L.
0.5 dB
1 dB
2 dB
4 dB
8 dB
16 dB
31.5 dB
Any combination of the above states will provide an attenuation
approximately equal to the sum of the bits selected.
Timing Diagram
5 - 200
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
HMC542LP4 / 542LP4E
v03.0809
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 3 GHz
Logic / Functional Diagram
5
ATTENUATORS - DIGITAL - SMT
Programming Example to Select 16 dB Attenuation State
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
5 - 20
HMC542LP4 / 542LP4E
v03.0809
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL
SERIAL CONTROL ATTENUATOR, DC - 3 GHz
5
ATTENUATORS - DIGITAL - SMT
Pin Descriptions
Pin Number
1, 3, 5, 14,
16-18, 23
Function
N/C
Description
The pins are not connected internally; however, all data
shown herein was measured with these pins connected to
RF/DC ground externally.
Interface Schematic
2
Vcc
Supply Voltage.
4, 15
RF1, RF2
This pin is DC coupled and matched to 50 Ohms
Blocking capacitors are required. Select value based on
lowest frequency of operation.
External capacitor to ground is required. Select value for
lowest frequency of operation. Place capacitor as close to
pins as possible.
This pin is not connected internally and any connection made
to it externally will have no effect on product performance.
6 - 11, 13
ACG1 - ACG7
12
N/C
19
Serial Output
Serial data output. Serial input data
delayed by 8 clock cycles
20
21
22
Reset
Shift Clock
Latch Enable
See truth table, control voltage table and timing diagram.
24
Serial Input
GND
Package bottom has an exposed metal paddle
that must be connected to RF/DC Ground.
5 - 202
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
stm32/stm8
