HMC291
/
291E
v02.0402
4 dB LSB GaAs MMIC 2-BIT DIGITAL
ATTENUATOR, 0.7 - 4.0 GHz
5
ATTENUATORS - SMT
Typical Applications
The HMC291 & HMC291E are ideal for:
• Cellular
• PCS, ISM, MMDS
• WLL Handset & Base Station
Features
RoHS Compliant Product
4 dB LSB Steps to 12 dB
Single Positive Control Per BIT, 0/+3V
±0.2 dB Typical Bit Error
Miniature SOT 26 Package: 9 mm
2
Included in the HMC-DK004 Designer’s Kit
Functional Diagram
General Description
The HMC291 & HMC291E are general purpose
broadband 2-bit positive control GaAs IC digital
attenuators in 6 lead SOT26 surface mount plastic
packages. Covering 0.7 to 4 GHz, the insertion loss
is typically less than 0.7 to 1.3 dB. The attenuator
bit values are 4 (LSB) and 8 dB for a total attenuation
of 12 dB. Accuracy is excellent at ± 0.2 dB typical
with an IIP3 of up to +54 dBm. Two bit control voltage
inputs, toggled between 0 and +3 to +5 volts, are
used to select each attenuation state at less than 50
uA each. A single Vdd bias of +3 to +5 volts applied
through an external 5K Ohm resistor is required.
Electrical Specifi cations,
T
A
= +25° C, Vdd = +3V to +5V & Vctl = 0/Vdd (Unless Otherwise Stated)
Parameter
Insertion Loss
Frequency
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 4.0 GHz
0.7 - 4.0 GHz
0.7 - 1.4 GHz
1.4 - 4.0 GHz
14
16
Min.
Typical
0.7
0.9
1.0
1.1
12
17
22
Max.
1.0
1.3
1.4
1.6
Units
dB
dB
dB
dB
dB
dB
dB
Attenuation Range
Return Loss (RF1 & RF2, All Atten. States)
Attenuation Accuracy: (Referenced to Insertion Loss)
All Attenuation States
All Attenuation States
All Attenuation States
All Attenuation States
Input Power for 0.1 dB Compression
5V
3V
5V
3V
0.7 - 1.4 GHz
1.4 - 2.3 GHz
2.3 - 2.7 GHz
2.7 - 4.0 GHz
0.7 - 4.0 GHz
± 0.3 + 3% of Atten. Setting Max
± 0.2 + 2% of Atten. Setting Max
± 0.2 + 3% of Atten. Setting Max
± 0.4 + 5% of Atten. Setting Max
26
22
54
50
dB
dB
dB
dB
dBm
dBm
dBm
dBm
Input Third Order Intercept Point
(Two-tone Input Power = 0 dBm Each Tone)
Switching Characteristics
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
0.7 - 4.0 GHz
0.7 - 4.0 GHz
560
600
ns
ns
5 - 46
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
HITTITE [ HITTITE MICROWAVE CORPORATION ]
