HMC708LP5 Datasheet, PDF (6/12 Pages) Hittite Microwave Corporation – 0.5 dB LSB 6-BIT DIGITAL VARIABLE GAIN AMPLIFIER, 1700 - 2200 MHz

HMC708LP5 / 708LP5E
v03.0409
0.5 dB LSB 6-BIT DIGITAL
VARIABLE GAIN AMPLIFIER, 1700 - 2200 MHz
Option 2 ^[1] : 6-Bit DAT + Amp2 only
Gain & Return Loss ^{[1] [2]}
20
15
S21
10
5
0
-5
S11
Vdd=3V
Vdd=5V
-10
-15
S22
-20
1.5 1.6 1.7 1.8 1.9 2 2.1 2.2 2.3 2.4 2.5
FREQUENCY (GHz)
Output IP3 vs. Attenuation @ 1900 MHz ^[1]
44
Pout=0dBm
40
36
Setup limit
32
28
Pout=-5dBm
24
Vdd=3V
Vdd=5V
20
0
4
8 12 16 20 24 28 32
ATTENUATION STATE (dB)
Serial Control Interface
The HMC708LP5(E) contains a 3-wire SPI compatible digital interface (SERIN, CLK, LE). It is activated when P/S
is kept high. The 6-bit serial word must be loaded MSB first. The positive-edge sensitive CLK and LE requires
clean transitions. Standard logic families work well. If mechanical switches were used, sufficient debouncing should
be provided. When LE is high, 6-bit data in the serial input register is transferred to the attenuator. When LE is high
CLK is masked to prevent data transition during output loading.
When P/S is low, 3-wire SPI interface inputs (SERIN, CLK, LE) are disabled and serial input register is loaded
asynchronously with parallel digital inputs (D0-D5). When LE is high, 6-bit parallel data is transferred to the
attenuator.
For all modes of operations, attenuation state will stay constant while LE is kept low.
13
[1] See Application Circuit [2] Maximum gain state with digital attenuator set to minimum attenuation
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]
Order On-line at www.hittite.com
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