HMC624LP4_10 Datasheet, PDF (3/8 Pages) Hittite Microwave Corporation – 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL ATTENUATOR, DC - 6 GHz

v09.0210
HMC624LP4 / 624LP4E
0.5 dB LSB GaAs MMIC 6-BIT
DIGITAL ATTENUATOR, DC - 6 GHz
8
Worst Case Step Error
Between Successive Attenuation States ^[2]
IP3 vs. Temperature ^[2]
1
80
0.8
0.6
70
8 dB
0.4
0.2
60
0
-0.2
50
-0.4
4 dB
16 dB
-0.6
40
-0.8
-1
0
1
2
3
4
5
6
FREQUENCY (GHz)
30
0
1
2
3
4
5
6
FREQUENCY (GHz)
Serial Control Interface
The HMC624LP4E contains a 3-wire SPI compatible digital interface (SERIN, CLK, LE). The serial control interface
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. If mechanical switches are 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 the input register is loaded with
parallel digital inputs (D0-D5). When LE is high, 6-bit parallel data changes the state of the part per truth table.
For all modes of operations, the state will stay constant while LE is kept low.
8-3
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