HMC629LP4 Datasheet, PDF (3/8 Pages) Hittite Microwave Corporation – 3 dB LSB GaAs MMIC 4-BIT DIGITAL ATTENUATOR, DC - 6 GHz

HMC629LP4 / 629LP4E
v07.0410
3 dB LSB GaAs MMIC 4-BIT
DIGITAL ATTENUATOR, DC - 6 GHz
8
Step Error vs. Frequency
(Only Major States are Shown)
2
1.5
ALL BITS
1
0.5
0
-0.5
-1
BIT 24
-1.5
-2
0
2
4
6
FREQUENCY (GHz)
BIT (3, 6, 12)
8
10
Normal Relative Phase vs. Frequency
100
80
45 dB
60
24 dB
40
20
0
-20
-40
(3, 6, 12) dB
-60
-80
-100
0 1 2 3 4 5 6 7 8 9 10
FREQUENCY (GHz)
Serial Control Interface
The HMC629LP4E 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, 4-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, 4-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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