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参数资料
| 型号： | HMC681LP5 |
| 厂商： | HITTITE MICROWAVE CORP |
| 元件分类： | 放大器 |
| 英文描述： | 0 MHz - 1000 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER |
| 封装： | 5 X 5 MM, LEADLESS, PLASTIC, SMT, QFN-32 |
| 文件页数： | 7/10页 |
| 文件大小： | 818K |
| 代理商： | HMC681LP5 |
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For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343
Fax: 978-250-3373
Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
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Serial Control Interface
the HmC681lp5(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. 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.
for all modes of operations, gain will remain constant while le is kept low.
serial Word
relative
gain
setting
b5
16 db
b4
8db
b3
4 db
b2
2 db
b1
1 db
b0
0.5 db
High
reference
0 db
High
low
-0.5 db
High
low
High
-1 db
High
low
High
-2 db
High
low
High
-4 db
High
low
High
-8 db
low
High
-16 db
low
-31.5 db
any combination of the above states will provide a relative gain
setting approximately equal to the sum of the bits selected.
Truth Table
HMC681LP5 / 681LP5E
v03.1010
0.5 dB LSB GaAs MMIC 6-BIT DIGITAL VARIABLE
GAIN AMPLIFIER w/ SERIAL CONTROL, DC - 1 GHz
parameter
typ.
min. serial period, t
sCK
100 ns
Control set-up time, t
Cs
20 ns
Control hold-time, t
CH
20 ns
le setup-time, t
ln
10 ns
min. le pulse width, t
leW
10 ns
min le pulse spacing, t
les
630 ns
serial clock hold-time from le, t
CKn
10 ns
Hold time, t
pH.
0 ns
latch enable minimum Width, t
len
10 ns
setup time, t
ps
2 ns
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