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參數(shù)資料
| 型號(hào)： | UMA1016BT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | XO, clock |
| 英文描述： | Frequency synthesizer for radio communication equipment |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 800 MHz, PDSO16 |
| 封裝： | 3.90 MM, PLASTIC, MS-012AC, SOT-109-1, SOP-16 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 85K |
| 代理商： | UMA1016BT |
1995 Jul 12
12
Philips Semiconductors
Product specification
Frequency synthesizer for
radio communication equipment
UMA1016xT
APPLICATION INFORMATION
In a typical single-synthesizer application, the circuit is
connected as shown in Fig.6. Both analog and digital
supplies are decoupled to ground with HF and LF filter
capacitors. Correct oscillator operation requires capacitors
both to ground and to provide feedback across the
amplifier. Five signals are shown fed from a
microcontroller to provide serial programming, control
TDD frequency selection and initiate the power-down
mode. Other system logic may also be clocked by a crystal
frequency output from the synthesizer.
A passive 2nd-order loop filter giving a 3rd-order system
response is shown in Fig.6. Indicated values are intended
for rapid frequency switching (500
μ
s), 200 kHz channel
spacing (reference
÷
27) and breakthrough levels below
60 dB. The VCO output shows a power splitter supplying
both the synthesizer RF input and drive buffer for other
system components (RF amplifier in transmit mode, input
mixer in receive mode). The minimizing of loop filter node
leakage currents requires careful board layout.
Fig.6 Application diagram.
handbook, full pagewidth
MGA197 - 2
UMA1016XT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
P4
P3
P2
P1
P0
10
nF
47
μ
F
33
68 pF
33 pF
220
pF
5.4 MHz
REFCK
10 nF
VP
47
μ
F
VP
1
nF
VCO
12
12
RFout
100
82
330 pF
4.7
nF
18 k
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