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參數(shù)資料
| 型號： | UAA3515A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 900 MHz analog cordless telephone IC |
| 中文描述： | 900 MHz模擬無繩電話芯片 |
| 文件頁數(shù)： | 12/44頁 |
| 文件大小： | 180K |
| 代理商： | UAA3515A |
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2001 Dec 12
12
Philips Semiconductors
Product specification
900 MHz analog cordless telephone IC
UAA3515A
7.4
Synthesizer
The crystal local oscillator and reference divider (see
Fig.5) provide the reference frequency for the RX and TX
PLLs. The 10-bit reference divider is programmed with
respect to the crystal frequency and the desired RX and
TX frequencies. The microcontroller operating frequency
of 4.096 MHz is derived from a 16.384 MHz crystal
frequency. The clock divider ratio can be programmed to
1, 2, 2.5, 4 or to 128; ratio 128 is chosen in sleep mode to
save current in the microcontroller section. Clock output
(pin CLKOUT) is an emitter follower output.
The 16-bit TX counter is programmed for the desired
transmit channel frequency. Similarly, the 16-bit RX
counter is programmed for the desired local oscillator
frequency. The divider counter comprises a 6-bit prescaler
with division ratios (R) from 64 to 127, and a 10-bit CMOS
divider with division ratios (C) from 8 to 1023. The full
counter provides division ratios from 512 to 65535.
Settings of RX and TX counters are calculated as follows:
C = int
R = M
C
×
64
(where M is the division ratio between VCO frequency and
the reference frequency).
7.4.1
C
ALCULATION EXAMPLE
Given:
RF input frequency f
i(RF)
= 903 MHz
VCO RX f
VCO(RX)
= 892.3 MHz
f
IF
= 10.7 MHz
VCO TX f
VCO(TX)
= 925.6 MHz
Internal comparison frequency = 20 kHz
(f
XTAL
= 10.24 MHz)
We have:
Reference divider = 512 (1000000000)
C RX = 697 (1010111001) and R RX = 7 (000111)
and
C TX = 723 (1011010011) and R TX = 8 (001000)
VCOs and variable capacitance diodes are integrated.
Resonance inductors are shared between bonding wires,
leadframe of the package and external inductors. Costs
can be reduced by etching external inductors directly onto
the printed-circuit board.
An on-chip selectable voltage doubler is provided to
enable a larger tuning range of both VCOs. The phase
detectors have current drive type outputs with selection
possibilities between 400 and 800
μ
A.
64
-M
M RX
20
10
6
10
3
×
×
892.3
44615
=
=
M TX
20
10
6
10
3
×
×
925.6
46280
=
=
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| UAA3515AHL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:900 MHz analog cordless telephone IC |
| UAA3522 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power dual-band GSM transceiver with an image rejecting front-end |
| UAA3522HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power dual-band GSM transceiver with an image rejecting front-end |
| UAA3535 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power GSM/DCS/PCS multi-band transceiver |
| UAA3535HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low power GSM/DCS/PCS multi-band transceiver |
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