Datasheet > SP8853A

SP8853A

更新时间： 2024-09-22 22:50:11

品牌	Logo	应用领域
MITEL		/
页数	文件大小	规格书
14页	212K
描述
1·3GHz Professional Synthesiser

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数据手册

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SP8853A 数据手册

SP8853A/B

1·3GHz Professional Synthesiser

Supersedes March 1997 version, DS2352 - 3.0

DS2352 - 4.0 March 1998

The SP8853 is a low power single chip synthesiser

intended for professional radio applications, containing all the

elements(apartfromtheloopamplifier)requiredtobuildaPLL

frequency synthesis loop

The device is serially programmable by a three-wire data

highway and contains three independent buffers to store one

reference divider word and two local oscillator divider words.

A digital phase detector with two charge pumps,

programmable in phase and gain, are provided to improve

lock-up performance. The preset operation of the charge

pumps can be overwritten or the comparison frequencies

switched to output ports under control of the divider word. The

dual modulus ratio and so operating range is also

programmable through the same word.

28 27 26

PD2 OUTPUT

RPD

REF

POWER DOWN

V 3

GROUND

XTAL 1

XTAL2

SP8853

A power down mode is incorporated as a battery economy

feature.

RF INPUT

V 2

The SP8853 is specified at 1·3GHz at 255°C to1125°C (A

grade) and 240°C to185°C (B grade).

12 13 14 15 16 17 18

FEATURES

■ Improved Digital Phase Detector Eliminates

‘Dead Band’ Effects

■ Low Operating Power, Typically 175mW

■ 1·3GHz Operating Frequency

■ Complete Phase Locked Loop

■ High Input Sensitivity

■ Programmed throughThree-Wire Bus

■ Wide Range of Reference Division Ratios

■ Local Storage for Two Frequency Words, giving

Rapid Frequency Toggling

■ Programmable Phase Detector Gain

■ Power Down Mode

HC28

*F_PDand F_REFoutputs are reversed by the phase

detectorsensebitintheF1/F2programmingword. The

abovediagramiscorrectwhenthesensebitislow. See

Table 2 and Fig. 7.

_CC1, V_EE1 – preamplifier and prescaler supplies

_CC2, V_EE2 – oscillator supplies

_CC3, V_EE3 – charge pump 2 supplies

V_CC4, V_EE4 – ECL supplies

Fig. 1 Pin identification diagram (top view)

ABSOLUTE MAXIMUM RATINGS

ORDERING INFORMATION

SP8853/A/HC Military temperature range

SP8853/B/HC Industrial temperature range

Supply voltage

20·3V to 17V

255°C to 1150°C

2·5V p-p

Storage temperature

Prescaler input voltage

12 3 4 5 6 7...14

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