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SL2610: 产品描述Wide Dynamic Range Image Reject MOPLL; 文件大小433KB，共27页; 制造商Zarlink Semiconductor (Microsemi); 官网地址http://www.zarlink.com/

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SL2610概述

Wide Dynamic Range Image Reject MOPLL

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SL2610

Wide Dynamic Range Image Reject MOPLL

Data Sheet

Features

•

Single chip mixer/oscillator PLL combination for

multi band tuner for DTT applications

Each mixer oscillator band optimized for wide

dynamic range

RF input stages allow for either single-ended or

differential drive

PLL frequency synthesizer designed for low

phase noise performance

Broadband output level detect with onset adjust

PLL frequency synthesizer compatible with

standard digital terrestrial offsets

Four integrated switching ports

C fast mode compliant

ESD protection (Normal ESD handling

procedures should be observed)

SL2610/IG/LH1Q

SL2610/IG/LH1N

SL2610/IG/LH2Q

SL2610/IG/LH2N

October 2004

Ordering Information

MLP

Tape & Reel, Bake & Drypack

Trays, Bake & Drypack

Tape & Reel, Bake & Drypack*

Trays, Bake & Drypack*

*Leadfree

-40°C to +85°C

Description

The SL2610 is a mixer oscillator intended primarily

for application in all band tuners, where it performs

image reject downconversion of the RF channel to a

standard 36 MHz or 44 MHz IF.

Each band consists of a low noise preamplifier/mixer

and local oscillator with an external varactor tuned

tank. The band outputs share a common low

impedance SAWF driver stage.

Frequency selection is controlled by the on-board I

bus frequency synthesizer. This block also controls

four general purpose switching ports for selecting the

prefilter/AGC stages.

Applications

•

Terrestrial digital receiver systems

Terrestrial analogue receiver systems

Cable receiver systems

Data communications systems

MID

BAND BAND BAND

CHARGE

PUMP

DRIVE

PROG

DIVIDER

SELECT

XTAL

XTALCAP

REF

DIVIDER

CONVOP

CONVOPB

IFIP

IFIPB

IFOP

IFOPB

AGC BIAS

AGC OUT

PORT P0

PORT P1

PORT P2

PORT P3

Port

Interface

SDA SCL ADD

MID

BAND BAND BAND

Figure 1 - SL2610 Block Diagram

Zarlink Semiconductor Inc.

Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.

SL2610

1.0

Functional Description

Data Sheet

The SL2610 is a multi band RF mixer oscillator with image reject and on-board frequency synthesizer. It is intended

primarily for application in all band terrestrial tuners and requires a minimum external component count. It contains

all elements required for RF downconversion to a standard IF with the exception of external VCO tank circuits.

The pin allocation is contained in Figure 2 and the block diagram in Figure 1.

1.1

Mixer/oscillator section

In normal application the RF input is interfaced to the selected mixer oscillator preamplifier through the tuner

prefilter and AGC stages. The mixer input is arranged such that the signal can be coupled either differentially or

single-ended, and achieves the specified minimum performance in both configurations. Band input impedances

and NF are contained in Figure 11 and Figure 12 respectively. The converter two tone input spectra are contained

in Figure 13 and Figure 14.

The preamplifier output then feeds the mixer stage where the required channel is image reject downconverted to

the IF frequency. The local oscillator frequency for the downconversion is obtained from the on board local

oscillator, which uses an external varactor tuned tank. Typical VCO applications are contained in Figures 8, 9 and

10.

The output of the mixer is then fed to the converter output driver which presents a matched 200

Ω

differential load

to an external IF shaping filter.

The output of the shaping filter is then coupled into the IFAMP stage, which provides further gain and offers a 50

Ω

output impedance to interface direct with the tuner SAW filter.

The SL2610 contains a broadband level detect circuit whose output can be used to control the tuner AGC. The

target level of the AGC detector is controlled by the voltage applied to the AGCBIAS pin. The characteristic of the

target level is given in Figure 18.

1.2

PLL Frequency Synthesizer

The PLL frequency synthesizer section contains all the elements necessary, with the exception of a frequency

reference and loop filter, to control a varicap tuned local oscillator, so forming a complete PLL frequency

synthesised source. The device allows for operation with a high comparison frequency and is fabricated in high

speed logic, which enables the generation of a loop with good phase noise performance. It can also be operated

with comparison frequencies appropriate for frequency offsets as required in digital terrestrial (DTT) receivers.

The LO signal is multiplexed from the selected oscillator section to an internal preamplifier which provides gain and

reverse isolation from the divider signals. The output of the preamplifier interfaces direct with the 15-bit fully

programmable divider which is of MN+A architecture, where the dual modulus prescaler is 16/17, the A counter is

4-bits and the M counter is 11 bits.

The output of the programmable divider is fed to the phase comparator where it is compared in both phase and

frequency domain with the comparison frequency. This frequency is derived either from the on-board crystal

controlled oscillator or from an external reference source. In both cases the reference frequency is divided down to

the comparison frequency by the reference divider which is programmable into 1 of 29 ratios as detailed in Table 1.

The output of the phase detector feeds a charge pump and loop amplifier section which when used with an external

loop filter integrates the current pulses into the varactor line voltage.

The programmable divider output Fpd, divided by two and the reference divider output Fcomp, can be switched to

port P0 by programming the device into test mode. The test modes are described in Table 5.

Zarlink Semiconductor Inc.

SL2610相似产品对比

	SL2610	SL2610IG	SL2610LH1N	SL2610LH1Q	SL2610LH2N	SL2610LH2Q
描述	Wide Dynamic Range Image Reject MOPLL	Wide Dynamic Range Image Reject MOPLL	Wide Dynamic Range Image Reject MOPLL	Wide Dynamic Range Image Reject MOPLL	Wide Dynamic Range Image Reject MOPLL	Wide Dynamic Range Image Reject MOPLL

SL2610

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