LMX2470
- Low In-Band Phase Noise and Low Fractional Spurs
- 12 Bit or 22 Bit Selectable Fractional Modulus
- Up to 4th Order Programmable Delta-Sigma Modulator
- Enhanced Anti-Cycle Slip Fastlock
Circuitry
- Fastlock
- Cycle Slip Reduction
- Integrated Timeout Counters
- Digital Lock Detect Output
- Prescalers Allow Wide Range of N Values
- RF PLL: 16/17/20/21
- IF PLL: 8/9 or 16/17
- Crystal Reference Frequency up to 110 MHz
- On-chip Crystal Reference Frequency Doubler.
- Phase Comparison Frequency up to 30 MHz
- Hardware and Software Power-down Control
- Ultra Low Consumption: ICC = 4.1 mA (Typical)
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The LMX2470 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using TI’s advanced BiCMOS process.
With delta-sigma architecture, fractional spur compensation is achieved with noise shaping capability of the delta-sigma modulator and the inherent low pass filtering of the PLL loop filter. Fractional spurs at lower frequencies are pushed to higher frequencies outside the loop bandwidth. Unlike analog compensation, the digital feedback techniques used in the LMX2470 are highly resistant to changes in temperature and variations in wafer processing. With delta-sigma architecture, the ability to push close in spur and phase noise energy to higher frequencies is a direct function of the modulator order. The higher the order, the more this energy can be spread to higher frequencies. The LMX2470 has a programmable modulator up to order four, which allows the designer to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.
Programming is fast and simple. Serial data is transferred into the LMX2470 via a three line MICROWIRE interface (Data, Clock, Load Enable). Nominal supply voltage is 2.5 V. The LMX2470 features a typical current consumption of 4.1 mA at 2.5 V. The LMX2470 is available in a 24 lead 3.5 X 4.5 X 0.6 mm package.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 |
|---|---|---|---|---|---|
| * | 데이터 시트 | LMX2470 2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N PLL datasheet (Rev. B) | 2013. 3. 6 | ||
| 애플리케이션 노트 | AN-1879 Fractional N Frequency Synthesis (Rev. B) | 2021. 11. 18 | |||
| 사용 설명서 | USB Interface Board for use with LMK and LMX User Guide | 2012. 1. 27 | |||
| 사용 설명서 | 2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N PLL | 2012. 1. 26 | |||
| 애플리케이션 노트 | Delta Sigma PLLs Raise The Standard For Performance | 2003. 3. 5 |
설계 및 개발
추가 조건 또는 필수 리소스는 사용 가능한 경우 아래 제목을 클릭하여 세부 정보 페이지를 확인하세요.
CODELOADER — CodeLoader Device Register Programming v4.19.0
The CodeLoader 4 software is used to program the LMX PLLs and LMK timing devices through either the USB or line print terminal (LPT) port of a computer. This software also provides information on how to program the device by showing the bits that are actually sent.
Which software do I use?
Product | (...) |
PLLATINUMSIM-SW — PLL 루프 필터, 위상 잡음, 잠금 시간, 스퍼 시뮬레이션 툴
PLLATINUMSIM-SW는 사용자가 LMX 계열의 위상 고정 루프(PLL) 및 신시사이저를 포함하는 PLLatinum™ 집적 회로의 상세한 설계 및 시뮬레이션을 만들 수 있는 시뮬레이션 툴입니다.
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| ULGA (NPF) | 24 | Ultra Librarian |