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The LMX2487ESQ is a high-performance, low-power Delta-Sigma dual PLL frequency synthesizer ‌ for a wide range of communication and test devices.

Main characteristics

A fourfold mode pre-divider for low-frequency division

Radio frequency PLL: 16/17/20/21 or 32/33/36/37

IF PLL: 8/9 or 16/17

Advanced Delta Sigma Score Compensation

12-digit or 22-digit optional decimal modulus

Up to 4-order programmable Delta-Sigma modulator

The function of improving the lock time

Required Fastlock/Cycle Slip Reduction

Single-character writing

Integrated timeout counter

Wide working range

LMX2487E RF PLL: 3.0 GHz to 7.5 GHz

Useful function

Digital lock detection output

Hardware and software shutdown control

On-chip crystal reference frequency multiplier

The radio frequency phase comparison frequency is as high as 50 MHz

The working voltage ranges from 2.5V to 3.6V. At 3.0V, ICC = 8.5mA

These features make the LMX2487ESQ suitable for RF communication applications that require high-precision frequency synthesis.

Overview

The LMX2487ESQ device is a low-power, high-performance delta-sigma fractional N frequency division PLL with an auxiliary integer N frequency division PLL. It is manufactured using TI's advanced technology.

With the delta-sigma architecture, the decimal spurious at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push spurious and phase noise energy to higher frequencies is a direct function of the modulator order. Unlike analog compensation, the digital feedback technology used in the LMX2487ESQ has strong resistance to temperature changes and wafer processing variations. The LMX2487ESQ Δ-Σ modulator can be programmed up to the fourth order, which enables designers to select the optimal modulator order to meet the phase noise, spurring and lock-in time requirements of the system.

The serial data used for programming the LMX2487ESQ is transmitted through a three-wire high-speed (20-MHz) MICROWIRE interface. The LMX2487ESQ offers fine frequency resolution, low spurious behavior, fast programming speed, and single-word writing for frequency changes. This makes it highly suitable for direct digital modulation applications, where the n-counter is modulated directly using information. The LMX2487ESQ is available in a 24-pin 4.0 × 4.0 × 0.8mm WQFN package.

Main specifications

Product: LMX2487ESQ

Type: Phase-locked Loop - PLL

Number of circuits: 2 circuits

Maximum input frequency: 7.5 GHz

Minimum input frequency: 250 MHz

Output frequency range: 3 GHz to 7.5 GHz

Power supply voltage - Maximum: 3.6V

Power supply voltage - minimum: 2.5V

Technology: Si

Minimum operating temperature: -40 ° C

Maximum operating temperature: + 85 ° C

Installation style: SMD/SMT

Package/Box: WQFN-24

Application field

The LMX2487ESQ is widely used in the following fields:

Mobile phones and base stations

Direct digital modulation application

Satellite and cable TV tuners

WLAN standard

If you need to obtain the quotation of [LMX2487ESQ] related products, welcome to visit Mingjiada electronic official website www.hkmjd.com for consultation details.