FEATURES

? JEDEC JESD204B and JESD204C support

? Low additive jitter: <15 fs rms at 2457.6 MHz (12 kHz to 20 MHz)

? Very low noise floor: ?155.2 dBc/Hz at 983.04 MHz

? Up to 14 low-voltage differential signaling (LVDS), low-voltage

positive emitter coupled logic (LVPECL), or current-mode logic

(CML) type device clocks (DCLKs)

? Maximum CLKOUTx/CLKOUTx and SCLKOUTx/SCLKOUTx

frequency of 3200 MHz

? JESD204B/C compatible system reference (SYSREF) pulses

? 25 ps analog and one-half clock input cycle digital delay independently

programmable on each of 14 clock output channels

? Serial port interface (SPI)-programmable adjustable noise floor

vs. power consumption

? SYSREF valid interrupt to simplify JESD204B/C synchronization

? Supports deterministic synchronization of multiple HMC7043B

devices

? RFSYNCIN pin or SPI-controlled SYNC trigger for output synchronization

of JESD204B/C

? GPIO alarm/status indicator to determine system health

? Clock input to support up to 6 GHz

? Available in 48-lead, 7 mm × 7 mm LFCSP package

APPLICATIONS

? JESD204B and JESD204C clock generation

? Cellular infrastructure (multicarrier global system for mobile communications/

GSM, long-term evolution/LTE, wideband Code-Division

Multiple Access/W-CDMA)

? Data converter clocking

? Phase array reference distribution

? Microwave baseband cards

GENERAL DESCRIPTION

The HMC7043B, which is a revised version of the HMC7043, is a

high-performance clock buffer for the distribution of ultra-low phase

noise references for high-speed data converters with either parallel

or serial (JESD204B/C type) interfaces.

The HMC7043B is designed to meet the requirements of multicarrier

GSM and LTE base station designs, and offers a wide range of

clock management and distribution features to simplify baseband

and radio card clock tree designs.

The HMC7043B provides 14 low noise and configurable outputs

to offer flexibility in interfacing with many different components in

a base transceiver station (BTS) system, such as data converters,

local oscillators, transmit/receive modules, field programmable gate

arrays (FPGAs), and digital front-end application-specific integrated

circuits (ASICs). The HMC7043B can generate up to seven DCLK

and SYSREF clock pairs per the JESD204B interface requirements.

The system designer can generate a lower number of DCLK and

SYSREF pairs, and configure the remaining output signal paths

for independent phase and frequency. Both the DCLK and SYSREF

clock outputs can be configured to support different signaling

standards, including CML, LVDS, LVPECL, and low voltage complementary

metal-oxide semiconductor (LVCMOS), and different bias

conditions to adjust for varying board insertion losses.

One of the unique features of the HMC7043B is the independent

flexible phase management of each of the 14 channels. All 14

channels feature both frequency and phase adjustment. The outputs

can also be programmed for 50 Ω or 100 Ω internal and

external termination options.

The HMC7043B device features an RF SYNC feature that synchronizes

multiple HMC7043B devices deterministically, that is, ensures

that all clock outputs start with the same edge. This operation is

achieved by rephasing the nested HMC7043B or SYSREF control

unit/divider, deterministically, and then restarting the output dividers

with this new phase.

The HMC7043B is offered in a 48-lead, 7 mm × 7 mm LFCSP

package with an exposed pad connected to ground.