8V97051 Low Power Wideband Fractional RF Synthesizer

This design features a low power wideband RF synthesizer that is used in GSM receiver cards. It has dual differential and open drain outputs with frequency range of 34.375MHz to 4400MHz(in continuous range). The logic compatibility is 1.8V while the system is running on a single 3.3V supply. It has -143dBc/Hz Phase Noise (PN) performance at 1MHz Offset for every 1.1GHz output. It is also capable of mute function at RF_OUT that is accessible via mute pin or SPI command. It is low power with only 380mW average power consumption while RF_OUTB is not in used.

The design is comprised of 3 major parts. The first part consists of IDT8V97051NLGi wideband RF synthesizer/PLL supports the output frequencies with Voltage Controlled Oscillator (VCO). The temperature compensated crystal oscillator close to the RF input helps in the precision of signal while the other parts are filters that are used in various purposes like minimizing undesired noise. The second part consists of the USB 2.0 high speed to UART/FIFO IC that is used for system interface while the I2C-bus to SPI bridge IC controls the sequences, protocol, and timing of the signal. The last part is power supply management of the system in which it is provided with RC filters in every line to ensure minimal noise are included in the supply.

The design is applicable in multi-carrier, multi-mode Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) base station radio card. It optimizes multi-service base stations during its service as a local oscillator that generates a large variety of frequencies to mixers while maintaining excellent PN.

8V97051 Low Power Wideband Fractional RF Synthesizer – [Link]



Maximo Robot Arm – for kids and even big kids


The Maximo Robot Arm is the greatest way to discover robotics. Accessible, fun and affordable, Maximo is designed for everyone.

Maximo Robot Arm comes with a laser-cut acrylic body. It was designed to offer the highest quality while remaining one of the most affordable robotic arms on the market. Its 5-axis range of motion allows for movements similar to assembly line robots.

Maximo is our second generation of robotic arms. Three years ago, we created MandleBot, a 5-axis aluminum robotic arm currently being used in schools, robotics clubs, summer camps and even factories. We have enjoyed sharing our passion for robotics with a lot of people and it has inspired us to now do it on a larger scale.

Maximo Robot Arm – for kids and even big kids – [Link]

LT3091 – –36V, 1.5A Negative Linear Regulator with Programmable Current Limit


The LT®3091 is a 1.5A, low dropout negative linear regulator that is easily paralleled to increase output current or spread heat on surface mounted boards. Designed with a precision current reference followed by a high performance rail-to-rail voltage buffer, this regulator finds use in applications requiring precision output, high current with no heat sink, output adjustability to zero and low dropout voltage. The device can also be configured as a 3-terminal floating regulator.

LT3091 – –36V, 1.5A Negative Linear Regulator with Programmable Current Limit – [Link]


Open source pocket USB oscilloscope; 30 MHz, multi-platform


by Graham Prophet @ edn-europe.com:

Running on Apple iPad, Android, Microsoft Windows and Linux, LabNation’s (Antwerp, Belgium) open source USB oscilloscope, SmartScope, is the result of a Kickstarter campaign commenced in 2014 – the project raised 645% of the funding goal within 30 days.

Believed to be the first test equipment designed to run on multiple operating systems and platforms such as smartphones, tablets and PCs, the lightweight SmartScope is powered directly from the host’s USB interface suiting it for many test and measurement applications far from the workbench.

Open source pocket USB oscilloscope; 30 MHz, multi-platform – [Link]

RePhone kit: World’s first open source and modular phone


Seeed Studio has announced that RePhone, an open source and modular phone kit:

With Rephone you can:
1.Create your own phone in minutes with the slim MODULES, accessible SOFTWARE, and customizable Phone Enclosures.
2.Hack anything around you, giving inanimate objects the power of cellular communication. Have a conversation with your pets, plants, toys, motorcycle helmets, robots, or drones through RePhone’s GSM and 3G functions.

RePhone is a set of tools and components that allows everyone including students, teachers, makers, hackers, geeks, artists, developers and engineers rethink, remix, redesign and remake the phone.
RePhone comes in three kits RePhone Core Module GSM + BLE, RePhone Core Module 3G and RePhone kit Create.

RePhone kit: World’s first open source and modular phone – [Link]

HC-SR04 Ping Sensor Hardware Mod


by cascologix.com:

HC-SR04 ultrasonic sensor modules, also commonly called ping sensors, are practically a dime a dozen, with many Asia online retailers selling them in the $2 to $3 dollar range each. While possibly not intended for an end solution or product, these sensors offer a more affordable option for prototyping and application development compared to the original and possibly more well-known ping sensor sold by Parallax, or transducers sold by Maxbotix.

HC-SR04 Ping Sensor Hardware Mod – [Link]

EEVblog #797 – Siglent SDS1000X Oscilloscope Review

In a world first Dave takes an initial first impressions look at the new Siglent 1000X Series 200MHz entry level oscilloscope. What do you get for US$499?
How does it compare to the Rigol DS2000 Series?

EEVblog #797 – Siglent SDS1000X Oscilloscope Review – [Link]

Power Management Solutions: Battery Chargers


Maurizio @ dev.emcelettronica.com writes:

Out of all portable devices, the most numerous are the mobile phones (Figure 1). Most of them feature Li-ion or Li-polymer accumulators and Freescale has a broad range of charger ICs dedicated to supporting all the phases of a complete recharge cycle. Generally speaking the charging of a mobile phone is performed by taking energy from:

a) from a wall outlet
b) from the USB port of a computer
c) from the 12V output of a vehicle

Power Management Solutions: Battery Chargers – [Link]

1A from the sugar cube sized module


With continuous improvement TRACO unveils the SMD version of enormously successful 1A DC/DC converter, the TSR1SM.

The TSR1SM series models of step-down switching regulators (non isolating – POL) have a high efficiency up to 96 % which allows full load operation up to +65°C ambient temperature without the need of any heat transmission layer. Excellent output voltage accuracy (±2%) and low standby current (~1 μA) are features that distinguish these switching regulators from linear regulators.To make a SMD version of such a DC/DC converter is not a simple task, the package should withstand temperatures up to 245°C, used in a lead free soldering ovens. TRACO solved successfully this problem and the TSR1SM is qualified for lead free soldering processes as per J-STD-020D.01 (to find at: www.jedec.org – free registration required) with max. peak body temperature 245°C. Also low MSL level 1 allows PCB washing after soldering with baking at 100°C for 30min.

For applications which require lower supply currents up to 0,5Amps, there is a TSR0,5(SM)series of DC/DC converters with better price level available.

1A from the sugar cube sized module – [Link]

8T49NS010 Clock Synthesizer and Fanout Buffer/Divider

This reference design features the 8T49NS010 integrated circuit that functions as a clock synthesizer with a built-in fanout buffer and divider. By using an external clock source or a crystal, the 8T49NS010 can generate high performance timing geared towards the communications and datacom markets, especially for applications demanding extremely low phase noise jitter, such as 10, 40 and 100GE. Depending on the input used, the 8T49NS010’s low phase noise integer-N PLL can multiply the reference to 2400MHz or 2500MHz.

The device offers ten clock outputs (QCLK[9:0]/nQCLK[9:0]). Each output can be disabled individually through registers. With ÷2, ÷4, ÷8 and ÷16 values one can get output frequencies of 156.25MHz, 312.5MHz, 625MHz and 1250MHz when driven from a 25MHz input, for example. The input select pin REF_SEL will choose either XTAL input or CLK_IN input will be used and this pin also set the pre-divider PRE to either x2 or ÷1. The feedback divider FB_SEL pin will set the feedback divider to either ÷50, ÷25. The feedback divider should be properly set to assure the PLL lock for VCO=2.5GHz. The N1 and N0 are pins for output frequency divider setting. Aside from the divider values that can be set using pins N1 and N0, additional divider values are available through registers that can be programmed with I2C interface. This reference design recommends the FT2232 USB to UART converter to program the device divider value via I2C pins. The 8T49NS010 operates over the industrial temperature range of -40°C to +85°C with a 3.3V supply voltage.

The 8T49NS010 provides versatile frequency configurations and output format that is optimized to deliver excellent phase noise performance. The device delivers an optimum combination of high clock frequency and low phase noise performance, combined with high power supply noise rejection.

8T49NS010 Clock Synthesizer and Fanout Buffer/Divider – [Link]