DSL line driver amp

24 November 2010 Analogue, Mixed Signal, LSI

Analog Devices has introduced a dual-port DSL line driver Class H amplifier for designers of high-speed ADSL2+/VDSL2 line cards. The ADLD8404’s small size (4 x 4 mm) allows telecommunications operators to increase the port density of their DSLAM (digital subscriber line access multiplexer) line cards.

The device consists of two differential, high-output current, low-power operational amplifiers. The driver incorporates AD’s patented Adaptive Linear Power technology, a technique that tracks ADSL2+/VDSL2 input signals on two channels simultaneously, and then dynamically selects the higher peak. By ensuring the tracking supply is always at the highest level, the new line driver eliminates clipped signals and distortion even when operating at the VDSL2 transmission frequencies of up to 17,6 MHz. The ADLD8404 integrates two charge pumps on-chip, allowing line card designers to cost-effectively support higher channel densities in multi-port DSLAM access concentrators that distribute broadband signals to hotels and large, multitenant commercial and residential buildings.

The line driver’s two differential DSL channels include current feedback and high-output current amplifiers with integrated resistors and biasing network. It operates from a single 14 V supply and features 20,4 dBm line power, 40 V p-p differential output voltage and low distortion: -65 dBc MTPR (multitone power ratio) at 20,4 dBm, operating 26 kHz to 2,2 MHz; and -55 dBc MTPR at 14,5 dBm, operating 5,2 MHz to 17,6 MHz.

For more information contact Stella Homan, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

Further reading:

High-speed PIN diode
Altron Arrow Analogue, Mixed Signal, LSI
Vishay’s new high-speed Silicon PIN diode is able to detect both visible and near infra-red radiation over a wide spectrum range from 350 to 1100 nm.

Read more...

---

Analogue front end for sensor measurements
Electrocomp Analogue, Mixed Signal, LSI
The NJU9103 AFE from Nisshinbo is a tiny analogue front end, with a 16-bit resolution ADC and up to 512 x signal amplification from the programmable gain amplifier.

Read more...

---

Single-channel software configurable I/O
Altron Arrow Analogue, Mixed Signal, LSI
These use cases of the AD74115H include analogue output and input, digital output and input, resistance temperature detector (RTD), and thermocouple measurement capability.

Read more...

---

Current-sense amplifier with PWM rejection
Altron Arrow Analogue, Mixed Signal, LSI
Analog Devices’ AD8410A is a high voltage, high bandwidth current-sense amplifier that features an initial gain of 20 V/V and a 2,2 MHz bandwidth.

Read more...

---

Combining a LPF and ADC driver for a 20 Vp-p signal
Altron Arrow Analogue, Mixed Signal, LSI
A mixed-signal ADC driver circuit’s optimum performance depends on multiple variables: the driver’s settling time, the RC filter’s time constant, driving impedance, and the ADC sampling capacitor’s kickback current, all interact during acquisition time and contribute towards sampling errors.

Read more...

---

Pressure sensor with NextNav certification
EBV Electrolink Analogue, Mixed Signal, LSI
STMicroelectronics’ LPS22DF pressure sensor has received a NextNav certification, which guarantees performance and reliability for geolocation and other types of applications.

Read more...

---

Reference design for Raspberry Pi analogue I/O
Analogue, Mixed Signal, LSI
Analogue Devices has published a reference design for ±10 V analogue input and ±15 V analogue output for Raspberry Pi platforms.

Read more...

---

Multi-zone distance sensor with 90° field of view
Avnet Silica Analogue, Mixed Signal, LSI
STMicroelectronics has revealed a new FlightSense multi-zone distance sensor, with 90° field of view, to bring lifelike situational awareness to applications like home automation, computers, robots, and smart equipment.

Read more...

---

Six-axis IMU with Qvar sensing channel
Altron Arrow Analogue, Mixed Signal, LSI
The LSM6DSV16X from STMicroelectronics is a high-performance, low-power six-axis IMU, featuring a three-axis digital accelerometer and a three-axis digital gyroscope.

Read more...

---

Bidirectional current-sense amplifier with PWM
RS South Africa Analogue, Mixed Signal, LSI
The MAX49925 from Analogue Devices is a bidirectional current-sense amplifier (CSA) with an input common-mode range that extends from -40 to 76 V, making it suitable for 48 V HEV applications where there are large automotive transients.

Read more...

---