The description about Maxim Integrated MAX4950,MAX2051,MAX9860
Время публикации: 2019-02-13
SUNNYVALE, CA-May 26, 2009-Maxim Integrated Products (NASDAQ: MXIM) introduces two new re-drivers to support the industry's latest high-speed serial interfaces. The MAX4950 is a quad-channel buffer designed to re-drive PCI Express® (PCIe®) Gen I and Gen II signals (up to 5.0Gbps). The MAX4951 is a dual-channel (Tx and Rx) re-driver for SATA/eSATA Gen I (1.5Gbps), Gen II (3.0Gbps), and Gen III (6.0Gbps) signals. These protocol-specific re-drivers are intended for use in storage and computing applications that carry signals over long traces, through passive backplanes and connectors, and then over long cables to either an internal or an external storage device.
High-speed serial interfaces such as serial ATA/external serial ATA (SATA/eSATA) and PCIe have now become the de facto standards for transferring and storing data in consumer, industrial, and medical applications.
While PCIe and SATA/eSATA have existed for several years, each respective protocol is now in its second or third generation and is operating at two or more times its original speed. Each protocol typically operates at low signal levels. Meanwhile, low-cost PC boards are becoming densely populated, requiring thinner and longer board traces. This is creating the need for low-loss, high-bandwidth switches and re-drivers to counter the losses and jitter otherwise introduced to the system.
The MAX4951 is the dual-channel (Tx and Rx) re-driver for the SATA/eSATA Gen I, Gen II, and Gen III standards. The device preserves signal integrity at the receiver by reestablishing full output levels. It reduces total system jitter (TJ) by establishing a near perfect match and squaring the signal.
The MAX4951 supports SATA out-of-band (OOB) signaling by using high-speed amplitude detection and squelch. Input signals of 50mVP-P or less are detected as off and not passed to the output; signals of 150mVP-P or greater are detected as on and passed through the output. This approach prevents the system from responding to unwanted noise, while still allowing OOB signals to transmit through the MAX4951.
The MAX4951 features a selectable boost to compensate for attenuation from longer trace length cables and to meet SATA/eSATA eye-diagram specifications. The boost programmability is implemented through two integrated, digitally controlled logic inputs to select boost on either channel. The device also features a lower power operation mode. An integrated enable input is used to select the mode of operation. When enable is driven low, the MAX4951 goes into a low-power standby mode, thus reducing power consumption in the application.
Maxim's MAX4950 quad-channel buffer is designed to re-drive PCIe Gen I and Gen II signals. To protect against unwanted noise at the output, the MAX4950 integrates four programmable signal-amplitude buffers, each of which features electrical idle and receive detection. To further preserve signal integrity, the device's programmable input equalization and programmable output deemphasis compensate for circuit-board loss while redriving high-speed signals at PCIe Gen I and Gen II data rates. The MAX4950 is designed for desktops, workstations, and servers that must carry signals through connectors and/or over long cables, midplane stripline, or microstrip on circuit boards while maintaining signal integrity throughout the system.
The MAX4950 also features a power-save mode to reduce quiescent supply current. Power-save mode reduces power consumption in applications where all channels operate simultaneously. To activate the power-save mode, simply drive the P_SAV pin high; drive the pin low to return to normal mode of operation. An enable pin can be driven low to place the device in standby mode, which further reduces power consumption in the system. The MAX4950 is transparent to the system, allowing for multiple possible placements (e.g. near or far from the host, or in-between), and lane recognition by the system.
Both the MAX4950 and the MAX4951 re-drivers operate from a single 3.3V supply, and are fully specified over the 0°C to +70°C commercial temperature range. The MAX4950 is priced at $6.00, and the MAX4951 at $1.50 (1000-up, FOB, USA). Contact the factory for ordering and sampling information.
SUNNYVALE, CA-May 28, 2009-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX2051, the industry's highest performance, fully integrated, 850MHz to 1550MHz SiGe passive mixer. Designed specifically for multicarrier cable head-end downstream video, cable modem termination systems (CMTS), video-on-demand and DOCSIS®-compliant edge QAM modulation, and wireless-infrastructure applications, the MAX2051 delivers an unparalleled combination of linearity and spurious suppression over an exceptionally wide IF bandwidth of 50MHz to 1000MHz. When configured as a downconverter, this single IC provides 35dBm of IIP3, 24dBm of IP1dB, 7.4dB of conversion loss, and a 7.8dB noise figure. In addition, it exhibits outstanding levels of 2 x 1, 2 x 2, and 3 x 3 spurious suppression, with typical values of 88dBc, 79dBc, and 101dBc (with a -14dBm input level), respectively, over the entire 50MHz to 1000MHz IF band. Its high linearity and excellent spurious suppression are critical for ensuring DOCSIS-compliant transmission into the 50MHz to 1000MHz spectrum in cable head-end systems.
As an upconverter, the MAX2051 delivers equally impressive performance with 33.4dBm of IIP3, a low conversion loss of only 7.5dB, and better than 61dBc of LO ±2IF and 78dBc of LO ±3IF suppression. This device is ideal for all point-to-point and point-to-multipoint microwave and fixed broadband wireless-access base-station applications, which require first IF to second IF upconversion stages covering the 850MHz to 1550MHz band.
Maxim's proprietary SiGe process enables the MAX2051 to integrate a state-of-the-art, double-balanced mixer core with an LO amplifier, two baluns, plus dozens of discrete components-all into one monolithic device. When compared to the closest competing solution, the MAX2051 reduces the total board space by 72%, and reduces the discrete part count by 25%. The device's outstanding spurious performance also eases the filtering requirements of close-in harmonics, thus enabling simpler, smaller, and more cost-effective filter designs.
To complement the mixer's exceptionally wide IF range, the MAX2051 includes a similarly wide-range LO buffer circuit that is optimized for high-side LO injection architectures covering the 1200MHz to 2250MHz frequency spectrum. The on-board 0dBm drive LO buffer provides ±3dB drive-variance control, thus ensuring stable gain, NF, and IIP3 performance over temperature, supply, and input power. The MAX2051 also has excellent gain-variation performance of 0.01dB/°C over the -40°C to +85°C industrial temperature range.
SUNNYVALE, CA-May 12, 2009-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX9860, a low-power, mono audio codec with dual ADC paths and programmable digital voice filters. The device employs a flexible clocking scheme that utilizes common system-clock frequencies ranging from 10MHz to 60MHz, thereby eliminating the need for an external PLL and multiple crystal oscillators. The MAX9860 is ideal for voice headsets, digital cameras, cell phones, portable recorders, VoIP telephones, and conference phones.
The MAX9860 includes two differential microphone inputs with a user-programmable preamplifier and programmable gain amplifier. Automatic gain control with selectable attack/release times and a signal threshold allows maximum dynamic range. A noise gate with a selectable threshold helps quiet the audio channel when no signal is present. This configuration allows the user to select one channel for voice, while the other channel can be converted and processed downstream for echo-noise canceling and background noise.
The programmable digital voice filters provide full attenuation for out-of-band signals, as well as a 5th-order, GSM-compliant digital highpass filter. An elliptical digital filter notches the 217Hz (GSM) frequency for 8kHz and 16kHz sample rates. Also, an available digital side-tone mixer provides loopback of the ADC signal (microphones) to the DAC output (headphone) in the case of a headset application.
The analog output is a bridge-tied-load (BTL), mono headphone amplifier. The MAX9860 can output 30mW into a 32Ã(TM) earpiece while operating from a single 1.8V power supply. This low-voltage operation translates into low power consumption that makes the MAX9860 the ideal choice for battery-powered applications.
The MAX9860 includes two serial data interfaces. The ADC and DAC data is transferred over a flexible digital I²S-compatible interface that also supports TDM mode. General mode settings, including volume control, digital filters, and shutdown, are all programmed through a 2-wire, I²C-compatible interface.
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