LMH6881 and LMH6882 Programmable Differential Amplifiers – TI

Fri, Sep 21st, 2012. In IC, Chip, SoC, Signal Processing
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TI has introduced the LMH6881 and LMH6882 Programmable Differential Amplifiers (PDAs), which combine Fully-Differential Amplifiers (FDAs) and Digital Variable Gain Amplifiers (DVGAs).  The programmable gain control in the chips eliminates the need for gain-setting and adjustment resistors which are required by traditional Differential Amplifiers.


TI's Programmable Differential Amplifier (PDA)

TI's Programmable Differential Amplifier (PDA)


 

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Designing new devices with Programmable Differential Amplifiers significantly reduces design time, simplifying the design process and increases flexibility while reduce the PCB size and BOM (bill of materials). LMH6881 and LMH6882 PDAs enable robust system for broad range of  applications, such as wireless communications, microwave backhaul, test, instrumentation and measurement, medical, and military devices.

LMH6882 Programmable Differential Amplifier - Typical Application

LMH6882 Programmable Differential Amplifier - Typical Application

According to TI news release, LMH6881 and LMH6882 Programmable Differential Amplifiers offer more consistent noise and distortion performance over the entire gain range, compared to traditional DVGAs. LMH6882 is dual-channel PDA, while LMH6881 is single-channel. Both Diff Amps feature 2.4GHz of bandwidth, 26dB to 6dB Voltage Gain Range, and 0.25dB Voltage Gain Step Size. They also provide optimized performance: 9.7dB Noise Figure, 44-dBm OIP3 (Output Third-Order Intercept Point), -100 dBc HD3 (Third Harmonic Distortion). Those specs are measured at maximum gain (26 dB) and 100-MHz input frequency

LMH6881 and LMH6882  Programmable Differential Amplifiers are powerful and easy to use. The gain control can be implemented via SPI bus or dedicated pins. They support for DC/AC coupling and single-ended-to-differential conversion eliminates the need for a balun. LMH6882′s channel gain matching of 0.2 dB and phase matching of 1.5 degrees provide excellent image rejection for wideband zero IF and I/Q sampling applications. LMH6881 and LMH6882 PDAs are able to drive high-speed analog-to-digital converters (ADCs), support for 8 to 14 bit, single or dual-channel ADCs.

Key Features of LMH6881 Programmable Differential Amplifier:

  • Small Signal Bandwidth: 2400MHz
  • OIP3 @ 100 MHz: 44dBm
  • HD3 @ 100 MHz: ?100dBc
  • Noise Figure: 9.7dB
  • Voltage Gain Range: 26dB to 6dB
  • Voltage Gain Step Size 0.25dB
  • Input Impedance 100 ohm
  • Parallel and Serial Gain Control
  • Power Down Capability

More detail information about LMH6881 Programmable Differential Amplifier can be found at:
http://www.ti.com/lit/ds/symlink/lmh6881.pdf (PDF , 1751 KB)

Key Features of LMH6882 Programmable Differential Amplifier:

  • Small Signal Bandwidth: 2400MHz
  • OIP3 @ 100 MHz: 42dBm
  • HD3 @ 100 MHz: ?100dBc
  • Noise Figure: 9.7dB
  • Voltage Gain: 26dB to 6dB
  • Voltage Gain Step Size 0.25dB
  • Input Impedance 100 ohm
  • Parallel and Serial Gain Control
  • Power Down Capability

More detail information about LMH6882 Programmable Differential Amplifier can be found at:
http://www.ti.com/lit/ds/symlink/lmh6882.pdf (PDF , 2084 KB)

The LMH6881 single-channel Programmable Differential Amplifier is available today in a 24-pin, 2.6-mm by 2.6-mm QFN package for US$3.71 in 1,000-unit quantities. The LMH6882 dual-channel Programmable Differential Amplifier is available today in a 36-pin, 4.6-mm by 4.6-mm QFN package for US$5.95 in 1,000-unit quantities.

Source: PRNewswire, Texas Instruments


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