LMH6646 - 2.7V, 650µA, 55MHz Rail-to-Rail Input and Output Amplifiers with Shutdown Option

Updated : 2020-01-09 14:18:10
Description

The LMH6645 (single) and LMH6646 (dual), rail-to-rail input and output voltage feedback amplifiers, offer high speed (55 MHz), and low voltage operation (2.7 V) in addition to micro-power shutdown capability (LMH6647, single).

Input common mode voltage range exceeds either supply by 0.3 V, enhancing ease of use in multitude of applications where previously only inferior devices could be used. Output voltage range extends to within 20 mV of either supply rails, allowing wide dynamic range especially in low voltage applications. Even with low supply current of 650 µA/amplifier, output current capability is kept at a respectable ±20 mA for driving heavier loads. Important device parameters such as BW, Slew Rate and output current are kept relatively independent of the operating supply voltage by a combination of process enhancements and design architecture.

In portable applications, the LMH6647 provides shutdown capability while keeping the turn-off current to less than 50 µA. Both turn-on and turn-off characteristics are well behaved with minimal output fluctuations during transitions. This allows the part to be used in power saving mode, as well as multiplexing applications. Miniature packages (SOT-23, VSSOP-8, and SOIC-8) are further means to ease the adoption of these low power high speed devices in applications where board area is at a premium.

Products containing the "LMH6646" keyword are: LMH6646 MDC , LMH6646 MDC , LMH6646AMM/NOPB , LMH6646AMMX , LMH6646AMMX/NOPB , LMH6646MA , LMH6646MA/NOPB , LMH6646MA/NOPB , LMH6646MANOPB , LMH6646MAX , LMH6646MAX , LMH6646MAX/NOPB , LMH6646MAX/NOPB , LMH6646MAXNOPB , LMH6646MDC , LMH6646MM , LMH6646MM , LMH6646MM(A70A) , LMH6646MM+ , LMH6646MM/NOPB
Features

  • (VS = 2.7V, TA = 25°C, RL = 1kΩ to V+/2, AV = +1.
    Typical Values Unless Specified.
  • −3dB BW 55 MHz
  • Supply Voltage Range 2.5 V to 12 V
  • Slew Rate 22 V/µs
  • Supply Current 650 µA/channel
  • Output Short Circuit Current 42 mA
  • Linear Output Current ±20 mA
  • Input Common Mode Voltage 0.3 V Beyond Rails
  • Output Voltage Swing 20 mV from Rails 
  • Input Voltage Noise 17 nV/√Hz
  • Input Current Noise 0.75 pA/√Hz

Parametrics
StatusACTIVE
ArchitectureBipolar^Voltage FB
Number of channels2
Total Supply Voltage12
BW @ Acl55
Acl, min spec gain1
Slew Rate22
Vn at flatband17
Vn at 1 kHz17
Iq per channel0.725
Vos (offset voltage @ 25 C)3
Rail-to-railIn^Out
FeaturesN/A
RatingCatalog
Operating temperature range-40 to 85
Package GroupSOIC|8
Approx. price0.99 | 1ku
Package size: mm2:W x L (PKG)[pf]8SOIC[/pf]: 29 mm2: 6 x 4.9 (SOIC|8)
CMRR84
Input bias current2000000
Offset drift5
GBW55
Output current20
2nd harmonic62
3rd harmonic72
@ MHz1
Radiation, TID
Radiation, SEL