LT6350
Recommended for New Designs
The LT6350 is a rail-to-rail input and output low noise single-ended to differential converter/ADC driver featuring fast settling time. It converts a high...
Datasheet
LT6350 on Analog.com
LTC6363
Last Time Buy
The LTC6363 family consists of four fully differential, low power, low noise amplifiers with rail-to-rail outputs optimized to drive SAR ADCs. The LTC6363...
Datasheet
LTC6363 on Analog.com
AD1938
Production
The AD1938 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) with input and eight digital-to-analog converters...
Datasheet
AD1938 on Analog.com
Anyone have recommendations for single ended to unity-gain differential signal drivers for microphone signals at low output impedance, noise, and quiescent current (<5mA)? I see some chips like LTC6363-1 and LT6350 but these indicate SAR optimization. My application would interface with a downstream ADC/preamp which I presume falls into sigma-delta category. Would these types of chips by an issue? Looking for compact solution that eliminates delays, cascading noise, etc. Thanks in advance for any input.
Hello Kapila,
You kind of are describing two different applications. An ADC will usually require an input level that is higher than a mic level signal. Although it does depend on what the AVDD voltage the part is operating on. Our newer parts that run on 1.8V require a small signal as a full-scale input.
I captured this circuit from the AD1938 datasheet. It is an older design and you will probably not like the way it inverts.
It is meant to drive an ADC with a 3.3V power rail that is sitting up at around a 1.5V common mode voltage. This is a very common circuit and can be a good starting point.
Even though this is a good audio question, you are probably better to ask this on the linear amplifiers section of the forum. (+) Amplifiers - EngineerZone (analog.com)
I think they should be able to help and also try searching that forum space for answers.
Dave T
