Linear Technology DC846A - LTC2447UHF | 24-Bit High Speed 4-/8-Channel Delta Sigma ADC (req DC590) DC846A DC846A 数据表

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DEMO MANUAL DC846A

LTC2447 

4-/8-Channel High Speed, 

24-Bit Delta Sigma ADC with 

Selectable Reference Inputs

The LTC

®

2447 is a 4-/8-channel, high speed, 24-bit ΔΣ 

ADC with ten selectable speed/resolution modes from 
6.9Hz/200nV

RMS

 to 3.5kHz/25μV

RMS 

(4kHz with external 

oscillator). Key DC specifications include 5ppm INL, 5μV 
offset, 10ppm full-scale error and 20nV/°C offset drift. In 
the 6.9Hz/200nV

RMS 

mode, input normal mode rejection 

of 50Hz and 60Hz noise is better than 87dB. The accuracy 
(offset, full-scale, linearity, drift) and power dissipation 
are independent of the speed selected. The LTC2447 also 
has four reference inputs dedicated to the four differential 
input channels and corresponding pairs of single-ended 
input channels. This allows the inputs to have different 
reference sources, facilitating independent ratiometric 
measurements on each channel.

L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks 
and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the 
property of their respective owners.

The LTC2447 performs autozeroing of the ADC by chopping 
the inputs through the multiplexer outputs. This allows an 
external dual buffer amplifier to isolate the signal inputs 
from the sampling current of the ADC inputs.

DC846 is a member of Linear Technology‘s QuikEval™ 
family of demonstration boards. It is designed to allow easy 
evaluation of the LTC2447 and may be connected directly 
to the target application’s analog signals while using the 
DC590 USB serial controller board and supplied software 
to measure performance. The exposed ground planes allow 
proper grounding to prototype circuitry. After evaluating 
with LTC’s software, the digital signals can be connected 
to the application’s processor/controller for development 
of the serial interface.