4.8 kHz Ultralow Noise 24-Bit
Sigma-Delta ADC with PGA
AD7190
Chromatography
FEATURES
PLC/DCS analog input modules
Data acquisition
Medical and scientific instrumentation
RMS noise: 8.5 nV @ 4.7 Hz (gain = 128)
16 noise free bits @ 2.4 kHz (gain = 128)
Up to 22.5 noise free bits (gain = 1)
Offset drift: 5 nV/°C
GENERAL DESCRIPTION
Gain drift: 1 ppm/°C
The AD7190 is a low noise, complete analog front end for high
precision measurement applications. It contains a low noise,
24-bit sigma-delta (∑-Δ) analog to digital converter (ADC).
The on-chip low noise gain stage means that signals of small
amplitude can be interfaced directly to the ADC.
Specified drift over time
2 differential/4 pseudo differential input channels
Automatic channel sequencer
Programmable gain (1 to 128)
Output data rate: 4.7 Hz to 4.8 kHz
Internal or external clock
Simultaneous 50 Hz/60 Hz rejection
4 general-purpose digital outputs
Power supply
AVDD: 4.75 V to 5.25 V
DVDD: 2.7 V to 5.25 V
Current: 6 mA
Temperature range: –40°C to +105°C
Interface
The device can be configured to have two differential inputs or
four pseudo differential inputs. The on-chip channel sequencer
allows several channels to be enabled, and the AD7190
sequentially converts on each enabled channel. This simplifies
communication with the part. The on-chip 4.92 MHz clock can
be used as the clock source to the ADC or, alternatively, an
external clock or crystal can be used. The output data rate from
the part can be varied from 4.7 Hz to 4.8 kHz.
The device has two digital filter options. The choice of filter
affects the rms noise/noise-free resolution at the programmed
output data rate, the settling time, and the 50 Hz/60 Hz
rejection. For applications that require all conversions to be
settled, the AD7190 includes a zero latency feature.
3-wire serial
SPI, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
The part operates with 5 V analog power supply and a digital
power supply from 2.7 V to 5.25 V. It consumes a current of
6 mA. It is housed in a 24-lead TSSOP package.
Weigh scales
Strain gauge transducers
Pressure measurement
Temperature measurement
FUNCTIONAL BLOCK DIAGRAM
AGND AV
DV
DGND REFIN1(+) REFIN1(–)
DD
DD
REFERENCE
DETECT
AD7190
AIN1
AIN2
AIN3
DOUT/RDY
SERIAL
INTERFACE
AND
CONTROL
LOGIC
AIN4
MUX
DIN
Σ-Δ
ADC
AINCOM
PGA
SCLK
CS
SYNC
TEMP
SENSOR
P3
P2
BPDSW
CLOCK
CIRCUITRY
AGND
MCLK1 MCLK2 P0/REFIN2(–) P1/REFIN2(+)
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2008 Analog Devices, Inc. All rights reserved.
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