MAX11270 Datasheet, PDF (1/46 Pages) Maxim Integrated Products – Integrated PGA

MAX11270
EVALUATION KIT AVAILABLE
24-Bit, 10mW, 130dB SNR, 64ksps Delta-Sigma
ADC with Integrated PGA
General Description
The MAX11270 is a 24-bit delta-sigma ADC that achieves
excellent 130dB SNR while dissipating an ultra-low 10mW.
Sample rates up to 64ksps allow both precision DC and
AC measurements. Integral nonlinearity is guaranteed
to 4ppm maximum. The THD is -122dB. The MAX11270
communicates via an SPI-compatible serial interface and
is available in a small 24-pin TSSOP package.
The MAX11270 offers a 6.5nV/√Hz noise programmable
gain amplifier with gain settings between 1x to 128x.
Optional buffers are also included to provide isolation of
the signal inputs from the switched capacitor sampling
network. This allows the MAX11270 to be used with
high-impedance sources without compromising available
dynamic range.
The MAX11270 operates from a single 2.7V to 3.6V
analog supply, or split ±1.8V analog supplies, allowing
the analog input to be sampled below ground. The digital
supply range is 2.0V to 3.6V, allowing communication with
2.5V, 3V, or 3.3V logic.
Applications
●● Scientific Instrumentation
●● High-Precision Portable Sensors
●● Medical Equipment
●● ATE
Ordering Information and Functional Diagram appear at
end of data sheet.
Typical Application Circuit
Features and Benefits
●● High Resolution for Instrumentation Applications that
Require a Wide Dynamic Range
∙ 130dB SNR at 1.9sps
∙ 112dB SNR at 1000sps
∙ 20.4-Bit Noise-Free Resolution at 1.9sps
∙ 17.4-Bit Noise-Free Resolution at 1000sps
●● Longer Battery Life for Portable Applications
∙ 2.4mA Operating Mode Current
∙ 4.4mA PGA Low-Noise Mode Current
∙ 1μA Sleep Current
●● High Accuracy for DC Measurements
∙ 1ppm INL (typ), 4ppm (max)
●● Single or Split Analog Supplies Provide Input Voltage
Range Flexibility
∙ 2.7V to 3.6V (Single Supply) or
±1.8V (Split Supplies)
●● Flexible High-Performance Filter Architecture
Simplifies Design
∙ Programmable SINC Filter
●● Enables System Integration
∙ Low-Noise PGA with Gains of 1, 2, 4, 8, 16, 32,
64, 128
∙ Signal Buffer Optional
∙ 3 General-Purpose I/Os
●● Enables Integrated Part and System Calibration
Calibration for Gain and Offset
●● Robust 24-Pin TSSOP Packaging
AINP
10nF
C0G
AINN
2.7V TO 3.6V
REF
10nF
1µF
2.0V TO 3.6V
1µF
REFN REFP
AVDD
DVDD
MAX11270
RST
SYNC
CSB
SCLK
µC
DIN
DOUT
RDY
GPIO3 GPI02 GPI01
CAPP CAPN CAPREG AVSS AVSS DGND
1µF
0603
10nF ^X7R
C0G
19-7048; Rev 0; 8/14