Features: `1.25 MHz Sample Rate, 14-Bit Resolution`Zero Latency`Unipolar, Pseudo Differential Input, Range: − 0 V to 2.5 V`SPI™ Compatible Serial Interface`77.5 dB SNR and −95 dB THD at 0.5 MHz I/P`Power Dissipation 45 mW at 1.25 MSPS`Nap Mode (10 mW Power Dissipation)`Power Down...
ADS7890: Features: `1.25 MHz Sample Rate, 14-Bit Resolution`Zero Latency`Unipolar, Pseudo Differential Input, Range: − 0 V to 2.5 V`SPI™ Compatible Serial Interface`77.5 dB SNR and −95 dB T...
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UNIT | ||
+IN to AGND |
−0.3 V to +VA + 0.1 V | |
IN to AGND |
−0.3 V to 0.5 V | |
+VA to AGND |
0.3 V to 7 V | |
+VBD to BDGND |
0.3 V to 7 V | |
Digital input voltage to GND |
0.3 V to +VBD + 0.3 V | |
Digital output to GND |
0.3 V to +VBD + 0.3 V | |
Operating temperature range |
40°C to 85°C | |
Storage temperature range |
65°C to 150°C | |
Junction temperature (TJ max) |
150°C | |
TQFP package | Power dissipation |
(TJMax - TA)/JA |
JA thermal impedance |
86°C/W | |
Lead temperature, soldering | Vapor phase (60 sec) |
215°C |
Infrared (15 sec) |
220°C |
The ADS7890 is a 14-bit 1.25-MSPS A-to-D converter with 2.5-V internal reference. The device includes a capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit serial SPI or DSP compatible interface. The device has a pseudo-differential input stage.
The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor and also to cancel common-mode noise. The ADS7890 operates at lower power when used at lower conversion rates because of the nap feature. The device is available in a 48-pin TQFP package.