Datasheet LTC2508-32 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 32-Bit Over-Sampling ADC with Configurable Digital Filter |
| Pages / Page | 36 / 1 — FEATURES. DESCRIPTION. ±0.5ppm INL (Typ). 145dB Dynamic Range (Typ) at … |
| File Format / Size | PDF / 1.4 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. ±0.5ppm INL (Typ). 145dB Dynamic Range (Typ) at 61sps. 131dB Dynamic Range (Typ) at 4ksps
Model Line for this Datasheet
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LTC2508-32 32-Bit Oversampling ADC with Configurable Digital Filter
FEATURES DESCRIPTION
n
±0.5ppm INL (Typ)
The LTC®2508-32 is a low noise, low power, high perfor- n
145dB Dynamic Range (Typ) at 61sps
mance 32-bit ADC with an integrated configurable digital n
131dB Dynamic Range (Typ) at 4ksps
filter. Operating from a single 2.5V supply, the LTC2508-32 n
Guaranteed 32-Bits No Missing Codes
features a fully differential input range up to ±VREF, with n
Configurable Digital Filter with Synchronization
VREF ranging from 2.5V to 5.1V. The LTC2508-32 supports n Relaxed Anti-Aliasing Filter Requirements a wide common mode range from 0V to VREF simplifying n
Dual Output 32-Bit SAR ADC
analog signal conditioning requirements. n 32-Bit Digitally Filtered Low Noise Output The LTC2508-32 simultaneously provides two output n 14-Bit Differential + 8-Bit Common Mode 1Msps codes: (1) a 32-bit digitally filtered high precision low No Latency Output noise code, and (2) a 22-bit no latency composite code. n
Wide Input Common Mode Range
The configurable digital filter reduces measurement noise n Guaranteed Operation to 85°C by lowpass filtering and down-sampling the stream of n 1.8V to 5V SPI-Compatible Serial I/O data from the SAR ADC core, giving the 32-bit filtered n Low Power: 24mW at 1Msps output code. The 22-bit composite code consists of a n 24-Lead 7mm × 4mm DFN Package 14-bit code representing the differential voltage and an 8-bit code representing the common mode voltage. The
APPLICATIONS
22-bit composite code is available each conversion cycle, n Seismology with no cycle of latency. n Energy Exploration n The digital filter can be easily configured for 4 different Automated Test Equipment (ATE) n down-sampling factors by pin strapping. The configura- High Accuracy Instrumentation tions provide a dynamic range of 131dB at 3.9ksps and L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Analog Devices, Inc. All other trademarks are the property of their 145dB at 61sps. The digital lowpass filter relaxes the re- respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673, 8576104, quirements for analog anti-aliasing. Multiple LTC2508-32 8810443, 9054727, 9231611, 9331709 and patents pending. devices can be easily synchronized using the SYNC pin.
TYPICAL APPLICATION Integral Nonlinearity vs Input Voltage
2.5V 1.8V TO 5.1V 2.0 10µF 0.1µF 1.5 IN+, IN– SAMPLE ARBITRARY DIFFERENTIAL VDD LTC2508-32 OVDD MCLK 1.0 V CLOCK REF VREF BUSY IN+ DRL 0.5 PIN SELECTABLE 32-BIT LOW-PASS SDOA 0V 0V 32-BIT 0 WIDEBAND BIPOLAR UNIPOLAR SAR ADC SCKA VREF VREF CORE DIGITAL FILTER RDLA –0.5 INL ERROR (ppm) IN– RDLB 14-BIT –1.0 SDOB 0V 0V REF GND SCKB –1.5 DIFFERENTIAL INPUTS IN+/IN– WITH 250832 TA01 WIDE INPUT COMMON MODE RANGE 2.5V TO 5.1V 47µF –2.0 (X7R, 1210 SIZE) –5 –2.5 0 2.5 5 INPUT VOLTAGE (V) 250832 TA01a 250832fc For more information www.linear.com/LTC2508-32 1
FEATURES DESCRIPTION
n
±0.5ppm INL (Typ)
The LTC®2508-32 is a low noise, low power, high perfor- n
145dB Dynamic Range (Typ) at 61sps
mance 32-bit ADC with an integrated configurable digital n
131dB Dynamic Range (Typ) at 4ksps
filter. Operating from a single 2.5V supply, the LTC2508-32 n
Guaranteed 32-Bits No Missing Codes
features a fully differential input range up to ±VREF, with n
Configurable Digital Filter with Synchronization
VREF ranging from 2.5V to 5.1V. The LTC2508-32 supports n Relaxed Anti-Aliasing Filter Requirements a wide common mode range from 0V to VREF simplifying n
Dual Output 32-Bit SAR ADC
analog signal conditioning requirements. n 32-Bit Digitally Filtered Low Noise Output The LTC2508-32 simultaneously provides two output n 14-Bit Differential + 8-Bit Common Mode 1Msps codes: (1) a 32-bit digitally filtered high precision low No Latency Output noise code, and (2) a 22-bit no latency composite code. n
Wide Input Common Mode Range
The configurable digital filter reduces measurement noise n Guaranteed Operation to 85°C by lowpass filtering and down-sampling the stream of n 1.8V to 5V SPI-Compatible Serial I/O data from the SAR ADC core, giving the 32-bit filtered n Low Power: 24mW at 1Msps output code. The 22-bit composite code consists of a n 24-Lead 7mm × 4mm DFN Package 14-bit code representing the differential voltage and an 8-bit code representing the common mode voltage. The
APPLICATIONS
22-bit composite code is available each conversion cycle, n Seismology with no cycle of latency. n Energy Exploration n The digital filter can be easily configured for 4 different Automated Test Equipment (ATE) n down-sampling factors by pin strapping. The configura- High Accuracy Instrumentation tions provide a dynamic range of 131dB at 3.9ksps and L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and SoftSpan is a trademark of Analog Devices, Inc. All other trademarks are the property of their 145dB at 61sps. The digital lowpass filter relaxes the re- respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673, 8576104, quirements for analog anti-aliasing. Multiple LTC2508-32 8810443, 9054727, 9231611, 9331709 and patents pending. devices can be easily synchronized using the SYNC pin.
TYPICAL APPLICATION Integral Nonlinearity vs Input Voltage
2.5V 1.8V TO 5.1V 2.0 10µF 0.1µF 1.5 IN+, IN– SAMPLE ARBITRARY DIFFERENTIAL VDD LTC2508-32 OVDD MCLK 1.0 V CLOCK REF VREF BUSY IN+ DRL 0.5 PIN SELECTABLE 32-BIT LOW-PASS SDOA 0V 0V 32-BIT 0 WIDEBAND BIPOLAR UNIPOLAR SAR ADC SCKA VREF VREF CORE DIGITAL FILTER RDLA –0.5 INL ERROR (ppm) IN– RDLB 14-BIT –1.0 SDOB 0V 0V REF GND SCKB –1.5 DIFFERENTIAL INPUTS IN+/IN– WITH 250832 TA01 WIDE INPUT COMMON MODE RANGE 2.5V TO 5.1V 47µF –2.0 (X7R, 1210 SIZE) –5 –2.5 0 2.5 5 INPUT VOLTAGE (V) 250832 TA01a 250832fc For more information www.linear.com/LTC2508-32 1
