ADS8920B Datasheet, PDF (1/6 Pages) Texas Instruments – ADS892xB 16-bit, High-Speed SAR ADCs With Integrated Reference Buffer, Integrated LDO, and multiSPI™ Digital Interface

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ADS8920B
ADS8922B
ADS8924B
SBAS729 – JUNE 2016
ADS892xB 16-bit, High-Speed SAR ADCs With Integrated Reference Buffer,
Integrated LDO, and multiSPI™ Digital Interface
1 Features
•1 Resolution: 16-bit
• High Sample Rate With No Latency Output:
– ADS8920B : 1 MSPS
– ADS8922B : 500 kSPS
– ADS8924B : 250 kSPS
• Integrated LDO Enables Single-Supply Operation
• Burst-Mode Operation With Precise First Sample
• Excellent AC and DC Performance:
– SNR: 96.8 dB, THD: –125 dB
– INL: ±0.5 LSB (Max)
– DNL: ±0.5 LSB (Max), 16-Bit NMC
• Wide Input Range:
– Unipolar Differential Input Range: ±V_REF
– V_REF Input Range: 2.5 V to 5 V
• Single-Supply, Low-Power Operation
(Includes Internal Reference Buffer and LDO)
– ADS8920B : 21 mW at 1 MSPS
– ADS8922B : 16 mW at 500 kSPS
– ADS8924B : 14 mW at 250 kSPS
• multiSPI™ Digital Interface
• Extended Temperature Range: –40°C to +125°C
• Small Footprint: 4-mm × 4-mm VQFN
2 Applications
• Test and Measurement
• Medical Imaging
• High-Precision, High-Speed Industrial Data
Acquisition
3 Description
The ADS8920B, ADS8922B, and ADS8924B
(ADS892xB) belong to a family of pin-to-pin
compatible, high-speed, high-precision successsive
approximation register (SAR) based, analog-to-digital
convertors (ADCs) with an integrated reference buffer
and integrated low-dropout regulator (LDO). These
devices support unipolar, fully-differential analog input
signals with ±0.5-LSB INL (max) and 96-dB SNR
(min) specifications over the specified range of
operating conditions.
The integrated LDO enables single-supply operation
with low power consumption. The integrated
reference buffer supports burst-mode data acquisition
with 16-bit precision for the first sample. External
reference voltages in the range 2.5 V to 5 V are
supported, offering a wide selection of input ranges
without additional input scaling.
The integrated multiSPI digital interface is backward-
compatible to the traditional SPI protocol.
Additionally, configurable features simplify board
layout, timing, and firmware, and support high
throughput at lower clock speeds. The multiSPI digital
interface allows for easy interface with a variety of
microcontrollers, digital signal processors (DSPs),
and field-programmable gate arrays (FPGAs).
The ADS892x family is offered in a space-saving,
4-mm × 4-mm, VQFN package, and is fully specified
over the extended temperature range of –40°C to
+125°C.
PART NUMBER
ADS892xB
Device Information
PACKAGE
BODY SIZE (NOM)
VQFN (24)
4.00 mm × 4.00 mm
(1) For all available packages, see the package option addendum
at the end of the datasheet.
Functional Block Diagram
RVDD
DECAP
AINP
AINM
BUF
LDO
SAR
ADC
multiSPI^TM
Digital
Interface
REFIN
REFBUFOUT
REFM
DVDD
To Digital
Host
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.