ADS8900B Datasheet, PDF (1/76 Pages) Texas Instruments – 20-Bit, High-Speed SAR ADCs With Integrated Reference Buffer, Integrated LDO, and multiSPI Digital Interface

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ADS8900B, ADS8902B, ADS8904B
SBAS728 – NOVEMBER 2016
ADS890xB 20-Bit, High-Speed SAR ADCs With Integrated Reference Buffer,
Integrated LDO, and multiSPI™ Digital Interface
1 Features
•1 Resolution: 20 Bits
• High Sample Rate With No Latency Output:
– ADS8900B: 1 MSPS
– ADS8902B: 500 kSPS
– ADS8904B: 250 kSPS
• Integrated LDO Enables Low-Power, Single-
Supply Operation
• Burst-Mode Operation With Precise First Sample
• Excellent AC and DC Performance:
– SNR: 104.5 dB, THD: –125 dB
– DNL: ±0.5 ppm (Max), 20-Bit NMC
– INL: ±1 ppm (Typ)
– ±2 ppm (Max), 0°C to 60°C
– ±2.75 ppm (Max), –40°C to +85°C
– ±3.75 ppm (Max), –40°C to +125°C
• Wide Input Range:
– Unipolar Differential Input Range: ±V_REF
– V_REF Input Range: 2.5 V to 5 V
• 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 Data Acquisition
3 Description
The ADS8900B, ADS8902B, and ADS8904B
(ADS890xB) belong to a family of pin-to-pin
compatible, high-speed, high-precision successive-
approximation-register (SAR) 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 ±1-ppm INL and 104.5-dB SNR
specifications under typical operating conditions.
The integrated LDO enables single-supply operation
with low power consumption. The integrated
reference buffer supports burst-mode data acquisition
with 20-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 ADS890xB family is offered in a space-saving,
4-mm × 4-mm, VQFN package, and is specified over
the extended temperature range of –40°C to +125°C.
PART NUMBER
ADS890xB
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.
AVDD
REF5050
VIN
VOUT
GND
Multiple-ADC Design
ADS89xxB
ADS89xxB
AVDD
BUF
AVDD
BUF
LDO
LDO
OPA2625
ADC
OPA2625
ADC
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. PRODUCTION DATA.