ADS8254 Datasheet, PDF (1/36 Pages) Texas Instruments – 16-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER

ADS8254
www.ti.com................................................................................................................................................................................................... SLAS643 – MARCH 2009
16-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC
DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER
FEATURES
1
• 1.0-MHz Sample Rate, Zero Latency at Full
Speed
• 16-Bit Resolution
• Supports Pseudo-Bipolar Differential Input
Range: -4 V to +4 V with 2-V Common-Mode
• Built-In Four Channel, Differential Ended
Multiplexer; with Channel Count Selection and
Auto/Manual Mode
• On-Board Differential ADC Driver (OPA)
• Buffered Reference Output to Level Shift
Bipolar ±4-V Input with External Resistance
Divider
• Reference/2 Output to Set Common-Mode for
External Signal Conditioner
• 16-/8-Bit Parallel Interface
• SNR: 95.4dB Typ at 2-kHz I/P
• THD: –118dB Typ at 2-kHz I/P
• Power Dissipation: 331.25 mW at 1 MSPS
• Internal Reference
• Internal Reference Buffer
• 64-Pin QFN Package
APPLICATIONS
• Medical Imaging/CT Scanners
• Automated Test Equipment
• High-Speed Data Acquisition Systems
• High-Speed Closed-Loop Systems
DESCRIPTION
The ADS8254 is a high-performance analog
system-on-chip (SoC) device with an 16-bit, 1-MSPS
A/D converter, 4-V internal reference, an on-chip
ADC driver (OPA), and a 4-channel differential
multiplexer. The channel count of the multiplexer and
auto/manual scan modes of the device are user
selectable.
The ADC driver is designed to leverage the very high
noise performance of the differential ADC at optimum
power usage levels.
The ADS8254 outputs a buffered reference signal for
level shifting of a ±4-V bipolar signal with an external
resistance divider. A V_ref/2 output signal is available
to set the common-mode of a signal conditioning
circuit. The device also includes an 16-/8-bit parallel
interface.
The ADS8254 is available in a 9 mm x 9 mm, 64-pin
QFN package and is characterized from -40°C to
85°C.
TYPE/SPEED
18-Bit Pseudo-Diff
18-Bit Pseudo-Bipolar, Fully Diff
16-Bit Pseudo-Diff
16-Bit Pseudo-Bipolar, Fully Diff
14-Bit Pseudo-Diff
12-Bit Pseudo-Diff
HIGH-SPEED SAR CONVERTER FAMILY
500 kHz
ADS8383
ADS8327
ADS8328
ADS8319
ADS8318
~600 kHz
ADS8381
ADS8380 (s)
ADS8382 (s)
ADS8370 (s)
ADS8372 (s)
750 kHz
ADS8371
1 MHz
ADS8481
ADS8284
ADS8482
ADS8471
ADS8472
ADS8254
ADS7886
1.25 MHz
ADS8484
ADS8401
ADS8405
ADS8402
ADS8406
ADS7890 (s)
2 MHz
3 MHz
ADS8411
ADS8410 (s)
ADS8412
ADS8413 (s)
ADS7883
ADS7891
4MHz
ADS8422
ADS7881
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated