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SLAS628 – MARCH 2009
18-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC
DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER
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FEATURES
1.0-MHz Sample Rate, Zero Latency at Full
Speed
18-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
18-/16-/8-Bit Parallel Interface
SNR: 98.4dB Typ at 2-kHz I/P
THD: –119dB Typ at 2-kHz I/P
Power Dissipation: 331.25 mW at 1 MSPS
Including ADC Driver
Internal Reference
Internal Reference Buffer
64-Pin QFN Package
APPLICATIONS
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Medical Imaging/CT Scanners
Automated Test Equipment
High-Speed Data Acquisition Systems
High-Speed Closed-Loop Systems
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DESCRIPTION
The ADS8284 is a high-performance analog
system-on-chip (SoC) device with an 18-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 ADS8284 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 18-/16-/8-bit
parallel interface.
The ADS8284 is available in a 9 mm x 9 mm, 64-pin
QFN package and is characterized from -40°C to
85°C.
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HIGH-SPEED SAR CONVERTER FAMILY
TYPE/SPEED
18-Bit Pseudo-Diff
ADS8380 (s)
ADS8382 (s)
18-Bit Pseudo-Bipolar, Fully Diff
ADS8482
ADS8327
16-Bit Pseudo-Diff
ADS8328
ADS8319
ADS8318
16-Bit Pseudo-Bipolar, Fully Diff
ADS8254
14-Bit Pseudo-Diff
12-Bit Pseudo-Diff
ADS7886
ADS8406
ADS7890 (s)
ADS7883
ADS8413 (s)
ADS7891
ADS7881
ADS8372 (s)
ADS8472
ADS8402
ADS8412
ADS8422
ADS8370 (s)
ADS8371
ADS8471
ADS8401
ADS8405
ADS8411
ADS8410 (s)
ADS8284
ADS8484
500 kHz
ADS8383
~600 kHz
ADS8381
750 kHz
1 MHz
ADS8481
1.25 MHz
2 MHz
3 MHz
4MHz
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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
TI [ TEXAS INSTRUMENTS ]
