ADS8484_15 Datasheet, PDF (1/33 Pages) Texas Instruments – 18-BIT, 1.25-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE, REFERENCE

BurrĆBrown Products
from Texas Instruments
ADS8484
SLAS511 – NOVEMBER 2007
18-BIT, 1.25-MSPS, PSEUDO-BIPOLAR, FULLY DIFFERENTIAL INPUT, MICROPOWER
SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE,
REFERENCE
FEATURES
1
• 48-Pin 7x7 QFN Package
• 1.25-MHz Sample Rate
• ±1.5 LSB Typ, ±2.5 LSB Max INL
• +0.8/-0.6 LSB Typ, +1.5/-1 LSB Max DNL
• 18-Bit NMC Ensured Over Temperature
• ±0.5-mV Offset Error
• ±0.05-PPM/°C Offset Error Drift
• ±0.1 %FSR Gain Error
APPLICATIONS
• Medical Instruments
• Optical Networking
• Transducer Interface
• High Accuracy Data Acquisition Systems
• Magnetometers
• ±0.5-PPM/°C Gain Error Drift
DESCRIPTION
• 98.5dB SNR, –120db THD, 121dB SFDR
• Zero Latency
• Low Power: 235 mW Typ at 1.25 MSPS
• Pseudo-Bipolar Fully Differential Input Range:
V_ref to –V_ref
• Onboard Reference with 6 PPM/°C Drift
• Onboard Reference Buffer
The ADS8484 is an 18-bit, 1.25-MSPS A/C converter
with an internal 4.096-V reference and a
pseudo-bipolar, fully differential input. The device
includes a 18-bit capacitor-based SAR A/D converter
with inherent sample and hold. The ADS8484 offers a
full 18-bit interface, a 16-bit option where data is read
using two read cycles, or an 8-bit bus option using
three read cycles.
• High-Speed Parallel Interface
• Wide Digital Supply 2.7 V to 5.25 V
• 8-/16-/18-Bit Bus Transfer
The ADS8484 is available in a 48-lead 7x7 QFN
package and is characterized over the industrial
–40°C to 85°C temperature range.
HIGH SPEED SAR CONVERTER FAMILY
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
500 kHz
ADS8383
ADS8327
ADS8328
~600 kHz
ADS8381
ADS8380 (s)
ADS8382 (s)
ADS8370 (s)
ADS8472 (s)
750 kHz
ADS8371
1 MHz
ADS8481
ADS8482
ADS8471
ADS8472
ADS7886
1.25 MHz
2 MHz
3 MHz
4MHz
ADS8484
ADS8401
ADS8405
ADS8402
ADS8406
ADS7890 (s)
ADS8411
ADS8410 (s)
ADS8412
ADS8413 (s)
ADS7891
ADS8422
ADS7881
REFOUT
+IN
−IN
REFIN
+
_
CDAC
4.096-V
Internal
Reference
SAR
Comparator
Clock
Output
Latches
and
3-State
Drivers
Conversion
and
Control Logic
BYTE
16-/8-Bit
Parallel DA TA
Output Bus
BUS 18/16
CONVST
BUSY
CS
RD
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 © 2007, Texas Instruments Incorporated