ADS7279
ADS7280
www.ti.com ............................................................................................................................................................... SBAS436A – MAY 2008 – REVISED JUNE 2009
LOW-POWER, 14-BIT, 1MHz, SINGLE/DUAL UNIPOLAR INPUT,
ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL INTERFACE
FEATURES
1
•23 2.7V to 5.5V Analog Supply, Low Power:
– 13.7mW (1MHz, +VA = 3V, +VBD = 1.8V)
• 1MHz Sampling Rate 3V ≤ +VA ≤ 5.5V,
900kHz Sampling Rate 2.7V ≤ +VA ≤ 3V
• Excellent DC Performance:
– ±0.4LSB Typ, ±1.0LSB Max INL
– ±0.4LSB Typ, ±1.0LSB Max DNL
– ±0.8mV Max Offset Error at 3V
– ±1.25mV Max Offset Error at 5V
• Excellent AC Performance at fI = 10kHz with
85.9dB SNR, 105.3dB SFDR, –100.1dB THD
• Built-In Conversion Clock (CCLK)
• 1.65V to 5.5V I/O Supply:
– SPI™/DSP-Compatible Serial Interface
– SCLK up to 50MHz
• Comprehensive Power-Down Modes:
– Deep Power-Down
– Nap Power-Down
– Auto Nap Power-Down
• Unipolar Input Range: 0V to VREF
• Software Reset
• Global CONVST (Independent of CS)
• Programmable Status/Polarity EOC/INT
• 4 × 4 QFN-16 and TSSOP-16 Packages
• Multi-Chip Daisy-Chain Mode
• Programmable TAG Bit Output
• Auto/Manual Channel Select Mode (ADS7280)
APPLICATIONS
• Communications
• Transducer Interface
• Medical Instruments
• Magnetometers
• Industrial Process Control
• Data Acquisition Systems
• Automatic Test Equipment
DESCRIPTION
The ADS7279 is a low-power, 14-bit, 1MSPS
analog-to-digital converter (ADC) with a unipolar
input. The device includes a 14-bit, capacitor-based
successive approximation register (SAR) ADC with
inherent sample-and-hold.
The ADS7280 is based on the same core and
includes a 2-to-1 input MUX with a programmable
TAG bit output option. Both the ADS7279 and
ADS7280 offer a high-speed, wide voltage serial
interface, and are capable of daisy-chain mode
operation when multiple converters are used.
These converters are available in 4 × 4 QFN and
TSSOP-16 packages, and are fully specified for
operation over the industrial –40°C to +85°C
temperature range.
Low Power, High-Speed SAR Converter Family
Type/Speed
16-bit single-ended
14-bit single-ended
12-bit single-ended
Single
Dual
Single
Dual
Single
Dual
500 kSPS
ADS8327
ADS8328
1 MSPS
ADS8329
ADS8330
ADS7279
ADS7280
ADS7229
ADS7230
ADS7280 ADS7279
+IN1
NC
+IN0
COM
+IN
-IN
REF+
REF
SAR
OUTPUT
LATCH
SDO
and
3-STATE
+
_
CDAC
COMPARATOR
DRIVER
CONVERSION
and
CONTROL
FS/CS
SCLK
SDI
OSC
LOGI C
CONVST
EOC/INT/CDI
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.
SPI is a trademark of Motorola, Inc.
2
All other trademarks are the property of their respective owners.
3
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 © 2008–2009, Texas Instruments Incorporated
