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ADS7885 Datasheet Preview

ADS7885 Datasheet

SAR ANALOG-TO-DIGITAL CONVERTER

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BurrĆBrown Products
from Texas Instruments
10-/8-BIT, 3-MSPS, MICRO-POWER, MINIATURE
SAR ANALOG-TO-DIGITAL CONVERTERS
ADS7884
ADS7885
SLAS567 – MARCH 2008
FEATURES
1
3-MHz Sample Rate Serial Device
10-Bit Resolution – ADS7884
8-Bit Resolution – ADS7885
Zero Latency
48-MHz Serial Interface
Supply Range: 2.7 V to 5.5 V
Low Power Dissipation:
– 6.8 mW at 3-V VDD, 2.5 MSPS
– 15 mw at 5-V VDD, 3 MSPS
±0.3 LSB INL, ±0.3 LSB DNL – ADS7884
±0.15 LSB INL, ±0.1 LSB DNL – ADS7885
61.7 dB SINAD, –81 dB THD – ADS7884
49.8 dB SINAD, –68 dB THD – ADS7885
Unipolar Input Range: 0 V to VDD
Powerdown Current: 1 µA
Wide Input Bandwidth: 30 MHz at 3 dB
6-Pin SOT23 Package
APPLICATIONS
Base Band Converters in Radio
Communication
Motor Current/Bus Voltage Sensors in Digital
Drives
Optical Networking (DWDM, MEMS Based
Switching)
Optical Sensors
Battery Powered Systems
Medical Instrumentations
High-Speed Data Acquisition Systems
High-Speed Closed-Loop Systems
DESCRIPTION
The ADS7884 is a 10-bit, 3-MSPS analog-to-digital converter (ADC), and the ADS7885 is a 8-bit, 3-MSPS ADC.
The devices include a capacitor based SAR A/D converter with inherent sample and hold. The serial interface in
each device is controlled by the CS and SCLK signals for glueless connections with microprocessors and DSPs.
The input signal is sampled with the falling edge of CS, and SCLK is used for conversion and serial data output.
The devices operate from a wide supply range from 2.7 V to 5.5 V. The low power consumption of the devices
make them suitable for battery-powered applications. The devices also include a power saving powerdown
feature for when the devices are operated at lower conversion speeds.
The high level of the digital input to the device is not limited to device VDD. This means the digital input can go as
high as 5.5 V when device supply is 2.7 V. This feature is useful when digital signals are coming from other
circuit with different supply levels. Also this relaxes restriction on power up sequencing.
The ADS7884 and ADS7885 are available in a 6-pin SOT23 package and are specified for operation from –40°C
to 125°C.
BIT
12-Bit
10-Bit
8-Bit
Micro-Power Miniature SAR Converter Family
< 300 KSPS
ADS7866 (1.2 VDD to 3.6 VDD)
ADS7867 (1.2 VDD to 3.6 VDD)
ADS7868 (1.2 VDD to 3.6 VDD)
300 KSPS – 1.25 MSPS
ADS7886 (2.35 VDD to 5.25 VDD)
ADS7887 (2.35 VDD to 5.25 VDD)
ADS7888 (2.35 VDD to 5.25 VDD)
3 MSPS
ADS7884 (2.7 VDD to 5.5 VDD)
ADS7885 (2.7 VDD to 5.5 VDD)
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 © 2008, Texas Instruments Incorporated




Burr-Brown

ADS7885 Datasheet Preview

ADS7885 Datasheet

SAR ANALOG-TO-DIGITAL CONVERTER

No Preview Available !

ADS7884
ADS7885
SLAS567 – MARCH 2008
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
SAR
+IN
VDD
CDAC
COMPARATOR
ADS7884/ADS7885
OUTPUT
LATCHES
&
3−STATE
DRIVERS
SDO
CONVERSION
&
CONTROL
LOGIC
SCLK
CS
PACKAGE/ORDERING INFORMATION(1)
DEVICE
MAXIMUM
INTEGRAL
LINEARITY
(LSB)
MAXIMUM
DIFFERENTIAL
LINEARITY
(LSB)
ADS7884
±0.8
±0.8
ADS7885
±0.4
±0.4
NO MISSING
CODES AT
RESOLUTION
(BIT)
PACKAGE
TYPE
PACKAGE
DESIGNAT
OR
TEMPERATURE
RANGE
10
6-Pin
SOT23
DBV
–40°C to 125°C
8
6-Pin
SOT23
DBV
–40°C to 125°C
PACKAGE
MARKING
7884
7884
7885
7885
ORDERING
INFORMATION
ADS7884SDBVT
ADS7884SDBVR
ADS7885SDBVT
ADS7885SDBVR
TRANSPORT
MEDIA
QUANTITY
Tape and
reel 250
Tape and
reel 3000
Tape and
reel 250
Tape and
reel 3000
(1) For most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
+IN to AGND
+VDD to AGND
Digital input voltage to GND
Digital output to GND
Operating temperature range
Storage temperature range
Junction temperature (TJ Max)
Power dissipation, SOT23 package
Thermal impedance, θJA
Lead temperature, soldering
SOT23
Vapor phase (60 sec)
Infrared (15 sec)
UNIT
–0.3 V to +VDD +0.3 V
–0.3 V to 7.0 V
–0.3V to (7.0 V)
–0.3 V to (+VDD + 0.3 V)
–40°C to 125°C
–65°C to 150°C
150°C
(TJ Max–TA)/θJA
295.2°C/W
215°C
220°C
(1) Stresses above those listed under absolute maximum ratings may cause permanent damage to the device. Exposure to absolute
maximum conditions for extended periods may affect device reliability.
2
Submit Documentation Feedback
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): ADS7884 ADS7885



Part Number ADS7885
Description SAR ANALOG-TO-DIGITAL CONVERTER
Maker Burr-Brown
Total Page 3 Pages
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ADS7885 Datasheet PDF





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