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ADS7888 Datasheet Preview

ADS7888 Datasheet

Miniature SAR Analog-to-Digital Converter

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ADS7887, ADS7888
SLAS468A – JUNE 2005 – REVISED AUGUST 2016
ADS788x 10-Bit, 8-Bit, 1.25-MSPS, Micro-Power,
Miniature SAR Analog-to-Digital Converters
1 Features
1 1.25-MHz Sample Rate Serial Device
• 10-Bit Resolution (ADS7887)
• 8-Bit Resolution (ADS7888)
• Zero Latency
• 25-MHz Serial Interface
• Supply Range: 2.35 V to 5.25 V
• Typical Power Dissipation at 1.25 MSPS:
– 3.8 mW at 3-V VDD
– 8 mw at 5-V VDD
• ±0.35 LSB INL, DNL (ADS7887)
• ±0.15 LSB INL, ±0.1 LSB DNL (ADS7888)
• 61 dB SINAD, –84 dB THD (ADS7887)
• 49.5 dB SINAD, –67.5 dB THD (ADS7888)
• Unipolar Input Range: 0 V to VDD
• Power-Down Current: 1 µA
• Wide Input Bandwidth: 15 MHz at 3 dB
• 6-Pin SOT23 and SC70 Packages
2 Applications
• Base Band Converters in Radio Communication
• Motor Current and 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
3 Description
The ADS7887 device is a 10-bit, 1.25-MSPS, analog-
to-digital converter (ADC), and the ADS7888 device
is a 8-bit, 1.25-MSPS ADC. These 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
2.35 V to 5.25 V. The low power consumption of the
devices make them suitable for battery-powered
applications. The devices also include a power-
saving, power-down 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 5.25 V when device supply is 2.35 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 ADS7887 and ADS7888 are available in 6-pin
SOT-23 and SC70 packages and are specified for
operation from –40°C to 125°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS7887
ADS7888
SOT-23 (6)
SC70 (6)
2.90 mm × 1.60 mm
2.00 mm × 1.25 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Functional Block Diagram
SAR
+IN
VDD
CDAC
COMPARATOR
ADS7887/ADS7888
OUTPUT
LATCHES
AND
3−STATE
DRIVERS
SDO
CONVERSION
AND
CONTROL
LOGIC
SCLK
CS
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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ADS7888 Datasheet Preview

ADS7888 Datasheet

Miniature SAR Analog-to-Digital Converter

No Preview Available !

ADS7887, ADS7888
SLAS468A – JUNE 2005 – REVISED AUGUST 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Companion Products............................................. 3
6 Device Comparison ............................................... 4
7 Pin Configuration and Functions ......................... 5
8 Specifications......................................................... 6
8.1 Absolute Maximum Ratings ...................................... 6
8.2 ESD Ratings.............................................................. 6
8.3 Recommended Operating Conditions....................... 6
8.4 Thermal Information .................................................. 6
8.5 Electrical Characteristics – ADS7887 ....................... 7
8.6 Electrical Characteristics – ADS7888 ....................... 8
8.7 Timing Requirements ................................................ 9
8.8 Typical Characteristics ............................................ 10
9 Detailed Description ............................................ 16
9.1 Overview ................................................................ 16
9.2 Functional Block Diagram ....................................... 16
9.3 Feature Description................................................. 17
9.4 Device Functional Modes........................................ 18
10 Application and Implementation........................ 20
10.1 Application Information.......................................... 20
10.2 Typical Application ................................................ 20
11 Power Supply Recommendations ..................... 22
12 Layout................................................................... 23
12.1 Layout Guidelines ................................................. 23
12.2 Layout Example .................................................... 23
13 Device and Documentation Support ................. 24
13.1 Documentation Support ........................................ 24
13.2 Related Links ........................................................ 24
13.3 Receiving Notification of Documentation Updates 24
13.4 Community Resources.......................................... 24
13.5 Trademarks ........................................................... 24
13.6 Electrostatic Discharge Caution ............................ 24
13.7 Glossary ................................................................ 24
14 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (June 2005) to Revision A
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
• Changed Thermal Information table ....................................................................................................................................... 6
2
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Copyright © 2005–2016, Texas Instruments Incorporated
Product Folder Links: ADS7887 ADS7888



Part Number ADS7888
Description Miniature SAR Analog-to-Digital Converter
Maker etcTI
Total Page 3 Pages
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