ADS8885 Converter Datasheet

ADS8885 Datasheet, PDF, Equivalent


Part Number

ADS8885

Description

SAR Analog-to-Digital Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download ADS8885 Datasheet


ADS8885
ADS8885
www.ti.com
SBAS568A – MAY 2013 – REVISED DECEMBER 2013
18-Bit, 400-kSPS, Serial Interface, microPower, Miniature,
True-Differential Input, SAR Analog-to-Digital Converter
Check for Samples: ADS8885
FEATURES
1
234 Sample Rate: 400 kHz
• No Latency Output
• Unipolar, True-Differential Input Range:
–VREF to +VREF
• Wide Common-Mode Voltage Range:
0 V to VREF with 90-dB CMRR (min)
• SPI™-Compatible Serial Interface with
Daisy-Chain Option
• Excellent AC and DC Performance:
– SNR: 100 dB, THD: –115 dB
– INL: ±1.5 LSB (typ), ±3.0 LSB (max)
– DNL: +1.5 and –1 LSB (max), 18-Bit NMC
• Wide Operating Range:
– AVDD: 2.7 V to 3.6 V
– DVDD: 1.65 V to 3.6 V
(Independent of AVDD)
– REF: 2.5 V to 5 V (Independent of AVDD)
– Operating Temperature: –40°C to +85°C
• Low-Power Dissipation:
– 2.6 mW at 400 kSPS
– 0.65 mW at 100 kSPS
– 65 µW at 10 kSPS
• Power-Down Current (AVDD): 50 nA
• Full-Scale Step Settling to 18 Bits: 1200 ns
• Packages: MSOP-10 and SON-10
APPLICATIONS
• Automatic Test Equipment (ATE)
• Instrumentation and Process Controls
• Precision Medical Equipment
• Low-Power, Battery-Operated Instruments
DESCRIPTION
The ADS8885 is an 18-bit, 400-kSPS, true-differential
input, analog-to-digital converter (ADC). The device
operates with a 2.5-V to 5-V external reference,
offering a wide selection of signal ranges without
additional input signal scaling. The reference voltage
setting is independent of, and can exceed, the analog
supply voltage (AVDD).
The device offers an SPI-compatible serial interface
that also supports daisy-chain operation for
cascading multiple devices. An optional busy-
indicator bit makes synchronizing with the digital host
easy.
The device supports unipolar, true-differential analog
input signals with a differential input swing of –VREF to
+VREF. This true-differential analog input structure
allows for a common-mode voltage of any value in
the range of 0 V to +VREF (when both inputs are
within the operating input range of –0.1 V to VREF
+ 0.1 V).
Device operation is optimized for very low-power
operation. Power consumption directly scales with
speed. This feature makes the ADS8885 excellent for
lower-speed applications.
Traditional Input Range
ADS8885 Input Range
0V
VDIFF
+VREF
-VREF
True-Differential Input Range
VREF
VCM
VREF
VCM
0V
VREF/2
0 V - VREF
0 V - VREF
2.5 V to 5 V 2.7 V to 3.6 V
AINP
AINM
REF
AVDD
DVDD
DIN
ADS8885
SCLK
DOUT
CONVST
GND
1.65 V to 3.6 V
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.
TINA is a trademark of Texas Instruments Inc..
2
SPI is a trademark of Motorola Inc.
3
All other trademarks are the property of their respective owners.
4
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 © 2013, Texas Instruments Incorporated

ADS8885
ADS8885
SBAS568A – MAY 2013 – REVISED DECEMBER 2013
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
THROUGHPUT
100 kSPS
250 kSPS
400 kSPS
500 kSPS
680 kSPS
1 MSPS
FAMILY INFORMATION(1)
18-BIT, TRUE-DIFFERENTIAL
16-BIT, SINGLE-ENDED
ADS8887
ADS8866
——
ADS8885
ADS8864
ADS8319 (2)
ADS8883
ADS8862
ADS8881
ADS8860
16-BIT, TRUE-DIFFERENTIAL
ADS8867
ADS8865
ADS8318 (2)
ADS8863
ADS8861
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or visit the
device product folder at www.ti.com.
(2) Pin-to-pin compatible device with AVDD = 5 V.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range, unless otherwise noted.
VALUE
MIN
MAX
UNIT
AINP to GND or AINN to GND
–0.3
REF + 0.3
V
AVDD to GND or DVDD to GND
–0.3 4 V
REF to GND
–0.3 5.7 V
Digital input voltage to GND
–0.3 DVDD + 0.3 V
Digital output to GND
–0.3 DVDD + 0.3 V
Operating temperature range, TA
Storage temperature range, Tstg
–40 +85 °C
–65
+150
°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under electrical characteristics is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
THERMAL INFORMATION
THERMAL METRIC(1)
ADS8885
DGS
DRC
UNITS
10 PINS
10 PINS
θJA
θJCtop
θJB
ψJT
ψJB
θJCbot
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
151.9
45.4
72.2
3.3
70.9
N/A
111.1
46.4
45.9
3.5
45.5
N/A
°C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
2 Submit Documentation Feedback
Product Folder Links: ADS8885
Copyright © 2013, Texas Instruments Incorporated


Features ADS8885 www.ti.com SBAS568A – MAY 20 13 – REVISED DECEMBER 2013 18-Bit, 40 0-kSPS, Serial Interface, microPower, M iniature, True-Differential Input, SAR Analog-to-Digital Converter Check for S amples: ADS8885 FEATURES 1 •234 Samp le Rate: 400 kHz • No Latency Output • Unipolar, True-Differential Input R ange: –VREF to +VREF • Wide Common- Mode Voltage Range: 0 V to VREF with 90 -dB CMRR (min) • SPI™-Compatible Se rial Interface with Daisy-Chain Option • Excellent AC and DC Performance: SNR: 100 dB, THD: –115 dB – INL: ±1.5 LSB (typ), ±3.0 LSB (max) – DN L: +1.5 and –1 LSB (max), 18-Bit NMC • Wide Operating Range: – AVDD: 2.7 V to 3.6 V – DVDD: 1.65 V to 3.6 V ( Independent of AVDD) – REF: 2.5 V to 5 V (Independent of AVDD) – Operating Temperature: –40°C to +85°C • Lo w-Power Dissipation: – 2.6 mW at 400 kSPS – 0.65 mW at 100 kSPS – 65 µW at 10 kSPS • Power-Down Current (AVD D): 50 nA • Full-Scale Step Settling to 18 Bits: 1200 ns • Packages: MSOP-10 and SON-10 APPLICATIONS • Automatic Test E.
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