Texas Instruments ADS8381 Handleiding
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SLAS364D − APRIL 2002 − REVISED FEBRUARY 2005
FEATURES
D580-kHz Sample Rate
D18-Bit NMC Ensured Over Temperature
DZero Latency
DLow Power: 115 mW at 580 kHz
DUnipolar Input Range
DOnboard Reference Buffer and Conversion
Clock
DWide Buffer Supply, 2.7 V to 5.25 V
DFlexible 8-/16-/18-Bit Parallel Interface
DPin Compatible With ADS8383
D48-Pin TQFP Package
APPLICATIONS
DMedical Instruments
DOptical Networking
DTransducer Interface
DHigh Accuracy Data Acquisition Systems
DMagnetometers
DESCRIPTION
The ADS8381 is an 18-bit, 580 kHz A/D converter. The
device includes a 18-bit capacitor-based SAR A/D
converter with inherent sample and hold. The ADS8381
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.
The ADS8381 is available in a 48-lead TQFP package and
is characterized over the industrial −40°C to 85°C
temperature range.
CDAC
_
+
Output
Latches
and
3-State
Drivers
BUS 18/16
BYTE
18-/16-/8-Bit
Parallel DATA
Output Bus
SAR
Conversion
and
Control Logic
Comparator
Clock
+IN
−IN
REFIN
CONVST
BUSY
CS
RD
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2002−2005, Texas Instruments Incorporated
SLAS364D − APRIL 2002 − REVISED FEBRUARY 2005
www.ti.com
2
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.
ORDERING INFORMATION
MODEL
MAXIMUM
INTEGRAL
LINEARITY
(LSB)
MAXIMUM
DIFFERENTIAL
LINEARITY
(LSB)
NO
MISSING
CODES
RESOLU-
TION (BIT)
PACKAGE
TYPE
PACKAGE
DESIGNATOR
TEMPER-
ATURE
RANGE
ORDERING
INFORMATION
TRANS-
PORT
MEDIA
QUANTITY
ADS8381I
±6
−2/3
17
48 Pin
PFB
−40
°
C to
ADS8381IPFBT
Tape and
reel 250
ADS8381I
±
6
−2/3
17
48 Pin
TQFP
PFB
−40C to
85°C
ADS8381IPFBR
Tape and
reel 1000
ADS8381IB
±5
−1/2
18
48 Pin
PFB
−40
°
C to
ADS8381IBPFBT
Tape and
reel 250
ADS8381IB
±
5
−1/2
18
48 Pin
TQFP
PFB
−40C to
85°C
ADS8381IBPFBR
Tape and
reel 1000
NOTE:
For the 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
over operating free-air temperature range unless otherwise noted
(1)
UNIT
Voltage
+IN to AGND−0.4 V to +VA + 0.1 V
Voltage
−IN to AGND−0.4 V to 0.5 V
+VA to AGND−0.3 V to 7 V
Voltage range
+VBD to BDGND−0.3 V to 7 V
Voltage range
+VA to +VBD−0.3 V to 2.55 V
Digital input voltage to BDGND−0.3 V to +VBD + 0.3 V
Digital output voltage to BDGND−0.3 V to +VBD + 0.3 V
Operating free-air temperature range, T
A
−40°C to 85°C
Storage temperature range, T
stg
−65°C to 150°C
Junction temperature (T
J
max)150°C
TQFP package
Power dissipation(T
J
Max − T
A
)/θ
JA
TQFP package
θ
JA
thermal impedance86°C/W
Lead temperature, soldering
Vapor phase (60 sec)215°C
Lead temperature, soldering
Infrared (15 sec)220°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 “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
SLAS364D − APRIL 2002 − REVISED FEBRUARY 2005
www.ti.com
3
SPECIFICATIONS
T
A
= −40°C to 85°C, +VA = 5 V, +VBD = 3 V or 5 V, V
ref
= 4.096 V, f
SAMPLE
= 580 kHz (unless otherwise noted)
PARAMETER
TEST
ADS8381IBADS8381I
UNIT
PARAMETER
TEST
CONDITIONS
MINTYPMAXMINTYPMAX
UNIT
Analog Input
Full-scale input voltage (see Note 1)+IN − −IN0V
ref
0V
ref
V
Absolute input voltage
+IN−0.2V
ref
+ 0.2−0.2V
ref
+ 0.2
V
Absolute input voltage
−IN−0.20.2−0.20.2
V
Input capacitance4545pF
Input leakage current11nA
System Performance
Resolution1818Bits
No missing codes1817Bits
Integral linearity (see Notes 2 and 3)
< 0.125 FS−4−2.2/14−55
LSB
Integral linearity (see Notes 2 and 3)
> 0.125 FS−5−3/25−66
LSB
(18 bit)
Differential linearity−1−0.6/1.252−23
LSB
(18 bit)
Offset error−0.75±0.250.75−1±0.51mV
Gain error (see Note 4)−0.0750.075−0.10.1%FS
Noise6060µV RMS
Power supply rejection ratio
At 3FFFFh
output code
7575dB
Sampling Dynamics
Conversion time1.41.4µs
Acquisition time0.30.3µs
Throughput rate580580kHz
Aperture delay44ns
Aperture jitter1515ps
Step response150150ns
Over voltage recovery150150ns
(1)
Ideal input span, does not include gain or offset error.
(2)
LSB means least significant bit
(3)
This is endpoint INL, not best fit.
(4)
Measured relative to an ideal full-scale input (+IN − −IN) of 4.096 V
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS8381 |
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