ADS7863 Datasheet PDF - Burr-Brown

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ADS7863
Burr-Brown

Part Number ADS7863
Description Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER
Page 30 Pages


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BurrĆBrown Products
from Texas Instruments
ADS7863
ADS7863
ADS7863
SBAS383 – JUNE 2007
Dual, 1.5MSPS, 12-Bit, 2 + 2 Channel, Simultaneous Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
Four Fully- or Six Pseudo-Differential Inputs
SINAD: 70dB (min), THD: –75dB (max)
Programmable and Buffered Internal 2.5V
Reference
Flexible Power-Down Features
Variable Power Supply Ranges
Low Power Operation: 40mW at 5V
Operating Temperature Range: –40°C to
+125°C
Pin-Compatible with ADS7861 and ADS8361
(SSOP package)
APPLICATIONS
Motor Control
Multi-Axis Positioning Systems
Three-Phase Power Control
DESCRIPTION
The ADS7863 is a dual, 12-bit, 1.5MSPS,
analog-to-digital converter (ADC) with four fully
differential input channels grouped into two pairs for
high-speed, simultaneous signal acquisition. Inputs
to the sample-and-hold (S/H) amplifiers are fully
differential and are maintained differential to the input
of the ADC. This architecture provides excellent
common-mode rejection of 80dB at 50kHz, which is
a critical performance characteristic in noisy
environments.
The ADS7863 is pin-compatible with the ADS8361,
but offers additional features such as a
programmable reference output, flexible supply
voltage (2.7V to 5.5V for AVDD and 1.65V to 5.5V for
BVDD), a pseudo-differential input multiplexer with
three channels per ADC, and several power-down
features.
The high-speed, dual serial interface is also
pin-compatible with the ADS7861 while offering
additional flexibility. The ADS7863 is offered in an
SSOP-24 and a 4x4mm QFN-24 package. It is
specified over the extended operating temperature
range of –40°C to +125°C.
AVDD
CHA0+
CHA0-
CHA1+
CHA1-
CHB0+
CHB0-
CHB1+
CHB1-
REFIN
Input
MUX
Input
MUX
SAR
S/H CDAC
Comparator
S/H CDAC
Comparator
SAR
BVDD
SDOA
SDOB
M0
M1
SDI
CLOCK
CS
RD
BUSY
CONVST
BGND
REFOUT
AGND
10-Bit DAC
2.5V Reference
Functional Block Diagram
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.
All trademarks are the property of their respective owners.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2007, Texas Instruments Incorporated



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ADS7863
SBAS383 – JUNE 2007
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.
ORDERING INFORMATION(1)
PRODUCT
ADS7863I
PACKAGE-LEAD
SSOP-24
4x4 QFN-24
PACKAGE
DESIGNATOR
DBQ
RGE
ORDERING NUMBER
ADS7863IDBQ
ADS7863IDBQR
ADS7863IRGE
ADS7863IRGER
TRANSPORT MEDIA,
QUANTITY
Tube, 56
Tape and Reel, 2500
Tape and Reel, 250
Tape and Reel, 3000
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document or see the TI
web site at www.ti.com
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range, unless otherwise noted.
Supply voltage, AVDD to AGND
Supply voltage, BVDD to BGND
Supply voltage, BVDD to AVDD
Analog and reference input voltage with respect to AGND
Digital input voltage with respect to BGND
Ground voltage difference |AGND – BGND|
Input current to any pin except supply pins
Operating virtual junction temperature range, TJ
Storage temperature range, TSTG
Lead temperature 1.6mm (1/16in) from case for 10s
ADS7863
–0.3 to +6
–0.3 to +6
1.5 × AVDD
AGND – 0.3 to AVDD + 0.3
BGND – 0.3 to BVDD + 0.3
+0.3
–10 to +10
–40 to +150
–65 to +150
+250
UNIT
V
V
V
V
V
V
mA
°C
°C
°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.
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RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range, unless otherwise noted.
PARAMETER
Supply voltage, AVDD to AGND
Supply voltage, BVDD to BGND
Low voltage levels
5V logic levels
Reference input voltage on REFIN
Analog differential input voltage (CHxx+) – (CHxx–)
Operating ambient temperature range, TA
SBAS383 – JUNE 2007
MIN
2.7
1.65
4.5
0.5
–VREF
–40
ADS7863
NOM
5.0
5.0
2.5
MAX
5.5
3.6
5.5
2.525
+VREF
+125
UNIT
V
V
V
mV
°C
DISSIPATION RATINGS
PACKAGE
SSOP-24
QFN-24
(4mm x 4mm)
DERATING FACTOR ABOVE
TA = +25°C
10mW/°C
22mW/°C
TA +25°C
POWER RATING
1250mW
2740mW
TA = +70°C
POWER RATING
800mW
1750mW
TA = +85°C
POWER RATING
650mW
1420mW
TA = +125°C
POWER RATING
250mW
540mW
THERMAL CHARACTERISTICS(1)
Over operating free-air temperature range, unless otherwise noted.
θJA
θJC
PDISS
PARAMETER
Junction-to-air thermal resistance
Low-K thermal resistance
High-K thermal resistance
Junction-to-case thermal resistance
Device power dissipation at 5V
SSOP-24
99.8
61.0
23.3
40
QFN-24
45.6
33.1
35
40
UNIT
°C/W
°C/W
mW
(1) Tested in accordance with the Low-K or High-K thermal metric definitions of EIA/JESD51-3 for leaded surface-mount packages.
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ADS7863
SBAS383 – JUNE 2007
www.ti.com
ELECTRICAL CHARACTERISTICS
At TA = –40°C to +125°C, and AVDD = 5V, BVDD = 3.3V, VREF = 2.5V (internal), fCLK = 24MHz, and fSAMPLE = 1.5MSPS, unless
otherwise noted.
PARAMETER
RESOLUTION
ANALOG INPUT
FSR
Full-scale differential input range
VIN
CIN
CID
IIL
CMRR
Absolute input voltage
Input capacitance
Differential input capacitance
Input leakage current
Common-mode rejection ratio
DC ACCURACY
INL Integral nonlinearity
INL match
DNL
Differential nonlinearity(2)
DNL match
VOS
VOS match
dVOS/dT
GERR
GERR match
GERR/dT
PSRR
Input offset error
Input offset thermal drift
Gain error(2)
Gain error thermal drift
Power-supply rejection ratio
AC ACCURACY
SINAD
Signal-to-noise + distortion
SNR
Signal-to-noise ratio
THD
Total harmonic distortion
SFDR
Spurious-free dynamic range
SAMPLING DYNAMICS
tCONV
Conversion time per ADC
tACQ Acquisition time
tDATA
Throughput rate
tA Aperture delay
tA match
tAJIT Aperture jitter
fCLK Clock frequency on CLOCK
INTERNAL VOLTAGE REFERENCE
Resolution Reference output DAC resolution
VREFOUT
Reference output voltage
dVREFOUT/dT Reference voltage drift
DNLDAC
DAC differential nonlinearity
INLDAC
DAC integral nonlinearity
VOSDAC
DAC offset error
TEST CONDITIONS
(CHxx+) – (CHxx–)
CHxx+ or CHxx+ to AGND
CHxx+ or CHxx– to AGND
Asynchronous to Synchronous
2.7V < AVDD < 5.5V
VIN = 5VPP at 100kHz
VIN = 5VPP at 100kHz
VIN = 5VPP at 100kHz
VIN = 5VPP at 100kHz
1MHz < fCLK 24MHz
1MHz < fCLK 24MHz
Over 20%...100% DAC range
DAC = 0x3FF,
–40°C < TA < +125°C
DAC = 0x3FF at +25°C
VREFOUT = 0.5V
ADS7863
MIN
TYP (1)
12
MAX
UNIT
Bits
–VREF
–0.1
–1
+VREF
AVDD + 0.1
2
4
+1
80
V
V
pF
pF
nA
dB
–1 +1 LSB
LSB
–1 +1 LSB
LSB
–1 +1 LSB
LSB
μV/°C
0.25
%
%
ppm/°C
70 dB
70 dB
dB
–75 dB
75 dB
0.542
125
62.5
1
13 μs
ns
1500 kSPS
6 ns
50 ps
50 ps
24 MHz
10
0.496
2.480
2.485
–9.76
–4
–9.76
–4
2.500
2.500
±10
2.520
2.520
2.515
9.76
4
9.76
4
9.76
4
Bits
V
V
V
ppm/°C
mV
LSB
mV
LSB
mV
LSB
(1) All typical values at TA = +25°C.
(2) Ensured by design, not production tested.
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