Burr Brown Products
from Texas Instruments
AD
S7
ADS7863
863
AD
S78
63
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)
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 AV
DD
and 1.65V to 5.5V for
BV
DD
), 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.
SAR
AV
DD
CHA0+
CHA0-
CHA1+
CHA1-
Input
MUX
S/H
CDAC
Comparator
BV
DD
SDOA
SDOB
M0
APPLICATIONS
•
•
•
Motor Control
Multi-Axis Positioning Systems
Three-Phase Power Control
Serial Interface
M1
SDI
CLOCK
CS
RD
CHB0+
CHB0-
CHB1+
CHB1-
REF
IN
SAR
Input
MUX
S/H
CDAC
Comparator
BUSY
CONVST
BGND
REF
OUT
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
PRODUCT PREVIEW
ADS7863
www.ti.com
SBAS383 – JUNE 2007
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
PACKAGE-LEAD
SSOP-24
ADS7863I
4x4 QFN-24
(1)
RGE
PACKAGE
DESIGNATOR
DBQ
ORDERING NUMBER
ADS7863IDBQ
ADS7863IDBQR
ADS7863IRGE
ADS7863IRGER
TRANSPORT MEDIA,
QUANTITY
Tube, 56
Tape and Reel, 2500
Tape and Reel, 250
Tape and Reel, 3000
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.
ADS7863
Supply voltage, AV
DD
to AGND
Supply voltage, BV
DD
to BGND
Supply voltage, BV
DD
to AV
DD
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, T
J
Storage temperature range, T
STG
Lead temperature 1.6mm (1/16in) from case for 10s
(1)
–0.3 to +6
–0.3 to +6
1.5
×
AV
DD
AGND – 0.3 to AV
DD
+ 0.3
BGND – 0.3 to BV
DD
+ 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
PRODUCT PREVIEW
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.
2
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ADS7863
www.ti.com
SBAS383 – JUNE 2007
RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range, unless otherwise noted.
ADS7863
PARAMETER
Supply voltage, AV
DD
to AGND
Supply voltage, BV
DD
to BGND
Reference input voltage on REF
IN
Analog differential input voltage (CHxx+) – (CHxx–)
Operating ambient temperature range, T
A
Low voltage levels
5V logic levels
MIN
2.7
1.65
4.5
0.5
–V
REF
–40
5.0
2.5
NOM
5.0
MAX
5.5
3.6
5.5
2.525
+V
REF
+125
UNIT
V
V
V
mV
°C
DISSIPATION RATINGS
PACKAGE
SSOP-24
QFN-24
(4mm x 4mm)
DERATING FACTOR ABOVE
T
A
= +25°C
10mW/°C
22mW/°C
T
A
≤
+25°C
POWER RATING
1250mW
2740mW
T
A
= +70°C
POWER RATING
800mW
1750mW
T
A
= +85°C
POWER RATING
650mW
1420mW
T
A
= +125°C
POWER RATING
250mW
540mW
Over operating free-air temperature range, unless otherwise noted.
PARAMETER
θ
JA
θ
JC
P
DISS
(1)
Junction-to-air thermal resistance
Junction-to-case thermal resistance
Device power dissipation at 5V
Low-K thermal resistance
High-K thermal resistance
SSOP-24
99.8
61.0
23.3
40
QFN-24
45.6
33.1
35
40
UNIT
°C/W
°C/W
mW
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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3
PRODUCT PREVIEW
THERMAL CHARACTERISTICS
(1)
ADS7863
www.ti.com
SBAS383 – JUNE 2007
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to +125°C, and AV
DD
= 5V, BV
DD
= 3.3V, V
REF
= 2.5V (internal), f
CLK
= 24MHz, and f
SAMPLE
= 1.5MSPS, unless
otherwise noted.
ADS7863
PARAMETER
RESOLUTION
ANALOG INPUT
FSR
V
IN
C
IN
C
ID
I
IL
CMRR
Full-scale differential input range
Absolute input voltage
Input capacitance
Differential input capacitance
Input leakage current
Common-mode rejection ratio
–1
80
(CHxx+) – (CHxx–)
CHxx+ or CHxx+ to AGND
CHxx+ or CHxx– to AGND
–V
REF
–0.1
2
4
+1
+V
REF
AV
DD
+ 0.1
V
V
pF
pF
nA
dB
TEST CONDITIONS
MIN
12
TYP
(1)
MAX
UNIT
Bits
DC ACCURACY
INL
INL match
DNL
DNL match
V
OS
Input offset error
Asynchronous to Synchronous
Input offset thermal drift
Gain error
(2)
Integral nonlinearity
Differential nonlinearity
(2)
–1
+1
LSB
LSB
–1
+1
LSB
LSB
–1
+1
LSB
LSB
μV/°C
PRODUCT PREVIEW
4
V
OS
match
dV
OS
/dT
G
ERR
G
ERR
match
G
ERR
/dT
PSRR
Gain error thermal drift
Power-supply rejection ratio
0.25
%
%
ppm/°C
2.7V < AV
DD
< 5.5V
V
IN
= 5V
PP
at 100kHz
V
IN
= 5V
PP
at 100kHz
V
IN
= 5V
PP
at 100kHz
V
IN
= 5V
PP
at 100kHz
1MHz < f
CLK
≤
24MHz
1MHz < f
CLK
≤
24MHz
75
70
70
dB
AC ACCURACY
SINAD
SNR
THD
SFDR
Signal-to-noise + distortion
Signal-to-noise ratio
Total harmonic distortion
Spurious-free dynamic range
dB
dB
–75
dB
dB
SAMPLING DYNAMICS
t
CONV
t
ACQ
t
DATA
t
A
t
A
match
t
AJIT
f
CLK
Resolution
Aperture jitter
Clock frequency on CLOCK
1
Conversion time per ADC
Acquisition time
Throughput rate
Aperture delay
50
50
24
0.542
125
62.5
1500
6
13
μs
ns
kSPS
ns
ps
ps
MHz
INTERNAL VOLTAGE REFERENCE
Reference output DAC resolution
Over 20%...100% DAC range
V
REFOUT
Reference output voltage
DAC = 0x3FF,
–40°C < T
A
< +125°C
DAC = 0x3FF at +25°C
dV
REFOUT
/dT
DNL
DAC
INL
DAC
V
OSDAC
Reference voltage drift
DAC differential nonlinearity
–9.76
–4
–9.76
–4
V
REFOUT
= 0.5V
10
0.496
2.480
2.485
2.500
2.500
±10
9.76
4
9.76
4
9.76
4
2.520
2.520
2.515
Bits
V
V
V
ppm/°C
mV
LSB
mV
LSB
mV
LSB
DAC integral nonlinearity
DAC offset error
(1)
(2)
All typical values at T
A
= +25°C.
Ensured by design, not production tested.
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ADS7863
www.ti.com
SBAS383 – JUNE 2007
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= –40°C to +125°C, and AV
DD
= 5V, BV
DD
= 3.3V, V
REF
= 2.5V (internal), f
CLK
= 24MHz, and f
SAMPLE
= 1.5MSPS, unless
otherwise noted.
ADS7863
PARAMETER
INTERNAL VOLTAGE REFERENCE, continued
PSRR
I
REFOUT
I
REFSC
t
REFON
V
REF
I
REF
C
REF
Logic family
V
IH
V
IL
I
IN
C
IN
Logic family
V
OH
V
OL
I
OZ
C
OUT
C
LOAD
AV
DD
BV
DD
High-level output voltage
Low-level output voltage
High-impedance-state output current
Output capacitance
Load capacitance
I
OH
= –100μA
I
OH
= 100μA
V
IN
= BV
DD
to BGND
–50
5
30
BV
DD
– 0.2
0.2
+50
High-level input voltage
Low-level input voltage
Input current
Input capacitance
V
IN
= BV
DD
to BGND
0.7
×
BV
DD
–0.3
–50
5
Power-supply rejection ratio
Reference output dc current
Reference output short-circuit current
Reference output settling time
100
1
dB
mA
mA
μs
TEST CONDITIONS
MIN
TYP
(1)
MAX
UNIT
VOLTAGE REFERENCE INPUT
Reference input voltage range
Reference input current
Reference input capacitance
0.5
2.5
50
10
2.525
V
μA
pF
DIGITAL INPUTS
CMOS
BV
DD
+ 0.3
0.3
×
BV
DD
+50
V
V
nA
pF
DIGITAL OUTPUTS
CMOS
V
V
nA
pF
pF
POWER SUPPLY
Analog supply voltage
Buffer I/O supply voltage
AV
DD
to AGND
BV
DD
to BGND
AV
DD
= 3V
AV
DD
= 5.5V
AI
DD
Analog supply current
AV
DD
= 3V, NAP power-down
AV
DD
= 5.5V, NAP power-down
AV
DD
= 3V, deep power-down
AV
DD
= 5.5V, deep power-down
BI
DD
P
DISS
Buffer I/O supply current
Power dissipation
AV
DD
= 3V
AV
DD
= 5.5V
18.9
40
μA
μW
2.7
1.65
5.0
3.3
6
7
5.5
5.5
7
8
μA
V
V
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5
PRODUCT PREVIEW
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