ADS803E
ADS803U
ADS803
12-Bit, 5MHz Sampling
ANALOG-TO-DIGITAL CONVERTER
TM
FEATURES
q
HIGH SFDR: 82dB at NYQUIST
q
HIGH SNR: 69dB
q
LOW POWER: 115mW
q
LOW DLE: 0.25LSB
q
SMALL 28-LEAD SSOP AND SOIC PACKAGES
q
FLEXIBLE INPUT RANGE
q
OVER-RANGE INDICATOR
APPLICATIONS
q
IF AND BASEBAND DIGITIZATION
q
CCD IMAGING SCANNERS
q
TEST INSTRUMENTATION
DESCRIPTION
The ADS803 is a high-speed, high dynamic range, 12-bit pipelined
analog-to-digital converter. This converter includes a high-band-
width track/hold that gives excellent spurious performance up to
and beyond the Nyquist rate. This high-bandwidth, linear track/hold
minimizes harmonics and has low jitter, leading to excellent SNR
performance. The ADS803 is also pin-compatible with the 10MHz
ADS804 and the 20MHz ADS805.
The ADS803 provides an internal reference and can be programmed
for a 2Vp-p input range for the best spurious performance and ease
of driving. Alternatively, the 5Vp-p input range can be used for the
lowest input referred noise of 0.09 LSBs rms giving superior
imaging performance. There is also a capability to set the input
range in between the 2Vp-p and 5Vp-p input ranges or to use
external reference. The ADS803 also provides an overrange indica-
tor flag to indicate an input range that exceeds the full-scale input
range of the converter. This flag can be used to reduce the gain of
the front end gain-ranging circuitry.
The ADS803 employs digital error correction techniques to provide
excellent differential linearity for demanding imaging applications.
Its low distortion and high SNR give the extra margin needed for
communications, medical imaging, video and test instrumentation
applications. The ADS803 is available in 28-lead SSOP and SOIC
packages.
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
1997 Burr-Brown Corporation
PDS-1398C
Printed in U.S.A. October, 1998
12-Bit
Pipelined
A/D Core
Reference and
Mode Select
Reference Ladder
and Driver
Timing Circuitry
Error
Correction
Logic
3-State
Outputs
T/H
D0
D11
CLK
+V
S
ADS803
VDRV
OE
SEL
REFB
V
REF
REFT
IN
V
IN
IN
CM
OVR
2
ADS803
SPECIFICATIONS
At T
A
= full specified temperature range, V
S
= +5V, specified input range = 1.5V to 3.5V, single-ended input and sampling rate = 5MHz, unless otherwise specified.
CMOS/TTL Compatible
Straight Offset Binary
CMOS/TTL Compatible
Straight Offset Binary
CMOS Compatible
Rising Edge of Convert Clock
CMOS Compatible
Rising Edge of Convert Clock
ADS803U
ADS803E
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
RESOLUTION
12 Guaranteed
T
(1)
Bits
SPECIFIED TEMPERATURE RANGE
40 to +85
40 to +85
C
CONVERSION CHARACTERISTICS
Sample Rate
10k
5M
T
T
Samples/s
Data Latency
6
T
Clk Cycles
ANALOG INPUT
Single-Ended Input Range
1.5
3.5
T
T
V
Standard Optional Single-Ended Input Range
0
5
T
T
V
Common-Mode Voltage
2.5
T
V
Standard Optional Common-Mode Voltage
1
T
V
Input Capacitance
20
T
pF
Track-Mode Input Bandwidth
3dBFS Input
270
T
MHz
DYNAMIC CHARACTERISTICS
Differential Linearity Error (Largest Code Error)
f = 500kHz
0.25
0.75
T
T
LSB
No Missing Codes
Guaranteed
Guaranteed
Spurious Free Dynamic Range
(2)
f = 2.48MHz (1dB input)
74
82
T
T
dBFS
Two-Tone Intermodulation Distortion
(4)
74
T
dBc
f = 1.8M and 1.9M (7dBFS each tone)
Signal-to-Noise Ratio (SNR)
f = 2.48MHz (1dB input)
66.5
69
T
T
dB
Signal-to-(Noise + Distortion) (SINAD)
f = 2.48MHz (1dB input)
65
68
T
T
dB
Effective Number of Bits at 2.48MHz
(5)
11
T
Bits
Input Referred Noise
0V to 5V Input
0.09
T
LSBs rms
1.5V to 3.5V Input
0.23
T
LSBs rms
Integral Nonlinearity Error
f = 500kHz
1
2
T
T
LSB
Aperture Delay Time
1
T
ns
Aperture Jitter
4
T
ps rms
Overvoltage Recovery Time
1.5 x FS Input
2
T
ns
Full-Scale Step Acquisition Time
50
T
ns
DIGITAL INPUTS
Logic Family
Convert Command
Start Conversion
High Level Input Current (V
IN
= 5V)
(6)
100
T
A
Low Level Input Current (V
IN
= 0V)
10
T
A
High Level Input Voltage
+3.5
T
V
Low Level Input Voltage
+1.0
T
V
Input Capacitance
5
T
pF
DIGITAL OUTPUTS
Logic Family
V
Logic Coding
Low Output Voltage
(I
OL
= 50
A)
0.1
T
V
Low Output Voltage
(I
OL
= 1.6mA)
0.4
T
V
High Output Voltage
(I
OH
= 50
A)
+4.5
T
V
High Output Voltage
(I
OH
= 0.5mA)
+2.4
T
V
3-State Enable Time
OE = L
20
40
T
T
ns
3-State Disable Time
OE = H
2
10
T
T
ns
Output Capacitance
5
T
pF
ACCURACY (5Vp-p Input Range)
Zero Error (Referred to FS)
At 25
C
0.2
1.5
T
T
%FS
Zero Error Drift (Referred to FS)
5
T
ppm/
C
Gain Error
(7)
At 25
C
2.0
T
%FS
Gain Error Drift
(7)
15
T
ppm/
C
Gain Error
(8)
At 25
C
1.5
T
%FS
Gain Error Drift
(8)
15
T
ppm/
C
Power Supply Rejection of Gain
V
S
=
5%
60
82
T
T
dB
Reference Input Resistance
1.6
T
k
Internal Voltage Reference Tolerance (V
REF
= 2.5V)
At 25
C
35
T
mV
Internal Voltage Reference Tolerance (V
REF
= 1.0V)
At 25
C
14
T
mV
3
ADS803
POWER SUPPLY REQUIREMENTS
Supply Voltage: +V
S
Operating
+4.7
+5.0
5.3
T
T
T
V
Supply Current: +I
S
Operating
23
27
T
T
mA
Power Dissipation
Operating
115
135
T
T
mW
Thermal Resistance,
JA
28-Lead SOIC
75
C/W
28-Lead SSOP
50
C/W
NOTES: (1) An asterisk (
T
) indicates same specifications as the ADS803U. (2) Spurious Free Dynamic Range refers to the magnitude of the largest harmonic.
(3) dBFS means dB relative to full scale. (4) Two-tone intermodulation distortion is referred to the largest fundamental tone. This number will be 6dB higher if it
is referred to the magnitude of the two-tone fundamental envelope. (5) Effective number of bits (ENOB) is defined by (SINAD 1.76)/6.02. (6) Internal 50k
pull-
down resistor. (7) Includes internal reference. (8) Excludes internal reference.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
SPECIFICATIONS
(CONT)
At T
A
= full specified temperature range, V
S
= +5V, specified input range = 1.5V to 3.5V, single-ended input and sampling rate = 5MHz, unless otherwise specified.
ADS803U
ADS803E
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
+V
S
....................................................................................................... +6V
Analog Input ........................................................... (0.3V) to (+V
S
+0.3V)
Logic Input ............................................................. (0.3V) to (+V
S
+0.3V)
Case Temperature ......................................................................... +100
C
Junction Temperature .................................................................... +150
C
Storage Temperature ..................................................................... +150
C
ABSOLUTE MAXIMUM RATINGS
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
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.
PRODUCT
DEMO BOARD
ADS803U
DEM-ADS80xU
DEMO BOARD ORDERING INFORMATION
PACKAGE
SPECIFIED
DRAWING
TEMPERATURE
PACKAGE
ORDERING
TRANSPORT
PRODUCT
PACKAGE
NUMBER
(1)
RANGE
MARKING
NUMBER
MEDIA
ADS803U
SO-28 Surface Mount
217
40
C to +85
C
ADS803U
ADS803U
Rails
ADS803E
SSOP-28 Surface Mount
324
40
C to +85
C
ADS803E
ADS803E
Rails
"
"
"
"
"
ADS803E/1K
Tape and Reel
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. For detailed Tape and Reel
mechanical information refer to Appendix B of Burr-Brown IC Data Book.
PACKAGE/ORDERING INFORMATION
4
ADS803
PIN CONFIGURATION
PIN
DESIGNATOR
DESCRIPTION
1
OVR
Over Range Indicator
2
B1
Data Bit 1 (MSB)
3
B2
Data Bit 2
4
B3
Data Bit 3
5
B4
Data Bit 4
6
B5
Data Bit 5
7
B6
Data Bit 6
8
B7
Data Bit 7
9
B8
Data Bit 8
10
B9
Data Bit 9
11
B10
Data Bit 10
12
B11
Data Bit 11
13
B12
Data Bit 12 (LSB)
14
CLK
Convert Clock Input
15
OE
Output Enable
16
+V
S
+5V Supply
17
GND
Ground
18
SEL
Input Range Select
19
V
REF
Reference Voltage Select
20
REFB
Bottom Reference
21
CM
Common-Mode Voltage
22
REFT
Top Reference
23
IN
Complementary Analog Input
24
GND
Analog Ground
25
IN
Analog Input (+)
26
GND
Analog Ground
27
+V
S
+5V Supply
28
VDRV
Output Driver Voltage
PIN DESCRIPTIONS
Top View
SOIC/SSOP
6 Clock Cycles
Data Invalid
t
D
t
L
t
H
t
CONV
N6
N5
N4
N3
N2
N-1
N
N+1
Data Out
Clock
Analog In
N
t
2
N+1
N+2
N+3
N+4
N+5
N+6
N+7
t
1
TIMING DIAGRAM
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
CONV
Convert Clock Period
200
100
s
ns
t
L
Clock Pulse Low
96
99
ns
t
H
Clock Pulse High
96
99
ns
t
D
Aperture Delay
3
ns
t
1
Data Hold Time, C
L
= 0pF
3.9
ns
t
2
New Data Delay Time, C
L
= 15pF max
12
ns
OVR
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
CLK
VDRV
+V
S
GND
IN
GND
IN
REFT
CM
REFB
VREF
SEL
GND
+V
S
OE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADS803
5
ADS803
SPECTRAL PERFORMANCE
Frequency (MHz)
Amplitude (dB)
0
0.5
1.0
1.5
2.0
2.5
0
20
40
60
80
100
120
f
IN
= 500kHz
FREQUENCY SPECTRUM
Frequency (MHz)
Magnitude (dBFSR)
0
0.5
1.0
1.5
2.0
2.5
0
20
40
60
80
100
120
f
1
= 1.8MHz at 7dB
f
2
= 1.9MHz at 7dB
IMD (3) = 74dBc
INTEGRAL LINEARITY ERROR
Output Code
ILE (LSB)
0
1024
2048
3072
4096
4.0
2.0
0
2.0
4.0
f
IN
= 500kHz
DIFFERENTIAL LINEARITY ERROR
Output Code
DLE (LSB)
0
1024
2048
3072
4096
1.0
0.5
0
0.5
1.0
f
IN
= 500kHz
SPECTRAL PERFORMANCE
Frequency (MHz)
Amplitude (dB)
0
0.5
1.0
1.5
2.0
2.5
0
20
40
60
80
100
120
f
IN
= 2.48MHz
100
80
60
40
20
0
SWEPT POWER SFDR
SFDR (dBFS, dBc)
60
50
40
30
20
10
0
Input Amplitude (dBFS)
dBFS
dBc
f
IN
= 2.48MHz
TYPICAL PERFORMANCE CURVES
At T
A
= full specified temperature range, V
S
= +5V, specified input range = 1.5V to 3.5V, single-ended input and sampling rate = 5MHz, unless otherwise specified.
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