The ADS7813 is a low-power, single +5V supply, 16-
bit sampling analog-to-digital converter. It contains a
complete 16-bit capacitor-based SAR A/D with a
sample/hold, clock, reference, and serial data inter-
face.
The converter can be configured for a variety of input
ranges including
±10V, ±5V,
0V to 10V, and 0.5V to
4.5V. A high impedance 0.3V to 2.8V input range is
also available (input impedance > 10MΩ). For most
input ranges, the input voltage can swing to +16.5V or
–16.5V without damage to the converter.
A flexible SPI compatible serial interface allows data
to be synchronized to an internal or external clock.
The ADS7813 is specified at a 40kHz sampling rate
over the –40°C to +85°C temperature range. It is
available in a 16-pin 0.3" plastic DIP or a 16-lead
SOIC package.
APPLICATIONS
q
MEDICAL INSTRUMENTATION
q
DATA ACQUISITION SYSTEMS
q
ROBOTICS
q
INDUSTRIAL CONTROL
q
TEST EQUIPMENT
q
DIGITAL SIGNAL PROCESSING
q
DSP SERVO CONTROL
40kΩ
(1)
R1
IN
8kΩ
(1)
R2
IN
BUSY
PWRD
CONV
CS
Successive Approximation Register and Control Logic
Clock
CDAC
EXT/INT
Serial
20kΩ
(1)
R3
IN
BUF
CAP
REF
Buffer
4kΩ
(1)
Internal
+2.5V Ref
Comparator
Data
Out
DATACLK
DATA
NOTE: (1) Actual value may vary ±30%.
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
using internal reference, unless otherwise specified.
ADS7813P, U
PARAMETER
RESOLUTION
ANALOG INPUT
Voltage Range
Impedance
Capacitance
THROUGHPUT SPEED
Conversion Time
Complete Cycle
Throughput Rate
DC ACCURACY
Integral Linearity Error
Differential Linearity Error
No Missing Codes
Transition Noise
(2)
Full Scale Error
(3)
Full Scale Error Drift
Full Scale Error
(3)
Full Scale Error Drift
Bipolar Zero Error
Bipolar Zero Error Drift
Unipolar Zero Error
Unipolar Zero Error Drift
Recovery Time to Rated Accuracy
from Power Down
(4)
Power Supply Sensitivity
AC ACCURACY
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-(Noise+Distortion)
Signal-to-Noise
Useable Bandwidth
(6)
Full Power –3dB Bandwidth
SAMPLING DYNAMICS
Aperture Delay
Aperture Jitter
Transient Response
Overvoltage Recovery
(7)
REFERENCE
Internal Reference Voltage
Internal Reference Source Current
Internal Reference Drift
External Reference Voltage Range
External Reference Current Drain
DIGITAL INPUTS
Logic Levels
V
IL
V
IH
I
IL
I
IH
DIGITAL OUTPUTS
Data Format
Data Coding
V
OL
V
OH
Leakage Current
Output Capacitance
See Table I
See Table I
35
20
25
40
±3
+3, –2
15
0.6
±14
Ext. 2.5000V Ref
Ext. 2.5000V Ref
Bipolar Ranges
Bipolar Ranges
Unipolar Ranges
Unipolar Ranges
1.0µF Capacitor to CAP
+4.75V < (V
S
= +5V) < +5.25
f
IN
=
f
IN
=
f
IN
=
f
IN
=
1kHz
1kHz
1kHz
1kHz
90
85
85
100
–98
89
89
130
600
40
20
5
750
2.48
2.5
100
8
2.5
2.52
T
±5
±3
±3
300
±0.5
T
±0.5
T
±10
T
±6
T
T
±12
96
–90
87
87
102
–100
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
±0.25
16
T
±0.25
T
T
T
±2
+2, –1
CONDITIONS
MIN
TYP
MAX
16
T
T
T
T
T
MIN
ADS7813PB, UB
TYP
MAX
T
UNITS
Bits
pF
µs
µs
kHz
LSB
(1)
LSB
Bits
LSB
%
ppm/°C
%
ppm/°C
mV
ppm/°C
mV
ppm/°C
µs
LSB
dB
(5)
dB
dB
dB
kHz
kHz
ns
ps
µs
ns
V
µA
ppm/°C
V
µA
Acquire and Convert
–96
FS Step
2.3
V
REF
= +2.5V
2.7
100
T
T
T
–0.3
+2.0
+0.8
V
S
+0.3V
±10
±10
T
T
T
T
T
T
V
V
µA
µA
I
SINK
= 1.6mA
I
SOURCE
= 500µA
High-Z State,
V
OUT
= 0V to V
S
High-Z State
+4
Serial
Binary Two’s Complement
+0.4
T
±1
15
T
T
15
V
V
µA
pF
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.
®
ADS7813
2
SPECIFICATIONS
(CONT)
At T
A
= –40°C to +85°C, f
S
= 40kHz, V
S
= +5V
±5%,
using internal reference, unless otherwise specified.
ADS7813P, U
PARAMETER
POWER SUPPLY
V
S
Power Dissipation
TEMPERATURE RANGE
Specified Performance
Derated Performance
T
Same specification as grade to the left.
NOTES: (1) LSB means Least Significant Bit. For the
±10V
input range, one LSB is 305µV. (2) Typical rms noise at worst case transitions and temperatures.
(3) Full scale error is the worst case of –Full Scale or +Full Scale untrimmed deviation from ideal first and last code transitions, divided by the transition voltage
(not divided by the full-scale range) and includes the effect of offset error. (4) After the ADS7813 is initially powered on and fully settles, this is the time delay
after it is brought out of Power Down Mode until all internal settling occurs and the analog input is acquired to rated accuracy, and normal conversions can begin
again. (5) All specifications in dB are referred to a full-scale input. (6) Useable Bandwidth defined as Full-Scale input frequency at which Signal-to-
(Noise+Distortion) degrades to 60dB, or 10 bits of accuracy. (7) Recovers to specified performance after 2 x FS input overvoltage.
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