serial interface. Typical power dissipation is 17.5mW
at a 500kHz throughput rate. The device can be
placed into a power-down mode which reduces dis-
sipation to just 2.5mW. The input range is –V
REF
to
+V
REF
, and the internal reference can be overdriven
by an external voltage.
Low power, small size, and high speed make the
ADS7835 ideal for battery-operated systems such
as wireless communication devices, portable multi-
channel data loggers, and spectrum analyzers. The
serial interface also provides low cost isolation for
remote data acquisition. The ADS7835 is avail-
able in an MSOP-8 package and is guaranteed over
the –40°C to +85°C temperature range.
APPLICATIONS
q
BATTERY-OPERATED SYSTEMS
q
DIGITAL SIGNAL PROCESSING
q
HIGH-SPEED DATA ACQUISITION
q
WIRELESS COMMUNICATION SYSTEMS
CLK
SAR
CONV
±2.5V
Input
2kΩ
CDAC
2kΩ
Serial
Interface
Comparator
DATA
S/H Amp
Buffer
Internal
+2.5V Ref
V
REF
10kΩ
±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
, and internal +2.5V reference, unless otherwise specified.
ADS7835E
PARAMETER
RESOLUTION
ANALOG
Input Voltage Range
Input Capacitance
Input Resistance
SYSTEM PERFORMANCE
No Missing Codes
Integral Linearity
Differential Linearity
Bipolar Offset Error
Positive Fulll-Scale Error
(3)
Negative Full-Scale Error
(3)
Noise
Power Supply Rejection Ratio
SAMPLING DYNAMICS
Conversion Time
Acquisition Time
Throughput Rate
Aperture Delay
Aperture Jitter
Step Response
DYNAMIC CHARACTERISTICS
Signal-to-Noise Ratio
Total Harmonic Distortion
(4)
Signal-to-(Noise+Distortion)
Spurious Free Dynamic Range
REFERENCE OUTPUT
Voltage
Source Current
(5)
Line Regulation
REFERENCE INPUT
Range
Resistance
(6)
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels:
V
IH
V
IL
V
OH
V
OL
Data Format
POWER SUPPLY REQUIREMENT
+V
CC
Quiescent Current
Power Dissipation
Power-Down
TEMPERATURE RANGE
Specified Performance
T
Specifications same as ADS7835E.
NOTES: (1) Ideal input span, does not include gain or offset error. (2) LSB means Least Significant Bit, with V
REF
equal to +2.5V, one LSB is 1.22mV. (3) Measured
relative to an ideal positive full scale of 2.499V for positive full-scale error. Measured relative to an ideal negative full scale of –2.499V for negative full-scale error.
(4) Calculated on the first nine harmonics of the input frequency. (5) If the internal reference is required to source current to an external load, the reference voltage
will change due to the internal 10kΩ resistor. (6) Can vary
±30%.
–40
V
IN
V
IN
V
IN
V
IN
=
=
=
=
5Vp-p
5Vp-p
5Vp-p
5Vp-p
at
at
at
at
10kHz
10kHz
10kHz
10kHz
INPUT
(1)
±2.5V
with the 2.5V
Internal Reference
During Conversion (CONV = LOW)
12
±1
±0.8
±2
±12
±12
200
0.3
1.625
0.350
500
5
30
375
72
–78
70
78
2.50
0.2
2.3
To Internal Reference Voltage
10
CMOS
I
IH
≤
+5µA
I
IL
≤
+5µA
I
OH
= –500µA
I
OL
= 500µA
3.0
–0.3
3.5
+V
CC
+ 0.3
0.8
T
T
T
T
T
T
T
T
T
T
T
V
mA
mA
mW
mW
°C
2.9
T
T
T
T
T
T
V
V
V
V
T
T
T
T
–82
72
82
T
T
T
T
T
T
±2
±10
±20
±35
±20
±35
–V
REF
25
2
T
±0.5
±0.5
±1
±7
±7
T
T
±1
±1
±5
±12
±25
±12
±25
CONDITIONS
MIN
TYP
12
+V
REF
T
T
T
MAX
MIN
ADS7835EB
TYP
T
T
MAX
UNITS
Bits
V
pF
kΩ
Bits
LSB
(2)
LSB
LSB
LSB
LSB
LSB
LSB
µVrms
LSB
µs
µs
kHz
ns
ps
ns
dB
dB
dB
dB
V
µA
mV
V
kΩ
At
–40°C
At
–40°C
25°C
to +85°C
25°C
to +85°C
Worst-Case
∆,
+V
CC
= 5V
±5%
–72
70
75
2.525
50
2.48
–75
68
72
2.475
I
OUT
= 0
Static Load
4.75V
≤
V
CC
≤
5.25V
2.52
T
0.4
Binary Two’s Complement
4.75
3.5
0.5
17.5
2.5
5.25
Specified Performance
f
SAMPLE
= 500kHz
Power-Down
30
T
+85
T
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.
®
ADS7835
2
ABSOLUTE MAXIMUM RATINGS
(1)
+V
CC
to GND ............................................................................ –0.3V to 6V
Analog Inputs to GND ............................................................. –5.3 to +5.3
Digital Inputs to GND ............................................... –0.3V to (V
CC
+ 0.3V)
Power Dissipation .......................................................................... 325mW
Maximum Junction Temperature ................................................... +150°C
Operating Temperature Range ......................................... –40°C to +85°C
Storage Temperature Range .......................................... –65°C to +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings” may
cause permanent damage to the device. Exposure to absolute maximum condi-
tions for extended periods may affect device reliability.
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from per-
formance degradation to complete device failure. Burr-Brown
Corporation recommends that all integrated circuits be
handled and stored using appropriate ESD protection meth-
ods.
ESD damage can range from subtle performance degrada-
tion 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
published specifications.
PIN CONFIGURATION
Top View
V
REF
A
IN
GND
GND
1
2
ADS7835
3
4
MSOP-8
8
7
6
5
+V
CC
CLK
DATA
CONV
PIN ASSIGNMENTS
PIN
1
2
3
4
5
6
NAME
V
REF
A
IN
GND
GND
CONV
DATA
DESCRIPTION
Reference Output. Decouple to ground with a 0.1µF ceramic capacitor and a 2.2µF tantalum capacitor.
±2.5V
Input
Ground
Ground
Convert Input. Controls the sample/hold mode, start of conversion, start of serial data transfer, type of serial transfer, and power-
down mode. See the Digital Interface section for more information.
Serial Data Output. The 12-bit conversion result is serially transmitted most significant bit first with each bit valid on the rising edge
of CLK. By properly controlling the CONV input, it is possibly to have the data transmitted least significant bit first. See the Digital
Interface section for more information.
Clock Input. Synchronizes the serial data transfer and determines conversion speed.
Power Supply. Decouple to ground with a 0.1µF ceramic capacitor and a 10µF tantalum capacitor.
7
8
CLK
+V
CC
PACKAGE/ORDERING INFORMATION
MAXIMUM
INTEGRAL
LINEARITY
ERROR
(LSB)
±2
±1
±2
±1
MAXIMUM
DIFFERENTIAL
LINEARITY
ERROR
(LSB)
N/S
(4)
±1
PRODUCT
ADS7835E
PACKAGE
MSOP-8
PACKAGE
DRAWING
NUMBER
(1)
337
SPECIFICATION
TEMPERATURE
RANGE
–40°C to +85°C
PACKAGE
MARKING
(2)
B35
ORDERING
NUMBER
(3)
ADS7835E/250
ADS7835E/2K5
ADS7835EB/250
ADS7835EB/2K5
ADS7835P
ADS7835PB
TRANSPORT
MEDIA
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Rails
Rails
"
ADS7835EB
"
"
"
"
"
MSOP-8
"
337
"
–40°C to +85°C
"
B35
"
ADS7835P
ADS7835PB
"
Plastic DIP-8
"
006
"
–40°C to +85°C
"
ADS7835P
ADS7835PB
N/S
(4)
±1
"
"
"
NOTE: (1) For detail drawing and dimension table, please see end of data sheet or Package Drawing File on Web. (2) Performance Grade information is marked
on the reel. (3) Models with a slash(/) are available only in Tape and reel in quantities indicated (e.g. /250 indicates 250 units per reel, /2K5 indicates 2500 devices
per reel). Ordering 2500 pieces of ”ADS7835E/2K5“ will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to the
www.burr-brown.com web site under Applications and Tape and Reel Orientation and Dimensions. (4) N/S = Not Specified, typical only. However, 12-Bits no missing
codes is guaranteed over temperature.
®
3
ADS7835
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, +V
CC
= +5V, f
SAMPLE
= 500kHz, f
CLK
= 16 • f
SAMPLE
, and internal +2.5V reference, unless otherwise specified.
CHANGE IN FULL-SCALE ERRORS
vs TEMPERATURE
1.0
0.0
CHANGE IN BIPOLAR OFFSET ERROR
vs TEMPERATURE
0.6
Negative Full-Scale Error
0.4
Delta from +25°C (LSB)
Delta from +25°C (LSB)
0.2
0.0
–0.2
–0.4
–0.6
–0.8
–1.0
–1.0
–2.0
Positive Full-Scale Error
–3.0
–4.0
–5.0
–40
–20
0
20
40
60
80
100
–40
–20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
POWER-DOWN SUPPLY CURRENT
vs TEMPERATURE
470
Power-Down Supply Current (µA)
3.8
3.7
SUPPLY CURRENT vs TEMPERATURE
460
Supply Current (mA)
450
440
430
420
410
400
390
–40
–20
0
20
40
60
80
100
Temperature (°C)
3.6
3.5
3.4
3.3
3.2
3.1
3.0
–40
f
SAMPLE
= 125kHz
f
SAMPLE
= 500kHz
–20
0
20
40
60
80
100
Temperature (°C)
SUPPLY CURRENT vs SAMPLE RATE
4.0
CHANGE IN INTEGRAL and DIFFERENTIAL LINEARITY
vs SAMPLE RATE
0.5
Supply Current (mA)
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
100
200
300
400
500
600
700
Delta from f
SAMPLE
= 500kHz (LSB)
3.9
0.4
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0
100
200
300
400
500
600
700
Change in Differential
Linearity (LSB)
Change in Integral
Linearity (LSB)
Sample Rate (kHz)
Sample Rate (kHz)
®
ADS7835
4
TYPICAL PERFORMANCE CURVES
(Cont.)
At T
A
= +25°C, +V
CC
= +5V, f
SAMPLE
= 500kHz, f
CLK
= 16 • f
SAMPLE
, and internal +2.5V reference, unless otherwise specified.
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