Burr Brown Corporation ADS7822UC-2K5, ADS7822UC, ADS7822UB-2K5, ADS7822UB, ADS7822EC-250 Datasheet
...
®
OPA658
ADS7822
ADS7822
For most current data sheet and other product
information, visit www.burr-brown.com
ADS7822
12-Bit High Speed 2.7V
ANALOG-TO-DIGITAL CONVERTER
FEATURES
● 75kHz SAMPLING RATE
● MICRO POWER:
0.54mW at 75kHz
0.06mW at 7.5kHz
● POWER DOWN: 3µA max
● MINI-DIP-8, SOIC-8, AND MSOP-8
● DIFFERENTIAL INPUT
● SERIAL INTERFACE
APPLICATIONS
● BATTERY OPERATED SYSTEMS
● REMOTE DATA ACQUISITION
● ISOLATED DATA ACQUISITION
● SIMULTANEOUS SAMPLING,
MULTI-CHANNEL SYSTEMS
micro
Power Sampling
DESCRIPTION
The ADS7822 is a 12-bit sampling analog-to-digital
converter (A/D) with guaranteed specifications over a
2.7V to 3.6V supply range. It requires very little power
even when operating at the full 75kHz rate. At lower
conversion rates, the high speed of the device enables
it to spend most of its time in the power down mode—
the power dissipation is less than 60µW at 7.5kHz.
The ADS7822 also features operation from 2.0V to
5V, a synchronous serial interface, and a differential
input. The reference voltage can be set to any level
within the range of 50mV to VCC.
Ultra low power and small size make the ADS7822
ideal for battery operated systems. It is also a perfect
fit for remote data acquisition modules, simultaneous
multi-channel systems, and isolated data acquisition.
The ADS7822 is available in a plastic mini-DIP-8, an
SOIC-8, or an MSOP-8 package.
SAR
V
REF
+In
–In
S/H Amp
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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©
1996 Burr-Brown Corporation PDS-1358C Printed in U.S.A., May, 2000
CDAC
Comparator
Control
Serial
Interface
D
OUT
DCLOCK
CS/SHDN
SPECIFICATIONS
At –40°C to +85°C, +VCC = +2.7V, V
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT
Full-Scale Input Span +In – (–In) 0 V
Absolute Input Range +In –0.2
Capacitance 25 ✻✻pF
Leakage Current ±1 ✻✻µA
SYSTEM PERFORMANCE
Resolution 12 ✻✻Bits
No Missing Codes 11 12 ✻ Bits
Integral Linearity Error ±0.5 ±2 ±0.5 ±1 ±0.25 ±0.75 LSB
Differential Linearity Error ±0.5 ±2 ±0.5 ±1 ±0.25 ±0.75 LSB
Offset Error ±3 ✻ ±1 LSB
Gain Error ±3 ✻ ±1 LSB
Noise 33 ✻✻µVrms
Power Supply Rejection 82 ✻✻dB
SAMPLING DYNAMICS
Conversion Time 12 ✻✻
Acquisition Time 1.5 ✻✻
Throughput Rate 75 ✻✻kHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion V
SINAD V
Spurious Free Dynamic Range V
REFERENCE INPUT
Voltage Range 0.05 V
Resistance
Current Drain At Code 710h 8
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻✻
Logic Levels:
V
IH
V
IL
V
OH
V
OL
Data Format Straight Binary ✻✻
POWER SUPPLY REQUIREMENTS
V
CC
Quiescent Current 200 325 ✻✻ ✻✻µA
Power Down CS = V
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻✻✻°C
✻ Specifications same as ADS7822.
Notes: (1) LSB means Least Significant Bit. With V
power supply range. (3) See the Typical Performance Curves for more information. (4) f
Power Dissipation section for more information regarding lower sample rates.
= +2.5V, f
REF
SAMPLE
= 75kHz, f
CLK
= 16 • f
, unless otherwise specified.
SAMPLE
ADS7822 ADS7822B ADS7822C
REF
V
–In –0.2 +1.0 ✻✻✻✻V
CC
✻✻✻✻V
+0.2
✻✻✻✻V
Clk Cycles
Clk Cycles
= 2.5Vp-p at 1kHz –82 ✻✻dB
IN
= 2.5Vp-p at 1kHz 71 ✻✻dB
IN
= 2.5Vp-p at 1kHz 86 ✻✻dB
IN
CS = GND, f
CS = V
f
SAMPLE
CS = V
SAMPLE
CC
= 0Hz
5 ✻✻GΩ
5 ✻✻GΩ
CC
40
= 7.5kHz 0.8 ✻✻µA
CC
0.001
3
✻✻✻✻V
✻✻ ✻✻µA
✻✻ ✻✻µA
IIH = +5µA 2.0 5.5 ✻✻✻✻V
IIL = +5µA –0.3 0.8 ✻✻✻✻V
IOH = –250µA 2.1 ✻✻V
IOL = 250µA 0.4 ✻✻V
Specified Performance 2.7 3.6 ✻✻✻✻V
See Notes 2 and 3 2.0 2.7 ✻✻✻✻V
See Note 3 3.6 5.25 ✻✻✻✻V
f
SAMPLE
f
SAMPLE
= 7.5kHz
(4,5)
= 7.5kHz
(5)
CC
equal to +2.5V, one LSB is 0.61mV. (2) The maximum clock rate of the ADS7822 is less than 1.2MHz in this
REF
20 ✻✻µA
180 ✻✻µA
3 ✻✻µA
= 1.2MHz, CS = VCC for 145 clock cycles out of every 160. (5) See the
CLK
(1)
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.
®
ADS7822
2
ABSOLUTE MAXIMUM RATINGS
VCC.......................................................................................................+6V
Analog Input ..............................................................–0.3V to (V
Logic Input ...............................................................................–0.3V to 6V
Case Temperature ......................................................................... +100°C
Junction Temperature .................................................................... +150°C
Storage Temperature..................................................................... +125°C
External Reference Voltage .............................................................. +5.5V
NOTE: (1) Stresses above these ratings may permanently damage the device.
(1)
+ 0.3V)
CC
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from performance degradation to complete device failure. BurrBrown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.
ESD damage can range from subtle performance degrada-
PIN CONFIGURATION
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
V
REF
+In
–In
GND
1
2
ADS7822
3
4
PDIP-8,
SOIC-8,
MSOP-8
8
7
6
5
+V
CC
DCLOCK
D
OUT
CS/SHDN
published specifications.
PIN ASSIGNMENTS
PIN NAME DESCRIPTION
1V
2 +In Non Inverting Input.
3 –In Inverting Input. Connect to ground or to remote ground sense point.
4 GND Ground.
5 CS/SHDN Chip Select when LOW, Shutdown Mode when HIGH.
6D
7 DCLOCK Data Clock synchronizes the serial data transfer and determines conversion speed.
8+V
REF
OUT
Reference Input.
The serial output data word is comprised of 12 bits of data. In operation the data is valid on the falling edge of DCLOCK. The
second clock pulse after the falling edge of CS enables the serial output. After one null bit the data is valid for the next 12 edges.
Power Supply.
CC
PACKAGE/ORDERING INFORMATION
MAXIMUM MAXIMUM
INTEGRAL DIFFERENTIAL
LINEARITY LINEARITY PACKAGE SPECIFICATION
PRODUCT (LSB) (LSB) PACKAGE NUMBER
ADS7822E ±2 ±2 MSOP-8 337 –40°C to +85°C A22 ADS7822E/250 Tape and Reel
ADS7822E
ADS7822EB ±1 ±1 MSOP-8 337 –40°C to +85°C A22 ADS7822EB/250 Tape and Reel
ADS7822EB
ADS7822EC ±0.75 ±0.75 MSOP-8 337 –40°C to +85°C A22 ADS7822EC/250 Tape and Reel
ADS7822EC
ADS7822P ±2 ±2 Plastic DIP-8 006 –40°C to +85°C ADS7822P ADS7822P Rails
ADS7822PB ±1 ±1 Plastic DIP-8 006 –40°C to +85°C ADS7822PB ADS7822PB Rails
ADS7822PC ±0.75 ±0.75 Plastic DIP-8 006 –40°C to +85°C ADS7822PC ADS7822PC Rails
ADS7822U ±2 ±2 SOIC-8 182 –40°C to +85°C ADS7822U ADS7822U Rails
ADS7822U
ADS7822UB ±1 ±1 SOIC-8 182 –40°C to +85°C ADS7822UB ADS7822UB Rails
ADS7822UB
ADS7822UC ±0.75 ±0.75 SOIC-8 182 –40°C to +85°C ADS7822UC ADS7822UC Rails
ADS7822UC
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 ”ADS7822E/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.
ERROR ERROR DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT
""""""ADS7822E/2K5 "
""""""ADS7822EB/2K5 "
""""""ADS7822EC/2K5 "
""""""ADS7822U/2K5 Tape and Reel
""""""ADS7822UB/2K5 Tape and Reel
""""""ADS7822UC/2K5 Tape and Reel
(1)
RANGE MARKING
(2)
NUMBER
(3)
MEDIA
®
3
ADS7822
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VCC = +2.7V, V
= +2.5V, f
REF
SAMPLE
= 75kHz, f
CLK
= 16 • f
, unless otherwise specified.
SAMPLE
1.00
INTEGRAL LINEARITY ERROR vs CODE
0.75
0.50
0.25
0.00
–0.25
–0.50
Integral Linearity Error (LSB)
–0.75
–1.00
0 2048 4095
350
SUPPLY CURRENT vs TEMPERATURE
300
250
Code
1.00
DIFFERENTIAL LINEARITY ERROR vs CODE
0.75
0.50
0.25
0.00
–0.25
–0.50
–0.75
Differential Linearity Error (LSB)
–1.00
0 2048 4095
Code
POWER DOWN SUPPLY CURRENT
vs TEMPERATURE
120
100
80
200
150
Supply Current (µA)
100
50
–50 –25 0 25 50 75 100
Temperature (°C)
QUIESCENT CURRENT vs V
CC
400
350
300
250
200
Quiescent Current (µA)
150
100
12345
V
(V)
CC
60
40
Supply Current (nA)
20
0
–50 –25 0 25 50 75 100
Temperature (°C)
MAXIMUM SAMPLE RATE vs V
CC
1000
100
10
Sample Rate (kHz)
1
12345
V
(V)
CC
®
ADS7822
4
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