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Burr-Brown Corporation

ADS7842 Datasheet Preview

ADS7842 Datasheet

12-Bit/ 4-Channel Parallel Output Sampling ANALOG-TO-DIGITAL CONVERTER

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®
ADS7842
ADS7842
For most current data sheet and other product
information, visit www.burr-brown.com
12-Bit, 4-Channel Parallel Output Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q SINGLE SUPPLY: 2.7V to 5V
q 4-CHANNEL INPUT MULTIPLEXER
q UP TO 200kHz SAMPLING RATE
q FULL 12-BIT PARALLEL INTERFACE
q ±1 LSB INL AND DNL
q GUARANTEED NO MISSING CODES
q 72dB SINAD
q LOW POWER: 2mW
q SSOP-28 PACKAGE
APPLICATIONS
q DATA ACQUISITION
q TEST AND MEASUREMENT
q INDUSTRIAL PROCESS CONTROL
q MEDICAL INSTRUMENTS
q LABORATORY EQUIPMENT
DESCRIPTION
The ADS7842 is a complete, 4-channel, 12-bit analog-
to-digital converter (ADC). It contains a 12-bit, ca-
pacitor-based, SAR A/D with a sample-and-hold am-
plifier, interface for microprocessor use and parallel,
three-state output drivers. The ADS7842 is specified
at a 200kHz sampling rate while dissipating only
2mW of power. The reference voltage can be varied
from 100mV to VCC with a corresponding LSB reso-
lution from 24µV to 1.22mV. The ADS7842 is guar-
anteed down to 2.7V operation.
Low power, high speed and an on-board multiplexer
make the ADS7842 ideal for battery-operated sys-
tems such as portable, multi-channel dataloggers and
measurement equipment. The ADS7842 is available
in a SSOP-28 package and is guaranteed over the
–40°C to +85°C temperature range.
AIN0
AIN1
AIN2
AIN3
VREF
A0 A1
4-Channel
MUX
SAR
ADS7842
CDAC
Comparator
Output
Latches
and
Three
State
Drivers
Three
State
Parallel
Data Bus
CLK
BUSY
WR
CS
RD
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
©1998 Burr-Brown Corporation
PDS-1484B
Printed in U.S.A. March, 2000




Burr-Brown Corporation

ADS7842 Datasheet Preview

ADS7842 Datasheet

12-Bit/ 4-Channel Parallel Output Sampling ANALOG-TO-DIGITAL CONVERTER

No Preview Available !

SPECIFICATIONS: +5V
At TA = –40°C to +85°C, +VCC = +5V, VREF = +5V, fSAMPLE = 200kHz, and fCLK = 16 • fSAMPLE = 3.2MHz, unless otherwise noted.
PARAMETER
CONDITIONS
RESOLUTION
ANALOG INPUT
Full-Scale Input Span
Capacitance
Leakage Current
SYSTEM PERFORMANCE
No Missing Codes
Integral Linearity Error
Differential Linearity Error
Offset Error
Offset Error Match
Gain Error
Gain Error Match
Noise
Power Supply Rejection
SAMPLING DYNAMICS
Conversion Time
Acquisition Time
Throughput Rate
Multiplexer Settling Time
Aperture Delay
Aperture Jitter
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion(2)
Signal-to-(Noise + Distortion)
Spurious Free Dynamic Range
Channel-to-Channel Isolation
REFERENCE INPUT
Range
Resistance
Input Current
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels
VIH
VIL
VOH
VOL
Data Format
External Clock
POWER SUPPLY REQUIREMENTS
+VCC
Quiescent Current
Power Dissipation
TEMPERATURE RANGE
Specified Performance
VIN = 5Vp-p at 10kHz
VIN = 5Vp-p at 10kHz
VIN = 5Vp-p at 10kHz
VIN = 5Vp-p at 50kHz
DCLK Static
fSAMPLE = 12.5kHz
DCLK Static
| IIH | +5µA
| IIL | +5µA
IOH = –250µA
IOL = 250µA
Specified Performance
fSAMPLE = 12.5kHz
Power-Down Mode(3), CS = +VCC
ADS7842E
MIN
TYP
MAX
12
0 VREF
25
±1
12
±2
±0.8
±3
0.15
1.0
±4
0.1 1.0
30
70
12
3
200
500
30
100
–78 –72
68 71
72 79
120
0.1 +VCC
5
40 100
2.5
0.001
3
CMOS
3.0
–0.3
3.5
0.2
Straight Binary
5.5
+0.8
0.4
8
4.75
5.25
550 900
300
3
4.5
–40 +85
ADS7842EB
MIN
TYP
MAX
T
TT
T
T
T
±1
±0.5 ±1
T
TT
±3
TT
T
T
T
T
T
T
T
T
–80 –76
70 72
76 81
T
TT
T
TT
T
TT
T
TT
TT
T
T
T
TT
TT
TT
T
T
T
TT
UNITS
Bits
V
pF
µA
Bits
LSB(1)
LSB
LSB
LSB
LSB
LSB
µVrms
dB
Clk Cycles
Clk Cycles
kHz
ns
ns
ps
dB
dB
dB
dB
V
G
µA
µA
µA
V
V
V
V
MHz
V
µA
µA
µA
mW
°C
T Same specifications as ADS7842E.
NOTE: (1) LSB means Least Significant Bit. With VREF equal to +5.0V, one LSB is 1.22mV. (2) First five harmonics of the test frequency. (3) Power-down mode at
end of conversion when WR, CS, and BUSY conditions have all been met. Refer to Table III of this data sheet.
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.
®
ADS7842
2


Part Number ADS7842
Description 12-Bit/ 4-Channel Parallel Output Sampling ANALOG-TO-DIGITAL CONVERTER
Maker Burr-Brown Corporation
Total Page 13 Pages
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