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PDF ADS7842E Data sheet ( Hoja de datos )
| Número de pieza | ADS7842E | |
| Descripción | 12-Bit/ 4-Channel Parallel Output Sampling ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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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
1 page  
TYPICAL PERFORMANCE CURVES: +5V
At TA = +25°C, +VCC = +5V, VREF = +5V, fSAMPLE = 200kHz, and fCLK = 16 • fSAMPLE = 3.2MHz, unless otherwise noted.
0
–20
–40
–60
–80
–100
–120
0
FREQUENCY SPECTRUM
(4096 Point FFT; fIN = 1,123Hz, –0.2dB)
25 50 75
Frequency (kHz)
100
0
–20
–40
–60
–80
–100
–120
0
FREQUENCY SPECTRUM
(4096 Point FFT; fIN = 10.3kHz, –0.2dB)
25 50 75
Frequency (kHz)
100
SIGNAL-TO-NOISE RATIO AND SIGNAL-TO-
(NOISE+DISTORTION) vs INPUT FREQUENCY
74
SNR
73
72
SINAD
71
70
69
68
1
10
Input Frequency (kHz)
100
SPURIOUS FREE DYNAMIC RANGE AND TOTAL
HARMONIC DISTORTION vs INPUT FREQUENCY
85 –85
SFDR
80 –80
THD
75 –75
70 –70
65
1
10
Input Frequency (kHz)
–65
100
12.0
11.8
11.6
11.4
11.2
11.0
1
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
10
Input Frequency (kHz)
100
CHANGE IN SIGNAL-TO-(NOISE+DISTORTION)
vs TEMPERATURE
0.6
0.4
0.2
0.0
–0.2
–0.4
fIN = 10kHz, –0.2dB
–0.6
–40
–20
0
20 40
Temperature (°C)
60
80 100
®
5 ADS7842
5 Page 
CS RD
0
0
WR BUSY A0
X11
X10
A1 COMMENTS
X Power Down Mode
X Wake Up Mode
means rising edge triggered. X = Don't care.
TABLE III. Truth Table for Power Down and Wake Up
Modes.
DESCRIPTION
ANALOG INPUT
Least Significant Bit (LSB)
Full Scale
Midscale
Midscale –1LSB
Zero Full Scale
1.2207mV
4.99878V
2.5V
2.49878V
0V
DIGITAL OUTPUT
STRAIGHT BINARY
BINARY CODE HEX CODE
1111 1111 1111
1000 0000 0000
0111 1111 1111
0000 0000 0000
FFF
800
7FF
000
Table IV. Ideal Input Voltages and Output Codes (VREF = 5V).
CS
Latching in Address for Next Channel
WR
Conversion
Sample
CLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
BUSY
RD
A0
A1
DB0-DB11
FIGURE 2. Normal Operation, 16 Clocks per Conversion.
DATA VALID
CS
WR
CLK
BUSY
A0, A1
t1 t3
t6 t8 t7
t4
tCKL
t5
t2
t10 t9
N + 1(1)
NOTE: (1) Addresses for next conversion (N + 1) latched in with rising edge of current WR (N).
FIGURE 3. Initiating a Conversion.
11 ADS7842
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11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADS7842E.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ADS7842 | 12-Bit/ 4-Channel Parallel Output Sampling ANALOG-TO-DIGITAL CONVERTER | Burr-Brown Corporation |
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