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PDF ADS7841EB Data sheet ( Hoja de datos )
| Número de pieza | ADS7841EB | |
| Descripción | 12-Bit/ 4-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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®
ADS7841
ADS7841
ADS7841
12-Bit, 4-Channel Serial Output Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q SINGLE SUPPLY: 2.7V to 5V
q 4-CHANNEL SINGLE-ENDED OR
2-CHANNEL DIFFERENTIAL INPUT
q UP TO 200kHz CONVERSION RATE
q ±1 LSB MAX INL AND DNL
q GUARANTEED NO MISSING CODES
q 72dB SINAD
q SERIAL INTERFACE
q 16-PIN PDIP OR 16-LEAD SSOP PACKAGE
q ALTERNATE SOURCE FOR MAX1247
APPLICATIONS
q DATA ACQUISITION
q TEST AND MEASUREMENT
q INDUSTRIAL PROCESS CONTROL
q PERSONAL DIGITAL ASSISTANTS
q BATTERY-POWERED SYSTEMS
DESCRIPTION
The ADS7841 is a 4-channel, 12-bit sampling analog-
to-digital converter (ADC) with a synchronous serial
interface. The resolution is programmable to either 8
or 12 bits. Typical power dissipation is 2mW at a
200kHz throughput rate and a +5V supply. The refer-
ence voltage (VREF) can be varied between 100mV and
VCC, providing a corresponding input voltage range of
0V to VREF. The device includes a shutdown mode
which reduces power dissipation to under 15µW. The
ADS7841 is guaranteed down to 2.7V operation.
Low power, high speed, and on-board multiplexer
make the ADS7841 ideal for battery operated systems
such as personal digital assistants, portable multi-
channel data loggers, and measurement equipment.
The serial interface also provides low-cost isolation
for remote data acquisition. The ADS7841 is available
in a 16-pin PDIP or a 16-lead SSOP package and is
guaranteed over the –40°C to +85°C temperature range.
CH0
CH1
CH2
CH3
COM
VREF
Four
Channel
Multiplexer
SAR
CDAC
Comparator
Serial
Interface
and
Control
DCLK
CS
SHDN
DIN
DOUT
MODE
BUSY
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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1998 Burr-Brown Corporation
PDS-1420B
Printed in U.S.A. June, 1998
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 ADS7841
5 Page 
CS
DCLK
DIN
BUSY
tACQ
1 81
S A2
(START)
A1
A0
MODE
SGL/
DIF
PD1 PD0
Idle Acquire
81
Conversion
8
Idle
DOUT
11 10 9 8 7 6 5
(MSB)
4
3210
Zero Filled...
(LSB)
FIGURE 3. Conversion Timing, 24-Clocks per Conversion, 8-Bit Bus Interface. No DCLK delay required with dedicated
serial port.
CS
DCLK
DIN
BUSY
DOUT
18
S
CONTROL BITS
1
81
8
S
CONTROL BITS
1
11 10 9 8 7 6 5
43 2 1 0
11 10 9
FIGURE 4. Conversion Timing, 16-Clocks per Conversion, 8-bit Bus Interface. No DCLK delay required with dedicated
serial port.
CS
DCLK
DIN
BUSY
DOUT
tCSS
tCH
tDS
tBDV
tDV
tCL tBD
tDH
PD0
tBD
tD0
11 10
FIGURE 5. Detailed Timing Diagram.
tCSH
tBTR
tTR
11 ADS7841
®
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ADS7841EB.PDF ] | |
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