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PDF ADS574JP Data sheet ( Hoja de datos )
| Número de pieza | ADS574JP | |
| Descripción | Microprocessor-Compatible Sampling CMOS ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
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®
ADS574
ADS574
ADS574
ADS574
Microprocessor-Compatible Sampling
CMOS ANALOG-TO-DIGITAL CONVERTER
FEATURES
q REPLACES ADC574 FOR NEW DESIGNS
q COMPLETE SAMPLING A/D WITH
REFERENCE, CLOCK AND
MICROPROCESSOR INTERFACE
q FAST ACQUISITION AND CONVERSION:
25µs max
q ELIMINATES EXTERNAL SAMPLE/HOLD
IN MOST APPLICATIONS
q GUARANTEED AC AND DC PERFORMANCE
q SINGLE +5V SUPPLY OPERATION
q LOW POWER: 100mW max
q PACKAGE OPTIONS: 0.6" and 0.3" DIPs,
SOIC
DESCRIPTION
The ADS574 is a 12-bit successive approximation
analog-to-digital converter using an innovative
capacitor array (CDAC) implemented in low-power
CMOS technology. This is a drop-in replacement for
ADC574 models in most applications, with internal
sampling, much lower power consumption, and capa-
bility to operate from a single +5V supply.
The ADS574 is complete with internal clock, micro-
processor interface, three-state outputs, and internal
scaling resistors for input ranges of 0V to +10V, 0V to
+20V, ±5V, or ±10V. The maximum throughput time
for 12-bit conversions is 25µs over the full operating
temperature range, including both acquisition and con-
version.
Complete user control over the internal sampling func-
tion facilitates elimination of external sample/hold
amplifiers in most existing designs.
The ADS574 requires +5V, with –12V or –15V op-
tional, depending on usage. No +15V supply is re-
quired. Available packages include 0.3" or 0.6" wide
28-pin plastic DIPs and 28-lead SOICs.
Control
Inputs
Bipolar Offset
20V Range
10V Range
2.5V Reference
Input
2.5V Reference
Output
CDAC
Control Logic
Clock
–
+
Comparator
Successive
Approximation
Register
2.5V
Reference
Status
Parallel
Data
Output
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
© 1991 Burr-Brown Corporation
PDS-1104F
Printed in U.S.A. July, 1993
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VDD = VEE = +5V; Bipolar ±10V Input Range; sampling frequency of 40kHz; unless otherwise specified. All plots use 4096 point FFTs.
0
–20
–40
–60
–80
–100
–120
0
FREQUENCY SPECTRUM (±10V, 2kHz Input)
S/(N + D) = 73.1dB
THD = –94.5dB
SNR = 73.1dB
5 10 15
Frequency (kHz)
20
SIGNAL/(NOISE + DISTORTION) vs
INPUT FREQUENCY AND AMBIENT TEMPERATURE
75
70
65
0.1
–55°C
+125°C
+25°C
1 10
Input Frequency (kHz)
100
FREQUENCY SPECTRUM (±10V, 19kHz Input)
0
S/(N + D) = 68.4dB
–20 THD = –75.9dB
SNR = 69.3dB
–40
–60
–80
–100
–120
0
5 10 15
Frequency (kHz)
20
SPURIOUS FREE DYNAMIC RANGE, SNR AND THD
vs INPUT FREQUENCY
100
90
80
70
60
0.1
1 10
Input Frequency (kHz)
100
0
–20
–40
–60
–80
–100
–120
0
FREQUENCY SPECTRUM (±1V, 19kHz Input)
S/(N + D) = 53.3dB
THD = –74.5dB
SNR = 53.3dB
5 10 15
Frequency (kHz)
20
POWER SUPPLY REJECTION
vs SUPPLY RIPPLE FREQUENCY
80
60
40
20
10
10
100 1k 10k 100k 1M
Supply Ripple Frequency (Hz)
10M
®
5 ADS574
5 Page 
systems (due to multiplexers, sample/holds, etc. in front of
the converter) does not affect the accuracy of the ADS574
conversion in the Emulation Mode.
In both modes, as soon as the conversion is completed the
internal sample/hold circuit immediately begins slewing to
track the input signal.
Basically, the Control Mode is provided to allow full use of
the internal sample/hold, eliminating the need for an exter-
nal sample/hold in most applications. As compared with
systems using separate sample/hold and A/D, the ADS574
in the Control Mode also eliminates the need for one of the
control signals, usually the convert command. The com-
mand that puts the internal sample/hold in the hold state also
initiates a conversion, reducing timing constraints in many
systems.
The Emulation Mode allows the ADS574 to be dropped into
almost all existing ADC574 sockets without changes to any
other existing system hardware or software. The input to the
ADS574 in the Emulation Mode does not need to be stable
before a convert command is received, so that multiplexers,
programmable gain amplifiers, etc., can be slewing quickly
any time before a convert command is given as long as the
analog input to the ADS574 is stable after the convert
command is received, as it needs to be in existing ADC574
systems for accurate operation. In fact, even in the Emula-
tion Mode, system throughput can be speeded up, since the
input to the ADS574 can start slewing before the end of a
conversion (after the acquisition time), which is not possible
with existing ADC574s.
INSTALLATION
LAYOUT PRECAUTIONS
Analog (pin 9) and digital (pin 15) commons are not con-
nected together internally in the ADS574, but should be
connected together as close to the unit as possible and to an
analog common ground plane beneath the converter on the
component side of the board. In addition, a wide conductor
pattern should run directly from pin 9 to the analog supply
common, and a separate wide conductor pattern from pin 15
to the digital supply common.
If the single-point system common cannot be established
directly at the converter, pin 9 and pin 15 should still be
connected together at the converter. A single wide conductor
pattern then connects these two pins to the system common.
In either case, the common return of the analog input signal
should be referenced to pin 9 of the ADC. This prevents any
voltage drops that might occur in the power supply common
returns from appearing in series with the input signal.
SYMBOL
tAQ + tC
tC
tAQ
tAP
tJ
PARAMETER
Throughput Time:
12-bit Conversions
8-bit Conversions
Conversion Time:
12-bit Conversions
8-bit Conversions
Acquisition Time
Aperture Delay
Aperture Uncertainty
S/H CONTROL MODE
(Pin 11 Connected to +5V)
MIN
TYP
MAX
22 25
16 18
18
12
4
20
0.3
TABLE VI. Conversion Timing, T to T .
MIN
MAX
ADC574 EMULATION MODE
(Pin 11 Connected to 0V to –15V)
MIN TYP
MAX
22
16
18
12
4
4000
30
25
18
UNITS
µs
µs
µs
µs
µs
ns
ns
R/C
S/H Control Mode
Pin 11 connected to +5V.
ADC574 Emulation Mode*
Pin 11 connected to VEE or ground.
Signal
Acquisition
tC
tAP
Conversion
tAQ
Signal
Acquisition
tAP
tC
Conversion
tAQ
Signal
Acquisition
Signal
Acquisition
*In the ADC574 Emulation Mode, a convert command triggers a delay that
allows the ADS574 enough time to acquire the input signal before converting.
FIGURE 9. Signal Acquisition and Conversion Timing.
®
11 ADS574
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADS574JP.PDF ] | |
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