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PDF HS574AU Data sheet ( Hoja de datos )
| Número de pieza | HS574AU | |
| Descripción | 12-Bit Sampling A/D Converters | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HS574AU (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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HS574A/SP674A
12–Bit Sampling A/D Converters
s Complete12–bitA/DConverterswithSample–
Hold, Reference, Clock and Tri–state Outputs
s Low Power Dissipation — 110mW Maximum
s 12–Bit Linearity Over Temperature
s Fast Conversion time:
25µs Max (HS574A)
15µs Max (SP674A)
s Monolithic Construction
DESCRIPTION…
The HS574A/SP674A Series are complete 12–bit successive–approximation A/D converters
integrated on a single die with tri-state output latches, an internal reference, clock and a sample–
hold. They feature 12–bit linearity over temperature, low power dissipation and fast conversion
time. They are available in commercial and military temperature ranges.
STS DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 DGND
28 27 26 25 24 23 22 21 20 19 18 17 16 15
NIBBLE A
NIBBLE B
THREE–STATE BUFFERS AND CONTROL
NIBBLE C
12–BIT SAR
OSC
COMP
12–BIT
CAPACITANCE
DAC
CONTROL LOGIC
REF
OFFSET/GAIN
TRIM
7.5K 15K
7.5K 15K
N/C 7.5K
1 2 3 4 5 6 7 8 9 10 11 12 13 14
VLOGIC 12/8 CS
A0 R/C CE VCC REF AGND REF VEE BIP 10V 20V
OUT
IN
OFF IN
IN
3
1 page  
FEATURES…
The HS574A/SP674A feature standard bipolar
and unipolar input ranges of 10V and 20V. Input
ranges are controlled by a bipolar offset pin and
laser-trimmed for specified linearity, gain and
offset accuracy. Power requirements are +5V
and +12V to +15V with a maximum dissipation
of 150mW at the specified voltages. Conversion
times of 8µs, 10µs, 15µs and 25µs are available,
as are units with 10, 25 or 50ppm/°C temperature
coefficients for flexible matching to specific
application requirements.
The HS574A/SP674A are available in six prod-
uct grades for each conversion time. The –J, –K
and –L models are specified over 0˚C to + 70˚C
commercial temperature range; the –S, –T and –
U models are specified over the –55˚C to +125˚C
military temperature range. Processing in accor-
dance with MIL–STD–883C is also available.
The HS574A/SP674A are packaged in a 28–pin
CerDIP. Please consult the factory for other
packaging options.
CIRCUIT OPERATION…
The HS574A/SP674A are complete 12–bit ana-
log-to-digital converters with integral voltage
reference, comparator, successive–approxima-
tion register (SAR), sample–and–hold, clock,
output buffers and control circuitry. The high
level of integration of the HS574A/SP674A
means they require few external components.
When the control section of theHS574A/SP674A
initiates a conversion command, the clock is
enabled and the successive–approximation reg-
ister is reset to all zeros. Once the conversion
cycle begins, it can not be stopped or re–started
and data is not available from the output buffers.
The SAR, timed by the clock, sequences through
the conversion cycle and returns an end–of–
convert flag to the control section of the ADC.
The clock is then disabled by the control section,
the output status goes low, and the control sec-
tion is enabled to allow the data to be read by
external command.
The internal HS574A/SP674A 12–bit CDAC is
sequenced by the SAR starting from the MSB to
the LSB at the beginning of the conversion cycle
to provide an output voltage from the CDAC that
is equal to the input signal voltage (which is
divided by the input voltage divider network).
The comparator determines whether the addition
of each successively–weighted bit voltage causes
the CDAC output voltage summation to be greater
or less than the input voltage; if the sum is less,
the bit is left on; if more, the bit is turned off.
After testing all the bits, the SAR contains a 12–
bit binary code which accurately represents the
input signal to within ±1⁄2 LSB.
The internal reference provides the voltage refer-
ence to the CDAC with excellent stability over
temperature and time. The reference is trimmed
to 10.00 Volts ±1% and can supply up to 2mA to
an external load in addition to that required to
drive the reference input resistor (1mA) and
offset resistor (1mA) when operating with ±15V
supplies. If the HS574A/SP674A is used with
±12V supplies, or if external current must be
supplied over the full temperature range, an
external buffer amplifier is recommended. Any
external load on the HS574A/SP674A reference
must remain constant during conversion.
The sample and hold is a default function by
virtue of the CDAC architecture. Therefore the
majority of the S/H specifications are included
within the A/D specifications.
Sample–and–Hold Function
Although there is no sample-and-hold circuit in
the classical sense, the sampling nature of the
capacitive DAC makes the HS574A/SP674A
appear to have a built in sample and hold. This
sample and hold action substantially increases
the usefulness of the HS574A/SP674A over that
of similar competing devices.
Note that even though the user may use an
external sample and hold for very high fre-
quency inputs, the internal sample and hold still
provides a very useful isolation function. Once
the internal sample is taken by the CDAC capaci-
tance, the input of the HS574A/SP674A is dis-
connected from the input. This prevents tran-
sients occurring during conversion from being
inflicted upon the attached buffer. All other 574/
674 circuits will cause a transient load current on
7
5 Page 
CONVERT MODE TIMING
CE
tSSC
CS
R/C tSRC
A0
tSAC
STS
DB11–
DB0
tHEC
tHRC
tHAC
tDSC
tC
HIGH IMPEDANCE
CHARACTERISTICS
Typical @ 25˚C, VCC = +15V or +10V, VLOGIC = +5V, VEE = 0V, unless otherwise specified.
PARAMETER
tDSC STS Delay from CE
tHEC CE Pulse Width
tSSC CS to CE Setup
tHSC CS Low during CE High
tSRC R/C to CE Setup
tHRC R/C Low during CE High
tSAC A0 to CE Setup
tHAC A0 Valid during CE High
tC Conversion Time1, 3, 4
MIN. TYP. MAX.
200
50
50
50
50
50
0
50
See specifications
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
CONDITIONS
NOTES:
1.
2.
3.
4.
Parameters guaranteed by design and sample tested.
Parameters 100% tested @ 25˚C on special orders.
100% tested.
TMIN to TMAX.
Figure 8. Convert Mode Timing
13
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet HS574AU.PDF ] | |
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