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PDF SPT774 Data sheet ( Hoja de datos )
| Número de pieza | SPT774 | |
| Descripción | FAST / COMPLETE 12-BIT UP COMPATIBLE A/D CONVERTER WITH SAMPLE/HOLD | |
| Fabricantes | SPT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SPT774 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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SPT774
FAST, COMPLETE 12-BIT µP COMPATIBLE
A/D CONVERTER WITH SAMPLE/HOLD
FEATURES
• Improved Higher Performance Version of the HADC574Z
• Complete 12-Bit A/D Converter with Sample/Hold,
Reference and Clock
• Low Power Dissipation (120 mW Max)
• 12-Bit Linearity (Over Temp)
• 8 µs Max Conversion Time
• Single +5 V Supply
• Full Bipolar and Unipolar Input Range
APPLICATIONS
• Data Acquisition Systems
• 8 or 12-Bit µP Input Functions
• Process Control Systems
• Test and Scientific Instruments
• Personal Computer Interface
GENERAL DESCRIPTION
The SPT774 is a complete, 12-bit successive approximation
A/D converter manufactured in CMOS technology. The de-
vice is an improved version of the HADC574Z. Included on
chip are an internal reference, clock, and a sample-and-hold.
The S/H is an additional feature not available on similar
devices.
The SPT774 features 8 µs (max) conversion time of 10 or
20 V input signals. Also, a three-state output buffer is added
for direct interface to an 8-, 12- or 16-bit µP bus.
The SPT774 has standard bipolar and unipolar input ranges
of 10 V and 20 V that are controlled by a bipolar offset pin and
laser trimmed for specified linearity, gain and offset accuracy.
The power supply is +5 V. The device also has an optional
mode control voltage which may be used depending on the
application. With a maximum dissipation of 120 mW at the
specified voltages, power consumption is about five times
lower than that of currently available devices.
The SPT774 is available in 28-lead ceramic sidebrazed DIP,
PDIP and SOIC packages in the commercial temperature
range.
BLOCK DIAGRAM
Output
Nibble A
Nibble B
Three-State Buffers And Control
Nibble C
STS
12-Bit SAR
Clock
+
Comp
-
Control Logic
Ref
12/8 CS Ao R/C CE
Ref Out
12-Bit
Capacitance
DAC
Offset/Gain
Trim
20 V In
10 V In
BIP Off
AGND
Signal Processing Technologies, Inc.
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370 Website: http://www.spt.com E-Mail: [email protected]
1 page  
ELECTRICAL SPECIFICATIONS
TA = TMIN to TMAX, VEE = 0 to +5 V, VDD = +5 V, fS = 117 kHz, fIN = 10 kHz, unless otherwise specified.
PARAMETER
TEST
CONDITIONS
TEST
LEVEL
SPT774C
MIN TYP MAX
AC ELECTRICAL CHARACTERISTICS4
Stand-Alone Mode Timing
tHRL Low R/C Pulse Width
tDS STS Delay from R/C
tHDR Data Valid After R/C Low
tHS STS Delay After Data Valid
tHRH High R/C Pulse Width
tDDR Data Access Time
Sample-and-Hold
Aperture Delay
Aperture Uncertainty Time
VEE = +5 V
VEE = +5 V
VI 25
VI 200
VI 25
VI 75 150 375
VI 100
VI 150
IV 20
V 300
SPT774B
MIN TYP MAX UNITS
25 ns
200 ns
25 ns
75 150 375 ns
100 ns
150 ns
20 ns
300 ps, RMS
TEST LEVEL CODES
TEST LEVEL
All electrical characteristics are subject to the
following conditions:
All parameters having min/max specifications
are guaranteed. The Test Level column indi-
cates the specific device testing actually per-
formed during production and Quality Assur-
ance inspection. Any blank section in the data
column indicates that the specification is not
tested at the specified condition.
I
II
III
IV
V
VI
TEST PROCEDURE
100% production tested at the specified temperature.
100% production tested at TA=25 °C, and sample
tested at the specified temperatures.
QA sample tested only at the specified temperatures.
Parameter is guaranteed (but not tested) by design
and characterization data.
Parameter is a typical value for information purposes
only.
100% production tested at TA = 25 °C. Parameter is
guaranteed over specified temperature range.
Figure 3 - Low Pulse for R/C - Outputs Enabled
After Conversion
t HRL
R/C
t DS
STS
t HDR
tC
t HS
DB11-DB0 DATA VALID
DATA VALID
Figure 4 - High Pulse for R/C - Outputs Enabled While
R/C is High, Otherwise High Impedance
R/C
t HRH
t DS
STS
t DDR
t HDR
HIGH-Z
DB11-DB0
DATA VALID
tC
HIGH-Z
SPT
5
SPT774
8/1/00
5 Page 
28
1
A
B
G
C
PACKAGE OUTLINES
28-Lead Sidebrazed
H
J
E
F
D
INCHES
MILLIMETERS
SYMBOL MIN MAX MIN MAX
A
0.077
0.093
1.96
2.36
I
B
0.016
0.020
0.41
0.51
C
0.095
0.105
2.41
2.67
D
.050 typ
1.27 typ
E
0.040
0.060
1.02
1.52
F
0.215
0.235
5.46
5.97
G
1.388
1.412
35.26
35.86
H
0.585
0.605
14.86
15.37
I
0.009
0.012
0.23
0.30
J
0.600
0.620
15.24
15.75
28
1
B
C
A
D
28-Lead SOIC
IH
F
E
H
SYMBOL
A
B
C
D
E
F
G
H
I
INCHES
MIN MAX
0.696
0.712
0.004
0.012
.050 typ
0.014
0.019
0.009
0.012
0.080
0.104
0.016
0.050
0.394
0.419
0.291
0.299
MILLIMETERS
MIN MAX
17.68
18.08
0.10 0.30
1.27 typ
0.36 0.48
0.23 0.30
2.03 2.64
0.41 1.27
10.01
10.64
7.39 7.59
G
SPT
11
SPT774
8/1/00
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SPT774.PDF ] | |
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