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SPT774BCJ Datasheet

  • SPT774BCJ

  • FAST, COMPLETE 12-BIT UP COMPATIBLE A/D CONVERTER WITH SAMPL...

  • 12頁

  • ETC

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SPT774
FAST, COMPLETE 12-BIT
碌
P COMPATIBLE
A/D CONVERTER WITH SAMPLE/HOLD
FEATURES
鈥?Improved Higher Performance Version of the HADC574Z
鈥?Complete 12-Bit A/D Converter with Sample/Hold,
Reference and Clock
鈥?Low Power Dissipation (120 mW Max)
鈥?12-Bit Linearity (Over Temp)
鈥?8
碌s
Max Conversion Time
鈥?Single +5 V Supply
鈥?Full Bipolar and Unipolar Input Range
APPLICATIONS
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Data Acquisition Systems
8 or 12-Bit
碌P
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
碌s
(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
碌P
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
Nibble A
Output
Nibble B
Three-State Buffers And Control
Nibble C
STS
12-Bit SAR
+
Comp
Clock
12-Bit
Capacitance
DAC
-
Offset/Gain
Trim
Control Logic
Ref
20 V In
10 V In
BIP Off
12/8
CS
Ao
R/C
CE
Ref Out
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: sales@spt.com

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