SPT7725BIQ データシートの表示（PDF） - Signal Processing Technologies
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SPT7725BIQ Datasheet PDF : 12 Pages
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SPT7725
8-BIT, 300 MSPS FLASH A/D CONVERTER
FEATURES
• Metastable Errors Reduced to 1 LSB
• Low Input Capacitance: 10 pF
• Wide Input Bandwidth: 210 MHz
• 300 MSPS Conversion Rate
• Typical Power Dissipation: 2.2 Watts
APPLICATIONS
• Digital Oscilloscopes
• Transient Capture
• Radar, EW, ECM
• Direct RF Down-Conversion
• Medical Electronics: Ultrasound, CAT Instrumentation
GENERAL DESCRIPTION
The SPT7725 is a monolithic flash A/D converter capable of
digitizing a two volt analog input signal into 8-bit digital words
at a 300 MSPS (typ) update rate.
For most applications, no external sample-and-hold is re-
quired for accurate conversion due to the device's narrow
aperture time, wide bandwidth, and low input capacitance. A
single standard -5.2 volt power supply is required for opera-
tion of the SPT7725, with nominal power dissipation of 2.2 W.
A proprietary decoding scheme reduces metastable errors to
the 1 LSB level.
The part is packaged in a 42L ceramic sidebrazed DIP which
is pin compatible with the SPT7710. A 44L surface-mount
cerquad package and a 46L PGA package are also available
which allow access to additional reference ladder taps, an
overrange bit, and a data ready output. They are also pin-
compatible with the SPT7710. The SPT7725 is available in
industrial and military temperature ranges and in /883 compli-
ant versions.
BLOCK DIAGRAM
VRTS
VRTF
Analog Input
(Force or Sense)
AGND DGND
VEE
Preamp
Comparator
256
Clock
Buffer
255
VR3
152
LINV MINV
MSB D7
DRINV
DREAD
Overrange
151
D7 MSB
128
VR2
127
64
VR1
63
2
VRBF
VRBS
Convert CLK
CLK
1
2
Analog Input
(Sense or Force)
256 to
8-Bit
Encoder
D6
D5
D4
D3
D2
D1
LSB D0
ECL
Latches
and
Buffers
D6
D5
These functions are
D4
available in the PGA and
cerquad packages only.
D3
D2
D1
D0 LSB
VEE
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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