SPT1175
8-BIT, 20 MSPS CMOS A/D CONVERTER
Signal Processing Technologies, Inc.
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300
FAX: (719) 528-2370
FEATURES
• 20 MSPS Maximum Conversion Rate
• Internal Sample-and-Hold Function
• 90 mW Power Dissipation
• Internal Voltage Reference
• Single +5.0 V Power Supply
• Three-State TTL-Outputs
• CMOS Compatible Clock
APPLICATIONS
• Video Digitizing
• Image Scanners
• Personal Computer Video
• Medical Ultrasound
• Multimedia
• Digital Television
Data
Latches
and
3-State
Output
Buffer
Error
Correction
Circuit
Latch
Coarse
Sampling
Amplifier
Reference Matrix
Timing
Generator
Latch
Analog
Mux
Fine
Sampling
Amplifier
Fine
Sampling
Amplifier
Encoder
Encoder
DGND
DVDD
VRBS
VRB
VIN
VRT
VRTS
AGND
AVD
DVDD
AGND
DØ (LSB)
D1
D2
D3
D4
D5
D6
D7 (MSB)
CLK
OE
GENERAL DESCRIPTION
The SPT1175 is a CMOS two-step A/D converter capable of
digitizing full scale analog input signals into 8-bit digital words
at a sample rate of 20 MSPS.
For most applications, no external sample-and-hold or
video driving amplifiers are required due to the device's
narrow aperture time, wide bandwidth, and low input ca-
pacitance.
The SPT1175 operates from a single +5.0 V power supply
and has an internal voltage reference which eliminates the
need for external reference circuitry. All digital inputs are
CMOS compatible and the tri-state outputs are TTL-compat-
ible. The SPT1175 is ideal for most video and image pro-
cessing applications that require low power dissipation and
low cost. The SPT1175 is available in 24-lead plastic SOIC,
plastic DIP, and PLCC packages over the commercial tem-
perature range (0 to +70
°C). It is also available in die form.
BLOCK DIAGRAM
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