SPT7862 データシートの表示（PDF） - Cadeka Microcircuits LLC.
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SPT7862 Datasheet PDF : 10 Pages
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SPT7862
10-BIT, 40 MSPS, DUAL-CHANNEL A/D CONVERTER
FEATURES
• Dual-channel, 10-Bit, 40 MSPS analog-to-digital
converter
• Low power dissipation: 320 mW (typical)
• Internal track-and-hold
• Single +5 volt supply
• Tri-state, TTL/CMOS-compatible outputs
• Selectable +3 or +5 V logic I/O
• High ESD protection of 3,500 volts minimum
APPLICATIONS
• Video set-top boxes
• Cellular base stations
• QPSK/QAM RF demodulation
• S-video digitizers
• Composite video digitizers
• Portable and handheld instrumentation
• Medical ultrasound
• Cable modems
• Video frame grabbers
GENERAL DESCRIPTION
The SPT7862 contains two separate 10-bit CMOS analog-
to-digital converters that have sampling rates of up to 40
MSPS. Each device has its own separate clock and refer-
ence inputs so that they can be used independently in
multichannel applications or can be driven from the same
inputs for demanding quadrature demodulation and S-video
applications. On-chip track-and-hold and advanced propri-
etary circuit design in a CMOS process technology provide
very good dynamic performance.
The SPT7862 operates from a single +5 V supply. Digital
data outputs are user selectable at +3 or +5 V. Output data
format is straight binary.
The SPT7862 is available in a 64-lead TQFP package
(10 x 10 mm) over the industrial temperature range of
–40 °C to +85 °C.
BLOCK DIAGRAM
AVDD AGND DVDD DGND
VINA
VINRA
VRHFA
VRHSA
VRLFA
VRLSA
CLK A
VINB
VINRB
VRHFB
VRHSB
VRLFB
VRLSB
CLK B
ADC
Reference
Ladder
Timing
Generation
ADC
Reference
Ladder
Timing
Generation
Output
Buffers
Output
Buffers
OVDDA (+3.3/5.0 V)
DA9–0
OGNDA
DAVA
EN
OVDDB (+3.3/5.0 V)
DB9–0
OGNDB
DAVB
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