SPT7850(1998) Ver la hoja de datos (PDF) - Signal Processing Technologies
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SPT7850 Datasheet PDF : 12 Pages
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SPT7850
10-BIT, 20 MSPS, 140 mW A/D CONVERTER
FEATURES
• Monolithic 20 MSPS Converter
• 140 mW Power Dissipation
• On-Chip Track-and-Hold
• Single +5 V Power Supply
• TTL/CMOS Outputs
• 5 pF Input Capacitance
• Low Cost
• Tri-State Output Buffers
• High ESD Protection: 3,500 V Minimum
• Selectable +3 V or +5 V Logic I/O
APPLICATIONS
• All High-Speed Applications Where
Low Power Dissipation is Required
• Video Imaging
• Medical Imaging
• IR Imaging
• Scanners
• Digital Communications
GENERAL DESCRIPTION
The SPT7850 is a 10-bit monolithic, low cost, ultra-low power
analog-to-digital converter capable of minimum word rates of
20 MSPS. The on-chip track-and-hold function assures very
good dynamic performance without the need for external
components. The input drive requirements are minimized
due to the SPT7850's low input capacitance of only 5 pF.
Power dissipation is extremely low at only 140 mW typical
(165 mW maximum) at 20 MSPS with a power supply of
+5.0 V. The digital outputs are +3 V or +5 V, and are user
selectable. The SPT7850 is pin-compatible with the entire
BLOCK DIAGRAM
family of SPT 10-bit, CMOS converters (SPT7835/40/50/55/
60/61) which simplifies upgrades.
The SPT7850 has incorporated proprietary circuit design
and CMOS processing technologies to achieve its advanced
performance. Inputs and outputs are TTL/CMOS-compat-
ible to interface with TTL/CMOS-logic systems. Output data
format is straight binary.
The SPT7850 is available in 28-lead 300 mil cerdip and PDIP,
28-lead SOIC and 32-lead small (7 mm square) TQFP
packages over the temperature range. For availability of
extended temperature ranges and /883 processing require-
ments, consult the factory.
1:8
AIN
Mux
CLK In
Enable
Data
Valid
P1
P2
Timing ...
and P7
Control
P8
Ref
In
ADC Section 1
T/H
Auto-
Zero
CMP
ADC Se...ction 2
ADC Section 7
ADC Section 8
T/H
Auto-
Zero
CMP
11-Bit
SAR
11
DAC
...
11-Bit
SAR
11
DAC
Reference Ladder
VRef
11
11
... 11
11
11-Bit
8:1
Mux/
Error
Correction
D10 Overrange
D9 (MSB)
D8
D7
D6
D5
D4
D3
D2
D1
DØ (LSB)
Signal Processing Technologies, Inc.
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: (719) 528-2300 FAX: (719) 528-2370
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