SPT7855SIS 데이터 시트보기 (PDF) - Signal Processing Technologies
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SPT7855SIS Datasheet PDF : 11 Pages
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FEATURES
• Monolithic 25 MSPS converter
• 135 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
SPT7855
10-BIT, 25 MSPS, 135 mW A/D CONVERTER
TECHNICAL DATA
MAY 25, 2001
APPLICATIONS
• All high-speed applications where low power
dissipation is required
• Video imaging
• Medical imaging
• IR imaging
• Digital communications
GENERAL DESCRIPTION
The SPT7855 is a 10-bit monolithic, low-cost, ultralow-
power analog-to-digital converter capable of minimum
word rates of 25 MSPS. The on-chip track-and-hold func-
tion assures very good dynamic performance without the
need for external components. The input drive require-
ments are minimized due to the SPT7855’s low input
capacitance of only 5 pF.
Power dissipation is extremely low at only 135 mW typical
at 25 MSPS with a power supply of +5.0 V. The digital out-
puts are +3 V or +5 V, and are user selectable. The
BLOCK DIAGRAM
AIN
1:16
Mux
ADC Section 1
T/H
Auto-
Zero
CMP
CLK In
Enable
Data
Valid
P1
...P2
Timing
and P15
Control
P16
... ADC Section 2
ADC Section 15
ADC Section 16
T/H
Auto-
Zero
CMP
SPT7855 is pin-compatible with the entire family of SPT
10-bit, CMOS converters (SPT7835/40/50/55/60/61),
which simplifies upgrades. The SPT7855 has incorpo-
rated proprietary circuit design* and CMOS processing
technologies to achieve its advanced performance. Inputs
and outputs are TTL/CMOS-compatible to interface with
TTL/CMOS logic systems. Output data format is straight
binary.
The SPT7855 is available in 28-lead SOIC and 32-lead
small (7 mm square) TQFP packages over the commer-
cial and industrial temperature ranges.
*Patent pending
11-Bit
11
SAR
11
DAC
D10 Overrange
D9 (MSB)
D8
D7
...
... 11
11
11-Bit
16:1
D6
Mux/
D5
Error
Correction
11
D4
11-Bit
SAR
D3
11
DAC
D2
D1
Ref
In
Reference Ladder
VREF
D0 (LSB)
Signal Processing Technologies, Inc.
4755 Forge Road, Colorado Springs, Colorado 80907, USA
Phone: 719-528-2300 Fax: 719-528-2370 Web Site: http://www.spt.com e-mail: sales@spt.com
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