SPT7734 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – 8-BIT, 40 MSPS,175 mW A/D CONVERTER

FEATURES
• Monolithic 40 MSPS Converter
• 175 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
SPT7734
8-BIT, 40 MSPS,175 mW A/D CONVERTER
APPLICATIONS
• All High-Speed Applications Where
Low Power Dissipation is Required
• Video Imaging
• Medical Imaging
• Radar Receivers
• IR Imaging
• Digital Communications
GENERAL DESCRIPTION
The SPT7734 is a 8-bit monolithic, low cost, ultralow power
analog-to-digital converter capable of minimum word rates
of 40 MSPS. The on-chip track-and-hold function assures
very good dynamic performance without the need for exter-
nal components. The input drive requirements are mini-
mized due to the SPT7734's low input capacitance of only
5 pF.
Power dissipation is extremely low at only 175 mW typical at
40 MSPS with a power supply of +5.0 V. The digital outputs
are +3 V or +5 V, and are user selectable. The SPT7734 has
incorporated proprietary circuit design and CMOS process-
ing technologies to achieve its advanced performance. In-
puts and outputs are TTL/CMOS compatible to interface with
TTL/CMOS logic systems. Output data format is straight
binary.
The SPT7734 is available in 28-lead SOIC and 32-lead small
(7 mm square) TQFP packages over the commercial tem-
perature range.
BLOCK DIAGRAM
1:16
A_IN
Mux
CLK In
Enable
Data
Vali
d
P1
P2
Timing ^...
and ^P15
Control
P16
Ref
In
ADC Section 1
T/H
Auto-
Zero
CMP
ADC Se_...ction 2
ADC Section 15
ADC Section 16
T/H
Auto-
Zero
CMP
9-Bit
SAR
9
DAC
...
9-Bit
SAR
9
DAC
Reference Ladder
VREF
9
9
...
9
9
9-Bit
16:1
Mux/
Error
Correction
D8 Overrange
D7 (MSB)
D6
D5
D4
D3
D2
D1
DØ (LSB)