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SPT7855SIT Datasheet

  • SPT7855SIT

  • 10-BIT, 25 MSPS, 135 mW A/D CONVERTER

  • 11頁

  • FAIRCHILD

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SPT7855
10-BIT, 25 MSPS, 135 mW A/D CONVERTER
TECHNICAL DATA
MAY 25, 2001
FEATURES
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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
APPLICATIONS
鈥?All high-speed applications where low power
dissipation is required
鈥?Video imaging
鈥?Medical imaging
鈥?IR imaging
鈥?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鈥檚 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
SPT7855 is pin-compatible with an entire family of 10-bit,
CMOS converters (SPT7835/40/50/55/60/61), which sim-
plifies upgrades. The SPT7855 has incorporated propri-
etary 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
BLOCK DIAGRAM
ADC Section 1
A
IN
1:16
Mux
T/H
Auto-
Zero
CMP
11-Bit
SAR
11
11
D10 Overrange
D9 (MSB)
D8
D7
D6
D5
D4
D3
D2
D1
P1
DAC
CLK In
Timing
and
Control
Enable
.
.
.
P15
P2
P16
.
.
.
ADC Section 15
ADC Section 2
ADC Section 16
T/H
Auto-
Zero
CMP
.
.
.
11-Bit
SAR
11
DAC
11
.
.
.
11
11
11-Bit
16:1
Mux/
Error
Correction
Data
Valid
Ref
In
Reference Ladder
V
REF
D0 (LSB)

SPT7855SIT 產品屬性

  • Fairchild Semiconductor

  • 視頻模擬/數字化轉換器集成電路

  • Single Ended

  • Hexadecimal

  • 1

  • 25000 KSPs

  • 10 bit

  • SAR

  • 4 V

  • Parallel

  • 57 dB

  • External

  • 5.25 V

  • 4.75 V

  • 175 mW

  • + 85 C

  • - 40 C

  • TQFP-32

  • SMD/SMT

  • 135 mW

  • Yes

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