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參數(shù)資料
| 型號(hào)： | SPT7938SIR |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | SSOP-28 |
| 文件頁(yè)數(shù)： | 1/10頁(yè) |
| 文件大?。?/td> | 97K |
| 代理商： | SPT7938SIR |
SPT7938
12-BIT, 40 MSPS, 170 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 SPT7938 is a 12-bit monolithic, low-cost, low-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 SPT7938’s low input capacitance of only
20 pF.
Power dissipation is extremely low at only 170 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 SPT7938 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 SPT7938 is available in a 28-lead SSOP package over
the industrial temperature range.
BLOCK DIAGRAM
FEATURES
Monolithic 40 MSPS Analog-to-Digital Converter
170 mW Power Dissipation
On-Chip Track-and-Hold
Single +5 V Power Supply
TTL/CMOS Outputs
20 pF Input Capacitance
Selectable +3 V or +5 V Logic I/O
AIN
CLK In
13-Bit
SAR
DAC
ADC Section 1
T/H
13
13-Bit
SAR
DAC
ADC Section 18
Auto-
Zero
CMP
Auto-
Zero
CMP
T/H
13
1:18
Mux
13
13-Bit
18:1
Mux/
Error
Correction
Timing
and
Control
P1
P2
P17
P18
ADC Section 2
ADC Section 17
Reference Ladder
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D (LSB)
D11 (MSB)
D12 Out of Range
VRLS
VRHF
VRLF
VRHS
EN
.
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