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參數(shù)資料
| 型號(hào)： | MP8775AS |
| 廠商： | MICRO POWER SYSTEMS |
| 元件分類： | ADC |
| 英文描述： | CMOS 20 MSPS, 8-Bit, High Speed Analog-to-Digital Converter |
| 中文描述： | 8-BIT FLASH METHOD ADC, PARALLEL ACCESS, PDSO20 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 511K |
| 代理商： | MP8775AS |
MP8775
CMOS
Rev. 3.01
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
(510) 668-7017
E
1999
20 MSPS, 8-Bit, High Speed
Analog-to-Digital Converter
FEATURES
8-Bit Resolution
20 MHz Sampling Rate
DNL = +1/2 LSB, INL = +1 LSB (typ)
Internal S/H Function
Single Supply: 5 V
V
IN
DC Range: 0 V to V
DD
V
REF
DC Range: 1 V to V
DD
Low Power: 85 mW typ. (excluding reference)
Latch-Up Free
ESD Protection: 2000 V Minimum
Power Down Available: MP8776
3 V Version: MP87L75
Small 20 Pin SOIC Package
APPLICATIONS
Digital Color Copiers
Cellular Telephones
CCD’s Based Systems
Hardware Scanners
Video Capture Boards
March 1999-4
GENERAL DESCRIPTION
The MP8775 is an 8-bit Analog-to-Digital Converter in a
small 20 pin SOIC package.
advanced 5 V CMOS process, this part offers excellent
performance, low power consumption and latch-up free
operation.
Designed using an
Thisdeviceusesatwo-stepflasharchitecturetomaintain
low power consumption at high conversion rates. The
input circuitry of the MP8775 includes an on-chip S/H
function and allows the user to digitize analog input
signals between GND and V
DD
. Careful design and chip
layout have achieved a low analog input capacitance.
This reduces “kickback” and eases the requirements of
the buffer/amplifier used to drive the MP8775.
The designer can choose the internally generated
referencevoltagesbyconnectingV
RB
toV
RBS
andV
RT
to
V
RTS
, or provide external reference voltages to the V
RB
and V
RT
pins. The internal reference generates 0.6 V at
V
RB
and 2.6 V at V
RT
.
Providing external reference
voltages allows easy interface to any input signal range
between GND and V
DD
. This also allows the system to
adjust these voltages to cancel zero scale and full scale
errors, or to change the input range as needed.
The device operates from a single +5 V supply. Power
consumption is 85 mW at F
s
= 20 MHz.
Specified for operation over the commercial / industrial
(--40 to +85
°
C) temperature range,
available in Surface Mount (SOIC), Shrunk Small Outline
(SSOP) and Plastic dual-in-line (PDIP) packages.
the MP8775 is
SIMPLIFIED BLOCK AND TIMING DIAGRAM
MSB
Comp.
LSB
Comp.
Latch
Latch
Encoder
+
Error
Correction
F/F
S/H
Clock Logic
AGND
DB7 (MSB)
DB0 (LSB)
CLK
V
RBS
V
RB
V
RT
V
RTS
V
DD
DV
DD
DGND
GND
AV
DD
V
IN
N
N-3
N-2
N-1
N
CLK
DB7-
DB0
Sample
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|---|---|
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