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부품번호 | WM8191 기능 |
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기능 | 14-bit 6MSPS CIS/CCD Analogue Front End/Digitiser | ||
제조업체 | Wolfson Microelectronics plc | ||
로고 | |||
WM8191
14-bit 6MSPS CIS/CCD Analogue Front End/Digitiser
Advanced Information, April 2001, Rev 3.1
DESCRIPTION
The WM8191 is a 14-bit analogue front end/digitiser IC
which processes and digitises the analogue output signals
from CCD sensors or Contact Image Sensors (CIS) at pixel
sample rates of up to 6MSPS.
The device includes three analogue signal processing
channels each of which contains Reset Level Clamping,
Correlated Double Sampling and Programmable Gain and
Offset adjust functions. Three multiplexers allow single
channel processing. The output from each of these
channels is time multiplexed into a single high-speed 14-bit
analogue-to-digital converter. The digital output data is
available in 14-bit parallel or 8/7/4-bit wide multiplexed
format, with no missing codes.
An internal 4-bit DAC is supplied for internal reference level
generation. This may be used during CDS to reference CIS
signals or during Reset Level Clamping to clamp CCD
signals. Alternatively an external reference level may be
applied. ADC references are generated internally, ensuring
optimum performance from the device.
Using an analogue supply voltage of 5V and a digital
interface supply of either 5V or 3.3V, the WM8191 typically
only consumes 250mW when operating from a single 5V
supply and less than 1µA when in power down mode.
FEATURES
• 14-bit ADC
• No missing codes guaranteed
• 6MSPS conversion rate
• Low power – 250mW typical
• 5V single supply or 5V/3.3V dual supply operation
• Single or 3 channel operation
• Correlated double sampling
• Programmable gain (8-bit resolution)
• Programmable offset adjust (8-bit resolution)
• Programmable clamp voltage
• 14-bit parallel or 8/7/4-bit wide multiplexed data output
formats
• Internally generated voltage references
• 48-pin TQFP package
• Serial or parallel control interface
APPLICATIONS
• Flatbed and sheetfeed scanners
• USB compatible scanners
• Multi-function peripherals
• High-performance CCD sensor interface
BLOCK DIAGRAM
VRLC/VBIAS
(2)
VSMP MCLK
(15) (17)
AVDD1-2
(43, 44)
DVDD1-3
(10, 24, 35)
VRT VRX VRB
(48) (1) (47)
RINP (8)
GINP (6)
BINP (4)
CL
RLC
RLC
RLC
RLC 4
DAC
RS VS
M
U
X
TIMING CONTROL
CDS
RM
GU
X
B
8
OFFSET
DAC
+ PGA
RM
GU
X
B
8
VREF/BIAS
I/P SIGNAL
POLARITY
ADJUST
CDS
+ PGA
8 OFFSET
DAC
8 I/P SIGNAL
POLARITY
ADJUST
CDS
+ PGA
8 OFFSET
DAC
8 I/P SIGNAL
POLARITY
ADJUST
WM8191
+
M
+U
X
14-
BIT
ADC
DATA
I/O
PORT
+
CONFIGURABLE
SERIAL/
PARALLEL
CONTROL
INTERFACE
(11) OEB
(21) OP[0]
(22) OP[1]
(23) OP[2]
(26) OP[3]
(27) OP[4]
(28) OP[5]
(29) OP[6]
(31) OP[7]
(32) OP[8]
(33) OP[9]
(34) OP[10]
(37) OP[11]
(38) OP[12]
(39) OP[13]/SDO
(12) SEN/STB
(14) SCK/RNW
(13) SDI/DNA
(16) RLC/ACYC
(42) NRESET
(3, 5, 7, 9, 45, 46)
AGND1-6
(18, 25, 30, 36, 40)
DGND1-5
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: [email protected]
www.wolfsonmicro.com
Advanced Information data sheets contain
preliminary data on new products in the
preproduction phase of development.
Supplementary data will be published at a
later date.
2001 Wolfson Microelectronics Ltd.
WM8191
Advanced Information
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
CONDITION
MIN MAX
Analogue supply voltages: AVDD1, 2
GND - 0.3V
GND + 7V
Digital supply voltages: DVDD1 − 3
GND - 0.3V
GND + 7V
Digital grounds: DGND1 − 5
GND - 0.3V
GND + 0.3V
Analogue grounds: AGND1 − 6
GND - 0.3V
GND + 0.3V
Digital inputs, digital outputs and digital I/O pins
GND - 0.3V
DVDD2 + 0.3V
Analogue inputs (RINP, GINP, BINP)
GND - 0.3V
AVDD + 0.3V
Other pins
GND - 0.3V
AVDD + 0.3V
Operating temperature range: TA
Storage temperature
Package body temperature (soldering, 10 seconds)
0°C
-65°C
+70°C
+150°C
+240°C
Package body temperature (soldering, 2 minutes)
+183°C
Notes: 1. GND denotes the voltage of any ground pin.
2. AGND1 − 6 and DGND1 − 5 pins are intended to be operated at the same potential. Differential voltages
between these pins will degrade performance.
RECOMMENDED OPERATING CONDITIONS
CONDITION
SYMBOL
MIN
TYP
MAX
UNITS
Operating temperature range
TA 0
70 °C
Analogue supply voltage
AVDD1, 2
4.75
5.0
5.25
V
Digital core supply voltage
DVDD1
4.75
5.0
5.25
V
Digital I/O supply voltage
5V I/O
DVDD2, 3
4.75
5.0
5.25
3.3V I/O
DVDD2, 3
2.97
3.3
3.63
V
V
WOLFSON MICROELECTRONICS LTD
AI Rev 3.1 April 2001
4
4페이지 Advanced Information
INPUT VIDEO SAMPLING
MCLK
VSMP
INPUT
VIDEO
tPER
tMCLKH tMCLKL
tVSMPSU
tVSMPH
tVSU
tVH
WM8191
tRSU
tRH
Figure 1 Input Video Timing
Test Conditions
AVDD1 = AVDD2 = DVDD1 = 4.75 to 5.25V, DVDD2 = DVDD3 = 2.97 to 3.63V, AGND = DGND = 0V, TA = 0 to 70°C,
MCLK = 12MHz unless otherwise stated.
PARAMETER
MCLK period
SYMBOL
tPER
TEST CONDITIONS
MIN
83.3
TYP
MCLK high period
tMCLKH
37.5
MCLK low period
tMCLKL
37.5
VSMP set-up time
tVSMPSU
10
VSMP hold time
tVSMPH
5
Video level set-up time
tVSU
15
Video level hold time
tVH
5
Reset level set-up time
tRSU
15
Reset level hold time
tRH
5
Notes: 1.
2.
tVSU and tRSU denote the set-up time required after the input video signal has settled.
Parameters are measured at 50% of the rising/falling edge.
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
OUTPUT DATA TIMING
MCLK
OP[13:0]
Figure 2 Output Data Timing
tPD
WOLFSON MICROELECTRONICS LTD
AI Rev 3.1 April 2001
7
7페이지 | |||
구 성 | 총 27 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
WM8190 | (8+6) Bit Output 14-bit CIS/CCD AFE/Digitiser | Wolfson Microelectronics plc |
WM8191 | 14-bit 6MSPS CIS/CCD Analogue Front End/Digitiser | Wolfson Microelectronics plc |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |