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WM8141 데이터시트 PDF




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부품번호 WM8141 기능
기능 12-bit 6MSPS CIS/CCD Analogue Front End/Digitiser
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WM8141 데이터시트, 핀배열, 회로
WM8141
12-bit 6MSPS CIS/CCD Analogue Front End/Digitiser
Production Data, October 2000, Rev 3.0
DESCRIPTION
The WM8141 is a 12-bit analogue front end/digitiser that
processes and digitises the analogue output signals from
CCDs or Contact Image Sensors (CIS). The device can be
operated as either a three channel or a single channel
device at pixel sample rates of up to 6MSPS. The device
has both external and programmable internal black level
reference options for CIS operation. The WM8141 runs off a
single supply voltage of either 3.3V or 5V. Alternatively, the
device can be operated from split 5V core and 3.3V digital
interface supplies.
The WM8141 includes three analogue signal processing
channels each of which contains reset level clamping,
correlated double sampling and programmable offset and
gain adjust facilities. Each of these channels is time
multiplexed into a single high-speed 12-bit resolution ADC,
which digitises the pixel image information. The digital data
output is available to the user in either 12-bit parallel or
8/6/4-bit wide multiplexed formats.
The internal control registers are programmable via a
convenient serial or parallel digital interface. The WM8141
typically consumes only 45mA and less than 10µA when in
power down mode.
FEATURES
12-bit resolution ADC
6MSPS conversion rate at 5V supply
5V or 3.3V 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)
12-bit parallel or 8/6/4-bit wide multiplexed output bus
Internally generated voltage references
External or internal reference for CIS operation
Low power – 225mW typical at 5V supply
Interface and timing compatible with WM8143, WM8144
and WM8142 devices
Drop in replacement for WM8143-12
32-pin TQFP package
APPLICATIONS
Flatbed and sheetfeed scanners
USB compatible scanners
Multi-function peripherals
CCD sensor interface
Contact image sensor (CIS) interface
BLOCK DIAGRAM
VRLC/VBIAS
(18)
VSMP MCLK
(27) (28)
AVDD DVDD1 DVDD2
(12) (14) (32)
VRT VRX VRB
(16) (17) (15)
RINP (21)
GINP (20)
BINP (19)
CL
RLC
RLC
RS
M
U
X
VS TIMING CONTROL
CDS
RM
GU
X
B
8
OFFSET
DAC
+ PGA
VREF/BIAS
RM
GU
X
B
I/P SIGNAL
8 POLARITY
ADJUST
CDS
+ PGA
8 OFFSET
DAC
8 I/P SIGNAL
POLARITY
ADJUST
+
M
+U
X
WM8141
(22) OEB
12
BIT
ADC
DATA
I/O
PORT
(30) OP[0]
(31) OP[1]
(1) OP[2]
(2) OP[3]
(3) OP[4]
(4) OP[5]
(5) OP[6]
(6) OP[7]
(7) OP[8]
(8) OP[9]
(9) OP[10]
(10) OP[11]/SDO
RLC
RLC 4
DAC
CDS
+ PGA
+
8 OFFSET
DAC
8 I/P SIGNAL
POLARITY
ADJUST
CONFIGURABLE
SERIAL/
PARALLEL
CONTROL
INTERFACE
(23) SEN/STB
(25) SCK/RNW
(24) SDI/DNA
(26) RLC/ACYC
(11) NRESET
(13)
AGND
(29)
DGND
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
http://www.wolfson.co.uk
Production Data Datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2000 Wolfson Microelectronics Ltd.




WM8141 pdf, 반도체, 판매, 대치품
WM8141
Production Data
RECOMMENDED OPERATING CONDITIONS
CONDITION
Operating temperature range
Digital supply voltages (5V operation)
Digital supply voltages (3.3V operation)
Analogue supply voltage (5V operation)
Analogue supply voltage (3.3V operation)
SYMBOL
TA
DVDD1, DVDD2
DVDD1, DVDD2
AVDD
AVDD
MIN
0
4.75
2.97
4.75
2.97
POSSIBLE POWER SUPPLY COMBINATIONS
COMBINATION
1
2
3
AVDD, DVDD1 (VOLTS)
5
5
3.3
ELECTRICAL CHARACTERISTICS
TYP
MAX
UNITS
70 °C
5 5.25 V
3.3 3.63
V
5 5.25 V
3.3 3.63
V
DVDD2 (VOLTS)
5
3.3
3.3
ANALOGUE CHARACTERISTICS (5V OPERATION)
Test Conditions
AVDD = DVDD1 = DVDD2 = 4.75 to 5.25V, AGND = DGND = 0V, TA = 0 to 70°C, MCLK = 12MHz unless otherwise stated.
PARAMETER
SYMBOL
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
Overall System Specification Including CDS, PGA, OFFSET and ADC Functions. No Missing Codes Guaranteed.
Full-scale input voltage range
Max Gain
0.4 Vp-p
(see Note 1)
Min Gain
4.08 Vp-p
Input signal limits (see Note 2)
VIN
0
AVDD
V
Full-scale transition error
Gain = 0dB;
PGA[7:0] = 4B(hex)
20 mV
Zero-scale transition error
Gain = 0dB;
PGA[7:0] = 4B(hex)
20 mV
Differential non-linearity
DNL
0.5 1 LSB
Integral non-linearity
INL
2 LSB
Channel to channel gain matching
1%
References
Upper reference voltage
VRT
2.70
2.85 3.00
V
Lower reference voltage
VRB
1.25
1.35 1.45
V
Input return bias voltage
VRX
0.60
0.65 0.70
V
Diff. reference voltage (VRT-VRB)
VRTB
1.4 1.5 1.6 V
Output resistance VRT, VRB, VRX
1
WOLFSON MICROELECTRONICS LTD
PD Rev 3.0 October 2000
4

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WM8141 전자부품, 판매, 대치품
Production Data
WM8141
Test Conditions
AVDD = DVDD1 = DVDD2 = 2.97V to 3.63V, AGND = DGND = 0V, TA = 0 to 70°C, MCLK = 8MHz unless otherwise stated.
PARAMETER
Supply Currents
Total supply current active
Total analogue supply current
active
Digital logic supply current,
DVDD1 active
Digital I/O supply current,
DVDD2 active
Supply current full power down
mode
SYMBOL
IAVDD
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
43 mA
40 mA
2 mA
1 mA
10 µA
DIGITAL CHARACTERISTICS
Test Conditions
AVDD = DVDD1 = DVDD2 = 2.97V to 5.25V, AGND = DGND = 0V, TA = 0 to 70°C, MCLK = 12MHz unless otherwise stated.
PARAMETER
DIGITAL SPECIFICATIONS
Digital Inputs
High level input voltage
Low level input voltage
High level input current
Low level input current
Input capacitance
Digital Outputs
High level output voltage
Low level output voltage
High impedance output current
Digital IO Pins
Applied high level input voltage
Applied low level input voltage
High level output voltage
Low level output voltage
Low level input current
High level input current
Input capacitance
High impedance output current
SYMBOL
VIH
VIL
IIH
IIL
CI
VOH
VOL
IOZ
VIH
VIL
VOH
VOL
IIL
IIH
CI
IOZ
TEST
CONDITIONS
MIN
TYP
MAX
UNIT
IOH = 1mA
IOL = 1mA
IOH = 1mA
IOL = 1mA
0.8 DVDD2
V
0.2 DVDD2 V
1 µA
1 µA
5 pF
DVDD2 - 0.5
V
0.5 V
1 µA
0.8 DVDD2
V
0.2 DVDD2 V
DVDD2 - 0.5
V
0.5 V
1 µA
1 µA
5 pF
1 µA
WOLFSON MICROELECTRONICS LTD
PD Rev 3.0 October 2000
7

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