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WM8232 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8232
Beschreibung 70MSPS 3-Channel AFE
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 15 Seiten
WM8232 Datasheet, Funktion
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WM8232
70MSPS 3-Channel AFE with Sensor Timing Generation and
LVDS/CMOS Data Output
DESCRIPTION
The WM8232 is a 16-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 35MSPS.
The device has three analogue signal processing channels
each of which contains Reset Level Clamping, Correlated
Double Sampling (also Sample and Hold), Programmable
Gain, Automatic Gain Control (AGC) and Offset adjust
functions.
The output from each of these channels is time multiplexed,
in pairs, into three high-speed 16-bit Analogue to Digital
Converters. The digital data is available in a variety of
output formats via the flexible data port.
The WM8232 has a user selectable LVDS or CMOS output
architecture.
An internal 8-bit DAC is supplied for internal reference level
generation. This may be used during CDS to reference CIS
signals or during Clamping to clamp CCD signals. An
external reference level may also be supplied. ADC
references are generated internally, ensuring optimum
performance from the device.
A programmable automatic Black Level Calibration function
is available to adjust the DC offset of the output data.
The WM8232 features a sensor timing clock generator for
both CCD and CIS sensors. The clock generator can accept
a slow or fast reference clock input and also has a flexible
timing adjustment function for output timing clocks to allow
use of many different sensors.
FEATURES
70MSPS conversion rate
16 bit ADC resolution
Current consumption – 230mA
3.3V single supply operation
Sample and hold /correlated double sampling
Programmable offset adjust (8-bit resolution)
Flexible clamp timing
Pixel clamp / line clamp mode
Programmable clamp voltage
Programmable CIS/CCD timing generator
Internally generated voltage references
Compliant for Spread Spectrum Clock
LVDS/CMOS output options
- LVDS 5pair 490MHz 35-bit data
- CMOS 90MHz output maximum
Complete on chip clock generator. MCLK 5MHz to 35MHz
Internal timing adjustment
Automatic Gain Control
Automatic Black Level Calibration
56-lead QFN package 8mm x 8mm
Serial control interface
APPLICATIONS
Digital Copiers
USB2.0 compatible scanners
Multi-function peripherals
High-speed CCD/CIS sensor interface
WOLFSON MICROELECTRONICS plc
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Product Brief, February 2012, Rev 3.0
Copyright 2012 Wolfson Microelectronics plc.






WM8232 Datasheet, Funktion
WM8232
PIN NAME
48 IN2
49 AGND2
50 AVDD2
51 NC
52 INP4
53 NC
54 INP6
55 AVDD1
56 AGND1
Type
Analogue input
Supply
Supply
Not connect
Analogue input
Not connect
Analogue input
Supply
Supply
DESCRIPTION
Analogue input 2
Analogue ground
Analogue supply
Not connected internally
Analogue input 4
Not connected internally
Analogue input 6
Analogue supply
Analogue ground
Product Brief
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Product Brief, Rev 3.0, February 2012
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6 Page









WM8232 pdf, datenblatt
WM8232
RECOMMENDED EXTERNAL COMPONENT VALUES
COMPONENT
REFERENCE
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
SUGGESTED
VALUE
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
0.01uF
10uF
1uF
1uF
1uF
10uF
10uF
10uF
10uF
10uF
10uF
10uF
DESCRIPTION
De-coupling for AVDD1
De-coupling for AVDD2
De-coupling for DBVDD
De-coupling for LDO1VDD
De-coupling for LDO2VDD
De-coupling for VREF1C
De-coupling for VREF2C
De-coupling for VREF3C
High frequency decoupling between VREF1C and VREF3C
Low frequency decoupling between VREF1C and VREF3C
De-coupling for VRLC/VBIAS
De-coupling for LDO1VOUT
De-coupling for LDO2VOUT
Reservoir capacitor for AVDD1
Reservoir capacitor for AVDD2
Reservoir capacitor for DBVDD
Reservoir capacitor for LDO1VDD
Reservoir capacitor for LDO2VDD
Reservoir capacitor for LDOOUT
Reservoir capacitor for LDOOUT
Table 1 External Components Description
Product Brief
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Product Brief, Rev 3.0, February 2012
12

12 Page





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