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WM8234
70MSPS 6-Channel AFE with Sensor Timing Generation and
LVDS/CMOS Data Output
DESCRIPTION
The WM8234 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 23MSPS.
The device has six 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 two 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 WM8234 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 WM8234 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 – 280mA
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 23MHz
Internal timing adjustment
Automatic Gain Control
Automatic Black Level Calibration
56-lead QFN package 7mm x 7mm
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.

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WM8234
BLOCK DIAGRAM
Product Brief
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WM8234
TABLE OF CONTENTS
Product Brief
DESCRIPTION....................................................................................................... 1 
FEATURES ............................................................................................................ 1 
APPLICATIONS..................................................................................................... 1 
BLOCK DIAGRAM ................................................................................................ 2 
TABLE OF CONTENTS......................................................................................... 3 
PIN CONFIGURATION .......................................................................................... 4 
ORDERING INFORMATION.................................................................................. 4 
PIN DESCRIPTION................................................................................................ 5 
ABSOLUTE MAXIMUM RATINGS ........................................................................ 7 
RECOMMENDED OPERATING CONDITIONS..................................................... 7 
ELECTRICAL CHARACTERISTICS ..................................................................... 8 
GENERAL CHARACTERISTICS..................................................................................... 9 
APPLICATIONS INFORMATION ........................................................................ 11 
RECOMMENDED EXTERNAL COMPONENTS ........................................................... 11 
RECOMMENDED EXTERNAL COMPONENT VALUES .............................................. 12 
PACKAGE DIMENSIONS.............................................................................................. 13 
IMPORTANT NOTICE ......................................................................................... 14 
ADDRESS: .................................................................................................................... 14 
REVISION HISTORY ........................................................................................... 15 
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WM8234
PIN CONFIGURATION
56 55 54 53 52 51 50 49 48 47 46 45 44 43
VREF2C 1
42 CLK8
VRLC/VBIAS 2
41 CLK7
VREF3C 3
40 CLK6
VREF1C 4
39 CLK5
SEN 5
38 CLK4
SDO 6
37 CLK3
SCK 7
SDI 8
WM8234
36 CLK2
35 CLK1
LDO2VDD 9
34 TGSYNC
LDO2GND 10
LDO2VOUT 11
DSLCT2 12
33 LDOV1DD
32 LDO1GND
31 LDO1VOUT
MCLK 13
30 MON
DSLCT1 14
29 HZCTRL
15 16 17 18 19 20 21 22 23 24 25 26 27 28
Product Brief
ORDERING INFORMATION
DEVICE
TEMPERATURE
RANGE
WM8234GEFL/V
-40 to 85oC
WM8234GEFL/RV
-40 to 85oC
Reel quantity = 2,200
PACKAGE
56-lead QFN
(7X7x0.85mm)
(Pb-free)
56-lead QFN
(7X7x0.85mm)
(Pb-free, tape and reel)
MOISTURE
SENSITIVITY
LEVEL
MSL3
MSL3
PEAK SOLDERING
TEMPERATURE
260C
260C
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WM8234
Product Brief
PIN DESCRIPTION
PIN NAME
Type
DESCRIPTION
1 VREF2C Analogue output Mid reference voltage.
This pin must be connected to AGND via a decoupling capacitor.
2
VRLC
Analogue I/O Reference voltage input/output
3 VREF3C Analogue output Lower reference voltage.
This pin must be connected to AGND via a decoupling capacitor.
4 VREF1C Analogue output Upper reference voltage.
This pin must be connected to AGND via a decoupling capacitor.
5
SEN
Digital input Enables the serial interface when high.
6
SDO
Digital output Serial interface data output
7
SCK
Digital input Serial interface clock
8 SDI Digital input Serial interface data input
9 LDO2VDD
Supply
Analogue supply
10 LDO2GND
Supply
Analogue ground
11 LDO2VOUT
Supply
LDO output
This pin must be connected to AGND via a decoupling capacitor.
12
DSLCT2
Analogue input Device select 2
13
MCLK
Analogue input Master clock
14
DSLCT1
Analogue input Device select 1
15
D5N/OP[9]
LVDS output LVDS Data output 5 – Negative / CMOS output 11
16
D5P/OP[8]
LVDS output LVDS Data output 5 – Positive / CMOS output 10
17
D4N/OP[7]
LVDS output LVDS Data output 4 – Negative / CMOS output 9
18
D4P/OP[6]
LVDS output LVDS Data output 4 – Positive / CMOS output 8
19 DCLKN/OC[2] LVDS output LVDS Clock Output – Negative/ CMOS clock output 2
20 DCLKP/OC[1] LVDS output LVDS Clock Output – Positive/ CMOS clock output 1
21 DBGND
Supply
Analogue ground
22 DBVDD
Supply
Analogue supply
23
D3N/OP[5]
LVDS output LVDS Data output 3 – Negative / CMOS output 5
24
D3P/OP[4]
LVDS output LVDS Data output 3 – Positive / CMOS output 4
25
D2N/OP[3]
LVDS output LVDS Data output 2 – Negative / CMOS output 3
26
D2P/OP[2]
LVDS output LVDS Data output 2 – Positive / CMOS output 2
27
D1N/OP[1]
LVDS output LVDS Data output 1 – Negative / CMOS output 1
28
D1P/OP[0]
LVDS output LVDS Data output 1 – Positive / CMOS output 0
29
HZCTRL
Digital input Internal use only. Must be connected to AGND.
30
MON
Analogue output Clock monitor
31 LDO1VOUT
Supply
LDO output.
This pin must be connected to AGND via a decoupling capacitor.
32 LDO1GND
Supply
Analogue ground
33 LDO1VDD
Supply
Analogue supply
34
TGSYNC
Digital input Sensor Timing Sync pulse from host
35
CLK1
Digital output Sensor Timing Output 1
36
CLK2
Digital output Sensor Timing Output 2
37
CLK3
Digital output Sensor Timing Output 3
38
CLK4
Digital output Sensor Timing Output 4
39
CLK5
Digital output Sensor Timing Output 5
40
CLK6
Digital output Sensor Timing Output 6
41
CLK7
Digital output Sensor Timing Output 7
42
CLK8
Digital output Sensor Timing Output 8
43 AGND3
Supply
Analogue ground
44
CLK9
Digital output Sensor Timing Output 9
45
CLK10
Digital output Sensor Timing Output 10
46
CLK11
Digital output Sensor Timing Output 11
47 AGND2
Supply
Analogue ground
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