WM8214 Datasheet, PDF (1/35 Pages) Wolfson Microelectronics plc – 40MSPS 16 BIT CCD DIGITISER

w
40MSPS 16-bit CCD Digitiser
WM8214
DESCRIPTION
The WM8214 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 40MSPS.
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 16-bit
Analogue to Digital Converter. The digital output data is
available in 8-bit wide multiplexed format and there is also
an optional single byte output mode, or 4-bit multiplexed
LEGACY mode.
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. An external reference level may also be supplied.
ADC references are generated internally, ensuring optimum
performance from the device.
Using an analogue supply voltage of 3.3V and a digital
interface supply of 3.3V, the WM8214 typically only
consumes 390mW.
BLOCK DIAGRAM
FEATURES
• 16-bit ADC
• 40MSPS conversion rate
• Low power – 390mW typical
• 3.3V single supply operation
• Single, 2 or 3 channel operation
• Correlated double sampling
• Programmable gain (9-bit resolution)
• Programmable offset adjust (8-bit resolution)
• Flexible clamp control with programmable clamp voltage
• Flexible timing, can be made compatible with WM819X
and WM815X parts.
• 8-bit wide multiplexed data output format
• 8-bit only output mode
• 4-bit LEGACY multiplexed nibble mode
• Internally generated voltage references
• 28-pin SSOP package, pin compatible with WM8199
• Serial control interface
APPLICATIONS
• High speed USB2.0 compatible scanners
• Multi-function peripherals
• High-performance CCD sensor interface
• Digital Copiers
VRLC/VBIAS
RSMP VSMP
MCLK
AVDD DVDD1 DVDD2
RINP
CLMP R_S V_S
RLC
TIMING CONTROL
w
WM8214
CDS
R_{M 8}
GU
X
B
OFFSET
DAC
VREF/BIAS
+ PGA
R_M
GU
X
B
I/P SIGNAL
9
POLARITY
ADJUST
GINP
RLC
CDS
+ PGA
8
OFFSET
DAC
9
I/P SIGNAL
POLARITY
ADJUST
VRT VRX VRB
+
M
+U
X
16-
BIT
ADC
DATA
O/P
PORT
OEB
OP[0]
OP[1]
OP[2]
OP[3]
OP[4]
OP[5]
OP[6]
OP[7]/SDO
BINP
RLC
RLC ₄
DAC
CDS
+ PGA
+
8
OFFSET
DAC
9
I/P SIGNAL
POLARITY
ADJUST
CONFIGURABLE
SERIAL
CONTROL
INTERFACE
SEN
SCK
SDI
WOLFSON MICROELECTRONICS plc
AGND1
AGND2
DGND
Product Preview, March 2004, Rev 1.6
w :: www.wolfsonmicro.com
Copyright 2004 Wolfson Microelectronics plc.