wm8199scds-v Wolfson Microelectronics plc, wm8199scds-v Datasheet

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wm8199scds-v

Manufacturer Part Number
wm8199scds-v
Description
20msps 16-bit Ccd Digitiser
Manufacturer
Wolfson Microelectronics plc
Datasheet
w
DESCRIPTION
The WM8199 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 20MSPS.
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 or 4-bit wide multiplexed format.
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 5V and a digital
interface supply of either 5V or 3.3V, the WM8199 typically
only consumes 358mW when operating from a single
5V supply.
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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RINP
GINP
BINP
VRLC/VBIAS
RLC
RLC
RLC
DAC
RLC
CL
4
M
U
X
R
S
V
S
20MSPS 16-bit CCD Digitiser
at
TIMING CONTROL
CDS
CDS
CDS
http://www.wolfsonmicro.com/enews/
VSMP
R
G
B
R
G
B
MCLK
M
U
X
M
U
X
AGND1
8
8
8
OFFSET
DAC
OFFSET
DAC
OFFSET
DAC
w
WM8199
AVDD
+
+
+
AGND2
FEATURES
APPLICATIONS
PGA
PGA
PGA
8
8
8
16-bit ADC
20MSPS conversion rate
30MSPS conversion rate at 8-bits
Low power – 358mW 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
8 or 4-bit wide multiplexed data output formats
Internally generated voltage references
28-lead SSOP package
Serial control interface
Flatbed and sheetfeed scanners
USB compatible scanners
Multi-function peripherals
High-performance CCD sensor interface
DVDD1
I/P SIGNAL
I/P SIGNAL
I/P SIGNAL
VREF/BIAS
POLARITY
POLARITY
POLARITY
ADJUST
ADJUST
ADJUST
DVDD2
DGND
Copyright ©2008 Wolfson Microelectronics plc
+
+
+
M
U
X
Production Data, July 2008, Rev 4.4
VRT
CONFIGURABLE
ADC
BIT
16-
INTERFACE
VRX
CONTROL
SERIAL
WM8199
VRB
DATA
PORT
I/O
OEB
OP[0]
OP[1]
OP[2]
OP[3]
OP[4]
OP[5]
OP[6]
OP[7]/SDO
SEN
SCK
SDI
RLC/ACYC

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wm8199scds-v Summary of contents

Page 1

... WM8199 DVDD2 VRT VRX VRB VREF/BIAS + POLARITY ADJUST DATA I/O M 16- BIT PORT + U X ADC POLARITY ADJUST + POLARITY CONFIGURABLE ADJUST SERIAL CONTROL INTERFACE DGND Production Data, July 2008, Rev 4.4 Copyright ©2008 Wolfson Microelectronics plc OEB OP[0] OP[1] OP[2] OP[3] OP[4] OP[5] OP[6] OP[7]/SDO SEN SCK SDI RLC/ACYC ...

Page 2

WM8199 DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 PIN DESCRIPTION ................................................................................................4 ABSOLUTE MAXIMUM RATINGS.........................................................................5 RECOMMENDED OPERATING CONDITIONS .....................................................5 THERMAL PERFORMANCE .................................................................................5 ELECTRICAL CHARACTERISTICS ......................................................................6 TYPICAL HIGH SPEED PERFORMANCE..................................................................... 8 INPUT ...

Page 3

... AGND2 2 DVDD1 3 OEB 4 VSMP 5 RLC/ACYC 6 MCLK 7 DGND 8 SEN 9 DVDD2 10 SDI 11 SCK 12 OP[0] 13 OP[1] 14 ORDERING INFORMATION TEMPERATURE DEVICE RANGE o WM8199SCDS WM8199SCDS/ Note: Reel quantity = 2,000 w 28 GINP 27 BINP 26 VRLC/VBIAS 25 VRX 24 VRT 23 VRB 22 AGND1 21 AVDD 20 OP[7]/SDO 19 OP[6] 18 OP[5] 17 OP[4] 16 OP[3] 15 OP[2] MOISTURE SENSITIVITY ...

Page 4

WM8199 PIN DESCRIPTION PIN NAME TYPE 1 RINP Analogue input 2 AGND2 Supply 3 DVDD1 Supply 4 OEB Digital input 5 VSMP Digital input 6 RLC/ACYC Digital input 7 MCLK Digital input 8 DGND Supply 9 SEN Digital input 10 ...

Page 5

WM8199 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 ...

Page 6

WM8199 ELECTRICAL CHARACTERISTICS Test Conditions AVDD = DVDD1 = 5.0V, DVDD2 = 3.3V, AGND = DGND = 0V, T PARAMETER Overall System Specification (including 16-bit ADC, PGA, Offset and CDS functions) Conversion rate Full-scale input voltage range (see Note 1) ...

Page 7

WM8199 Test Conditions AVDD = DVDD1 = 5.0V, DVDD2 = 3.3V, AGND = DGND = 0V, T PARAMETER Programmable Gain Amplifier Resolution Gain Max gain, each channel Min gain, each channel Gain error, each channel Analogue to Digital Converter Resolution ...

Page 8

WM8199 TYPICAL HIGH SPEED PERFORMANCE The WM8199 is capable of operating at speeds greater than 20MSPS with a reduction in linearity. Figures 1 and 2 below show the typical 8-bit performance at 30MSPS. 0.25 0.2 0.15 0.1 0. ...

Page 9

WM8199 INPUT VIDEO SAMPLING t MCLK t VSMPSU VSMP INPUT VIDEO Figure 3 Input Video Timing Note: 1. See Page 20 (Programmable VSMP Detect Circuit) for video sampling description. Test Conditions AVDD = DVDD1 = 5.0V, DVDD2 = 3.3V, AGND ...

Page 10

WM8199 OEB OP[7:0] Hi-Z Figure 5 Output Data Enable Timing Test Conditions AVDD = DVDD1 = 5.0V, DVDD2 = 3.3V, AGND = DGND = 0V, T PARAMETER Output propagation delay Output enable time Output disable time MCLK t ACYCSU RLC/ACYC ...

Page 11

WM8199 Test Conditions AVDD = DVDD1 = 5.0V, DVDD2 = 23.3V, AGND = DGND = 0V, T PARAMETER SCK period SCK high SCK low SDI set-up time SDI hold time SCK to SEN set-up time SEN to SCK set-up time ...

Page 12

WM8199 INTERNAL POWER ON RESET CIRCUIT Figure 8 Internal Power On Reset Circuit Schematic The WM8199 includes an internal Power-On-Reset Circuit, as shown in Figure 8, which is used to reset the digital logic into a default state after power ...

Page 13

WM8199 Figure 10 Typical Power up Sequence where DVDD1 is Powered before AVDD Figure 10 shows a typical power-up sequence where DVDD1 is powered up first assumed that DVDD1 is already up to specified operating voltage. When AVDD ...

Page 14

WM8199 DEVICE DESCRIPTION INTRODUCTION A block diagram of the device showing the signal path is presented on Page 1. The WM8199 samples up to three inputs (RINP, GINP and BINP) simultaneously. The device then processes the sampled video signal with ...

Page 15

WM8199 EXTERNAL VRLC Figure 11 Reset Level Clamping and CDS Circuitry If auto-cycling is not required, RLC can be selected by pin RLC/ACYC. Figure 12 illustrates control of RLC for a typical CCD waveform, with CL applied during the reset ...

Page 16

WM8199 R /CL (CDSREF = 00 /CL (CDSREF = 01 /CL (CDSREF = 10 /CL (CDSREF = 11) S Figure 13 Reset Sample and Clamp Timing For CIS type sensor signals, non-CDS processing is ...

Page 17

WM8199 OVERALL SIGNAL FLOW SUMMARY Figure 16 represents the processing of the video signal through the WM8199 RESET V VRLC VRLCEXT=1 Figure 16 Overall Signal Flow The INPUT SAMPLING BLOCK produces an effective input voltage V difference ...

Page 18

WM8199 OFFSET DAC BLOCK: OFFSET (BLACK-LEVEL) ADJUST The resultant signal V PGA NODE: GAIN ADJUST The signal is then multiplied by the PGA gain, ADC BLOCK: ANALOGUE-DIGITAL CONVERSION The analogue signal is then converted to a 16-bit unsigned number, with ...

Page 19

WM8199 CONTROL INTERFACE The internal control registers are programmable via the serial digital control interface. The register contents can be read back via the serial interface on pin OP[7]/SDO. Note recommended that a software reset is carried out ...

Page 20

WM8199 PROGRAMMABLE VSMP DETECT CIRCUIT The VSMP input is used to determine the sampling point and frequency of the WM8199. Under normal operation a pulse of 1 MCLK period should be applied to VSMP at the desired sampling frequency (as ...

Page 21

WM8199 POWER MANAGEMENT Power management for the device is performed via the Control Interface. The device can be powered on or off completely by setting the EN bit and SELPD bit low. Alternatively, when control bit SELPD is high, only ...

Page 22

WM8199 OPERATING MODES Table 5 summarises the most commonly used modes, the clock waveforms required and the register contents required for CDS and non-CDS operation. MODE DESCRIPTION CDS AVAILABLE 1 Colour Yes Pixel-by-Pixel 2 Monochrome/ Yes Colour Line-by-Line 3 Fast ...

Page 23

WM8199 OPERATING MODE TIMING DIAGRAMS The following diagrams show 8-bit multiplexed output data and MCLK, VSMP and input video requirements for operation of the most commonly used modes as shown in Table 5. The diagrams are identical for both CDS ...

Page 24

WM8199 Figure 25 Mode 3 Operation Figure 26 Mode 4 Operation w Production Data PD, Rev 4.4, July 2008 24 ...

Page 25

WM8199 16.5 MCLK PERIODS MCLK VSMP INPUT VIDEO OP[7: (DEL = 00) OP[7: (DEL = 01) ...

Page 26

WM8199 DEVICE CONFIGURATION REGISTER MAP The following table describes the location of each control bit used to determine the operation of the WM8199. The register map is programmed by writing the required codes to the appropriate addresses via the serial ...

Page 27

WM8199 REGISTER MAP DESCRIPTION The following table describes the function of each of the control bits shown in Table 6. REGISTER BIT BIT NO NAME(S) Setup 0 EN Register 1 1 CDS 2 MONO 3 SELPD 5:4 PGAFS[1:0] 6 MODE4 ...

Page 28

WM8199 REGISTER BIT BIT NO NAME(S) Setup 0 LINEBYLINE Register 4 1 ACYCNRLC 2 FME 3 RLCINT 5:4 INTM[1:0] 7:6 FM[1:0] Setup 0 VSMPDET Register 5 3:1 VDEL[2:0] 4 POSNNEG 7:5 Reserved Setup 3:0 SELDIS[3:0] Register 6 7:4 Reserved w ...

Page 29

WM8199 REGISTER BIT BIT NO NAME(S) Offset DAC 7:0 DAC[7:0] (Red) Offset DAC 7:0 DAC[7:0] (Green) Offset DAC 7:0 DAC[7:0] (Blue) Offset DAC 7:0 DAC[7:0] (RGB) PGA gain 7:0 PGA[7:0] (Red) PGA gain 7:0 PGA[7:0] (Green) PGA gain 7:0 PGA[7:0] ...

Page 30

WM8199 RECOMMENDED EXTERNAL COMPONENTS DVDD1 DVDD2 C1 C2 AVDD DGND AGND Video Inputs AGND Timing Signals Interface Controls NOTES: 1. C1-9 should be fitted as close to WM8199 as possible. 2. AGND and DGND should be connected as close to ...

Page 31

WM8199 PACKAGE DIMENSIONS DS: 28 PIN SSOP (10.2 x 5.3 x 1.75 mm Dimensions Symbols (mm) MIN NOM A ----- A 0. 1.65 1. 0.22 c 0.09 D 9.90 10.20 ...

Page 32

... WM8199 IMPORTANT NOTICE Wolfson Microelectronics plc (“Wolfson”) products and services are sold subject to Wolfson’s terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice ...

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