Acquisition System. WM8144-12 Datasheet

WM8144-12 System. Datasheet pdf. Equivalent


Wolfson Microelectronics WM8144-12
WM8144-12
Production Data
February 1998 Rev. 4.1
Integrated 12-bit Data Acquisition System for
Imaging Applications
Description
Features
WM8144-12 integrates the analogue signal conditioning
required by CCD sensors with a 12-bit ADC and optional
pixel-by-pixel image compensation. WM8144-12 requires
minimal external circuitry and provides a cost effective
sensor-to-digital domain system solution.
Each analogue conditioning channel provides reset level
clamp, CDS, fine offset level shifting and gain
amplification. The three channels are multiplexed into the
ADC. Output from the ADC can either be direct or passed
through a digital post-processing function. The post-
processing provides compensation for variations in offset
and shading on a pixel-by-pixel basis.
• Reset level clamp
• Correlated Double Sampling (CDS)
• Fine offset level shifting
• Programmable Gain Amplification
• 12-Bit ADC with maximum 4 MSPS
• Digital post-processing for pixel-by-pixel
image compensation
• Simple clocking scheme
• Control by serial or parallel interface
• Time-multiplexed eight-bit data output mode
• 48 pin TQFP package
• Pin compatible with WM8144-10
The flexible output architecture allows twelve-bit data to
be accessed either on a twelve-bit bus or via a time-
multiplexed eight-bit bus. The WM8144-12 can be
configured for pixel-by-pixel or line-by-line multiplexing
operation. Reset level clamp and/or CDS features can be
optionally bypassed. Device configuration is either by a
simple serial or eight-bit parallel interface.
Applications
• Document scanners
• CCD sensor interfaces
• Contact image sensor (CIS) interfaces
Block Diagram
VRLC
VRU VRT
VRB VRL
VMID
VSMP MCLK RLC
AVDD AGND DVDD1 DVDD2 DGND
VMID
RINP
GINP
BINP
MUX
CL RS VS
S/H
S/H
PGA
CDS
5-BIT REG
S/H
S/H
PGA
CDS
5-BIT REG
S/H
S/H
PGA
CDS
5-BIT REG
TIMING CONTROL
OFFSET
8-BIT + SIGN
DAC
VMID
OFFSET
8-BIT + SIGN
DAC
VMID
OFFSET
8-BIT + SIGN
DAC
VMID
WM8144-12
EXTERNAL
DATA STORE
INTERFACE
M
U
X
12 BIT
ADC
IMAGE
COMPENSATION
PROCESSING
12/8
MUX
CONFIGURABLE
SERIAL/PARALLEL
CONTROL INTERFACE
CC[2:0]
DV
CDATA(7:0)
ORNG
OEB
OP[11:0]
PNS
SDI / DNA
SCK / RNW
SEN / STB
NRESET
Production Data data sheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics standard terms and condi-
tions.
Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176
email:sales@wolfson.co.uk
www: http://www.wolfson.co.uk
© 1998 Wolfson Microelectronics
1


WM8144-12 Datasheet
Recommendation WM8144-12 Datasheet
Part WM8144-12
Description Integrated 12-bit Data Acquisition System
Feature WM8144-12; WM8144-12 Production Data February 1998 Rev. 4.1 Integrated 12-bit Data Acquisition System for Ima.
Manufacture Wolfson Microelectronics
Datasheet
Download WM8144-12 Datasheet




Wolfson Microelectronics WM8144-12
WM8144-12
Package Outline
CDATA3
CDATA2
CDATA1
CDATA0
DGND
OP11
OP10
OP9
OP8
OP7
OP6
OP5
37
38
39
40
41
42
43
44
45
46
47
48
WM8144-12
24 PNS
23 RINP
22 GINP
21 BINP
20 VMID
19 VRLC
18 AGND
17 AVDD
16 VRL
15 VRU
14 VRB
13 VRT
Ordering Information
DEVICE
TEMP RANGE
WM8144-12CFT/V 00C - 700C
PACKAGE
48 Pin TQFP
Absolute Maximum Ratings
Analogue Supply Voltage. . . AGND - 0.3 V, AGND +7 V
Digital Supply Voltage. . . . DGND - 0.3 V, DGND +7 V
Digital Inputs . . . . . . . . .DGND - 0.3 V, DVDD + 0.3 V
Digital Outputs. . . . . . . .DGND - 0.3 V, DVDD + 0.3 V
Reference inputs . . . . . . AGND - 0.3 V, AVDD + 0.3 V
RINP, GINP, BINP . . . . . . AGND - 0.3 V, AVDD + 0.3 V
Operating temperature range, TA . . . . . . 0oC to +70oC
Storage Temperature . . . . . . . . . . -50oC to +150oC
Lead Temperature (soldering, 10 sec) . . . . . . +260oC
Note: 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 range limits and guaranteed
performance specifications are given under Electrical Characteristics at the test conditions specified.
ESD Sensitive Device. The WM8144-12 is manufactured on a CMOS process. It is therefore generically
susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling
and storage of this device.
As per JEDEC specifications A112-A and A113-A this product requires specific storage conditions prior to
surface mount assembly. It has been classified as having a Moisture Sensitivity level of 2 and as such will be
supplied in vacuum sealed moisture barrier bags.
Recommended Operating Conditions
PARAMETER
Supply Voltage
Operating Temperature Range
Input Common Mode Range
TA
VCMR
TEST CONDITIONS
MIN
4.75
0
0.5
TYP
MAX UNIT
5.25 V
70 oC
4.5 V
Wolfson Microelectronics
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Wolfson Microelectronics WM8144-12
WM8144-12
Electrical Characteristics
VDD = 4.75V to 5.25V, GND = 0 V, ........TA = 0oC to +70oC, MLCK = 8MHz unless otherwise stated.
PARAMETER
Supply Current - Active
Supply Current - Standby
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
Voltage output range
High Impedance Output Current
Input Multiplexer
Channel to Channel Gain Matching
Input Video Set-up Time
Input Video Hold Time
Reset Video Set-up Time
Reset Video Hold Time
Reference String
Reference Voltage - Top
Reference Voltage - Bottom
DAC Reference Voltage
R.L.C. Switch Impedence
Reset Level Clamp Options
Impedance VRT to VRB
Impedance VRU to VRL
8-bit DACs
Resolution
Zero Code Voltage
Full Scale Voltage Error
Differential Non Linearity
Integral Non Linearity
TEST CONDITIONS MIN
TYP
110.0
10.0
MAX UNIT
150 mA
15 mA
VIH
0.8*DVDD
V
VIL 0.2*DVDD V
IIH 1.0 µA
IIL 1.0 µA
10.0 pF
VOH
VOL
IOZ
IOH = 1.0mA
IOL = 1.0mA
DVDD-0.75
DGND+0.75
1.0
V
V
µA
tVSU
tVH
tRSU CDS Mode only
tRH CDS Mode only
10
25
10
25
VRT VRU = 5.00 V, VRL = 0.00V
VRB VRU = 5.00 V, VRL = 0.00V
VMID VRU = 5.00 V, VRL = 0.00V
3.465
1.465
2.475
VRLC VRU = 5.00 V, VRL = 0.00V
Voltage set by user
configuration - Table 7
1.425
2.375
3.325
490
1190
0.5
3.5
1.5
2.5
200
1.5
2.5
3.5
700
1700
%
ns
ns
ns
ns
3.535 V
1.535 V
2.525 V
Ohms
1.575 V
2.625 V
3.675 V
910 Ohms
2210 Ohms
DNL
INL
8 Bits
VDAC -10
VDAC+10 mV
0 10 mV
0.1 1 LSB
0.4 1 LSB
Wolfson Microelectronics
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