lm9820ccwmx National Semiconductor Corporation, lm9820ccwmx Datasheet

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lm9820ccwmx

Manufacturer Part Number
lm9820ccwmx
Description
10/12-bit Image Sensor Processor Analog Front End
Manufacturer
National Semiconductor Corporation
Datasheet

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©1997,1998 National Semiconductor Corporation
N
LM9810/20 10/12-Bit Image Sensor Processor Analog Front End
General Description
The LM9810 and LM9820 are high performance Analog Front
Ends (AFEs) for image sensor processing systems. The
LM9810/20 performs all the analog and mixed signal functions
(correlated double sampling, color specific gain and offset cor-
rection, and analog to digital conversion) necessary to digitize
the output of a wide variety of CIS and CCD sensors. The
LM9810 has a 10 bit 6MHz ADC, and the LM9820 has a 12 bit
6MHz ADC. The LM9810 and LM9820 are pin-for-pin and func-
tionally compatible.
Applications
Connection Diagrams
Ordering Information
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
Color Flatbed Document Scanners
Color Sheetfed Scanners
Multifunction Imaging Products
Digital Copiers
General Purpose Linear CCD Imaging
Commercial (0°C
LM9810CCWM
LM9810CCWMX
LM9820CCWM
LM9820CCWMX
RefBypass
SampCLK
V
REFMID
AGND
V
V
REF+
OS
OS
OS
REF-
VA
R
G
B
T
A
1
2
3
4
5
6
7
8
9
10
+70°C)
LM9810
LM9820
20 Pin Wide SOIC
20 Pin Wide SOIC, Tape & Reel
20 Pin Wide SOIC
20 Pin Wide SOIC, Tape & Reel
&
1
Features
Key Specifications
6 million pixels/s conversion rate
Digitally programmed gain and offset for red, green and blue
Correlated Double Sampling for lowest noise
TTL/CMOS input/output compatible
Output Data Resolution
Pixel Conversion Rate
Supply Voltage
Power Dissipation
pixels
20
19
18
17
16
15
14
13
12
11
Package
DGND
VD
MCLK
D5
D4
D3
D2 (SCLK)
D1 (Latch)
D0 (SDI)
NewLine
http://www.national.com
July 1998
10/12 Bits
300mW
5V±5%
6MHz

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lm9820ccwmx Summary of contents

Page 1

... Connection Diagrams V RefBypass SampCLK Ordering Information Commercial (0°C LM9810CCWM LM9810CCWMX LM9820CCWM LM9820CCWMX TRI-STATE® registered trademark of National Semiconductor Corporation. ©1997,1998 National Semiconductor Corporation Features • 6 million pixels/s conversion rate • Digitally programmed gain and offset for red, green and blue pixels • ...

Page 2

Block Diagram Sampler Mux REF+ or Select V V REF- signal V reference SampCLK NewLine MCLK SampCLK ADC Clock PGA V SIG x3 Boost .93 ...

Page 3

Absolute Maximum Ratings + Positive Supply Voltage ( With Respect to GND= = AGND DGND Voltage On Any Input or Output Pin Input Current at any pin (Note 3) Package Input Current (Note 3) Package ...

Page 4

LM9810 Electrical Characteristics The following specifications apply for = AGND all other limits T =T =25°C . All LSB limits are in units of the LM9810’s 10 bit ADC. (Notes 7, 8, & 12) ...

Page 5

LM9820 Electrical Characteristics The following specifications apply for = AGND all other limits T =T =25°C . All LSB limits are in units of the LM9820’s 12 bit ADC. (Notes 7, 8, & 12) ...

Page 6

AC Electrical Characteristics The following specifications apply for AGND limits apply for all other limits MIN MAX Symbol Parameter f Maximum Frequency MCLK MCLK Duty Cycle MCLK t period MCLK MCLK ...

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AGND Note 7: Two diodes clamp the OS analog inputs to impedance of the sensor, prevents damage to the LM9810/20 from transients during power-up. Note 8: To guarantee accuracy required that VA and VD be connected together to ...

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Pin Descriptions Analog Power VA This is the positive supply pin for the analog supply. It should be connected to a voltage source of +5V and bypassed to 0.1µF monolithic capacitor in parallel with a 10µF tantalum capacitor. AGND This ...

Page 9

Timing Diagrams Diagram 1: Pixel Conversion Timing and Latency Diagram 2: Diagram 3: Timing for Programming the Configuration Registers and Output Data Timing ( SampCLK NewLine 9 low) http://www.national.com ...

Page 10

Timing Diagrams NewLine RS O ptic al B lack P ixel OS Clamp Signal (Internal) Clamp On SampCLK Ø1 (Even/Odd Mode) Ø2 (Even/Odd Mode) Ø1 (Standard Mode) Ø2 (Standard Mode) CCD Reset signal OS SampCLK O ptica l B lack ...

Page 11

Table 1: Configuration Register Address Table Address Address (Decimal) (Binary Data Bits B5 ...

Page 12

Table 2: Configuration Register Parameters Parameter (Address) B5 CDS Enable 0 ( Signal Polarity 0 ( Color Mode ( ...

Page 13

Table 2: Configuration Register Parameters Parameter (Address) Red, Green and Blue Offset DAC Settings (1, 2 & Offset Polarity 0 (1,2 & Offset Value B4(MSB) B3 (1,2 & (SIGN) (MSB ...

Page 14

Table 2: Configuration Register Parameters Parameter (Address) Production Test and Power Down (7) Production Test B4 B5 (7) Power Down B0 Enable 0 (7) 1 (Continued) Control Bits Should all be set to zero for normal operation ...

Page 15

Applications Information 1.0 Programming the LM9810/20 1.1 Writing to the Configuration Register When is high, , & act as a serial interface for writ- NewLine ing to the configuration registers. is the input serial clock D2 (SCLK), ...

Page 16

R offset and gain settings will be used for the first conversion following a falling edge on NewLine set to Single Input Color (001). For the Single Input Color, Bayer and Green Stripe modes, the mux will always ...

Page 17

OUT IN B DAC Equation 6: Simplified output code calculation 1.8 Power Down Mode Setting the Power Down (bit B0 of register 7) puts the device in a low power standby mode. The ...

Page 18

If there are 2700 active pixels on a line then: 4p(F)(V) --------------------- - 2700 C = CLAMP MIN 2mV = 5.4uF Equation 12: CIS mode C Calculation Example CLAMP MIN 2.1.3 Maximum Clamp Capacitor Calculation: The maximum size ...

Page 19

SampCLK MCLK synchronize the applied signal. The internal ADC clock SampCLK will go low after the falling edge of SampCLK of . The ADC clock will stay low for two MCLK then go high. ...

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Physical Dimensions inches (millimeters) 20 pin (.300” Wide) Molded Small Outline Package 20 http://www.national.com ...

Page 21

LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems ...

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