XCM20014IBMN Freescale, XCM20014IBMN Datasheet - Page 10

• Manufacturer Part Number: XCM20014IBMN
• Manufacturer: Freescale
• Type: CMOSr

Specifications of XCM20014IBMN

• Sensor Image Color Type: Color
• Sensor Image Size Range: 250,920 to 480,000Pixels
• Sensor Image Size: 640x480Pixels
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 40C
• Package Type: CLCC
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / RoHS Status: Supplier Unconfirmed

MOTOROLA
10
2.2.3.2 Global Gain PGA
The global gain DPGA provides a 1.0x to 8.0x program-
mable gain adjustment for dynamic range. The gain of
the amplifier is linearly programmable using a six bit
gain coefficient in steps of 0.12x. The user programs the
global gain via the
16), on page
2.2.4 Global Digital Offset Voltage Adjust (DOVA)
A programmable global offset adjustment is available
on the MCM20014. A user defined offset value is loaded
via a 6-bit signed magnitude programming code via the
Global DOVA Register, (Table 20), on page
Offset correction allows fine-tuning of the signal to re-
move any additional residual error which may have ac-
cumulated in the analog signal path. This function is
performed directly before analog to digital conversion
and introduces a fixed gain of 2.0X. This feature is use-
ful in applications that need to insert a desired offset to
adjust for a known system noise floor relative to AVSS
and offsets of amplifiers in the analog chain.
2.2.5 Analog to Digital Converter (ADC)
The ADC is a fully differential, low power circuit. A pipe-
lined, Redundant Signed Digit (RSD) algorithmic tech-
nique is used to yield an ADC with superior
characteristics for imaging applications.
Integral Noise Linearity (INL) and Differential Noise Lin-
earity (DNL) performance is specified at +1.0 and +0.5,
respectively, with no missing codes. The input voltage
resolution is 2.44 mV with a full-scale 2.5 V
V
grammed via a Programmable Voltage Reference Gen-
erator. The positive reference voltage (VREFP) and
negative reference voltages (VREFM) can be pro-
grammed from 2.5V to 1.25V and 0V to 1.25V respec-
pp
/2
10
Figure 12. Color Gain Register Selection
). The input dynamic range of the ADC is pro-
25.
Green (0)
Green (3)
Blue (2)
Red (1)
DPGA Global Gain Register, (Table
G(0)
B(2)
6
6
6
6
R(1)
G(3)
Freescale Semiconductor, Inc.
6
For More Information On This Product,
0.9x-4.6x
DPGA
pp
Go to: www.freescale.com
28.
input (2.5
tively in steps of 5mV via the Reference Voltage
Registers
independently or in conjunction with the DPGAs to max-
imize the system dynamic range based on incident illu-
mination. The default input range for the ADC is 1.9V for
VREFP and 0.6V for VREFM hence allowing a 10 bit
digitization of a 1.3V peak to peak signal.
2.3 Digital Signal Post Processing
The post ADC functions provide means for manipulating
the 10-bit imager data. These functions are replacing
bad pixels and output signal companding.
2.3.1 Bad Pixel Replacement
This block conditionally monitors and replaces any de-
fective pixels on the imager. The user sets threshold
values for extreme black and extreme white to detect
bad pixels and independently enables/disables one or
both detections. Threshold values are input via the
White and Black Pixel Threshold Registers
and
selves are enabled via the
(Table 23), on page
The black threshold input sets the 8 LSBs of the mini-
mum detection level. The 2 MSBs are hard coded to 00
hence giving a range of 0-255 for setting the black
threshold levels. Any pixel value below the predefined
black threshold level is replaced. Similarly the white
threshold input sets the 8 LSBs of the maximum detec-
tion level. The 2 MSBs are hard coded to 11 allowing a
range white threshold level settings between 768 and
1023 code levels. Any pixels value above the defined-
white threshold level is replaced. The replacement val-
ue in either case is determined automatically by the
control bus. Based on the location of the pixel, a deci-
sion to replace the pixel value by the same color aver-
age, leading or trailing pixel value is made.
2.3.2 Data Compander
The Data Compander allows coring of the lower order
bits. In effect, it expands the values of lower signal lev-
els and compresses high light scenes thereby allowing
for on-chip contrast adjustments. The companding
function performs an 8-bit transformation on the in-com-
ing 10-bit data stream. The output is made available on
the upper 8 MSBs of the 10 bit output bus. The user can
select one of the 8 transformation curves shown in
ure 13
on page
is divided by four. For other choices, the I/O relationship
is kept 1:1 up to a certain breakpoint. There onwards a
straight line equation is used to transform the remaining
input values.
Table 22
via the
29. The bottom curve is linear in which the input
(Table 12
respectively) while the functions them-
Post ADC Control Register, (Table 23),
and
29.
Table
Post ADC Control Register,
13). This feature is used
(Table 21
MCM20014
Fig-