AD9898KCP-20 Analog Devices Inc, AD9898KCP-20 Datasheet - Page 37

• Manufacturer Part Number: AD9898KCP-20
• Description: IC CCD SIGNAL PROC/GEN 48-LFCSP
• Manufacturer: Analog Devices Inc
• Type: CCD Signal Processor, 10-Bitr

Specifications of AD9898KCP-20

• Rohs Status: RoHS non-compliant
• Input Type: Logic
• Output Type: Logic
• Interface: 3-Wire Serial
• Mounting Type: Surface Mount
• Package / Case: 48-LFCSP
• Analog Front End Type: CCD
• Analog Front End Category: Video
• Interface Type: Serial (3-Wire)
• Input Voltage Range: 0.5V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (typ): 3V
• Operating Supply Voltage (max): 3.6V
• Resolution: 10b
• Number Of Adc's: 1
• Power Supply Type: Analog/Digital
• Operating Temp Range: -20C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LFCSP EP
• Number Of Channels: 3
• Current - Supply: -
• Lead Free Status / RoHS Status: Not Compliant

Register Name
SUBCKNUM
SUBCKSUPPRESS 1
SUBCK_EN
SUBCKMODE_HP 1
SUBCKNUM_HP
SUBCK1TOG1
SUBCK1TOG2
SUBCK2TOG1
SUBCK2TOG2
SUBCKSEL
ELECTRONIC SHUTTER TIMING CONTROL
CCD image exposure time is controlled through the use of the
CCD substrate clock signal (SUBCK), which pulses the CCD
substrate to clear out accumulated charge prior to the exposure
period. The AD9898 supports three types of electronic shutter-
ing: normal shutter mode, suppression shutter mode, and high
speed shutter mode. Table XXI contains the registers required
for programming SUBCK pulses for each of these modes.
Normal Shutter Mode
Figure 37 shows the VD and SUBCK output for normal shutter
mode. The SUBCK will pulse once per line. The number of
SUBCK pulses per field can be programmed by setting register
SUBCKNUM (Addr 0x0B). As shown in Figure 37, the SUBCK
pulses will always begin on the line after the sensor gate occurs,
specified by VSGACTLINE (Mode_Reg(1)).
SUBCK Suppression Mode
Normally the SUBCKs will begin to pulse on the line following
the last sensor gate line (VSG). With some CCDs, the first
SUBCK following the VSG line needs to be suppressed. The
SUBCKSUPPRESS register allows for this suppression. The
first SUBCK following the last VSG pulse is suppressed when
SUBCKSUPPRESS = 1, as shown in Figure 38.
High Precision Shutter Mode
The high speed shutter mode can be operated in two differ-
ent modes, single pulse and multiple pulse. These modes are
set up by programming the SUBCKNUM_HP register and
SUBCKMODE_HP register, as described in Table XXII and
shown in Figures 40 and 41.
Single Pulse Mode
In addition to the normal operating SUBCK pulse, one addi-
tional SUBCK pulse can be applied within the HD line while
REV. 0
Bit
Width Register Type
11
1
3
9
9
9
9
1
Control (Addr 0x01)
Control (Addr 0x0B)
Control (Addr 0x0B)
Control (Addr 0x0B)
Control (Addr 0x01)
System_Reg(14)
System_Reg(14)
System_Reg(15)
System_Reg(15)
Mode_Reg(2)
Table XXI. SUBCK Registers
Reference
Counter
OL-Counter 0–511 Pixel Location SUBCLK1 First Toggle Position
OL-Counter 0–511 Pixel Location SUBCLK1 Second Toggle Position
OL-Counter 0–511 Pixel Location SUBCLK2 First Toggle Position
OL-Counter 0–511 Pixel Location SUBCLK2 Second Toggle Position
–37–
operating in this mode. As shown in Figure 37, the location
of the additional SUBCK pulse is adjusted by setting the
SUBCKNUM_HP register as described in Table XXII. Finer
resolution of the exposure time is possible using this mode by
adding a SUBCK pulse in the line, as shown in Figure 40.
Multiple Pulse Mode
In addition to the normal operating SUBCK pulse, up to seven
sequential SUBCK pulses can be applied within the same line
while operating in this mode. As shown in Figure 41, the
number of additional SUBCK pulses is selectable by setting
SUBCKMODE_HP = 1 and the SUBCKNUM_HP registers
as described in Table XXII.
SUBCKNUM_HP
0–1 Pulse
Range
0–2047 Pulses
0–7 Pulses
0
1
2
3
4
5
6
7
Table XXII. Single and Multiple Pulse Mode
Single Pulse
Mode
Normal Shutter
Mode Operation Mode Operation
Position No. 1
Position No. 2
Position No. 3
Position No. 4
Position No. 5
Position No. 6
Position No. 7
Description
Number of SUBCK Pulses per Field
Suppress First SUBCK after Last VSG
Line Pulse
SUBCK Output Enable Control
(0 = Disable, 1 = Enable)
High Speed Shutter Mode Operation
High Speed Shutter SUBCLK
Position/Number
(0 = SUBCK1, 1 = SUBCK2)
0
SUBCKMODE_HP
Multiple Pulse
Mode
Normal Shutter
1 Additional Pulse
2 Additional Pulses
3 Additional Pulses
4 Additional Pulses
5 Additional Pulses
6 Additional Pulses
7 Additional Pulses
AD9898
1