AD9995KCP Analog Devices Inc, AD9995KCP Datasheet - Page 37

• Manufacturer Part Number: AD9995KCP
• Description: IC CCD SIGNAL PROCESSOR 56-LFCSP
• Manufacturer: Analog Devices Inc
• Type: CCD Signal Processor, 12-Bitr

Specifications of AD9995KCP

• Rohs Status: RoHS non-compliant
• Input Type: Logic
• Output Type: Logic
• Interface: 3-Wire Serial
• Current - Supply: 30mA
• Mounting Type: Surface Mount
• Package / Case: 56-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: 12b
• 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: 56
• Package Type: LFCSP EP
• Number Of Channels: 1
• Lead Free Status / RoHS Status: Not Compliant

SERIAL INTERFACE TIMING
All of the internal registers of the AD9995 are accessed through
a 3-wire serial interface. Each register consists of an 8-bit address
and a 24-bit data-word. Both the 8-bit address and 24-bit data-
word are written starting with the LSB. To write to each register,
a 32-bit operation is required, as shown in Figure 40a. Although
many registers are fewer than 24 bits wide, all 24 bits must be
written for each register. For example, if the register is only
10 bits wide, the upper 14 bits are don’t cares and may be filled
with 0s during the serial write operation. If fewer than 24 bits are
written, the register will not be updated with new data.
REV. 0
SDATA
SCK
SL
SDATA
SCK
NOTES
1. MULTIPLE SEQUENTIAL REGISTERS MAY BE LOADED CONTINUOUSLY.
2. THE FIRST (LOWEST ADDRESS) REGISTER ADDRESS IS WRITTEN, FOLLOWED BY MULTIPLE 24-BIT DATA-WORDS.
3. THE ADDRESS WILL AUTOMATICALLY INCREMENT WITH EACH 24-BIT DATA-WORD (ALL 24 BITS MUST BE WRITTEN).
4. SL IS HELD LOW UNTIL THE LAST DESIRED REGISTER HAS BEEN LOADED.
SL
A0
1
NOTES
1. SDATA BITS ARE LATCHED ON SCK RISING EDGES. SCK MAY IDLE HIGH OR LOW IN BETWEEN WRITE OPERATIONS.
2. ALL 32 BITS MUST BE WRITTEN: 8 BITS FOR ADDRESS AND 24 BITS FOR DATA.
3. IF THE REGISTER LENGTH IS <24 BITS, “DON’T CARE” BITS MUST BE USED TO COMPLETE THE 24-BIT DATA LENGTH.
4. NEW DATA VALUES ARE UPDATED IN THE SPECIFIED REGISTER LOCATION AT DIFFERENT TIMES, DEPENDING ON THE
PARTICULAR REGISTER WRITTEN TO. SEE THE REGISTER UPDATES SECTION FOR MORE INFORMATION.
A1
A0
2
1
t
A2
DS
A1
t
LS
3
2
A3
A2
4
8-BIT ADDRESS
3
A4
A3
5
4
A5
Figure 40b. Continuous Serial Write Operation
t
DH
A4
6
5
A6
A5
7
Figure 40a. Serial Write Operation
6
A7
A6
8
7
D0
A7
9
8
DATA FOR STARTING
REGISTER ADDRESS
D1
D0
10
9
–37–
D1
...
...
...
10
D2
Figure 40b shows a more efficient way to write to the registers,
using the AD9995’s address auto-increment capability. Using
this method, the lowest desired address is written first, followed
by multiple 24-bit data-words. Each new 24-bit data-word will
automatically be written to the next highest register address. By
eliminating the need to write each 8-bit address, faster register
loading is achieved. Continuous write operations may be used
starting with any register location, and may be used to write to as
few as two registers, or as many as the entire register space.
11
D22
D3
31
24-BIT DATA
12
D23
32
...
...
...
D0
33
D1
D21
REGISTER ADDRESS
34
DATA FOR NEXT
30
D22 D23
t
...
...
...
LH
31
32
D22 D23
55
56
D0
57
D1
58
AD9995
D2
59
...
...
...