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參數資料
| 型號： | AD9995 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit CCD Signal Processor with Precision Timing ⑩ Generator |
| 中文描述： | 12位CCD信號處理器與精密計時⑩發生器 |
| 文件頁數： | 33/60頁 |
| 文件大小： | 1593K |
| 代理商： | AD9995 |
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AD9995
–33–
t
PWR
2
1
3
4
5
6
7
8
9
10
11
12
t
SYNC
1V
1ST FIELD
1H
CLOCKS ACTIVE WHEN OUT CONTROL
REGISTER IS UPDATED AT VD/HD EDGE
H2/H4
H1/H3, RG, DCLK
DIGITAL
OUTPUTS
HD
(OUTPUT)
VD
(OUTPUT)
SYNC
(INPUT)
SERIAL
WRITES
CLI
(INPUT)
VDD
(INPUT)
Figure 35. Recommended Power-Up Sequence and Synchronization, Master Mode
POWER-UP AND SYNCHRONIZATION
Recommended Power-Up Sequence for Master Mode
When the AD9995 is powered up, the following sequence is
recommended (refer to Figure 35 for each step). Note that a
SYNC signal is required for Master mode operation. If an exter-
nal SYNC pulse is not available, it is also possible generate an
internal SYNC pulse by writing to the SYNCPOL register, as
described in the next section.
1. Turn on power supplies for AD9995.
2. Apply the master clock input CLI.
3. Reset the internal AD9995 registers by writing a 1 to the
SW_RESET register (Addr. 0x10 in Bank 1).
4. By default, the AD9995 is in Standby3 mode. To place the
part into normal power operation, write 0x004 to the AFE
OPRMODE register (Addr. 0x00 in Bank 1).
5. Write a 1 to the BANKSELECT register (Addr. 0x7F).
This will select Register Bank 2.
6. Load Bank 2 registers with the required VPAT group,
V-sequence, and field timing information.
7. Write a 0 to the BANKSELECT register to select Bank 1.
8. By default, the internal timing core is held in a reset state
with TGCORE_RSTB register = 0. Write a 1 to the TG-
CORE_RSTB register (Addr. 0x15 in Bank 1) to start the
internal timing core operation.
9. Load the required registers to configure the high speed tim-
ing, horizontal timing, and shutter timing information.
10. Configure the AD9995 for Master mode timing by writing a
1 to the MASTER register (Addr. 0x20 in Bank 1).
11. Write a 1 to the OUT_CONTROL register (Addr. 0x11 in
Bank 1). This will allow the outputs to become active after
the next SYNC rising edge.
12. Generate a SYNC event: If SYNC is high at power-up,
bring the SYNC input low for a minimum of 100 ns.
Then bring SYNC back high. This will cause the internal
counters to reset and will start VD/HD operation. The first
VD/HD edge allows most Bank 1 register updates to occur,
including OUT_CONTROL to enable all outputs.
Table XIII. Power-Up Register Write Sequence
Address Data Description
0x10 0x01 Reset All Registers to Default Values
0x00 0x04 Power Up the AFE and CLO Oscillator
0x7F 0x01 Select Register Bank 2
0x00–0xFF VPAT, V-Sequence, and Field Timing
0x7F 0x00 Select Register Bank 1
0x15 0x01 Reset Internal Timing Core
0x30–71 Horizontal and Shutter Timing
0x20 0x01 Configure for Master Mode
0x11 0x01 Enable All Outputs after SYNC
0x13 0x01 SYNCPOL (for Software SYNC Only)
Generating Software SYNC without External SYNC Signal
If an external SYNC pulse is not available, it is possible to
generate an internal SYNC in the AD9995 by writing to the
SYNCPOL register (Addr. 0x13). If the software SYNC option is
used, the SYNC input (Pin 46) should be tied to ground (VSS).
After power-up, follow the same procedure as before for Steps
1 to 11. Then, for Step 12, instead of using the external SYNC
pulse, write a 1 to the SYNCPOL register. This will generate the
SYNC internally, and timing operation will begin.
REV. 0
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