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參數資料
| 型號： | AD9864BCPZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | IF Digitizing Subsystem |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC48 |
| 封裝： | LEAD FREE, MO-220VKKD-2, LFCSP-48 |
| 文件頁數： | 17/44頁 |
| 文件大小： | 1984K |
| 代理商： | AD9864BCPZRL |
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AD9864
THEORY OF OPERATION
SERIAL PORT INTERFACE (SPI)
The serial port of the AD9864 has 3-wire or 4-wire SPI capabil-
ity, allowing read/write access to all registers that configure the
device’s internal parameters. The default 3-wire serial commu-
nication port consists of a clock (PC), peripheral enable (PE),
and bidirectional data (PD) signal. The inputs to PC, PE, and
PD contain a Schmitt trigger with a nominal hysteresis of 0.4 V
centered about the digital interface supply, i.e., VDDH/2.
A 4-wire SPI interface can be enabled by setting the MSB of the
SSICRB register (Reg. 0x19, Bit 7) and setting Reg. 0x3A to 00,
resulting in the output data appearing on the DOUTB pin.
Note that since the default power-up state sets DOUTB low,
bus contention is possible for systems sharing the SPI output
line. To avoid any bus contention, the DOUTB pin can be
three-stated by setting the fourth control bit in the three-state
bit (Reg. 0x3B, Bit 3). This bit can then be toggled to gain access
to the shared SPI output line. An 8-bit instruction header must
accompany each read and write SPI operation. Only the write
operation supports an auto-increment mode, which allows the
entire chip to be configured in a single write operation. The
instruction header is shown in Table 7. It includes a read/not-
write indicator bit, six address bits, and a Don’t Care bit. The
data bits immediately follow the instruction header for both
read and write operations. Note that the address and data are
always given MSB first.
Table 7. Instruction Header Information
MSB
I7
I6
I5
I4
R/W
A5
A4
A3
Rev. 0 | Page 17 of 44
I3
A2
I2
A1
I1
A0
LSB
I0
X
Figure 29 illustrates the timing requirements for a write opera-
tion to the SPI port. After the peripheral enable (PE) signal goes
low, data (PD) pertaining to the instruction header is read on
the rising edges of the clock (PC). To initiate a write operation,
the read/not-write bit is set low. After the instruction header is
read, the eight data bits pertaining to the specified register are
shifted into the data pin (PD) on the rising edges of the next
eight clock cycles. PE stays low during the operation and goes
high at the end of the transfer. If PE rises before the eight clock
cycles have passed, the operation is aborted. If PE stays low for
an additional eight clock cycles, the destination address is
incremented and another eight bits of data are shifted in.
Again, should PE rise early, the current byte is ignored. By
using this implicit addressing mode, the chip can be configured
with a single write operation. Registers identified as being sub-
ject to frequent updates, namely those associated with power
control and AGC operation, have been assigned adjacent
addresses to minimize the time required to update them. Note
that multibyte registers are big endian (the most significant
byte has the lower address) and are updated when a write to the
least significant byte occurs.
Figure 30 illustrates the timing for a read operation to the SPI
port. Although the AD9864 does not require read access for
proper operation, it is often useful in the product development
phase or for system authentication. Note that the read-back
enable bit (Register 0x3A, Bit 3) must be set for a read opera-
tion with a 3-wire SPI interface. After the peripheral enable
(PE) signal goes low, data (PD) pertaining to the instruction
header is read on the rising edges of the clock (PC). A read
operation occurs if the read/not-write indicator is set high.
After the address bits of the instruction header are read, the
eight data bits pertaining to the specified register are shifted out
of the data pin (PD) on the falling edges of the next eight clock
cycles. If the 4-wire SPI interface is enabled, the eight data bits
will also appear on the DOUTB pin with the same timing rela-
tionship as those appearing at PD. After the last data bit is
shifted out, the user should return PE high, causing PD to
become three-stated and return to its normal status as an input
pin. Since the auto-increment mode is not supported for read
operations, an instruction header is required for each register
read operation and PE must return high before initiating the
next read operation.
PE
PC
PD
t
H
t
DS
t
HI
t
S
t
DH
t
LOW
t
CLK
R/W
A5
A4
A0
D7
D6
D1
D0
DON'T
CARE
0
Figure 29.
SPI Write Operation Timing
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