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參數(shù)資料
| 型號： | AD9957BSVZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 42/64頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DDS 1GSPS 14BIT IQ 100TQFP |
| 產(chǎn)品培訓(xùn)模塊： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 分辨率（位）： | 14 b |
| 主 fclk： | 1GHz |
| 調(diào)節(jié)字寬（位）： | 32 b |
| 電源電壓： | 1.8V, 3.3V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-TQFP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 100-TQFP-EP（14x14） |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 552 (CN2011-ZH PDF) |
| 配用： | AD9957/PCBZ-ND - BOARD EVAL AD9957 QUADRATURE MOD |
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Data Sheet
AD9957
Rev. C | Page 47 of 64
SERIAL PROGRAMMING
CONTROL INTERFACE—SERIAL I/O
The AD9957 serial port is a flexible, synchronous serial commu-
nications port allowing easy interface to many industry-standard
microcontrollers and microprocessors.
The interface allows read/write access to all registers that configure
the AD9957. MSB-first or LSB-first transfer formats are sup-
ported. In addition, the serial interface port can be configured
as a single pin input/output (SDIO) allowing a two-wire interface,
or it can be configured as two unidirectional pins for input/output
(SDIO/SDO), enabling a 3-wire interface. Two optional pins
(I/O_RESET and CS) enable greater flexibility for designing
systems with the AD9957.
GENERAL SERIAL I/O OPERATION
There are two phases to a serial communications cycle. The first
is the instruction phase to write the instruction byte into the
AD9957. The instruction byte contains the address of the regis-
ter to be accessed (see the Register Map and Bit Descriptions
section) and defines whether the upcoming data transfer is a
write or read operation.
For a write cycle, Phase 2 represents the data transfer between
the serial port controller to the serial port buffer. The number
of bytes transferred is a function of the register being accessed.
For example, when accessing the Control Function Register 2
(Address 0x01), Phase 2 requires that four bytes be transferred.
Each bit of data is registered on each corresponding rising edge
of SCLK. The serial port controller expects that all bytes of the
register be accessed; otherwise, the serial port controller is put
out of sequence for the next communication cycle. However,
one way to write fewer bytes than required is to use the I/O_RESET
pin feature. The I/O_RESET pin function can be used to abort
an I/O operation and reset the pointer of the serial port con-
troller. After an I/O reset, the next byte is the instruction byte.
Note that every completed byte written prior to an I/O reset is
preserved in the serial port buffer. Partial bytes written are not
preserved. At the completion of any communication cycle, the
AD9957 serial port controller expects the next eight rising
SCLK edges to be the instruction byte for the next communi-
cation cycle.
After a write cycle, the programmed data resides in the serial
port buffer and is inactive. I/O_UPDATE transfers data from
the serial port buffer to active registers. The I/O update can
either be sent after each communication cycle or when all serial
operations are complete. In addition, a change in profile pins
can initiate an I/O update.
For a read cycle, Phase 2 is the same as the write cycle with the
following differences: Data is read from the active registers, not
the serial port buffer, and data is driven out on the falling edge
of SCLK.
Note that to read back any profile register (0x0E to 0x15), the
three external profile pins must be used. For example, if the
profile register is Profile 5 (0x13) then PROFILE<0:2> pins
must equal 101.This is not required to write to profile registers.
INSTRUCTION BYTE
The instruction byte contains the following information as
shown in the instruction byte bit map.
Instruction Byte Information Bit Map
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
R/W
X
A4
A3
A2
A1
A0
R/W—Bit 7 of the instruction byte determines whether a read
or write data transfer occurs after the instruction byte write.
Logic 1 indicates a read operation. Cleared indicates a write
operation.
X, X—Bit 6 and Bit 5 of the instruction byte are don’t cares.
A4, A3, A2, A1, A0—Bit 4, Bit 3, Bit 2, Bit 1, and Bit 0 of the
instruction byte determine which register is accessed during the
data transfer portion of the communications cycle.
SERIAL I/O PORT PIN DESCRIPTIONS
SCLK—Serial Clock
The serial clock pin is used to synchronize data to and from the
AD9957 and to run the internal state machines.
CS—Chip Select Bar
An active low input that allows more than one device on the
same serial communications line. The SDO and SDIO pins go
to a high impedance state when this input is high. If driven high
during any communications cycle, that cycle is suspended until
CS is reactivated low. Chip select (CS) can be tied low in
systems that maintain control of SCLK.
SDIO—Serial Data Input/Output
Data is always written into the AD9957 on this pin. However,
this pin can be used as a bidirectional data line. Bit 1 of CFR1,
Register Address 0x00, controls the configuration of this pin.
The default is cleared, which configures the SDIO pin as
bidirectional.
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| AD9957BSVZ-REEL | 功能描述:IC DDS 1GSPS 14BIT IQ 100TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數(shù)字合成 (DDS) 系列:- 產(chǎn)品變化通告:Product Discontinuance 27/Oct/2011 標(biāo)準(zhǔn)包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調(diào)節(jié)字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9957BSVZREEL13 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1 GSPS Quadrature Digital Upconverter w/18-Bit IQ Data Path and 14-Bit DAC |
| AD9958 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2-Channel 500 MSPS DDS with 10-Bit DACs |
| AD9958 PCB | 制造商:Analog Devices 功能描述:EVAL BOARD ((NS)) |
| AD9958/PCB | 制造商:Analog Devices 功能描述:Evaluation Board For 2-Channel 500 MSPS DDS With 10-Bit DACs 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述:IC 10-BIT DAC DDS |
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