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參數(shù)資料
| 型號： | AD7244JN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs |
| 中文描述： | DUAL, SERIAL INPUT LOADING, 2 us SETTLING TIME, 14-BIT DAC, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-24 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 319K |
| 代理商： | AD7244JN |
AD7242/AD7244
REV. A
–9–
MICROPROCESSOR INTERFACING
Microprocessor interfacing to the AD7242/AD7244 is via a
serial bus that uses standard protocol compatible with DSP
processors and microcontrollers. The communication interface
consists of a separate transmit section for each of the DACs.
Each section has a clock signal, a data signal and a frame or
strobe pulse.
Figures 7 through 11 show the AD7242/AD7244 configured
for interfacing to a number of popular DSP processors and
microcontrollers.
AD7242/AD7244 to ADSP-2101/ADSP-2102 Interface
Figure 7 shows a serial interface between the AD7242/AD7244
and the ADSP-2101/ADSP-2102 DSP processor. The ADSP-
2101/ADSP-2102 has two serial ports and, in the interface
shown, both serial ports are used, one for each DAC. Both serial
ports do not have to be used; in the case where only one serial
port is used, an extra line (DACA/
DACB
as shown in the other
serial interfaces) would have to decode the one
TFS
line to
provide
TFSA
and
TFSB
lines for the AD7242/AD7244.
Figure 7. AD7242/AD7244 to ADSP-2101/ADSP-2102
Interface
The three serial lines of the first serial port, SPORT1, of the
ADSP-2101/ADSP-2102 connect directly to the three serial
input lines of DACA of the AD7242/AD7244. The three serial
lines of SPORT2 connect directly to the three serial lines on the
DACB serial input port. Data from the ADSP-2101/ADSP-2102 is
valid on the falling edge of SCLK. A common LDAC signal is
used to drive the
LDACA
and
LDACB
inputs. This is shown to
be generated from a timer or clock recovery circuit but another
control or address line of the ADSP-2101/ADSP-2102 could be
used to drive these inputs. Alternatively, the
LDACA
and
LDACB
inputs of the AD7242/AD7244 could be hardwired
low; in this case the update of the DAC latches and analog
outputs takes place on the 16th falling edge of SCLK (after the
respective
TFS
signal goes low).
AD7242/AD7244 to DSP56000 Interface
A serial interface between the AD7242/AD7244 and the
DSP56000 is shown in Figure 8. The DSP56000 is configured
for normal mode, asynchronous operation with gated clock. It is
also set up for a 16-bit word with SCK and SC2 as outputs and
the FSL control bit set to a 0. SCK is internally generated on
the DSP56000 and applied to both the TCLKA and TCLKB
inputs of the AD7242/AD7244. Data from the DSP56000 is
valid on the falling edge of SCK. The serial data line, STD
drives the DTA and DTB serial input data lines of the
AD7242/AD7244.
The SC2 output provides the framing pulse for valid data. This
is an active high output and is gated with a DACA/
DACB
control line before being applied to the
TFSA
and
TFSB
inputs
of the AD7242/AD7244. The DACA/
DACB
line determines
which DAC serial data is to be transferred to, i.e., which
TFS
line is active when SC2 is active.
As in the previous interface, a common
LDAC
input is shown
driving the
LDACA
and
LDACB
inputs of the AD7242/AD7244.
Once again, these
LDAC
inputs could be hardwired low, in
which case V
OUTA
or V
OUTB
will be updated on the sixteenth
falling edge of SCK after the
TFSA
or
TFSB
input goes low.
Figure 8. AD7242/AD7244 to DSP56000 Interface
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD7244JNZ | 功能描述:IC DAC 14BIT SERIAL W/REF 24DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 設(shè)置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD7244JR | 功能描述:IC DAC 14BIT LC2MOS DUAL 28SOIC RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1,000 系列:- 設(shè)置時間:1µs 位數(shù):8 數(shù)據(jù)接口:串行 轉(zhuǎn)換器數(shù)目:8 電壓電源:雙 ± 功率耗散（最大）:941mW 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC W 包裝:帶卷 (TR) 輸出數(shù)目和類型:8 電壓，單極 采樣率（每秒）:* |
| AD7244JR-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| AD7244JRZ | 功能描述:IC DAC 14BIT LC2MOS DUAL 28SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 設(shè)置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD7244JRZ | 制造商:Analog Devices 功能描述:D/A Converter (D-A) IC |
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