參數資料
型號： AD7939BSU
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
中文描述： 8-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PQFP32
封裝： PLASTIC, MS-026-ABA, TQFP-32
文件頁數： 27/32頁
文件大?。?/td> 1332K
代理商： AD7939BSU
Preliminary Technical Data
AD7938/AD7939
Writing Data to the AD7938/AD7939
With W/B tied logic high, a single write operation transfers the
full data-word on DB0 to DB11 to the control register on the
AD7938/AD7939. The DB8/HBEN pin assumes its DB8
function. Data written to the AD7938/AD7939 should be
provided on the DB0 to DB11 inputs with DB0 being the LSB of
the data-word. With W/B tied logic low, the AD7938/AD7939
requires two write operations to transfer a full 12-bit word.
DB8/HBEN assumes its HBEN function. Data written to the
AD7938/AD7939 should be provided on the DB0 to DB7
inputs. HBEN determines whether the byte written is high byte
or low byte data. The low byte of the data-word should be
written first with DB0 being the LSB of the full data-word. For
the high byte write, HBEN should be high and the data on the
DB0 input should be data bit 8 of the 12-bit word. In both word
and byte mode, a single write operation to the shadow register is
always sufficient since it is only 8-bits wide.
Figure 40
Figure 40. AD7938/AD7939 Parallel Interface—Write Cycle Timing for Word Mode Operation (W/B = 1)
shows the write cycle timing diagram of the
AD7938/AD7939. When operated in word mode, the HBEN
input does not exist and only the one write operation is required
to write the word of data to the device. Data should be provided
on DB0 to DB11. When operated in byte mode, the two write
cycles shown in F
are required to write the full data-
word to the AD7938/AD7939. In F
transfers the lower 8 bits of the data-word from DB0 to DB7,
and the second write transfers the upper 4 bits of the data-word.
When writing to the AD7938/AD7939, the top 4 bits in the high
byte must be 0s.
, the first write
igure 41
igure 41
Figure 41. AD7938/AD7939 Parallel Interface—Write Cycle Timing for Byte Mode Operation (W/B = 0)
The data is latched into the device on the rising edge of WR.
The data needs to be setup a time, t
7
, before the WR rising edge
and held for a time, t
8
, after the WR rising edge. The CS and WR
signals are gated internally. CS and WR may be tied together as
the timing specifications for t
4
and t
5
are 0 ns minimum
(assuming CS and RD have not already been tied together).
t
8
t
5
t
7
t
6
t
4
DATA
DB0 TO DB11
WR
CS
0
t
5
t
4
t
7
t
18
t
18
t
19
t
19
t
8
t
6
t
17
LOW BYTE
HIGH BYTE
DB0 TO DB11
HBEN/DB8
WR
CS
0
Rev. PrN | Page 27 of 32
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相關代理商/技術參數
參數描述
AD7939BSU-REEL 制造商:Analog Devices 功能描述:
AD7939BSU-REEL7 制造商:Analog Devices 功能描述:
AD7939BSUZ 功能描述:IC ADC 10BIT 8CH PARALL 32TQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數:12 采樣率（每秒）:20M 數據接口:并聯 轉換器數目:2 功率耗散（最大）:155mW 電壓電源:模擬和數字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數目和類型:4 個單端，單極；2 個差分，單極 產品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
AD7939BSUZ-REEL7 功能描述:IC ADC 10BIT 8CH PARALL 32TQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極
AD7940 制造商:AD 制造商全稱:Analog Devices 功能描述:3mW, 100kSPS, 14-Bit ADC in 6-Lead SOT-23
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