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參數(shù)資料
| 型號： | AD7859 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADCs(單電源,200kSPS 8通道12位采樣A/D轉(zhuǎn)換器) |
| 中文描述： | 3 V至5 V單電源，200 kSPS的8通道，12位采樣ADC（單電源，速度高達200ksps的8通道12位采樣的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 555K |
| 代理商： | AD7859 |
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AD7859/AD7859L
REV. A
–24–
DATA
VALID
DATA
VALID
t
16
t
15
t
17
t
14
t
13
t
CONVERT
t
1
t
18
t
5
t
6
t
7
t
8
t
9
*
W/
B
PIN LOGIC HIGH
BUSY
CS
WR
DB0 – DB15
CONVST
RD
INTERNAL
DATA
LATCH
OLD DATA
NEW DATA
Figure 35. Read and Write Cycle Timing Diagram for 16-Bit Transfers
Figure 35 shows the read cycle timing diagram for 16-bit trans-
fers for the AD7859. When operated in word mode, the HBEN
input does not exist, and only the first read operation is required
to access data from the AD7859. Valid data, in this case, is pro-
vided on DB0–DB15. When operated in byte mode, the two
read cycles shown in Figure 36 are required to access the full data
word from the AD7859. Note that in byte mode, the order of
successive read operations is important when reading the cali-
bration registers. This is because the register file address pointer
is incremented on a high byte read as explained in the calibra-
tion register section of this data sheet. In this case the order of
the read should always be Low Byte–High Byte. In Figure 36,
the first read places the lower 8 bits of the full data word on
DB0–DB7 and the second read places the upper 8 bits of the
data word on DB0–DB7.
The
CS
and
RD
signals are gated internally and level-triggered
active low. In either word or byte mode,
CS
and
RD
may be
tied together as the timing specification for t
5
and t
6
is 0 ns min.
The data is output a time t
8
after both
CS
and
RD
go low. The
RD
rising should be used to latch data by the user and after a
time t
9
the data lines will become three-stated.
PARALLEL INTERFACE
The AD7859 provides a flexible, high speed, parallel interface.
This interface is capable of operating in either word (with the
W/
B
pin tied high) or byte (with W/
B
tied low) mode. A detailed
description of the different interface arrangements follows.
Reading
With the W/
B
pin at a logic high, the AD7859 interface operates
in word mode. In this case, a single read operation from the
device accesses the word on pins DB0 to DB15 (for a data read,
the 12-bit conversion result appears on DB0–DB11). DB0 is
the LSB of the word. The DB8/HBEN pin assumes its DB8
function. With the W/
B
pin at a logic low, the AD7859 interface
operates in byte mode. In this case, the DB8/HBEN pin as-
sumes its HBEN function. Data to be accessed from the
AD7859 must be accessed in two read operations with 8 bits of
data provided by the AD7859 on DB0–DB7 for each of the
read operations. The HBEN pin determines whether the read
operation accesses the high byte or low byte of the 16-bit word.
For a low byte read, DB0 provides the LSB of the 16-bit word.
For a high byte read DB0 provides data bit 8 of the 16-bit word
with DB7 providing the MSB of the 16-bit word.
t
3
t
4
t
3
t
4
t
5
t
10
t
6
t
7
t
8
t
9
LOW BYTE
HIGH BYTE
*
W/
B
PIN LOGIC LOW
HBEN
CS
RD
DB0 – DB7
Figure 36. Read Cycle Timing for Byte Mode Operation
相關PDF資料 |
PDF描述 |
|---|---|
| AD7861AP | 11-Bit Resolution Simultaneous Sampling A/D Converter |
| AD7861 | 11-Bit Resolution Simultaneous Sampling A/D Converter(同時采樣11位A/D轉(zhuǎn)換器) |
| AD7862 | Simultaneous Sampling Dual 250 kSPS 12-Bit ADC(同時采樣250kSPS 12位雙A/D轉(zhuǎn)換器) |
| AD7863 | Simultaneous Sampling Dual 175 kSPS 14-Bit ADC(同時采樣175kSPS14位雙A/D轉(zhuǎn)換器) |
| AD7864 | Four Channel, Simultaneous Sampling, High Speed, 12-Bit ADC(四通道,同時采樣高速12位A/D轉(zhuǎn)換器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD7859AP | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Parallel 44-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:12-BIT,8 CHANNEL,SERIAL 200 KSPS I.C. - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
| AD7859AP-REEL | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Parallel 44-Pin PLCC T/R 制造商:Rochester Electronics LLC 功能描述:12-BIT,8 CHANNEL,SERIAL 200 KSPS I.C. - Tape and Reel |
| AD7859APZ | 功能描述:IC ADC 12BIT 8CH 200KSPS 44PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 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） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7859APZ-REEL | 功能描述:IC ADC 12BIT 8CHAN LP 44PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 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） 供應商設備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類型:1 個單端，單極；1 個單端，雙極 |
| AD7859AS | 制造商:Analog Devices 功能描述:ADC Single SAR 200ksps 12-bit Parallel 44-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:12-BIT 8 CH.SERIAL 200 KSPS I.C. - Bulk 制造商:Analog Devices 功能描述:IC 12-BIT ADC |
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