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參數資料
| 型號： | AD7677AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 1 LSB INL, 1 MSPS Differential ADC |
| 中文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PQFP48 |
| 封裝： | LQFP-48 |
| 文件頁數： | 15/20頁 |
| 文件大小： | 322K |
| 代理商： | AD7677AST |
REV. 0
AD7677
–15–
analog input has to be settled when BUSY goes low. Also, at
power-up,
CNVST
should be brought low once to initiate the
conversion process. In this mode, the AD7677 could sometimes
run slightly faster than the guaranteed limits in the impulse
mode of 666 kSPS. This feature does not exist in warp or
Normal modes.
CNVST
t
1
t
2
MODE
ACQUIRE
CONVERT
ACQUIRE
CONVERT
t
7
t
8
BUSY
t
4
t
3
t
5
t
6
Figure 11. Basic Conversion Timing
Although CNVST is a digital signal, it should be designed with
this special care with fast, clean edges and levels, with minimum
overshoot and undershoot or ringing.
For applications where the SNR is critical, the CNVST signal
should have a very low jitter. Some solutions to achieve that are to
use a dedicated oscillator for CNVST generation or, at least, to
clock it with a high frequency low jitter clock as shown in Figure 5.
t
9
RESET
DATA
BUSY
CNVST
t
8
Figure 12. RESET Timing
DIGITAL INTERFACE
The AD7677 has a versatile digital interface; it can be interfaced
with the host system by using either a serial or parallel interface.
The serial interface is multiplexed on the parallel data bus. The
AD7677 digital interface also accommodates both 3 V or 5 V
logic by simply connecting the OVDD supply pin of the AD7677
to the host system interface digital supply. Finally, by using the
OB/
2C
input pin, both two’s complement or straight binary
coding can be used.
The two signals,
CS
and
RD
, control the interface. When at least
one of these signals is high, the interface outputs are in high
impedance. Usually,
CS
allows the selection of each AD7677 in
multicircuits applications and is held low in a single AD7677
design.
RD
is generally used to enable the conversion result on
the data bus.
CNVST
BUSY
DATA
BUS
CS
=
RD
= 0
PREVIOUS CONVERSION DATA
NEW DATA
t
1
t
10
t
4
t
3
t
11
Figure 13. Master Parallel Data Timing for Reading
(Continuous Read)
PARALLEL INTERFACE
The AD7677 is configured to use the parallel interface (Figure 13)
when the SER/
PAR
is held low. The data eithercan be read
after each conversion, which is during the next acquisition phase,
or during the following conversion as shown, respectively, in
Figure 14 and Figure 15. When the data is read during the conver-
sion however, it is recommended that it is a read-only during
the first half of the conversion phase. This avoids any potential
feedthrough between voltage transients on the digital interface
and the most critical analog conversion circuitry.
DATA
BUS
t
12
t
13
BUSY
CS
RD
CURRENT
CONVERSION
Figure 14. Slave Parallel Data Timing for Reading (Read
After Convert)
CS
= 0
CNVST
,
RD
t
1
PREVIOUS
CONVERSION
DATA
BUS
t
12
t
13
BUSY
t
4
t
3
Figure 15. Slave Parallel Data Timing for Reading (Read
During Convert)
The BYTESWAP pin allows a glueless interface to an 8-bit bus.
As shown in Figure 16, the LSB byte is output on D[7:0] and
the MSB is output on D[15:8] when BYTESWAP is low. When
BYTESWAP is high, the LSB and MSB bytes are swapped and
the LSB is output on D[15:8] and the MSB is output on D[7:0].
By connecting BYTESWAP to an address line, the 16 bits of
data can be read in 2 bytes on either D[15:8] or D[7:0].
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD7677ASTRL | 制造商:Analog Devices 功能描述:ADC Single SAR 1Msps 16-bit Parallel/Serial 48-Pin LQFP T/R |
| AD7677ASTZ | 功能描述:IC ADC 16BIT 1MSPS DIFF 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
| AD7677ASTZ | 制造商:Analog Devices 功能描述:IC 16-BIT ADC |
| AD7677ASTZRL | 功能描述:IC ADC 16BIT 1MSPS DIFF 48-LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:PulSAR® 標準包裝:1 系列:- 位數:14 采樣率（每秒）:83k 數據接口:串行，并聯 轉換器數目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數目和類型:1 個單端，雙極 |
| AD7678 | 制造商:AD 制造商全稱:Analog Devices 功能描述:18-Bit, 2.5 LSB INL, 570 kSPS SAR ADC |
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