- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1982 > AD7687BCPZRL (Analog Devices Inc)IC ADC 16BIT SAR 250KSPS 10LFCSP PDF資料下載
參數(shù)資料
| 型號： | AD7687BCPZRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT SAR 250KSPS 10LFCSP |
| 標準包裝： | 5,000 |
| 系列： | PulSAR® |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 12.5mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤，CSP |
| 供應商設備封裝： | 10-LFCSP-WD（3x3） |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
| 配用： | EVAL-AD7687CBZ-ND - BOARD EVALUATION FOR AD7687 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當前第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
Data Sheet
AD7687
Rev. B | Page 17 of 28
insensitive to power supply variations over a wide frequency
range, as shown in Figure 32, which represents PSRR over
frequency.
FREQUENCY (kHz)
PSRR
(dB)
100
95
90
85
80
75
70
65
60
55
50
1
10
100
1000
10000
02972-
031
VDD = 5V
VDD = 2.5V
Figure 32. PSRR vs. Frequency
The AD7687 powers down automatically at the end of each
conversion phase and, therefore, the power scales linearly with
the sampling rate, as shown in Figure 33. This makes the part
ideal for low sampling rate (even a few Hz) and low battery-
powered applications.
SAMPLING RATE (SPS)
OPERATI
NG
CURRENT
(
μA)
1000
10
0.1
0.001
10
100
1000
10000
100000
1000000
02972-
032
VIO
VDD = 5V
VDD = 2.5V
Figure 33. Operating Currents vs. Sampling Rate
SUPPLYING THE ADC FROM THE REFERENCE
For simplified applications, the AD7687, with its low operating
current, can be supplied directly using the reference circuit
shown in Figure 34. The reference line can be driven by either:
The system power supply directly
A reference voltage with enough current output capability,
such as the ADR43x
A reference buffer, such as the AD8031, which can also
filter the system power supply, as shown in Figure 34
AD8031
AD7687
VIO
REF
VDD
10
μF
1
μF
10
Ω
10k
Ω
5V
1
μF
1
02972-
033
1OPTIONAL REFERENCE BUFFER AND FILTER.
Figure 34. Example of Application Circuit
DIGITAL INTERFACE
Though the AD7687 has a reduced number of pins, it offers
flexibility in its serial interface modes.
The AD7687, when in CS mode, is compatible with SPI, QSPI,
digital hosts, and DSPs, for example, Blackfin ADSP-BF53x or
ADSP-219x. This interface can use either 3-wire or 4-wire. A 3-
wire interface using the CNV, SCK, and SDO signals minimizes
wiring connections useful, for instance, in isolated applications.
A 4-wire interface using the SDI, CNV, SCK, and SDO signals
allows CNV, which initiates the conversions, to be independent
of the readback timing (SDI). This is useful in low jitter
sampling or simultaneous sampling applications.
The AD7687, when in chain mode, provides a daisy chain
feature using the SDI input for cascading multiple ADCs on a
single data line similar to a shift register.
The mode in which the part operates depends on the SDI level
when the CNV rising edge occurs. The CS mode is selected if
SDI is high and the chain mode is selected if SDI is low. The
SDI hold time is such that when SDI and CNV are connected
together, the chain mode is always selected.
In either mode, the AD7687 offers the flexibility to optionally
force a start bit in front of the data bits. This start bit can be
used as a BUSY signal indicator to interrupt the digital host and
trigger the data reading. Otherwise, without a BUSY indicator,
the user must time out the maximum conversion time prior to
readback.
The BUSY indicator feature is enabled as:
In the CS mode, if CNV or SDI is low when the ADC
conversion ends (
and
).
In the chain mode, if SCK is high during the CNV rising edge
相關PDF資料 |
PDF描述 |
|---|---|
| AD7688BCPZRL7 | IC ADC 16BIT SAR 500KSPS 10LFCSP |
| AD7689BCPZRL7 | IC ADC 16BIT 250KSPS 8CH 20LFCSP |
| AD7690BCPZRL | IC ADC 18BIT 400KSPS 10-LFCSP |
| AD7691BCPZRL7 | IC ADC 18BIT SAR 250KSPS 10LFCSP |
| AD7693BRMZRL7 | IC ADC 16BIT 500KSPS 10-MSOP |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD7687BCPZRL7 | 功能描述:IC ADC 16BIT SAR 250KSPS 10LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:PulSAR® 其它有關文件:TSA1204 View All Specifications 標準包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)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(shù)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 |
| AD7687BRM | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 16-bit Serial 10-Pin MSOP Tube 制造商:Analog Devices 功能描述:IC 16-BIT ADC |
| AD7687BRMRL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 250ksps 16-bit Serial 10-Pin MSOP T/R |
| AD7687BRMZ | 功能描述:IC ADC 16BIT 250KSPS 10-MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:PulSAR® 標準包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)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(shù)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 |
| AD7687BRMZRL7 | 功能描述:IC ADC 16BIT 250KSPS 10MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:PulSAR® 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。