- 您现在的位置：买卖IC网 > PDF目录10661 > AD7691BRMZ (Analog Devices Inc)IC ADC 18BIT SAR 250KSPS 10-MSOP PDF资料下载
参数资料
| 型号： | AD7691BRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 18BIT SAR 250KSPS 10-MSOP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 18 |
| 采样率（每秒）： | 250k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 12.5mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分，双极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
| 配用： | EVAL-AD7691CBZ-ND - BOARD EVALUATION FOR AD7691CBZ |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
Data Sheet
AD7691
Rev. C | Page 17 of 28
AD8031
AD7691
VIO
REF
VDD
10F
1F
10
10k
5V
1F
1
1OPTIONAL REFERENCE BUFFER AND FILTER.
06
14
6-
04
6
POWER SUPPLY
The AD7691 uses two power supply pins: a core supply (VDD) and
a digital input/output interface supply (VIO). VIO allows direct
interface with any logic between 1.8 V and VDD. To reduce the
supplies needed, the VIO and VDD pins can be tied together. The
AD7691 is independent of power supply sequencing between VIO
and VDD. Additionally, it is very insensitive to power supply
variations over a wide frequency range, as shown in Figure 25.
The AD7691 powers down automatically at the end of each
conversion phase, and therefore, the power scales linearly with
the sampling rate. This makes the part ideal for low sampling
rate (as low as a few hertz) and low battery-powered applications.
Figure 34. Example of an Application Circuit
DIGITAL INTERFACE
Though the AD7691 has a reduced number of pins, it offers
flexibility in its serial interface modes.
1000
10
0.1
0.001
10
1M
SAMPLING RATE (SPS)
O
P
E
RAT
ING
C
URRE
NT
(
A
)
100
1k
100k
10k
VDD = 5V
VIO
06
14
6-
04
5
When in CS mode, the AD7691 is compatible with SPI, QSPI,
digital hosts, and DSPs, for example, Blackfin ADSP-BF53x or
ADSP-219x. In this mode, the AD7691 can use either a 3-wire
or 4-wire interface. A 3-wire interface using the CNV, SCK, and
SDO signals minimizes wiring connections and is 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.
When in chain mode, the AD7691 provides a daisy-chain
feature using the SDI input for cascading multiple ADCs on a
single data line similar to a shift register.
Figure 33. Operating Current vs. Sample Rate
SUPPLYING THE ADC FROM THE REFERENCE
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 selected.
For simplified applications, the AD7691, with its low operating
current, can be supplied directly using the reference circuit
shown in Figure 34. The reference line can be driven by
The system power supply directly.
A reference voltage with enough current output capability, such
as the ADR43x.
In either mode, the AD7691 offers the option of forcing 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
timeout the maximum conversion time prior to readback.
A reference buffer, such as the AD8031, which can also filter the
system power supply, as shown in Figure 34.
The busy indicator feature is enabled
In the CS mode if CNV or SDI is low when the ADC
conversion ends (see
and
).
In the chain mode if SCK is high during the CNV rising edge
(see Figure 46).
相关PDF资料 |
PDF描述 |
|---|---|
| VE-B1V-IV-F4 | CONVERTER MOD DC/DC 5.8V 150W |
| MAX931CSA+T | IC COMPARATOR W/REF 8-SOIC |
| LTC2383CMS-16#PBF | IC ADC 16BIT 1CH 1MSPS 16MSOP |
| VE-B1V-IV-F3 | CONVERTER MOD DC/DC 5.8V 150W |
| KSZ8031RNL TR | TXRX PHY 100BASE TX 3.3V 24QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7691BRMZ-RL7 | 功能描述:IC ADC 18BIT SAR 250KSPS 10-MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:PulSAR® 标准包装:1,000 系列:- 位数:12 采样率（每秒）:300k 数据接口:并联 转换器数目:1 功率耗散（最大）:75mW 电压电源:单电源 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-SOIC（0.295"，7.50mm 宽） 供应商设备封装:24-SOIC 包装:带卷 (TR) 输入数目和类型:1 个单端，单极；1 个单端，双极 |
| AD7693 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit Lower Power |
| AD76931 | 制造商:AD 制造商全称:Analog Devices 功能描述:18-Bit, 2 MSPS PulSAR 15 mW ADC in LFCSP (QFN) |
| AD7693BCPZ | 制造商:Analog Devices 功能描述:ADC SGL SAR 500KSPS 16BIT SERL 10LFCSP - Rail/Tube |
| AD7693BCPZ-R2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
发布紧急采购，3分钟左右您将得到回复。