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| 型号： | AD7688BCPZRL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT SAR 500KSPS 10LFCSP |
| 标准包装： | 1 |
| 系列： | PulSAR® |
| 位数： | 16 |
| 采样率（每秒）： | 500k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 21.5mW |
| 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-WFDFN 裸露焊盘，CSP |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
| 包装： | 标准包装 |
| 输入数目和类型： | 2 个单端，单极；2 个单端，双极；1 个差分，单极；1 个差分，双极 |
| 其它名称： | AD7688BCPZRL7DKR |
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AD7688
Rev. A | Page 16 of 28
02973-
030
FREQUENCY (kHz)
10000
1
1000
10
100
P
S
RR
(
d
B)
95
90
85
80
75
70
65
60
Figure 31. PSRR vs. Frequency
The AD7688 powers down automatically at the end of each
conversion phase and, therefore, the power scales linearly with
the sampling rate, as shown in Figure 32. 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
02973-
031
VIO
VDD
Figure 32. Operating Currents vs. Sampling Rate
SUPPLYING THE ADC FROM THE REFERENCE
For simplified applications, the AD7688, with its low operating
current, can be supplied directly using the reference circuit
shown in Figure 33. 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 33.
AD8031
AD7688
VIO
REF
VDD
10
μF
1
μF
10
Ω
10k
Ω
5V
1
μF
1
02973-
032
1OPTIONAL REFERENCE BUFFER AND FILTER.
Figure 33. Example of Application Circuit
DIGITAL INTERFACE
Though the AD7688 has a reduced number of pins, it offers
flexibility in its serial interface modes.
The AD7688, when in CS mode, is compatible with SPI, QSPI,
digital hosts, and DSPs, e.g., 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 AD7688, 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 AD7688 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
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相关代理商/技术参数 |
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| AD7688BRM | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Serial 10-Pin MSOP Tube 制造商:Rochester Electronics LLC 功能描述:16-BIT DIFF, 550KSPS SERIAL MSOP ADC - Bulk 制造商:Analog Devices 功能描述:IC 16-BIT ADC |
| AD7688BRMRL7 | 制造商:Analog Devices 功能描述:ADC Single SAR 500ksps 16-bit Serial 10-Pin MSOP T/R |
| AD7688BRMZ | 功能描述:IC ADC DIFF 16BIT 500KSPS 10MSOP 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 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7688BRMZRL7 | 功能描述:IC ADC 16BIT 500KSPS 10MSOP 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 |
| AD7689 | 制造商:AD 制造商全称:Analog Devices 功能描述:14-Bit, 8-Channel, 250 kSPS PulSAR ADC |
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