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| 型号： | AD7699BCPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 8CH 16BIT 500KSPS 20LFCSP |
| 标准包装： | 1 |
| 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）： | 32mW |
| 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： | 20-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 20-LFCSP-VQ |
| 包装： | 托盘 |
| 输入数目和类型： | 8 个单端，单极；4 个差分，单极；4 个差分，双极；4 个伪差分，双极 |
| 产品目录页面： | 778 (CN2011-ZH PDF) |
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Data Sheet
AD7699
Rev.
| Page 13 of 28
THEORY OF OPERATION
SW+
MSB
16,384C
INx+
LSB
COMP
CONTROL
LOGIC
SWITCHES CONTROL
BUSY
OUTPUT CODE
CNV
REF
GND
INx– OR
COM
4C
2C
C
32,768C
SW–
MSB
16,384C
LSB
4C
2C
C
32,768C
07
35
4-
02
3
Figure 25. ADC Simplified Schematic
OVERVIEW
The AD7699 is an 8-channel, 16-bit, charge redistribution
successive approximation register (SAR) analog-to-digital
converter (ADC). It is capable of converting 500,000 samples
per second (500 kSPS) and power down between conversions.
For example, when operating with an external reference at
1 kSPS, it consumes 52 μW typically, ideal for battery-powered
applications.
The AD7699 contains all of the components for use in a
multichannel, low power data acquisition system, including
16-bit SAR ADC with no missing codes
8-channel, low crosstalk multiplexer
Internal low drift reference and buffer
Temperature sensor
Selectable one-pole filter
Channel sequencer
These components are configured through an SPI-compatible,
14-bit register. Conversion results, also SPI compatible, can be
read after or during conversions with the option for reading
back the configuration.
The AD7699 provides the user with an on-chip track-and-hold
and does not exhibit pipeline delay or latency.
The AD7699 is specified from 4.5 V to 5.5 V and can be interfaced
to any 1.8 V to 5 V digital logic family. It is housed in a 20-lead,
4 mm × 4 mm LFCSP that combines space savings and allows
flexible configurations and is also pin-for-pin compatible with
CONVERTER OPERATION
The AD7699 is a successive approximation ADC based on a
charge redistribution DAC. Figure 25 shows the simplified
schematic of the ADC. The capacitive DAC consists of two
identical arrays of 16 binary-weighted capacitors, which are
connected to the two comparator inputs.
During the acquisition phase, terminals of the array tied to the
comparator input are connected to GND via SW+ and SW. All
independent switches are connected to the analog inputs.
Thus, the capacitor arrays are used as sampling capacitors and
acquire the analog signal on the INx+ and INx (or COM)
inputs. When the acquisition phase is complete and the CNV
input goes high, a conversion phase is initiated. When the
conversion phase begins, SW+ and SW are opened first. The
two capacitor arrays are then disconnected from the inputs and
connected to the GND input. Therefore, the differential voltage
between the INx+ and INx (or COM) inputs captured at the
end of the acquisition phase is applied to the comparator inputs,
causing the comparator to become unbalanced. By switching
each element of the capacitor array between GND and REF, the
comparator input varies by binary-weighted voltage steps
(VREF/2, VREF/4, ... VREF/32,768). The control logic toggles these
switches, starting with the MSB, to bring the comparator back
into a balanced condition. After the completion of this process,
the part returns to the acquisition phase, and the control logic
generates the ADC output code and a busy signal indicator.
Because the AD7699 has an on-board conversion clock, the
serial clock, SCK, is not required for the conversion process.
B
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| AD7699BCPZRL7 | 功能描述:IC ADC 8CH 16BIT 500KSPS 20LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 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 |
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| AD7701AN | 功能描述:IC ADC 16BIT LC2MOS 20-DIP RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
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| AD7701AQ | 制造商:AD 制造商全称:Analog Devices 功能描述:LC2MOS 16-Bit A/D Converter |
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