收藏本站
参数资料
型号： AD7323BRUZ-REEL7
厂商： Analog Devices Inc
文件页数： 9/37页
文件大小： 0K
描述： IC ADC 12BIT+ SAR 4CHAN 16TSSOP
标准包装： 1,000
位数： 12
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）： 17mW
电压电源： 双 ±
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 16-TSSOP（0.173"，4.40mm 宽）
供应商设备封装： 16-TSSOP
包装： 带卷 (TR)
输入数目和类型： 4 个单端，单极；4 个单端，双极；2 个差分，单极；2 个差分，双极
配用： EVAL-AD7323CBZ-ND - BOARD EVALUATION FOR AD7323CBZ
AD7323
Data Sheet
Rev. B | Page 16 of 36
THEORY OF OPERATION
CIRCUIT INFORMATION
The AD7323 is a fast, 4-channel, 12-bit plus sign, bipolar input,
serial ADC. The AD7323 can accept bipolar input ranges that
include ±10 V, ±5 V, and ±2.5 V; it can also accept a 0 V to
+10 V unipolar input range. A different analog input range can
be programmed on each analog input channel via the on-chip
registers. The AD7323 has a high speed serial interface that can
operate at throughput rates up to 500 kSPS.
The AD7323 requires VDD and VSS dualsupplies for the high voltage
analog input structures. These supplies must be equal to or greater
than the largest analog input range selected. See Table 6 for the
requirements of these supplies for each analog input range. The
AD7323 requires a low voltage 2.7 V to 5.25 V VCC supply to
power the ADC core.
Table 6. Reference and Supply Requirements for Each
Analog Input Range
Selected
Analog Input
Range (V)
Reference
Voltage (V)
Full-Scale
Input
Range (V)
VCC (V)
Minimum
VDD/VSS(V)1
±10
2.5
±10
3/5
±10
3.0
±12
3/5
±12
±5
2.5
±5
3/5
±5
3.0
±6
3/5
±6
±2.5
2.5
±2.5
3/5
±5
3.0
±3
3/5
±5
0 to +10
2.5
0 to +10
3/5
+10/AGND
3.0
0 to +12
3/5
+12/AGND
1
Guaranteed performance for VDD = 12 V to 16.5 V and VSS = 12 V to 16.5 V.
The performance specifications are guaranteed for VDD = 12 V
to 16.5 V and VSS = 12 V to 16.5 V. With VDD and VSS supplies
outside this range, the AD7323 is fully functional but performance
is not guaranteed. It may be necessary to decrease the throughput
rate when the AD7323 is configured with the minimum VDD and
VSS supplies (see the Typical Performance Characteristics section).
Figure 31 shows the change in THD as the VDD and VSS supplies
are reduced. For ac performance at the maximum throughput
rate, the THD degrades slightly as VDD and VSS are reduced. It may
therefore be necessary to reduce the throughput rate when using
minimum VDD and VSS supplies so that there is less degradation
of THD and the specified performance can be maintained. The
degradation is due to an increase in the on resistance of the
input multiplexer when the VDD and VSS supplies are reduced.
Figure 18 and Figure 19 show the change in INL and DNL as
the VDD and VSS voltages are varied. For dc performance when
operating at the maximum throughput rate, as the VDD and VSS
supply voltages are reduced, the typical INL and DNL error
remains constant.
The analog inputs can be configured as four single-ended
inputs, two true differential inputs, two pseudo differential
inputs, or three pseudo differential inputs. Selection can be
made by programming the mode bits, Mode 0 and Mode 1,
in the control register.
The serial clock input accesses data from the part and provides
the clock source for the successive approximation ADC. The
AD7323 has an on-chip 2.5 V reference. However, the AD7323
can also work with an external reference. On power-up, the
external reference operation is the default option. If the internal
reference is the preferred option, the user must write to the
reference bit in the control register to select the internal refer-
ence operation.
The AD7323 also features power-down options to allow power
savings between conversions. The power-down modes are
selected by programming the on-chip control register, as
described in the Modes of Operation section.
CONVERTER OPERATION
The AD7323 is a successive approximation ADC built around
two capacitive DACs. Figure 23 and Figure 24 show simplified
schematics of the ADC in single-ended mode during the acquisi-
tion and conversion phases, respectively. Figure 25 and Figure 26
show simplified schematics of the ADC in differential mode
during acquisition and conversion phases, respectively. The
ADC is composed of control logic, a SAR, and capacitive DACs.
In Figure 23 (the acquisition phase), SW2 is closed and SW1 is
in Position A, the comparator is held in a balanced condition,
and the sampling capacitor array acquires the signal on the input.
CAPACITIVE
DAC
CONTROL
LOGIC
COMPARATOR
AGND
SW2
SW1
A
B
CS
VINx
05400-
017
Figure 23. ADC Acquisition Phase (Single-Ended)
When the ADC starts a conversion (see Figure 24), SW2 opens
and SW1 moves to Position B, causing the comparator to become
unbalanced. The control logic and the charge redistribution
DAC are used to add and subtract fixed amounts of charge from
the capacitive DAC to bring the comparator back into a balanced
condition. When the comparator is rebalanced, the conversion
is complete. The control logic generates the ADC output code.
CAPACITIVE
DAC
CONTROL
LOGIC
COMPARATOR
AGND
SW2
SW1
A
B
CS
VINx
05400-
018
Figure 24. ADC Conversion Phase (Single-Ended)
相关PDF资料
PDF描述
AD7324BRUZ-REEL IC ADC 12BIT+SAR 4CHAN 16-TSSOP
AD7327BRUZ-REEL7 IC ADC 12BIT+ SAR 8CHAN 20TSSOP
AD7328BRUZ-REEL IC ADC 12BIT+SAR 8CHAN 20-TSSOP
AD7329BRUZ-REEL7 IC ADC 12BIT+SAR 8CHAN 24-TSSOP
AD73311ARSZ IC ANALOG FRONT END 20-SSOP
相关代理商/技术参数
参数描述
AD7324 制造商:AD 制造商全称:Analog Devices 功能描述:4-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
AD7324BRUZ 功能描述:IC ADC 12BIT+ SAR 4CHAN 16TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 其它有关文件:TSA1204 View All Specifications 标准包装:1 系列:- 位数:12 采样率（每秒）:20M 数据接口:并联 转换器数目:2 功率耗散（最大）:155mW 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:48-TQFP 供应商设备封装:48-TQFP（7x7） 包装:Digi-Reel® 输入数目和类型:4 个单端，单极；2 个差分，单极 产品目录页面:1156 (CN2011-ZH PDF) 其它名称:497-5435-6
AD7324BRUZ-REEL 功能描述:IC ADC 12BIT+SAR 4CHAN 16-TSSOP 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:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极
AD7324BRUZ-REEL7 功能描述:IC ADC 12BIT+ SAR 4CHAN 16TSSOP 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:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极
AD7327 制造商:AD 制造商全称:Analog Devices 功能描述:500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*