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参数资料
| 型号： | AD7323BRUZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/37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 |
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Data Sheet
AD7323
Rev. B | Page 17 of 36
Figure 25 shows the differential configuration during the
acquisition phase. For the conversion phase, SW3 opens and
SW1 and SW2 move to Position B (see Figure 26). The output
impedances of the source driving the VIN+ and VIN inputs
must match; otherwise, the two inputs have different settling
times, resulting in errors.
05400-
019
CAPACITIVE
DAC
CONTROL
LOGIC
CAPACITIVE
DAC
COMPARATOR
SW3
SW1
A
B
CS
VIN+
SW2
A
B
VIN–
VREF
NOTES
1. VIN+ CAN BE VIN0 OR VIN2, AND VIN– CAN BE VIN1 OR VIN3.
Figure 25. ADC Differential Configuration During Acquisition Phase
CAPACITIVE
DAC
CONTROL
LOGIC
CAPACITIVE
DAC
COMPARATOR
SW3
SW1
A
B
CS
VIN+
SW2
A
B
VIN–
VREF
05400-
020
NOTES
1. VIN+ CAN BE VIN0 OR VIN2, AND VIN– CAN BE VIN1 OR VIN3.
Figure 26. ADC Differential Configuration During Conversion Phase
Output Coding
The AD7323 default output coding is set to twos complement.
The output coding is controlled by the coding bit in the control
register. To change the output coding to straight binary coding,
the coding bit in the control register must be set. When operat-
ing in sequence mode, the output coding for each channel in
the sequence is the value written to the coding bit during the
last write to the control register.
Transfer Functions
The designed code transitions occur at successive integer
LSB values (that is, 1 LSB, 2 LSB, and so on). The LSB size is
dependent on the analog input range selected.
Table 7. LSB Sizes for Each Analog Input Range
Input Range
Full-Scale Range/8192 Codes
LSB Size
±10 V
20 V
2.441 mV
±5 V
10 V
1.22 mV
±2.5 V
5 V
0.61 mV
0 V to +10 V
10 V
1.22 mV
The ideal transfer characteristic for the AD7323 when twos
complement coding is selected is shown in Figure 27. The ideal
transfer characteristic for the AD7323 when straight binary
coding is selected is shown in Figure 28.
011...111
011...110
000...001
000...000
111...111
–FSR/2 + 1LSB
AGND + 1LSB
+FSR/2 – 1LSB BIPOLAR RANGES
+FSR – 1LSB
UNIPOLAR RANGE
AGND – 1LSB
ANALOG INPUT
ADC
CO
DE
100...010
100...001
100...000
05400-
021
Figure 27. Twos Complement Transfer Characteristic
111...111
111...110
111...000
011...111
–FSR/2 + 1LSB
AGND + 1LSB
+FSR/2 – 1LSB BIPOLAR RANGES
+FSR – 1LSB
UNIPOLAR RANGE
ANALOG INPUT
ADC
CO
DE
000...010
000...001
000...000
05400-
022
Figure 28. Straight Binary Transfer Characteristic
ANALOG INPUT STRUCTURE
The analog inputs of the AD7323 can be configured as single-
ended, true differential, or pseudo differential via the control
register mode bits (see Table 9). The AD7323 can accept true
bipolar input signals. On power-up, the analog inputs operate as
four single-ended analog input channels. If true differential or
pseudo differential is required, a write to the control register is
necessary after power-up to change this configuration.
Figure 29 shows the equivalent analog input circuit of the
AD7323 in single-ended mode. Figure 30 shows the equivalent
analog input structure in differential mode. The two diodes
provide ESD protection for the analog inputs.
D
VDD
C2
R1
VINx
VSS
C1
05400-
023
Figure 29. Equivalent Analog Input Circuit (Single-Ended)
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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 |
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