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| 型号： | AD7356YRUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/21页 |
| 文件大小： | 0K |
| 描述： | IC ADC DUAL 12BIT 5MSPS 16TSSOP |
| 设计资源： | DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7356 (CN0041) |
| 标准包装： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 50k |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 59mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°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： | 管件 |
| 输入数目和类型： | 2 个差分，双极 |
AD7356
Rev. A | Page 12 of 20
THEORY OF OPERATION
CIRCUIT INFORMATION
The AD7356 is a high speed, dual, 12-bit, single-supply, succes-
sive approximation analog-to-digital converter (ADC). The part
operates from a 2.5 V power supply and features throughput
rates of up to 5 MSPS.
The AD7356 contains two on-chip differential track-and-hold
amplifiers, two successive approximation ADCs, and a serial
interface with two separate data output pins. The part is housed
in a 16-lead TSSOP, offering the user considerable space-saving
advantages over alternative solutions.
The serial clock input accesses data from the part but also
provides the clock source for each successive approximation
ADC. The AD7356 has an on-chip 2.048 V reference. If an
external reference is desired the internal reference can be
overdriven with a reference value ranging from (2.048 V +
100 mV) to VDD. If the internal reference is to be used elsewhere
in the system, then the reference output needs to be buffered
first. The differential analog input range for the AD7356 is
VCM ± VREF/2.
The AD7356 features power-down options to allow power
saving between conversions. The power-down feature is
implemented via the standard serial interface, as described
in the Modes of Operation section.
CONVERTER OPERATION
The AD7356 has two successive approximation ADCs, each
show simplified schematics of one of these ADCs in acquisition
and conversion phase. The ADC comprises a control logic, a
SAR, and two capacitive DACs. In Figure 14 (the acquisition
phase), SW3 is closed, SW1 and SW2 are in Position A, the
comparator is held in a balanced condition, and the sampling
capacitor arrays acquire the differential signal on the input.
CAPACITIVE
DAC
CAPACITIVE
DAC
CONTROL
LOGIC
COMPARATOR
SW3
SW1
A
B
SW2
CS
VIN+
VIN–
VREF
06
50
5-
01
2
Figure 14. ADC Acquisition Phase
When the ADC starts a conversion (see Figure 15), SW3 opens
and SW1 and SW2 move to Position B, causing the comparator
to become unbalanced. Both inputs are disconnected once the
conversion begins. The control logic and charge redistribution
DACs are used to add and subtract fixed amounts of charge
from the sampling capacitor arrays 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. The output impedances of
the sources driving the VIN+ and VIN pins must be matched;
otherwise, the two inputs may have different settling times,
resulting in errors.
CAPACITIVE
DAC
CAPACITIVE
DAC
CONTROL
LOGIC
COMPARATOR
SW3
SW1
A
B
SW2
CS
VIN+
VIN–
VREF
06
505
-013
Figure 15. ADC Conversion Phase
ANALOG INPUT STRUCTURE
Figure 16 shows the equivalent circuit of the analog input structure
of the AD7356. The four diodes provide ESD protection for the
analog inputs. Care must be taken to ensure that the analog input
signals never exceed the supply rails by more than 300 mV.
This causes these diodes to become forward biased and start
conducting into the substrate. These diodes can conduct up
to 10 mA without causing irreversible damage to the part.
The C1 capacitors in Figure 16 are typically 8 pF and can
primarily be attributed to pin capacitance. The R1 resistors
are lumped components made up of the on resistance of the
switches. The value of these resistors is typically about 30 Ω.
The C2 capacitors are the sampling capacitors of the ADC
with a capacitance of 32 pF typically.
VDD
C1
D
VIN+
R1 C2
VDD
C1
D
VIN–
R1 C2
06
50
5-
0
15
Figure 16. Equivalent Analog Input Circuit,
Conversion Phase–Switches Open,
Track Phase—Switches Closed
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相关代理商/技术参数 |
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|---|---|
| AD7356YRUZ-500RL7 | 功能描述:IC ADC DUAL 12BIT 5MSPS 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: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 |
| AD7356YRUZ-RL | 功能描述:IC ADC DUAL 12BIT 5MSPS 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: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 |
| AD7357 | 制造商:AD 制造商全称:Analog Devices 功能描述:Differential Input, Dual, Simultaneous Sampling, 4.2 MSPS, 14-Bit, SAR ADC |
| AD7357_08 | 制造商:AD 制造商全称:Analog Devices 功能描述:Differential Input, Dual, Simultaneous Sampling, 4.2 MSPS, 14-Bit, SAR ADC |
| AD7357_09 | 制造商:AD 制造商全称:Analog Devices 功能描述:Differential Input, Dual, Simultaneous Sampling, 4.2 MSPS, 14-Bit, SAR ADC |
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