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| 型号： | AD7356YRUZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/21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 14 of 20
06
50
5-
0
33
GND
2 × VREF p-p
27
V+
V–
V+
V–
1.024V
2.048V
0V
1.024V
2.048V
0V
REFA/REFB
VIN+
AD7356*
VIN–
220
10F
*ADDITIONAL PINS OMITTED FOR CLARITY.
220
20k
A
440
10k
220
0
6505-
031
+2.048V
GND
–2.048V
AD8138
RG1
RS*
RG2
RF2
VOCM
RF1
2.048V
VIN+
VIN–
1.024V
0V
2.048V
1.024V
0V
AD7356
CF2
CF1
10k
10F
REFA/REFB
*MOUNT AS CLOSE TO THE AD7356 AS POSSIBLE
AND ENSURE THAT HIGH PRECISION RS RESISTORS ARE USED.
RS – 33; RG1 = RF1 = RF2 = 499; CF1 = CF2 = 39pF;
RG2 = 523
51
Figure 22. Dual Op Amp Circuit to Convert a Single-Ended Bipolar Signal into
a Differential Unipolar Signal
VOLTAGE REFERENCE
Figure 20. Using the AD8138 as a Single-Ended-to-Differential Amplifier
The AD7356 allows the choice of a very low temperature drift
internal voltage reference or an external reference. The internal
2.048 V reference of the AD7356 provides excellent perfor-
mance and can be used in almost all applications. When the
internal reference is used, the reference voltage is present on
the REFA and REFB pins. These pins should be decoupled to
REFGND with 10 μF capacitors. The internal reference voltage
can be used elsewhere in the system, provided it is buffered
externally.
If the analog inputs source being used has zero impedance, all
four resistors (RG1, RG2, RF1, and RF2) should be the same value
as each other. If the source has a 50 Ω impedance and a 50 Ω
termination, for example, increase the value of RG2 by 25 Ω to
balance this parallel impedance on the input and thus ensure
that both the positive and negative analog inputs have the
same gain. The outputs of the amplifier are perfectly matched
balanced differential outputs of identical amplitude, and are
exactly 180° out of phase.
The REFA and REFB pins can also be overdriven with an
external voltage reference if desired. The applied reference
voltage can range from 2.048 V + 100 mV to VDD. A common
choice would be to use an external 2.5 V reference such as the
Op Amp Pair
An op amp pair can be used to directly couple a differential signal
to one of the analog input pairs of the AD7356. The circuit
an op amp pair can be used to convert a single-ended signal
into a differential signal for a bipolar and unipolar input signal,
respectively.
ADC TRANSFER FUNCTION
The output coding for the AD7356 is straight binary. The
designed code transitions occur at successive LSB values
(1 LSB, 2 LSBs, and so on). The LSB size is (2 × VREF)/4096.
The ideal transfer characteristic of the AD7356 is shown in
The voltage applied to Point A sets up the common-mode
voltage. In both diagrams, it is connected in some way to the
reference. The AD8022 is a suitable dual op amp that could be
used in this configuration to provide differential drive to the
AD7356.
000 ... 000
000 ... 001
000 ... 010
111 ... 101
111 ... 110
111 ... 111
A
DC
CO
D
E
ANALOG INPUT
–VREF + 0.5 LSB
–VREF + 1 LSB
+VREF – 1.5 LSB
+VREF – 1 LSB
06
505
-014
06
505
-03
2
GND
VREF p-p
27
V+
V–
V+
V–
1.024V
2.048V
0V
1.024V
2.048V
0V
REFA/REFB
VIN+
AD7356*
VIN–
220
10F
*ADDITIONAL PINS OMITTED FOR CLARITY.
220
10k
A
220
VREF
2
Figure 21. Dual Op Amp Circuit to Convert a Single-Ended Unipolar Signal
into a Differential Signal
Figure 23. AD7356 Ideal Transfer Characteristic
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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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