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参数资料
| 型号： | EVAL-AD7356EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/21页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AD7356 |
| 标准包装： | 1 |
| ADC 的数量： | 2 |
| 位数： | 12 |
| 采样率（每秒）： | 5M |
| 数据接口： | 串行 |
| 输入范围： | ±VREF/2 |
| 在以下条件下的电源（标准）： | 36mW @ 5MSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7356 |
| 已供物品： | 板，CD |
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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| EVAL-AD7357EDZ | 功能描述:BOARD EVAL FOR AD7357 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7366CBZ | 功能描述:BOARD EVALUATION FOR AD7366 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:iCMOS® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7366SDZ | 功能描述:BOARD EVAL FOR AD7366 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:iCMOS® 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| EVAL-AD7367CBZ | 制造商:AD 制造商全称:Analog Devices 功能描述:True Bipolar Input, Dual 1 レs, 12-/14-Bit, 2-Channel SAR ADCs |
| EVAL-AD7367SDZ | 功能描述:数据转换 IC 开发工具 EVALUATION CONTROL BOARD I.C. RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
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