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| 型号： | EVAL-AD7760EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/37页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL CONTROL AD7760 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 2.5M |
| 数据接口： | 并联 |
| 输入范围： | ±3.25 Vpp |
| 在以下条件下的电源（标准）： | 958mW @ 2.5MSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7760 |
| 已供物品： | 板，CD |
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AD7760
Rev. A | Page 26 of 36
DRIVING THE AD7760
The AD7760 has an on-chip differential amplifier that operates
with a supply voltage (AVDD3) within the 3.15 V to 5.25 V range.
For a 4.096 V reference, the supply voltage must be 5 V.
To achieve the specified performance in normal mode, the
differential amplifier should be configured as a first-order
antialias filter, as shown in Figure 50. Any additional filtering
should be carried out in previous stages using low noise, high
performance op amps, such as the AD8021.
Suitable component values for the first-order filter are listed in
Table 8. Using the values in the table as an example yields a
10 dB attenuation at the first alias point of 19 MHz.
A1
RIN
RFB
CFB
RIN
RM
CS
RFB
CFB
VIN–
A
B
VIN+
0
49
75
-04
0
Figure 50. Differential Amplifier Configuration
Table 8. Normal Mode Component Values
VREF
RIN
RFB
RM
CS
CFB
4.096 V
1 kΩ
655 Ω
18 Ω
5.6 pF
33 pF
Figure 52 shows the signal conditioning that occurs using the
circuit shown in Figure 50 with a ±2.5 V input signal biased
around ground and the component values and conditions listed
in Table 8. The differential amplifier always biases the output
signal to sit on the optimum common mode of VREF/2, in this
case 2.048 V. The signal is also scaled to give the maximum
allowable voltage swing with this reference value. This is
calculated as 80% of VREF, that is, 0.8 × 4.096 V ≈ 3.275 V p-p
on each input.
With a 4.096 V reference, a 5 V supply must be provided to the
reference buffer (AVDD4). With a 2.5 V reference, a 3.3 V supply
must be provided to AVDD4.
Figure 51 shows the transfer function in terms of the 24-bit
digital output codes (twos complement coding) of the AD7760
vs. the voltage signals VA and VB applied to the on-board
differential amplifier A1, as shown in Figure 52.
011…111
011…110
000…010
000…001
000…000
111…111
111…110
100…000
100…001
24 BITS
AD7760
24-BIT
OUTPUT
B= +2.5V
A = –2.5V
A= 0V
B= 0V
A= +2.5V
B = –2.5V
049
75-
056
Figure 51. Transfer Function for the AD7760 Filtered Output Where VA and VB
are Inputs to the On-Board Differential Amplifier A1
+2.5V
0V
–2.5V
A
+2.5V
0V
–2.5V
B
INPUTS TO THE AD7760 DIFFERENTIAL AMPLIFIER
OUTPUTS OF THE AD7760 DIFFERENTIAL AMPLIFIER
+3.685V
+2.048V
+0.410V
+3.685V
+2.048V
+0.410V
VIN+
VIN–
0
4
975
-05
5
Figure 52. Differential Amplifier Signal Conditioning
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-AD7762EB | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD I.C. - Bulk |
| EVAL-AD7762EBZ | 制造商:Analog Devices 功能描述:EVALUATION CONTROL BOARD I.C. - Bulk |
| EVAL-AD7762EDZ | 功能描述:BOARD EVAL CONTROL AD7762 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-AD7763EB | 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk |
| EVAL-AD7763EBZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD I.C. - Bulk |
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