参数资料
| 型号： | ADS828EG4 |
| 厂商： | Texas Instruments |
| 文件页数： | 17/17页 |
| 文件大小： | 0K |
| 描述： | IC 10BIT 75MHZ ADC 28-SSOP |
| 产品培训模块： | Data Converter Basics |
| 标准包装： | 50 |
| 系列： | SpeedPlus™ |
| 位数： | 10 |
| 采样率（每秒）： | 75M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 340mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
| 输入数目和类型： | 2 个单端，单极；1 个差分，单极 |
ADS828
9
SBAS126A
FIGURE 2. AC-Coupled Input Configuration for a 2Vp-p Full-Scale Range and a Common-Mode Voltage, VCM, at +2.5V Derived
From The Internal Top (REFT) and Bottom Reference (REFB).
FIGURE 3. AC-Coupling the Dual Supply Amplifier OPA642 to the ADS828 for a 2Vp-p Full-Scale Input Range.
For applications requiring the driving amplifier to provide a
signal amplification, with a gain
≥ 5, consider using decom-
pensated voltage-feedback op amps, like the OPA643, or
current-feedback op amps like the OPA681 and OPA658.
DC-coupled with Level Shift
Several applications may require that the bandwidth of the
signal path include DC, in which case, the signal has to be
DC-coupled to the A/D converter. In order to accomplish
this, the interface circuit has to provide a DC level shift to
the analog input signal. The circuit shown in Figure 4
employs a dual op amp, A1, to drive the input of the
ADS828 and level shift the signal to be compatible with the
selected input range. With the RSEL pin tied to the supply
and the INT/EXT pin to ground, the ADS828 is configured
for a 2Vp-p input range and uses the internal references. The
complementary input (IN) may be appropriately biased
using the +2.5V common-mode voltage available at the
CM pin. One-half of amplifier A1 buffers the REFB pin and
drives the voltage divider R1, R2. Because of the op amp’s
noise gain of +2V/V, assuming RF = RIN, the common-mode
voltage (VCM) has to be re-scaled to +1.25. This results in
the correct DC level of +2.5V for the signal input (IN). Any
DC voltage differences between the IN and IN inputs of the
ADS828 effectively produces an offset, which can be cor-
rected for by adjusting the resistor values of the divider, R1
and R2. The selection criteria for a suitable op amp should
include the supply voltage, input bias current, output voltage
swing, distortion, and noise specification. Note that in this
example, the overall signal phase is inverted. To re-establish
the original signal polarity, it is always possible to inter-
change the IN and IN connections.
+V
IN
0V
–V
IN
OPA680
V
IN
R
F
402
1.0k
R
G
402
ADS828
R
S
50
10pF
0.1
F
IN
CM
INT/EXT
GND
REFT
+3.5V
1.0k
50
V
CM +2.5V
REFB
+1.5V
0.1
F
0.1
F
RSEL
+V
S
+5V
OPA642
V
IN
R
F
402
1.0k
R
G
402
ADS828
R
S
24.9
1.0k
100pF
0.1
F
0.1
F
IN
CM
REFB
+1.5V
INT/EXT
GND
REFT
+3.5V
RSEL
+V
S
+5V
–5V
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| ADS830 | 制造商:BB 制造商全称:BB 功能描述:8-Bit, 60MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS830E | 功能描述:模数转换器 - ADC 8-Bit 60 MSPS SE/Diff Inputs RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS830E/2K5 | 功能描述:模数转换器 - ADC 8-Bit 60 MSPS SE/Diff Inputs RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS830E/2K5G4 | 功能描述:模数转换器 - ADC 8-Bit 60 MSPS SE/Diff Inputs RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| ADS830EG4 | 功能描述:模数转换器 - ADC 8-Bit 60 MSPS SE/Diff Inputs RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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