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參數(shù)資料
| 型號(hào)： | ADS807E |
| 英文描述： | 12-Bit, 53MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位，53MHz采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大小： | 225K |
| 代理商： | ADS807E |
11
ADS807
AC-Coupled, Single-Ended-to-Differential Interface
for Single-Supply Operation
The previously discussed interface circuit can be modified if
the system only allows for a single supply operation, e.g., V
S
= +5V. Single-supply operation requires the driver amplifier
to be biased as well in order to process a bipolar input signal.
Typically, single-supply amplifiers do not achieve distortion
performance as well as dual-supply op amps. The driver
amplifier’s output swing must exceed the full-scale input
range of the converter. In addition, dual op amps, such as the
current-feedback OPA2681, should be considered since they
provide the closest open-loop gain and phase matching
between the two channels. Shown in Figure 3 is a single-
supply interface circuit for an AC-coupled input signal.
With the ADS807 set to the 2Vp-p input range, the top and
bottom references (REFT, REFB) provide an output voltage
of +3.0V and +2.0V, respectively. The CM output of the
ADS807 is used to bias the inputs of the driving amplifiers.
Using the OPA2681 on a single +5V supply, its ideal
common-mode point is +2.5V, which coincides with the
recommended common-mode input level for the ADS807,
thus obviating the need for coupling capacitors between the
amplifiers and the converter.
The addition of a small series resistor (R
S
) between the
output of the op amps and the input of the ADS807 will be
beneficial in almost all interface configurations. It will
decouple the op amp’s output from the capacitive load and
avoid gain peaking, which can result in increased noise. For
best spurious and distortion performance, the resistor value
should be kept below 100
. Furthermore, the series resistor
in combination with the shunt capacitor, establishes a pas-
sive low-pass filter limiting the bandwidth for the wideband
noise thus improving the SNR. The spurious free dynamic
range of this single-supply front end is limited by the 2nd
harmonic distortion. An improvement of several dB may be
realized by adding a pull-down resistor (R
P
) at the output of
each amplifier. This pulls a DC bias current out of the output
stage of the amplifier. It is set to approximately 5mA in the
shown example, but will vary depending on the amplifier
used.
V
IN
ADS807E
100pF
IN
IN
402
1.82k
1.82k
16.5
200
402
402
REFB
100pF
0.1μF
0.1μF
A1
OPA642
OA2
REFT
1.82k
1.82k
16.5
FIGURE 2. AC-Coupled Differential Driver Interface with OPA642.
FIGURE 3. AC-Coupled, Differential Interface for Single-Supply Operation.
V
IN
ADS807E
68pF
IN
CM
IN
+5V
68pF
0.1μF
0.1μF
0.1μF
A1
A2
OPA2681
R
G
249
R
F
499
499
R
S
24.9
V
CM
= +2.5V
R
P
499
R
P
499
R
F
499
R
IN
249
R
S
24.9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS807E/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 53 MSPS SE/Diff imputs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS807E/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 53 MSPS SE/Diff imputs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS807EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 53 MSPS SE/Diff imputs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS808 | 制造商:BB 制造商全稱:BB 功能描述:12-Bit, 70MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS808Y/250 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 70MHz Sampling ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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