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參數(shù)資料
| 型號： | ADS2807 |
| 英文描述： | Dual, 12-Bit, 50MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 雙通道，12位，50MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 377K |
| 代理商： | ADS2807 |
ADS2807
SBAS169B
11
www.ti.com
Figure 2 shows an example of such an interface circuit
specifically designed to maximize the dynamic performance.
The voltage feedback amplifier, OPA642, maintains an ex-
cellent distortion performance for input frequencies of up to
15MHz. The two amplifiers (A1, A2) are configured as an
inverting and noninverting gain stage to convert the input
signal from single-ended to differential. The nominal gain for
this stage is set to +2V/V. The outputs of the OPA642s are
AC-coupled to the converter
’
s differential inputs. This will
keep the distortion performance at its best since the signal
range stays within the linear region of the op amp and
sufficient headroom to the supply rails can be maintained.
Four resistors located between the top (REFT) and bottom
(REFB) reference shift the input signal to a common-mode
voltage of approximately +2.5V.
The interface circuit of Figure 2 can be modified to extend the
bandwidth to approximately 25MHz, by replacing the OPA642
with its decompensated version, the OPA643. The OPA643
provides the necessary slew rate for a low distortion front end
to the ADS2807. With a minimum gain stability of +3, the gain
resistors have to be modified, as well as optimizing the series
resistor and shunt capacitance at each of the converter
inputs.
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 ampli-
fier 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 ADS2807 set to the 2Vp-p input range, the top and
bottom references (REFT, REFB) provide an output voltage
FIGURE 2. AC-Coupled Differential Driver Interface with OPA642.
FIGURE 3. AC-Coupled, Differential Interface for Single-Supply Operation.
V
IN
1/2
ADS2807Y
100pF
IN
IN
402
1.82k
1.82k
16.5
200
402
402
REFB
100pF
0.1
μ
F
0.1
μ
F
A1
OPA642
A2
OPA642
REFT
1.82k
1.82k
16.5
One Channel of Two
V
IN
1/2
ADS2807Y
68pF
IN
CM
IN
+5V
68pF
0.1
μ
F
0.1
μ
F
0.1
μ
F
1/2
OPA2681
1/2
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
One Channel of Two
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS2807-EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS2807-EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS2807Y | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:12BIT ADC DUAL SMD 2807 HTQFP64 |
| ADS2807Y/1K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 50 MSPS Dual Int/Ext Ref 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 |
| ADS2807Y/1K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 50 MSPS Dual Int/Ext Ref 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 |
| ADS2807Y/250 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 50 MSPS Dual Int/Ext Ref 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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