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參數(shù)資料
| 型號(hào)： | ADS901E |
| 英文描述： | 10-Bit, 20MHz, #V Supply ANALOG-TO-DIGITAL CONVERTER |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 174K |
| 代理商： | ADS901E |
9
ADS901
R
1
1k
OPA680
V
IN
R
F
402
V
CM
C
0.1μF
0.1μF
IN
CM
+5V
R
S
50
+3V
R
G
402
C
0.1μF
402
22pF
ADS901
FIGURE 4. DC-Coupled Interface Circuit for +3V Single-Supply Operation.
dual supplies (OPA650, OPA658). The mid-point reference
voltage, V
CM
, biases the bipolar, ground-referenced input
signal. The capacitor C
1
and resistor R
1
form a high-pass
filter with the –3dB frequency set at
f
–3dB
= 1/(2
π
R
1
C
1
)
(2)
The values for C
1
and R
1
are not critical in most applications
and can be set freely. The values shown correspond to a
frequency of 1.6kHz.
Figure 3 depicts a circuit that can be used in single-supply
applications. The mid-reference voltage biases the op amp
up to the appropriate common-mode voltage, for example
V
CM
= +1.5V. With the use of capacitor C
G
the DC gain for
the non-inverting op amp input is set to +1V/V. As a result
the transfer function is modified to
V
OUT
= V
IN
{(1 + R
F
/R
G
) + V
CM
}
(3)
Again, the input coupling capacitor C
1
and resistor R
1
form
a high-pass filter. At the same time the input impedance is
defined by R
1
. Resistor R
S
isolates the op amp’s output from
the capacitive load to avoid gain peaking or even oscillation.
It can also be used to establish a defined bandwidth to reduce
the wideband noise. The recommended value is usually
between 10
and 100
.
DC-COUPLED INTERFACE CIRCUIT
Many systems are now requiring +3V single supply capabil-
ity of both the A/D converter and its driver. Figure 4 shows
an example for DC-coupled configuration operating solely
on a +3V supply voltage. The OPA632 provides excellent
performance in this demanding application. Its wide input
and output voltage ranges, an low distortion, supports the
ADS901 well. The OPA632 is configured for a gain of +2.
The 374
and 2.26k
resistors at the input level-shift V
IN
so that V
OUT
is within the allowed output voltage range
when V
IN
= 0. The input impedance of the driver circuit is
set to match to a 50
source impedance. The input level-
shifting was designed that V
IN
can be between 0V and 5V,
while delivering an output voltage of 1V to 2V into the
ADS901. Both the OPA632 and ADS901 have a power-
down function pin with the same polarity for those systems
the need to conserve power.
EXTERNAL REFERENCE
The ADS901 requires external references on pin 22 (REFT)
and 24 (REFB). Internally those pins are connected through a
resistor ladder, which has a nominal resistance of 4k
(
±
15%). In order to establish a correct voltage drop across the
ladder the external reference circuit must be able to typically
supply 250
μ
A of current. With this current the full-scale input
range of the ADS901 is set between +1V and +2V, or 1Vp-p.
In general, the voltage drop across REFT and REFB deter-
mines the input full-scale range (FSR) of the ADS901. Equa-
tion (4) can be used to calculate the span.
FSR = REFT - REFB
Depending on the application, several options are possible to
supply the external reference voltages to the ADS901 without
degrading the typical performance.
(4)
FIGURE 3. Interface Circuit. Example using the voltage feedback amplifier OPA680.
OPA632
V
IN
750
562
2.26k
374
22pF
+3V
100
Pwrdn
DIS
Disable
+3V
ADS901
10-Bit
20Msps
57.6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS901E | 制造商:Texas Instruments 功能描述:Analog-Digital Converter IC Number of Bi |
| ADS901E/1K | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 10-Bit 20 MSPS SE/Diff Input RoHS:否 制造商:Texas Instruments 輸入信號(hào)類(lèi)型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類(lèi)型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| ADS901E/1KG4 | 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 10-Bit 20 MSPS SE/Diff Input RoHS:否 制造商:Texas Instruments 輸入信號(hào)類(lèi)型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類(lèi)型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel |
| ADS901EG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 10-Bit 20 MSPS SE/Diff Input 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS902 | 制造商:BB 制造商全稱(chēng):BB 功能描述:10-Bit, 30MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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