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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 14/19頁(yè) |
| 文件大?。?/td> | 377K |
| 代理商： | ADS2807 |
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ADS2807
SBAS169B
14
www.ti.com
IN
(see Figure 3) results in 2Vp-p on the output of the track-
and-hold. Likewise, 2Vp-p on the IN and 0Vp-p on the
IN
(see
Figure 4) results in 2Vp-p on the output of the track-and-hold.
Therefore, the reference voltages, REFT and REFB, are the
same for both differential and single-ended inputs, as shown
in Table I.
FIGURE 7. Example for an External Reference Driver Using the Dual, Single-Supply Op Amp, OPA2234.
USING EXTERNAL REFERENCES
For even more design flexibility, the internal reference can be
disabled and an external reference voltage used. Driving
both channels with an external reference offers the best
performance, as it allows the channels to maintain balance.
The utilization of an external reference may be considered
for applications requiring higher accuracy, improved tem-
perature performance, or a wide adjustment range of the
converter
’
s full-scale range. In multichannel applications, the
use of a common external reference has the benefit of
obtaining better matching and drift of the full-scale range
between converters. Figure 7 gives an example of an exter-
nal reference circuit using a single-supply, low-power, dual
op amp (OPA2234).
The external references can vary as long as the value of the
external top reference (REFT) stays within the range of
V
S
–
1.70V and REFB + 0.4V, and the external bottom
reference (REFB) stays within 1.70V and REFT
–
0.4V. Note
that the function of the range selector pin (SEL) is disabled
while the converter operates in external reference mode.
Setting the ADS2807 for external reference mode requires
the
INT/EXT
pin (pin 18) to be HIGH.
The logic level applied to the
INT/EXT
pin of the ADS2807
determines if the converter operates with either the built-in
reference or external reference voltages. Due to this function
pin having an internal 50k
pull-up resistor, the default
configuration is external reference mode. Grounding this pin
will activate the internal reference option.
The input track and hold amplifier is differential. A positive
1Vp-p on the IN and its compliment, a negative 1Vp-p, on the
INPUT
REFERENCE
IN (Pins-50, 63)
IN (Pins-51, 62) REFT
REFB
2Vp-p Differential
1Vp-p Times 2 Inputs
Internal
or External
2V to 3V
3V to 2V
+3V
+2V
2Vp-p Single-Ended
2Vp-p Times 1 Input
Internal
or External
1.5V to 3.5V
2.5V
DC
+3V
+2V
3Vp-p Differential
1.5Vp-p Times 2 Inputs
Internal
or External
1.75V to 3.35V
3.25V to 1.75V +3.25V +1.75V
3Vp-p Single-Ended
3Vp-p Times 1 Input
Internal
or External
1V to 4V
2.5V
DC
+3.25V +1.75V
TABLE I. Reference Voltages for Input Signal Ranges.
The external references may be changed for different tasks.
The ADS2807 will follow the external references with a
latency of 8 to 10 clock cycles. If it is desired to use
INT/EXT
and SEL to change the configuration of a circuit for different
tasks, a large amount of time must be allowed. This time
could be hundreds of microseconds. Refer to the Diagram on
the front page. Note that there is no disconnect for external
references. If it is desired to switch between internal and
external references, disconnect switches must be added
between the external references and the ADS2807.
OPA2234
A1
OPA2234
A2
R
3
R
4
R
2
R
1
+5V
+5V
0.1
μ
F
10
μ
F
> 1.70V
< 3.30V
Top Reference
Bottom Reference
+
4.7k
REF1004
+2.5V
One Channel of Two
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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(píng)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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