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參數(shù)資料
| 型號(hào)： | ADS5421 |
| 英文描述： | PLUG, PCB, VERTICAL, 20WAY; Connector type:Wire-to-Board; Gender:Plug; Ways, No. of:20; Pitch, lead:1.27mm; Termination method:Solder; Material, contact:Phosphor Bronze; Plating, contact:Gold over Nickel; Rows, No. of:2; Pitch:0.05"; RoHS Compliant: Yes |
| 中文描述： | 14位，40MHz的采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 395K |
| 代理商： | ADS5421 |
ADS5421
SBAS237D
12
www.ti.com
Center Frequency (MHz)
3
0
–60
–65
–70
–75
–80
–85
5
10
15
20
25
30
35
40
45
50
4Vp-p
2Vp-p
FIGURE 7. Measured 2-Tone, 3rd-Order Distortion for a
Differential ADC Driver.
FIGURE 6. High Dynamic Range Interface Circuit with the OPA847 Set for a Gain of +8.5V/V.
ADS5421
47pF
IN
IN
CM
+5V
V
CM
1.7pF
OPA847
OPA847
850
50
Source
20
850
100
20
100
39pF
1.7pF
39pF
1:2
T
1
–5V
+5V
–5V
+5V
0.1
μ
F
V
CM
V
CM
< 6dB
Noise
Figure
AC-COUPLED, DIFFERENTIAL INTERFACE WITH
GAIN
The interface circuit example presented in Figure 6 employs
two OPA687s, (decompensated voltage-feedback op amps),
optimized for gains of 12V/V or higher. Implementing a new
compensation technique allows the OPA847s to operate with
a reduced signal gain of 8.5V/V, while maintaining the high
loop gain and the associated excellent distortion perfor-
mance offered by the decompensated architecture. For a
detailed discussion on this circuit and the compensation
scheme, refer to the OPA847 data sheet (SBOS251) located
at www.ti.com. Input transformer, T1, converts the single-
ended input signal to a differential signal required at the
inverting inputs of the amplifier, which are tuned to provide a
50
impedance match to an assumed 50
source. To
achieve the 50
input match at the primary of the 1:2
transformer, the secondary must see a 200
load imped-
ance. Both amplifiers are configured for the inverting mode
resulting in close gain and phase matching of the differential
signal. This technique, along with a highly symmetrical lay-
out, is instrumental in achieving a substantial reduction of the
2nd-harmonic, while retaining excellent 3rd-order perfor-
mance. A common-mode voltage, V
CM
, is applied to the
noninverting inputs of the OPA847. Additional series 20
resistors isolate the output of the op amps from the capaci-
tive load presented by the 40pF capacitors and the input
capacitance of the ADS5421. This 20
/47pF combination
sets a pole at approximately 85MHz and rolls off some of the
wideband noise resulting in a reduction of the noise floor.
For the measured 2-tone, 3rd-order distortion for the ampli-
fier portion of the circuit of Figure 6, see Figure 7. The upper
curve is for a total 2-tone envelope of 4Vp-p, requiring two
tones, each 2Vp-p across the OPA847 outputs. The lower
curve is for a 2Vp-p envelope, resulting in a 1Vp-p amplitude
per tone. The basic measurement dynamic range for the two
close-in spurious tones is approximately 85dBc. The 4Vp-p
test does not show measurable 3rd-order spurious until
25MHz, while the 2Vp-p is unmeasureable up to 40MHz
center frequency. 2-tone, 2nd-order intermodulation distor-
tion was unmeasureable for this circuit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS5421EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS5421 Evaluation Module 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 |
| ADS5421K5 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:14-Bit, 62MSPS Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421R | 制造商:BB 制造商全稱:BB 功能描述:14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421T | 制造商:BB 制造商全稱:BB 功能描述:14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS5421Y | 制造商:BB 制造商全稱:BB 功能描述:14-Bit, 40MHz Sampling ANALOG-TO-DIGITAL CONVERTER |
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