參數(shù)資料
型號： LTC2217IUP
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
封裝： 9 X 9 MM, PLASTIC, MO-220WNJR, QFN-64
文件頁數(shù)： 13/32頁
文件大?。?/td> 1285K
代理商： LTC2217IUP
LTC2217
20
2217f
Figure 4 shows transformer coupling using a transmis-
sion line balun transformer. This type of transformer has
much better high-frequency response and balance than
ux coupled center-tap transformers. Coupling capacitors
are added at the ground and input primary terminals to
allow the secondary terminals to be biased at 1.575V.
Figure 5. DC Coupled Input with Differential Amplier
0.1
μF
AIN
+
AIN
–
4.7pF
2.2
μF
4.7pF
VCM
ANALOG
INPUT
0.1
μF
0.1
μF
5
Ω
25
Ω
25
Ω
5
Ω
10
Ω
10
Ω
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2
μF
2217 F04
LTC2217
5
Ω
Figure 4. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 100MHz to 250MHz
–
+
AIN
+
AIN
–
2.2
μF
12pF
VCM
ANALOG
INPUT
2217 F05
CM
AMPLIFIER = LTC6600-20,
LTC1993, ETC.
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
LTC2217
25
Ω
25
Ω
PGA
1.575V
SENSE
VCM
BUFFER
INTERNAL
ADC
REFERENCE
RANGE
SELECT
AND GAIN
CONTROL
2.5V
BANDGAP
REFERENCE
2.2
μF
TIE TO VDD TO USE
INTERNAL 2.5V
REFERENCE
OR INPUT AN
EXTERNAL 2.5V
REFERENCE
OR INPUT AN
EXTERNAL 1.25V
REFERENCE
2217 F06
Figure 6. Reference Circuit
reference, tie the SENSE pin to VDD. To use an external
reference, simply apply either a 1.25V or 2.5V reference
voltage to the SENSE input pin. Both 1.25V and 2.5V ap-
plied to SENSE will result in a full scale range of 2.75VP-P. A
1.575V output, VCM, is provided for a common mode bias
for input drive circuitry. An external bypass capacitor is
required for the VCM output. This provides a high frequency
low impedance path to ground for internal and external
circuitry. This is also the compensation capacitor for the
reference; which will not be stable without this capacitor.
The minimum value required for stability is 2.2μF.
Direct Coupled Circuits
Figure 5 demonstrates the use of a differential amplier to
convert a single ended input signal into a differential input
signal. The advantage of this method is that it provides
low frequency input response; however, the limited gain
bandwidth of any op amp or closed-loop amplier will de-
grade the ADC SFDR at high input frequencies. Additionally,
wideband op amps or differential ampliers tend to have
high noise. As a result, the SNR will be degraded unless
the noise bandwidth is limited prior to the ADC input.
Reference Operation
Figure 6 shows the LTC2217 reference circuitry consisting
of a 2.5V bandgap reference, a programmable gain ampli-
er and control circuit. The LTC2217 has three modes of
reference operation: Internal Reference, 1.25V external
reference or 2.5V external reference. To use the internal
APPLICATIONS INFORMATION
相關PDF資料
PDF描述
LTC2217IUP#TR 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
LTC2217CUP 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
LTC2217CUP#TR 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
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相關代理商/技術參數(shù)
參數(shù)描述
LTC2217IUP#PBF 制造商:Linear Technology 功能描述:IC ADC 16BIT 105MSPS LN 64-QFN 制造商:Linear Technology 功能描述:16BIT ADC 105MSPS L NOISE 64QFN 制造商:Linear Technology 功能描述:16BIT ADC, 105MSPS, L NOISE, 64QFN
LTC2217IUP#TRPBF 制造商:Linear Technology 功能描述:IC ADC 16BIT 105MSPS LN 64-QFN
LTC2217IUP-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 105Msps Low Noise ADC
LTC2217IUP-TR 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 105Msps Low Noise ADC
LTC2217IUP-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 105Msps Low Noise ADC
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