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參數(shù)資料
| 型號： | LTC2208CUP-14#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-Bit, 130Msps ADC; Package: QFN; No of Pins: 64; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| 封裝： | 9 X 9 MM, LEAD FREE, PLASTIC, MO-220WNJR-5, QFN-64 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 708K |
| 代理商： | LTC2208CUP-14#PBF |
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LTC2208-14
20
220814fb
Figure 4a 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 capaci-
tors are added at the ground and input primary terminals
to allow the secondary terminals to be biased at 1.25V.
Figure 4b shows the same circuit with components suit-
able for higher input frequencies.
Figure 5. DC Coupled Input with Differential Amplier
Figure 4a. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 100MHz to 250MHz
Figure 4b. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 250MHz to 500MHz
Reference Operation
Figure 6 shows the LTC2208-14 reference circuitry con-
sisting of a 2.5V bandgap reference, a programmable gain
amplier and control circuit. The LTC2208-14 has three
modes of reference operation: Internal Reference, 1.25V
external reference or 2.5V external reference. To use the
internal 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 applied to SENSE will result in a full scale range
of 2.25VP-P (PGA = 0). A 1.25V 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; it will not be
stable without this capacitor. The minimum value required
for stability is 2.2μF.
Figure 6. Reference Circuit
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.
0.1μF
AIN
+
AIN
–
4.7pF
2.2μF
4.7pF
VCM
LTC2208-14
ANALOG
INPUT
0.1μF
5Ω
10Ω
25Ω
5Ω
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2μF
220814 F04a
0.1μF
5Ω
25Ω
5Ω
AIN
+
AIN
–
2.2μF
2.2pF
VCM
LTC2208-14
ANALOG
INPUT
0.1μF
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2μF
220814 F04b
–
+
AIN
+
AIN
–
2.2μF
12pF
25Ω
VCM
LTC2208-14
ANALOG
INPUT
220814 F05
CM
AMPLIFIER = LTC6600-20,
LT1993, ETC.
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
PGA
1.25V
SENSE
VCM
BUFFER
INTERNAL
ADC
REFERENCE
RANGE
SELECT
AND GAIN
CONTROL
2.5V
BANDGAP
REFERENCE
2.2μF
TIE TO VDD TO USE
INTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 1.25V
REFERENCE
220814 F06
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