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参数资料
| 型号： | LTC2204I |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| 封装： | 7 X7 MM, PLASTIC, MO-220, QFN-48 |
| 文件页数： | 15/28页 |
| 文件大小： | 804K |
| 代理商： | LTC2204I |
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LTC2205/LTC2204
22
22054p
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 capacitors
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 suitable for
higher input frequencies.
Figure 5. DC Coupled Input with Differential Amplier
0.1
F
AIN
+
AIN
–
4.7pF
2.2
F
4.7pF
VCM
LTC2205/
LTC2204
ANALOG
INPUT
0.1
F
0.1
F
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2
F
22054 F04a
25
10
200
200
10
25
Figure 4a. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 50MHz to 250MHz
0.1
F
AIN
+
AIN
–
2.2
F
2.2pF
VCM
LTC2205/
LTC2204
ANALOG
INPUT
0.1
F
0.1
F
T1
1:1
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
EXCEPT 2.2
F
22054 F04b
25
200
200
25
Figure 4b. Using a Transmission Line Balun Transformer.
Recommended for Input Frequencies from 250MHz to 500MHz
–
+
AIN
+
AIN
–
2.2
F
12pF
VCM
LTC2205/
LTC2204
ANALOG
INPUT
22054 F05
CM
AMPLIFIER = LTC6600-20,
LTC1993, ETC.
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
25
25
high noise. As a result, the SNR will be degraded unless
the noise bandwidth is limited prior to the ADC input.
PGA
1.25V
SENSE
VCM
BUFFER
INTERNAL
ADC
REFERENCE
RANGE
SELECT
AND GAIN
CONTROL
2.5V
BANDGAP
REFERENCE
2.2
F
TIE TO VDD TO USE
INTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 2.5V
REFERENCE
OR INPUT FOR
EXTERNAL 1.25V
REFERENCE
22054 F06
LTC2205/
LTC2204
Figure 6. Reference Circuit
APPLICATIO S I FOR ATIO
WU
U
Reference Operation
Figure 6 shows the LTC2205/LTC2204 reference circuitry
consisting of a 2.5V bandgap reference, a programmable
gain amplier and control circuit. The LTC2205/LTC2204
have three modes of reference operation: Internal Refer-
ence, 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
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
相关PDF资料 |
PDF描述 |
|---|---|
| LTC2205C#PBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2205I#PBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2205I#TRPBF | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2205I#TR | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
| LTC2205I | 1-CH 16-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2204IUK | 制造商:Linear Technology 功能描述:ADC Single Pipelined 40Msps 16-bit Parallel 48-Pin QFN EP 制造商:Linear Technology 功能描述:MS-ADC/High Speed, 16-bit, 40Msps ADC |
| LTC2204IUK#PBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 40Msps 16-bit Parallel 48-Pin QFN EP 制造商:Linear Technology 功能描述:Single ADC Pipelined 40Msps 16-bit Parallel 48-Pin QFN EP 制造商:Linear Technology 功能描述:IC ADC 16-BIT 40MSPS 48-QFN 制造商:Linear Technology 功能描述:ADC 16BIT 40MSPS 48QFN 制造商:Linear Technology 功能描述:ADC, 16BIT, 40MSPS, 48QFN 制造商:Linear Technology 功能描述:MS-ADC/High Speed, 16-bit, 40Msps ADC 制造商:Linear Technology 功能描述:IC, ADC, 16BIT, 40MSPS, QFN-48, Resolution (Bits):16bit, Sampling Rate:45MSPS, Supply Voltage Type:Single, Supply Voltage Min:3.135V, Supply Voltage Max:3.465V, Supply Current:145mA, Digital IC Case Style:QFN, No. of Pins:48 , RoHS Compliant: Yes |
| LTC2204IUK#TRPBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 40Msps 16-bit Parallel 48-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC ADC 16-BIT 40MSPS 48-QFN |
| LTC2204IUK-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 65Msps/40Msps |
| LTC2204IUK-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:16-Bit, 65Msps/40Msps |
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