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參數(shù)資料
| 型號(hào)： | LT1819 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| 中文描述： | 1.3GHz的低噪聲，低失真差分ADC驅(qū)動(dòng)器為140MHz的中頻 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 232K |
| 代理商： | LT1819 |
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LTC6401-20
12
640120f
Output Common Mode Adjustment
The LTC6401-20’s output common mode voltage is set
by the V
OCM
pin, which is a high impedance input. The
output common mode voltage is capable of tracking V
OCM
in a range from 1V to 1.6V. Bandwidth of V
OCM
control is
typically 15MHz, which is dominated by a low pass filter
connected to the V
OCM
pin and is aimed to reduce com-
mon mode noise generation at the outputs. The internal
common mode feedback loop has a –3dB bandwidth
around 300MHz, allowing fast common mode rejection at
the outputs of the LTC6401-20. The V
OCM
pin should be
tied to a DC bias voltage where a 0.1μF bypass capacitor
is recommended. When interfacing with A/D converters
such as the LT22xx families, the V
OCM
can be normally
connected to the V
CM
pin of the ADC.
Driving A/D Converters
The LTC6401-20 has been specifically designed to inter-
face directly with high speed A/D converters. In Figure 7,
an example schematic shows the LTC6401-20 with a
single-ended input driving the LTC2208, which is a 16-bit,
130Msps ADC. Two external 10
Ω
resistors help eliminate
potential resonance associated with stray capacitance of
PCB traces and bond wire inductance of either the ADC
input or the driver output. V
OCM
of the LTC6401-20 is
connected to V
CM
of the LTC2208 at 1.25V. Alternatively,
a single-ended input signal can be converted to differential
signal via a balun and fed to the input of the LTC6401-20.
The balun also converts input impedance to match 50
Ω
source impedance.
Figure 7. Single-Ended Input to LTC6401-20 and LTC2208
APPLICATIONS INFORMATION
29
Ω
66.5
Ω
0.1
μ
F
640120 F07
LTC6401-20
V
OCM
ENABLE
IF IN
LTC2208
10
Ω
0.1
μ
F
LTC2208 130Msps
16-Bit ADC
1.25V
10
Ω
20dB GAIN
AIN
+
AIN
–
V
CM
–IN
+IN
+OUT
+OUTF
–OUTF
–OUT
Test Circuits
Due to the fully-differential design of the LTC6401 and
its usefulness in applications with differing characteristic
specifications, two test circuits are used to generate the
information in this datasheet. Test Circuit A is DC987B,
a two-port demonstration circuit for the LTC6401 family.
The schematic and silkscreen are shown below. This
circuit includes input and output transformers (baluns)
for single-ended-to-differential conversion and imped-
ance transformation, allowing direct hook-up to a 2-port
network analyzer. There are also series resistors at the
output to present the LTC6401 with a 375
Ω
differential
load, optimizing distortion performance. Due to the input
and output transformers, the –3dB bandwidth is reduced
from 1.3GHz to approximately 1.1GHz.
Test Circuit B uses a 4-port network analyzer to measure
S-parameters and gain/phase response. This removes the
effects of the wideband baluns and associated circuitry,
for a true picture of the >1GHz S-parameters and AC
characteristics.
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