参数资料
| 型号： | LT1993CUD-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC DIFF AMP/ADC DRVR 16-QFN |
| 标准包装： | 121 |
| 放大器类型： | 差分 |
| 电路数： | 2 |
| 输出类型： | 差分 |
| 转换速率： | 1100 V/µs |
| -3db带宽： | 800MHz |
| 电流 - 输入偏压： | 5µA |
| 电压 - 输入偏移： | 1000µV |
| 电流 - 电源： | 100mA |
| 电流 - 输出 / 通道： | 45mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 5.5 V，±2 V ~ 2.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1322 (CN2011-ZH PDF) |
LT1993-2
17
19932fa
APPLICATIO S I FOR ATIO
WU
U
Output Common Mode Adjustment
The LT1993-2’s output common mode voltage is set by the
VOCM pin. It is a high-impedance input, capable of setting
the output common mode voltage anywhere in a range
from 1.1V to 3.6V. Bandwidth of the VOCM pin is typically
300MHz, so for applications where the VOCM pin is tied to
a DC bias voltage, a 0.1F capacitor at this pin is recom-
mended. For best distortion performance, the voltage at
the VOCM pin should be between 1.8V and 2.6V.
When interfacing with most ADCs, there is generally a
VOCM output pin that is at about half of the supply voltage
of the ADC. For 5V ADCs such as the LTC17XX family, this
VOCM output pin should be connected directly (with the
addition of a 0.1F capacitor) to the input VOCM pin of the
LT1993-2. For 3V ADCs such as the LTC22XX families,
the LT1993-2 will function properly using the 1.65V from
the ADC’s VCM reference pin, but improved Spurious Free
Dynamic Range (SFDR) and distortion performance can
be achieved by level-shifting the LTC22XX’s VCM reference
voltage up to at least 1.8V. This can be accomplished as
shown in Figure 10 by using a resistor divider between
the LTC22XX’s VCM output pin and VCC and then bypass-
ing the LT1993-2’s VOCM pin with a 0.1F capacitor. For a
common mode voltage above 1.9V, AC coupling capacitors
are recommended between the LT1993-2 and LTC22XX
ADCs because of the input voltage range constraints of
the ADC.
Large Output Voltage Swings
The LT1993-2 has been designed to provide the 3.2VP-P
output swing needed by the LTC1748 family of 14-bit
low-noise ADCs. This additional output swing improves
system SNR by up to 4dB. Typical performance curves
and AC specications have been included for these ap-
plications.
Input Bias Voltage and Bias Current
The input pins of the LT1993-2 are internally biased to
the voltage applied to the VOCM pin. No external biasing
resistors are needed, even for AC-coupled operation. The
input bias current is determined by the voltage difference
between the input common mode voltage and the VOCMpin
(which sets the output common mode voltage). At both
the positive and negative inputs, any voltage difference is
imposed across 200
Ω, generating an input bias current.
For example, if the inputs are tied to 2.5V with the VOCM
pin at 2.2V, then a total input bias current of 1.5mA will
ow into the LT1993-2’s +INA and +INB pins. Furthermore,
an additional input bias current totaling 1.5mA will ow
into the –INA and –INB inputs.
Application (Demo) Boards
The DC800A Demo Board has been created for stand-alone
evaluation of the LT1993-2 with either single-ended or
differential input and output signals. As shown, it accepts
a single-ended input and produces a single-ended output
so that the LT1993-2 can be evaluated using standard
laboratory test equipment. For more information on this
Demo Board, please refer to the Demo Board section of
this data sheet.
There are also additional demo boards available that
combine the LT1993-2 with a variety of different Linear
Technology ADCs. Please contact the factory for more
information on these demo boards.
19932 F10
IF IN
LT1993-2
–INA
–INB
VOCM
2
31
6
7
1
2
+INB
+INA
14
13
15
80.6
16
10
10
LTC22xx
0.1
F
0.1
F
+OUTFILTERED
–OUTFILTERED
AIN+
AIN–
4.02k
11k
1.9V
1.5V
3V
VCM
Figure 10. Level Shifting 3V ADC VCM Voltage for
Improved SFDR
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| LT1993IUD-10 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700MHz Low Distortion, Low Noise Differential Amplifi er/ADC Driver (AV = 10V/V) |
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