参数资料
| 型号： | LT1993CUD-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/20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
15
19932fa
APPLICATIO S I FOR ATIO
WU
U
Single-Ended to Differential Operation
The LT1993-2’s performance with single-ended inputs is
comparable to its performance with differential inputs.
This excellent single-ended performance is largely due
to the internal topology of the LT1993-2. Referring to
the block diagram, if the +INA and +INB pins are driven
with a single-ended signal (while –INA and –INB are tied
to AC ground), then the +OUT and –OUT pins are driven
differentially without any voltage swing needed from
amplier C. Single-ended to differential conversion using
more conventional topologies suffers from performance
limitations due to the common mode amplier.
Driving ADCs
The LT1993-2 has been specically designed to interface
directly with high speed Analog to Digital Converters
(ADCs). In general, these ADCs have differential inputs,
with an input impedance of 1k or higher. In addition, there
is generally some form of lowpass or bandpass ltering just
prior to the ADC to limit input noise at the ADC, thereby
improving system signal to noise ratio. Both the unltered
and ltered outputs of the LT1993-2 can easily drive the
high impedance inputs of these differential ADCs. If the
ltered outputs are used, then cutoff frequency and the
type of lter can be tailored for the specic application if
needed.
Wideband Applications
(Using the +OUT and –OUT Pins)
In applications where the full bandwidth of the LT1993-2
is desired, the unltered output pins (+OUT and –OUT)
should be used. They have a low output impedance;
therefore, gain is unaffected by output load. Capacitance
in excess of 5pF placed directly on the unltered outputs
results in additional peaking and reduced performance.
When driving an ADC directly, a small series resistance
is recommended between the LT1993-2’s outputs and
the ADC inputs (Figure 5). This resistance helps eliminate
any resonances associated with bond wire inductances of
either the ADC inputs or the LT1993-2’s outputs. A value
between 10
Ω and 25Ω gives excellent results.
Figure 3. Alternate Input Termination for Differential
50
Ω Input Impedance
Figure 4. Input Termination for Differential 50
Ω Input Impedance
with 6dB Additional Gain
19932 F02
IF IN–
IF IN+
LT1993-2
–INA
–INB
–OUT
+OUT
8
5
+INB
+INA
14
13
15
ZIN = 50
DIFFERENTIAL
16
67
19932 F04
0.1
F
LT1993-2
–INA
–INB
–OUT
+OUT
8
5
+INB
+INA
14
13
15
ZIN = 50
DIFFERENTIAL
1:4 TRANSFORMER
(MINI-CIRCUITS TCM4-19)
16
19932 F05
LT1993-2
–OUT
+OUT
8
5
10
TO 25
10
TO 25
ADC
Figure 5. Adding Small Series R at LT1993-2 Output
Filtered Applications
(Using the +OUTFILTERED and –OUTFILTERED Pins)
Filtering at the output of the LT1993-2 is often desired to
provide either anti-aliasing or improved signal to noise
ratio. To simplify this ltering, the LT1993-2 includes an
additional pair of differential outputs (+OUTFILTERED
and –OUTFILTERED) which incorporate an internal low-
pass lter network with a –3dB bandwidth of 175MHz
(Figure 6). These pins each have an output impedance
of 25
Ω. Internal capacitances are 12pF to VEE on each
ltered output, plus an additional 12pF capacitor con-
nected differentially between the two ltered outputs. This
resistor/capacitor combination creates ltered outputs
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