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| 型号： | LTC1992IMS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 21/42页 |
| 文件大小： | 0K |
| 描述： | IC AMP/DVR I/O FULLY DIFF 8-MSOP |
| 标准包装： | 2,500 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 差分，满摆幅 |
| 转换速率： | 1.5 V/µs |
| 增益带宽积： | 3.2MHz |
| 电流 - 输入偏压： | 2pA |
| 电压 - 输入偏移： | 250µV |
| 电流 - 电源： | 700µA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 11 V，±1.35 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
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LTC1992 Family
28
1992fb
Single-Ended to Differential Conversion
One of the most important applications of fully differential
amplifiers is single-ended signaling to differential signaling
conversion. Many systems have a single-ended signal that
must connect to an ADC with a differential input. The ADC
could be run in a single-ended manner, but performance
usually degrades. Fortunately, all of basic applications
circuits shown in Figure 4, as well as all of the fixed gain
LTC1992-X parts, are equally suitable for both differential
and single-ended input signals. For single-ended input
signals, connect one of the inputs to a reference voltage
(e.g., ground or mid-supply) and connect the other to
the signal path. There are no tradeoffs here as the part’s
performance is the same with single-ended or differential
input signals. Which input is used for the signal path only
affects the polarity of the differential output signal.
Signal Level Shifting
Another important application of fully differential ampli-
fier is signal level shifting. Single-ended to differential
conversion accompanied by a signal level shift is very
commonplace when driving ADCs. As noted in the theory of
operation section, fully differential amplifiers have a com-
mon mode level servo that determines the output common
mode level independent of the input common mode level.
To set the output common mode level, simply apply the
desired voltage to the VOCM input pin. The voltage range
on the VOCM pin is from (–VS + 0.5V) to (+VS – 1.3V).
Figure 3. Fully Differential Amplifier Signal Conventions (Ideal Amplifier and Perfect Resistor Matching is Assumed)
–
+
1992 F03
RIN
RFB
VOCM
RFB
B
–B
–VIN
–A
VINCM
VOUTCM
VINDIFF
4AVP-PDIFF
A
+VIN
2AVP-P
= VINDIFF = +VIN – –VIN
2BVP-P
DIFFERENTIAL
INPUT VOLTAGE
= VINCM =
INPUT COMMON
MODE VOLTAGE
+VOUT =
+ VOCM ; VOSCM = 0V
+VIN – –VIN
+VIN + –VIN
2
= VOUTDIFF = +VOUT – –VOUT
DIFFERENTIAL
OUTPUT VOLTAGE
–VOUT
+VOUT
LTC1992
VOUTDIFF
4BVP-PDIFF
1
2
RFB
RIN
= VOUTCM =
OUTPUT COMMON
MODE VOLTAGE
+VOUT + –VOUT
2
()
–VOUT =
+ VOCM ; VOSCM = 0V
–VIN – +VIN
1
2
RFB
RIN
VOUTDIFF = VINDIFF
RFB
RIN
rN ≈ (0.13nV/√Hz)
VAMPCM =
VINP + VINM
2
CMRR =
; +VIN = –VIN
ΔVAMPCM
ΔVAMPDIFF
OUTPUT BALANCE =
ΔVOUTCM
ΔVOUTDIFF
eNOUT =
WHERE: eNOUT = OUTPUT REFERRED NOISE VOLTAGE DENSITY
eNIN = INPUT REFERRED NOISE VOLTAGE DENSITY
(RESISTIVE NOISE IS ALREADY INCLUDED IN THE
SPECIFICATIONS FOR THE FIXED GAIN LTC1992-X PARTS)
+ 1
RFB
RIN
VOUTCM = VOCM
VAMPDIFF = VINP – VINM
VOSCM = VOUTCM – VOCM
()
VOSDIFFOUT = VOSDIFFIN
+ 1
RFB
RIN
()
INM
INP
RIN RFB
RIN + RFB
()
√eNIN2 + rN2
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