没有合适的资源?快使用搜索试试~ 我知道了~
LT1794-芯片资料介绍.pdf
1.该资源内容由用户上传,如若侵权请联系客服进行举报
2.虚拟产品一经售出概不退款(资源遇到问题,请及时私信上传者)
2.虚拟产品一经售出概不退款(资源遇到问题,请及时私信上传者)
版权申诉
0 下载量 147 浏览量
2022-07-04
09:01:16
上传
评论
收藏 276KB PDF 举报
温馨提示
试读
20页
LT1794-芯片资料介绍.pdf
资源推荐
资源详情
资源评论
1
LT1794
Dual 500mA, 200MHz
xDSL Line Driver Amplifier
■
Exceeds All Requirements For Full Rate,
Downstream ADSL Line Drivers
■
±500mA Minimum I
OUT
■
±11.1V Output Swing, V
S
= ±12V, R
L
= 100Ω
■
±10.9V Output Swing, V
S
= ±12V, I
L
= 250mA
■
Low Distortion: –82dBc at 1MHz, 2V
P-P
Into 50Ω
■
Power Saving Adjustable Supply Current
■
Power Enhanced Small Footprint Packages:
20-Lead TSSOP and 20-Lead SW
■
200MHz Gain Bandwidth
■
500V/µs Slew Rate
■
Specified at ±15V, ±12V and ±5V
■
High Density ADSL Central Office Line Drivers
■
High Efficiency ADSL, HDSL2, G.lite,
SHDSL Line Drivers
■
Buffers
■
Test Equipment Amplifiers
■
Cable Drivers
The LT
®
1794 is a 500mA minimum output current, dual op
amp with outstanding distortion performance. The ampli-
fiers are gain-of-ten stable, but can be easily compensated
for lower gains. The extended output swing allows for
lower supply rails to reduce system power. Supply current
is set with an external resistor to optimize power dissipa-
tion. The LT1794 features balanced, high impedance in-
puts with low input bias current and input offset voltage.
Active termination is easily implemented for further sys-
tem power reduction. Short-circuit protection and thermal
shutdown insure the device’s ruggedness.
The outputs drive a 100Ω load to ±11.1V with ±12V
supplies, and ±10.9V with a 250mA load. The LT1794,
with its increased swing on lower supplies, can be used to
upgrade LT1795 line driver applications.
The LT1794 is available in the very small, thermally
enhanced, 20-lead TSSOP for maximum port density in
line driver applications. The 20-lead SW is also available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
High Efficiency ±12V Supply ADSL Central Office Line Driver
1794 TA01
+
–
1/2
LT1794
–IN
–
+
1/2
LT1794
+IN
12V
SHDN
–12V
12.7Ω
R
BIAS
24.9k
1:2*
110Ω
1000pF
110Ω
1k
1k
12.7Ω
SHDNREF
100Ω
*COILCRAFT X8390-A OR EQUIVALENT
I
SUPPLY
= 10mA PER AMPLIFIER
WITH R
BIAS
= 24.9k
•
•
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1794
ORDER PART
NUMBER
Supply Voltage (V
+
to V
–
) .................................... ±18V
Input Current ..................................................... ±10mA
Output Short-Circuit Duration (Note 2)........... Indefinite
Operating Temperature Range ............... –40°C to 85°C
LT1794CFE
LT1794IFE
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
= 3°C/W (Note 4)
Consult factory for parts specified with wider operating temperature ranges.
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
Specified Temperature Range (Note 3).. –40°C to 85°C
Junction Temperature.......................................... 150°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
(Note 1)
ORDER PART
NUMBER
LT1794CSW
LT1794ISW
1
2
3
4
5
6
7
8
9
10
TOP VIEW
SW PACKAGE
20-LEAD PLASTIC SO
20
19
18
17
16
15
14
13
12
11
NC
V
+
OUT
V
–
V
–
V
–
V
–
–IN
+IN
SHDN
NC
V
+
OUT
V
–
V
–
V
–
V
–
–IN
+IN
SHDNREF
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
V
–
NC
–IN
+IN
SHDN
SHDNREF
+IN
–IN
NC
V
–
V
–
NC
OUT
V
+
NC
NC
V
+
OUT
NC
V
–
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 150°C, θ
JA
= 40°C/W, θ
JC
= 3°C/W (Note 4)
UNDERSIDE METAL CONNECTED TO V
–
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full specified temperature range, otherwise specifications are at T
A
= 25°C.
V
CM
= 0V, pulse tested, ±5V ≤ V
S
≤ ±15V, V
SHDNREF
= 0V, R
BIAS
= 24.9k between V
+
and SHDN unless otherwise noted. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OS
Input Offset Voltage 15.0 mV
● 7.5 mV
Input Offset Voltage Matching 0.3 5.0 mV
● 7.5 mV
Input Offset Voltage Drift ● 10 µV/°C
I
OS
Input Offset Current 100 500 nA
● 800 nA
I
B
Input Bias Current ±0.1 ±4 µA
● ±6 µA
Input Bias Current Matching 100 500 nA
● 800 nA
e
n
Input Noise Voltage Density f = 10kHz 8 nV/√Hz
i
n
Input Noise Current Density f = 10kHz 0.8 pA/√Hz
R
IN
Input Resistance V
CM
= (V
+
– 2V) to (V
–
+ 2V) ● 550 MΩ
Differential 6.5 MΩ
3
LT1794
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
C
IN
Input Capacitance 3pF
Input Voltage Range (Positive) (Note 5) ● V
+
– 2 V
+
– 1 V
Input Voltage Range (Negative) (Note 5)
● V
–
+ 1 V
–
+ 2 V
CMRR Common Mode Rejection Ratio V
CM
= (V
+
– 2V) to (V
–
+ 2V) 74 83 dB
● 66 dB
PSRR Power Supply Rejection Ratio V
S
= ±4V to ±15V 74 88 dB
● 66 dB
A
VOL
Large-Signal Voltage Gain V
S
= ±15V, V
OUT
= ±13V, R
L
= 100Ω 70 82 dB
● 64 dB
V
S
= ±12V, V
OUT
= ±10V, R
L
= 40Ω 63 76 dB
● 57 dB
V
S
= ±5V, V
OUT
= ±3V, R
L
= 25Ω 60 70 dB
● 54 dB
V
OUT
Output Swing V
S
= ±15V, R
L
= 100Ω 13.8 14.0 ±V
● 13.6 ±V
V
S
= ±15V, I
L
= 250mA 13.6 13.9 ±V
● 13.4 ±V
V
S
= ±12V, R
L
= 100Ω 10.9 11.1 ±V
● 10.7 ±V
V
S
= ±12V, I
L
= 250mA 10.6 10.9 ±V
● 10.4 ±V
V
S
= ±5V, R
L
= 25Ω 3.7 4.0 ±V
● 3.5 ±V
V
S
= ±5V, I
L
= 250mA 3.6 3.9 ±V
● 3.4 ±V
I
OUT
Maximum Output Current V
S
= ±15V, R
L
= 1Ω 500 720 mA
I
S
Supply Current per Amplifier V
S
= ±15V, R
BIAS
= 24.9k (Note 6) 10 13 18 mA
● 820mA
V
S
= ±12V, R
BIAS
= 24.9k (Note 6) 8.0 10 13.5 mA
● 6.7 15.0 mA
V
S
= ±12V, R
BIAS
= 32.4k (Note 6) 8 mA
V
S
= ±12V, R
BIAS
= 43.2k (Note 6) 6 mA
V
S
= ±12V, R
BIAS
= 66.5k (Note 6) 4 mA
V
S
= ±5V, R
BIAS
= 24.9k (Note 6) 2.2 3.4 5.0 mA
● 1.8 5.8 mA
Supply Current in Shutdown V
SHDN
= 0.4V 0.1 1 mA
Output Leakage in Shutdown V
SHDN
= 0.4V 0.3 1 mA
Channel Separation V
S
= ±12V, V
OUT
= ±10V, R
L
= 40Ω 80 110 dB
● 77 dB
SR Slew Rate V
S
= ±15V, A
V
= –10, (Note 7) 300 600 V/µs
V
S
= ±5V, A
V
= –10, (Note 7) 100 200 V/µs
HD2 Differential 2nd Harmonic Distortion V
S
= ±12V, A
V
= 10, 2V
P-P
, R
L
= 50Ω, 1MHz –85 dBc
HD3 Differential 3rd Harmonic Distortion V
S
= ±12V, A
V
= 10, 2V
P-P
, R
L
= 50Ω, 1MHz –82 dBc
GBW Gain Bandwidth f = 1MHz 200 MHz
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full specified temperature range, otherwise specifications are at T
A
= 25°C.
V
CM
= 0V, pulse tested, ±5V ≤ V
S
≤ ±15V, V
SHDNREF
= 0V, R
BIAS
= 24.9k between V
+
and SHDN unless otherwise noted. (Note 3)
4
LT1794
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Applies to short circuits to ground only. A short circuit between
the output and either supply may permanently damage the part when
operated on supplies greater than ±10V.
Note 3: The LT1794C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet these
extended temperature limits, but is not tested at –40°C and 85°C. The
LT1794I is guaranteed to meet the extended temperature limits.
Note 4: Thermal resistance varies depending upon the amount of PC board
metal attached to the device. If the maximum dissipation of the package is
exceeded, the device will go into thermal shutdown and be protected.
Note 5: Guaranteed by the CMRR tests.
Note 6: R
BIAS
is connected between V
+
and the SHDN pin.
Note 7: Slew rate is measured at ±5V on a ±10V output signal while
operating on ±15V supplies and ±1V on a ±3V output signal while
operating on ±5V supplies.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Supply Current
vs Ambient Temperature
Input Common Mode Range
vs Supply Voltage
Input Bias Current
vs Ambient Temperature
SUPPLY VOLTAGE (±V)
2
V
–
COMMON MODE RANGE (V)
1.0
2.0
–2.0
4
6
810
1794 G02
12
–1.0
V
+
0.5
1.5
–1.5
–0.5
14
T
A
= 25°C
∆V
OS
> 1mV
TEMPERATURE (
°C)
–50
I
SUPPLY
PER AMPLIFIER (mA)
11
13
15
1794 G01
9
7
10
12
14
8
6
5
–30 –10 10 30 50 70 90
V
S
= ±12V
R
BIAS
= 24.9k TO SHDN
V
SHDNREF
= 0V
TEMPERATURE (°C)
–50
±I
BIAS
(nA)
120
160
200
50
1794 G03
80
40
100
140
180
60
20
0
–30
–10
10 30
70 90
V
S
= ±12V
I
S
PER AMPLIFIER = 10mA
Input Noise Spectral Density
Output Short-Circuit Current
vs Ambient Temperature
Output Saturation Voltage
vs Ambient Temperature
FREQUENCY (Hz)
1
INPUT VOLTAGE NOISE (V/VHz)
INPUT CURRENT NOISE (pA/VHz)
10
1 100 1k 10k
1794 G04
0.1
10
100
1
10
0.1
100
100k
e
n
i
n
T
A
= 25°C
V
S
= ±12V
I
S
PER AMPLIFIER = 10mA
TEMPERATURE (°C)
–50
600
I
SC
(mA)
620
660
680
700
800
740
–10
30
50
1794 G05
640
760
780
720
–30 10
70
90
V
S
= ±12V
I
S
PER AMPLIFIER = 10mA
SINKING
SOURCING
TEMPERATURE (°C)
–50
OUTPUT SATURATION VOLTAGE (V)
–0.5
10
1794 G06
1.0
–30 –10 30
0.5
V
–
V
+
–1.0
–1.5
1.5
50 70 90
V
S
= ±12V
R
L
= 100Ω
R
L
= 100Ω
I
LOAD
= 250mA
I
LOAD
= 250mA
剩余19页未读,继续阅读
资源评论
书博教育
- 粉丝: 1
- 资源: 2836
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功