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參數(shù)資料
| 型號： | LT5514 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | ADC |
| 英文描述： | Ultralow Distortion IF Amplifier/ADC Driver with Digitally Controlled Gain |
| 中文描述： | 超低失真IF放大器/ ADC的數(shù)字控制增益驅(qū)動 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 275K |
| 代理商： | LT5514 |
11
LT5514
5514f
PIU
ENA (Pin 1):
Enable Pin for Amplifier A. When the input
voltage is higher than 3V, amplifier A is turned on. When
the input voltage is less than or equal to 0.6V, amplifier A
is turned off. This pin is internally pulled to ground if not
connected.
V
CC1
(Pin 2):
Power Supply. This pin is internally connected
to V
CC2
(Pin 19). Decoupling capacitors (1000pF and 0.1
μ
F
for example) may be required in some applications.
GND
(Pins 3, 4, 7, 8, 13, 14, 17, 18):
Ground.
IN
+
(Pin 5):
Positive Signal Input Pin with Internal DC
Bias.
IN
–
(Pin 6):
Negative Signal Input Pin with Internal DC
Bias.
PGA0 (Pin 9):
Amplifier PGA Control Input Pin for the
1.5dB Attenuation Step (see Programmable Gain table).
Input is high when input voltage is greater than 3V. Input
is low when input voltage is less than or equal to 0.6V. This
pin is internally pulled to ground if not connected.
PGA1 (Pin 10):
Amplifier PGA Control Input Pin for the
3dB Attenuation Step (see Programmable Gain table).
Input is high when input voltage is greater than 3V. Input
is low when input voltage is less than or equal to 0.6V. This
pin is internally pulled to ground if not connected.
PGA2 (Pin 11):
Amplifier PGA Control Input Pin for the
6dB Attenuation Step (see Programmable Gain table).
Input is high when input voltage is greater than 3V. Input
is low when input voltage is less than or equal to 0.6V. This
pin is internally pulled to ground if not connected.
PGA3 (Pin 12):
Amplifier PGA Control Input Pin for 12dB
Attenuation Step (see Programmable Gain table). Input is
high when input voltage is greater than 3V. Input is low
when input voltage is less than or equal to 0.6V. This pin
is internally pulled to ground if not connected.
OUT
+
(Pin 15):
Positive Amplifier Output. A transformer
with center tap tied to V
CC
or a choke inductor is recom-
mended to source the DC quiescent current.
OUT
–
(Pin 16):
Negative Amplifier Output. A transformer
with center tap tied to V
CC
or a choke inductor is recom-
mended to source the DC quiescent current.
V
CC2
(Pin 19):
Power Supply. This pin is internally con-
nected to V
CC1
(Pin 2).
ENB (Pin 20):
Enable Pin for Amplifier B. When the input
voltage is higher than 3V, amplifier B is turned on. When
the input voltage is less than or equal to 0.6V, amplifier B
is turned off. This pin is internally pulled to ground if not
connected.
Exposed Pad (Pin 21):
Ground. This pin must be soldered
to the printed circuit board ground plane for good heat
transfer.
BLOCK DIAGRA
AMPLIFIER A
OUT
+
AMPLIFIER B
1
15
OUT
–
16
20
ENABLE
CONTROL
ENA
21
5514 F01
ENB
9
10
GAIN CONTROL
LOGIC
ATTENUATOR
LT5514
PGA0
PGA1
11
12
PGA2
PGA3
19
2
6
5
VOLTAGE REGULATOR
AND BIAS
V
CC2
V
CC1
IN
+
IN
–
GND (3, 4, 7, 8
13, 14, 17, 18)
R
IN
100
Figure 1. Functional Block Diagram
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