参数资料
型号: LTC6420IUDC-20#PBF
厂商: Linear Technology
文件页数: 12/14页
文件大小: 0K
描述: IC DIFF AMP/ADC DRIVER DL 20QFN
标准包装: 91
类型: ADC 驱动器
应用: 数据采集
安装类型: 表面贴装
封装/外壳: 20-WFQFN 裸露焊盘
供应商设备封装: 20-QFN(3x4)
包装: 管件
LTC6420-20
7
642020fb
PIN FUNCTIONS
+INA, –INA, –INB, +INB (Pins 1, 2, 5, 6): Differential
Inputs of A and B channel respectively.
V(Pins 3, 4, 13, 14, 21):
Negative Power Supply. All
four pins, as well as the exposed back, must be connected
to same voltage/ground.
ENABLEA, ENABLEB (Pins 9, 18): Logic inputs. If low,
the amplier is enabled. If high, the amplier is disabled
and placed in a low power shutdown mode, making
the amplier outputs high impedance. These pins are
internally separate. These pins should not be left oating.
V+ A, V+ B (Pins 15, 20, 7, 12 ): Positive Power Supply
(Normallytiedto3Vor3.3V).SupplypinsofAandBchannels
are internally separate. Bypass each pin with 1000pF and
0.1μF capacitors as close to the pins as possible.
–OUTA, +OUTA, –OUTB, +OUTB (Pins 16, 17, 11, 10):
Differential Outputs of channels A and B respectively.
VOCMA, VOCMB (Pins 19, 8): These pins set the output
common mode voltage for the respective channel. They
are internally separate. A 0.1μF external bypass capacitor
is recommended.
Exposed Pad (Pin 21): V. The Exposed Pad must be
connected to same voltage/ground as pins 3, 4, 13, 14.
BLOCK DIAGRAM
640020 BD
7
V+ B
V + B
V + A
– OUTA
– OUTB
8
VOCMB
VOCMA
+INA
+
–INA
V–
ROUT
12.5Ω
ROUT
12.5Ω
RF
1000Ω
RG
100Ω
RF
1000Ω
RF
1000Ω
RF
1000Ω
10
V –
9
20
V + A
+OUTB
+OUTA
19
17
18
ENABLEA
ENABLEB
ROUT
12.5Ω
ROUT
12.5Ω
RG
100Ω
RG
100Ω
RG
100Ω
1
2
3
4
5
6
16
15
14
13
12
11
–INB
+INB
+
+
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