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参数资料
| 型号： | LTC6908CDCB-1#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC OSC SILICON 10MHZ 6-DFN |
| 标准包装： | 500 |
| 类型： | 振荡器 - 硅 |
| 频率： | 50kHz ~ 10MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 电源： | 1.25mA |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x3） |
| 安装类型： | 表面贴装 |
LTC6908-1/LTC6908-2
6
690812fa
BLOCK DIAGRA
W
OUT1
690812 BD
OUT2
V+
GND
SET
3
MOD 4
GND
2
6
1
5
COMPLEMENTARY
OR
QUADRATURE
OUTPUTS
MUTE OUTPUT
UNTIL STABLE
POR
1-POLE
LPF
0
90/180
DIVIDE BY
16/32/64
3-STATE
INPUT DECODER
DETECT
CLOCK INPUT
WHEN A CLOCK SIGNAL IS PRESENT AT THE
MOD INPUT, DISABLE THE MODULATION.
DIVIDER SELECT
PSEUDO RANDOM
CODE GENERATOR
–
+
GAIN = 1
V+ – V(SET)
≈ 1.13V
fMASTER = 20MHz 10k
fOUT = fMASTER/2
= 20MHz 10k/RSET
V+ – V(SET)
MASTER
OSCILLATOR
IMASTER
IREF
MDAC
CLK
2
A
2
A
VBIAS
RSET
OUT
V
+
–
+
–
ISET =
RSET
V+ – V(SET)
PI FU CTIO S
UU
U
SET (Pin 1/Pin 3): Frequency-Setting Resistor Input. The
value of the resistor connected between this pin and V+
determines the oscillator frequency. The voltage on this pin
is held by the LTC6908 to approximately 1.1V below the
V+ voltage. For best performance, use a precision metal
lm resistor with a value between 20k and 400k and limit
the capacitance on this pin to less than 10pF.
V+ (Pin 2/Pin 1): Voltage Supply (2.7V ≤ V+ ≤ 5.5V). This
supply must be kept free from noise and ripple. It should
be bypassed directly to a ground plane with a 0.1F
capacitor.
GND (Pin 3/Pin 2): Ground. Should be tied to a ground
plane for best performance.
OUT1 (Pin 4/Pin 6), OUT2 (Pin 5/Pin 5): Oscillator Out-
puts. These pins can drive 5k and/or 10pF loads. Larger
loads may cause inaccuracies due to supply bounce at
high frequencies.
MOD (Pin 6/Pin 4): Modulation-Setting Input. This three-
state input selects among four modulation rate settings.
The MOD pin should be tied to ground for the fOUT/16
modulation rate. Floating the MOD pin selects the fOUT/32
modulation rate. The MOD pin should be tied to V+ for the
fOUT/64 modulation rate. Tying one of the outputs to the
MOD pin turns the modulation off. To detect a oating
MOD pin, the LTC6908 attempts to pull the pin toward
midsupply. This is realized with two internal current
sources, one tied to V+ and MOD and the other one tied
to ground and MOD. Therefore, driving the MOD pin high
requires sourcing approximately 2A. Likewise, driving the
MOD pin low requires sinking 2A. When the MOD pin is
oated, it must be bypassed by a 1nF capacitor to ground.
Any AC signal coupling to the MOD pin could potentially
be detected and stop the frequency modulation.
Exposed Pad (Pin 7/NA): Ground. The Exposed Pad must
be soldered to PCB.
(DCB Package/S6 Package)
(S6 Package Pin Numbers)
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| LTC6908CDCB-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation |
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