LTC6945 查看數據表（PDF） - Linear Technology
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LTC6945 Datasheet PDF : 28 Pages
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LTC6945
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TC = 25°C. VREF+ = VREF0+ = VD+ = VRF+ = VVCO+ = 3.3V, VCP+ = 5V unless otherwise
specified. All voltages are with respect to GND.
SYMBOL PARAMETER
Reference (R) Divider
R
Divide Range
VCO (N) Divider
N
Divide Range
Digital Pin Specifications
VIH
VIL
VIHYS
High Level Input Voltage
Low Level Input Voltage
Input Voltage Hysteresis
Input Current
IOH
High Level Output Current
IOL
Low Level Output Current
SDO Hi-Z Current
Digital Timing Specifications (See Figures 8 and 9)
tCKH
SCLK High Time
tCKL
SCLK Low Time
tCSS
CS Setup Time
tCSH
CS High Time
tCS
SDI to SCLK Setup Time
tCH
SDI to SCLK Hold Time
tDO
SCLK to SDO Time
Power Supply Voltages
VREF+ Supply Range
VREFO+ Supply Range
VD+ Supply Range
VRF+ Supply Range
VVCO+ Supply Range
VCP+ Supply Range
Power Supply Currents
IDD
ICC(CP)
VD+ Supply Current
VCP+ Supply Current
ICC(REFO)
ICC
VREFO+ Supply Currents
Sum VREF+, VRF+, VVCO+ Supply
Currents
CONDITIONS
All Integers Included
All Integers Included
MUTE, CS, SDI, SCLK
MUTE, CS, SDI, SCLK
MUTE, CS, SDI, SCLK
MUTE, CS, SDI, SCLK
SDO and STAT, VOH = VD+ – 400mV
SDO and STAT, VOL = 400mV
To VIH/VIL/Hi-Z with 30pF Load
Digital Inputs at Supply Levels
ICP = 11.2mA
ICP = 1.0mA
PDALL = 1
REFO Enabled, RZ = ∞
RF Muted, OD[2:0] = 1
RF Enabled, RFO[1:0] =0, OD[2:0] = 1
RF Enabled, RFO[1:0] = 3, OD[2:0] = 1
RF Enabled, RFO[1:0] =3, OD[2:0] = 2
RF Enabled, RFO[1:0] =3, OD[2:0] = 3
RF Enabled, RFO[1:0] =3, OD[2:0] = 4 to 6
PDALL = 1
MIN TYP MAX
UNITS
l1
1023 Counts
l 32
65535 Counts
l 1.55
V
l
0.8
V
250
mV
l
±1
μA
l 1.4
2.3
mA
l 1.8
3.4
mA
l
±1
μA
l 25
l 25
l 10
l 10
l6
l6
l
ns
ns
ns
ns
ns
ns
16
ns
l 3.15
3.3
3.45
V
l 3.15
3.3
3.45
V
l 3.15
3.3
3.45
V
l 3.15
3.3
3.45
V
l 3.15
3.3
3.45
V
l 3.15
5.25
V
l
250
μA
l
33
37
mA
l
11
12.3
mA
l
235
385
μA
l
7.8
9.0
mA
l
68
75
mA
l
78
85
mA
l
87
95
mA
l
104
114
mA
l
110
121
mA
l
115
125
mA
l
202
396
μA
6945f
4
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