LTC6948-1 Просмотр технического описания (PDF) - Linear Technology
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LTC6948-1
Linear Technology
LTC6948-1 Datasheet PDF : 36 Pages
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LTC6948
Electrical Characteristics The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VREF+ = VD+ = VRF+ = 3.3V, VCP+ = VVCO+ = 5V unless otherwise
specified (Note 2). All voltages are with respect to GND.
SYMBOL
PARAMETER
VCLMP-LO
Low Clamp Voltage
VCLMP-HI
High Clamp Voltage
VMID
Mid-Supply Output Bias Ratio
Reference (R) Divider
R
Divide Range
VCO (N) Divider
N
Divide Range
Fractional ∆∑ Modulator
Numerator Range
Modulator LDO
Output Voltage
External Pin Capacitance
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 Figure 6 and Figure 7)
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
VD+ Supply Range
VRF+ Supply Range
VVCO+ Supply Range
VCP+ Supply Range
Power Supply Currents
IDD
VD+ Supply Current
ICC(5V)
Sum VCP+, VVCO+ Supply Currents
CONDITIONS
CPCLO = 1
CPCHI = 1, Referred to VCP+
Referred to (VCP+ – GND)
All Integers Included
l
All Integers Included, Integer Mode
l
All Integers Included, Fractional Mode
l
All Integers Included
l
LDO Enabled, Four Values
LDO Disabled
Required for LDO Stability
l
MUTE, CS, SDI, SCLK
l
MUTE, CS, SDI, SCLK
l
MUTE, CS, SDI, SCLK
MUTE, CS, SDI, SCLK
l
SDO and STAT, VOH = VD+ – 400mV
l
SDO and STAT, VOL = 400mV
l
l
l
l
l
l
l
l
To VIH/VIL/Hi-Z with 30pF Load
l
l
l
l
l
l
Digital Inputs at Supply Levels, Integer Mode l
Digital Inputs at Supply Levels, Fractional l
Mode, fPFD = 66.3MHz, LDOV[1:0] = 3
ICP = 11.2mA
l
ICP = 1.0mA
l
PDALL = 1
l
MIN
1
32
35
1
0.047
1.55
2.0
25
25
10
10
6
6
3.15
3.15
3.15
4.75
4.0
TYP
0.84
–0.96
0.48
MAX UNITS
V
V
V/V
31 Counts
1023 Counts
1019 Counts
262143 Counts
1.7 to 2.6
V
VD+
V
0.1
1
µF
V
0.8
V
250
mV
±1
µA
–3.3
–1.9
mA
3.4
mA
±1
µA
ns
ns
ns
ns
ns
ns
16
ns
3.3
3.45
V
3.3
3.45
V
3.3
3.45
V
5.0
5.25
V
5.25
V
1500
µA
18.2
22
mA
48
60
mA
26
35
mA
450
1000
µA
6948f
4
For more information www.linear.com/LTC6948
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