Datasheet

4
LTC1666/LTC1667/LTC1668
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 5V, V
SS
= –5V, LADCOM = AGND = DGND = 0V, I
OUTFS
= 10mA.
ELECTRICAL CHARACTERISTICS
LTC1666/LTC1667/LTC1668
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Analog Output
I
OUTFS
Full-Scale Output Current ● 110mA
Output Compliance Range I
FS
= 10mA ● –1 1 V
Output Resistance; R
IOUT A
, R
IOUT B
I
OUT A, B
to LADCOM ● 0.7 1.1 1.5 kΩ
Output Capacitance 5pF
Reference Output
Reference Voltage REFOUT Tied to I
REFIN
Through 2kΩ 2.475 2.5 2.525 V
Reference Output Drift 25 ppm/°C
Reference Output Load Regulation I
LOAD
= 0mA to 5mA 6 mV/mA
Reference Input
Reference Small-Signal Bandwidth I
FS
= 10mA, C
COMP1
= 0.1µF 20 kHz
Power Supply
V
DD
Positive Supply Voltage ● 4.75 5 5.25 V
V
SS
Negative Supply Voltage ● –4.75 –5 –5.25 V
I
DD
Positive Supply Current I
FS
= 10mA, f
CLK
= 25Msps, f
OUT
= 1MHz ● 35mA
I
SS
Negative Supply Current I
FS
= 10mA, f
CLK
= 25Msps, f
OUT
= 1MHz ● 33 40 mA
P
DIS
Power Dissipation I
FS
= 10mA, f
CLK
= 25Msps, f
OUT
= 1MHz 180 mW
I
FS
= 1mA, f
CLK
= 25Msps, f
OUT
= 1MHz 85 mW
Dynamic Performance (Differential Transformer Coupled Output, 50Ω Double Terminated, Unless Otherwise Noted)
f
CLOCK
Maximum Update Rate ● 50 75 Msps
t
S
Output Settling Time To 0.1% FSR 20 ns
t
PD
Output Propagation Delay 8ns
Glitch Impulse Single Ended 15 pV-s
Differential 5 pV-s
t
r
Output Rise Time 4ns
t
f
Output Fall Time 4ns
i
NO
Output Noise 50 pA/√Hz
Digital Inputs
V
IH
Digital High Input Voltage ● 2.4 V
V
IL
Digital Low Input Voltage ● 0.8 V
I
IN
Digital Input Current ● ±10 µA
C
IN
Digital Input Capacitance 5pF
t
DS
Input Setup Time ● 8ns
t
DH
Input Hold Time ● 4ns
t
CLKH
Clock High Time ● 5ns
t
CLKL
Clock Low Time ● 8ns
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: For the LTC1666, ±1LSB = ±0.024% of full scale;
for the LTC1667, ±1LSB = ±0.006% of full scale = ±61ppm of full scale;
for the LTC1668, ±1LSB = ±0.0015% of full scale = ±15.3ppm of full scale.