LTC1668
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDD = 5V, VSS = –5V, LADCOM = AGND = DGND = 0V, IOUTFS = 10mA.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Input
Reference Small-Signal Bandwidth
I
= 10mA, C
= 0.1µF
COMP1
20
kHz
FS
Power Supply
V
V
Positive Supply Voltage
Negative Supply Voltage
Positive Supply Current
Negative Supply Current
Power Dissipation
●
●
●
●
4.75
5
–5
3
5.25
–5.25
5
V
V
DD
SS
–4.75
I
I
I
I
= 10mA, f
= 10mA, f
= 10mA, f
= 25Msps, f
= 25Msps, f
= 25Msps, f
= 1MHz
= 1MHz
= 1MHz
mA
mA
DD
SS
FS
FS
CLK
CLK
CLK
OUT
OUT
OUT
33
40
P
I
I
●
●
180
85
mW
mW
DIS
FS
FS
= 1mA, f
= 25Msps, f
= 1MHz
CLK
OUT
Dynamic Performance (Differential Transformer Coupled Output, 50Ω Double Terminated, Unless Otherwise Noted)
f
t
t
Maximum Update Rate
Output Settling Time
Output Propagation Delay
Glitch Impulse
●
50
75
30
8
Msps
ns
CLOCK
S
To 0.1% FSR
ns
PD
Single Ended
Differential
15
5
pV-s
pV-s
t
t
Output Rise Time
Output Fall Time
Output Noise
4
4
ns
ns
r
f
i
I
I
= 10mA
= 1mA
50
30
pA/√Hz
pA/√Hz
NO
FS
FS
AC Linearity
SFDR
Spurious Free Dynamic Range
to Nyquist
f
= 25Msps, f
= 1MHz
CLK
OUT
0dB FS Output
78
87
87
86
80
dB
dB
dB
dB
–6dB FS Output
–12dB FS Output
–18dB FS Output
f
f
f
f
= 50Msps, f
= 50Msps, f
= 50Msps, f
= 50Msps, f
= 1MHz
84
80
77
65
dB
dB
dB
dB
CLK
CLK
CLK
CLK
OUT
OUT
OUT
OUT
= 2.5MHz
= 5MHz
= 20MHz
Spurious Free Dynamic Range
Within a Window
f
f
= 25Msps, f
= 50Msps, f
= 1MHz, 2MHz Span
= 5MHz, 4MHz Span
86
96
88
dB
dB
CLK
CLK
OUT
OUT
THD
Total Harmonic Distortion
f
f
= 25Msps, f
= 50Msps, f
= 1MHz
= 5MHz
–84
–76
–77
dB
dB
CLK
CLK
OUT
OUT
Digital Inputs
V
V
Digital High Input Voltage
Digital Low Input Voltage
Digital Input Current
Digital Input Capacitance
Input Setup Time
●
●
●
2.4
V
V
IH
IL
0.8
I
±10
µA
pF
ns
ns
ns
ns
IN
C
5
IN
t
t
t
t
●
●
●
●
8
4
5
8
DS
Input Hold Time
DH
Clock High Time
CLKH
CLKL
Clock Low Time
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
3