Datasheet

3
LTC1274/LTC1277
(Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (Note 10) 4.75V ≤ V
DD
≤ 5.25V (Unipolar) ● 0 to 4.096 V
4.75V ≤ V
DD
≤ 5.25V, – 5.25V ≤ V
SS
≤ –2.45V (Bipolar) ● ±2.048 V
I
IN
Analog Input Leakage Current CS = High ● ±1 µA
C
IN
Analog Input Capacitance Between Conversions (Sample Mode) 45 pF
During Conversions (Hold Mode) 5 pF
PUT
U
IA
A
U
LOG
ACCURACY
IC
DY
U
W
A
(Notes 5, 9)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
S/(N + D) Signal-to-Noise 50kHz Input Signal 73 dB
Plus Distortion Ratio 100kHz Input Signal
● 70 72.5 dB
THD Total Harmonic Distortion 50kHz Input Signal – 84 dB
Up to 5th Harmonic 100kHz Input Signal
● –82 –76 dB
Peak Harmonic or 50kHz Input Signal – 84 dB
Spurious Noise 100kHz Input Signal
● –82 –76 dB
IMD Intermodulation Distortion fa = 96.95kHz, fb = 97.68kHz 2nd Order Terms – 78 dB
3rd Order Terms – 81 dB
Full Power Bandwidth 2 MHz
Full Linear Bandwidth 350 kHz
[S/(N + D) ≥ 68dB]
I TER AL REFERE CE CHARACTERISTICS
U
UU
(Note 5)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Output Voltage I
OUT
= 0 2.400 2.420 2.440 V
V
REF
Output Tempco I
OUT
= 0 ● ±10 ±45 ppm/°C
V
REF
Line Regulation 4.75V ≤ V
DD
≤ 5.25V 0.01 LSB/V
–5.25V ≤ V
SS
≤ –4.75V 0.01 LSB/V
V
REF
Load Regulation –5mA ≤ I
OUT
≤ 70µA 2 LSB/mA
(Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
DD
= 5.25V ● 2.4 V
V
IL
Low Level Input Voltage V
DD
= 4.75V ● 0.8 V
I
IN
Digital Input Current V
IN
= 0V to V
DD
● ±10 µA
C
IN
Digital Input Capacitance 5pF
V
OH
High Level Output Voltage, All Logic Outputs V
DD
= 4.75V
I
O
= – 10µA 4.70 V
I
O
= –200µA ● 4.0 V
V
LOGIC
= 2.7V (LTC1277)
I
O
= – 10µA 2.65 V
I
O
= –200µA 2.60 V
V
OL
Low Level Output Voltage, V
DD
= 4.75V
All Logic Outputs I
O
= 160µA 0.05 V
I
O
= 1.6mA ● 0.10 0.4 V
V
LOGIC
=2.7V (LTC1277)
I
O
= 160µA 0.05 V
I
O
= 1.6mA 0.10 V
DIGITAL I PUTS A D DIGITAL OUTPUTS
U
U