Datasheet

4
LTC1274/LTC1277
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
OZ
High-Z Output Leakage D11 to D0/8 V
OUT
= 0V to V
DD
, CS High ● ± 10 µA
C
OZ
High-Z Output Capacitance D11 to D0/8 CS High (Note 10) ● 15 pF
I
SOURCE
Output Source Current V
OUT
= 0V –10 mA
I
SINK
Output Sink Current V
OUT
= V
DD
10 mA
(Note 5)
DIGITAL I PUTS A D DIGITAL OUTPUTS
U
U
(Note 5)
POWER REQUIRE E TS
W
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
Positive Supply Voltage (Notes 11, 12) Unipolar and Bipolar Mode 4.75 5.25 V
V
LOGIC
Logic Supply (Notes 11,12) Unipolar and Bipolar Mode (LTC1277) 2.7 to 5.25 V
V
SS
Negative Supply Voltage (Note 11) Bipolar Mode Only – 2.45 – 5.25 V
I
DD
Positive Supply Current f
SAMPLE
= 100ksps ● 24 mA
NAP = 0V (LTC1277 Only)
● 180 320 µA
SLEEP = 0V
● 0.3 5 µA
I
SS
Negative Supply Current f
SAMPLE
= 100ksps, Bipolar Mode Only ● 40 70 µA
SLEEP = 0V
● 0.3 5 µA
P
DISS
Power Dissipation f
SAMPLE
= 100ksps ● 10 20 mW
NAP = 0V (LTC1277 Only)
● 0.9 1.8 mW
SLEEP = 0V (Unipolar/Bipolar)
● 25/50 µW
(Note 5) See Figures 13 to 17.
TI I G CHARACTERISTICS
W
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
SAMPLE(MAX)
Maximum Sampling Frequency (Note 11) ● 100 ksps
t
CONV
Conversion Time ● 68 µs
t
ACQ
Acquisition Time ● 0.35 2 µs
t
1
CS↓ to RD↓ Setup Time (Note 10) ● 0ns
t
2
CS↓ to CONVST↓ Setup Time (Note 10) ● 30 ns
t
3
NAP↑ to CONVST↓ Wake-Up Time (LTC1277 Only) (Note 11) 620 ns
t
4
CONVST Low Time (Note 13) ● 40 ns
t
5
CONVST↓ to BUSY↓ Delay C
L
= 100pF ● 70 150 ns
t
6
Data Ready Before BUSY↑ C
L
= 100pF ● 20 65 ns
t
7
Delay Between Conversions (Note 11) ● 0.35 2 µs
t
8
Wait Time RD↓ After BUSY↑ (Note 10) ● –20 ns
t
9
Data Access Time After RD↓ C
L
= 20pF (Note 10) 50 110 ns
● 140 ns
C
L
= 100pF 65 125 ns
● 170 ns
t
10
Bus Relinquish Time C
L
= 100pF 20 60 90 ns
● 20 100 ns
t
11
RD Low Time (Note 10) ● t
9
ns
t
12
CONVST High Time (Notes 10, 13) ● 40 ns
t
13
Aperture Delay of Sample-and-Hold 35 ns
t
14
SLEEP↑ to REFRDY↑ Wake-Up Time 10µF Bypass at V
REF
Pin 4.2 ms
4.7µF Bypass at V
REF
Pin 3.3 ms
t
15
HBEN↑ to High Byte Data Valid C
L
= 100pF (LTC1277 Only) ● 35 100 ns