
4
LTC1278
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VDD
Positive Supply Voltage (Notes 10, 11)
Unipolar
4.95
5.25
V
Bipolar
4.75
5.25
V
VSS
Negative Supply Voltage (Note 10)
Bipolar Only
– 2.45
– 5.25
V
IDD
Positive Supply Current
fSAMPLE = 500ksps
q
15.0
29.5
mA
SHDN = 0V
q
1.7
3.0
mA
ISS
Negative Supply Current
fSAMPLE = 500ksps, VSS = – 5V
q
0.12
0.30
mA
PD
Power Dissipation
fSAMPLE = 500ksps
q
75.0
150
mW
SHDN = 0V
q
8.5
15
mW
(Note 5)
POWER REQUIRE E TS
W U
LTC1278-4/LTC1278-5
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fSAMPLE(MAX)
Maximum Sampling Frequency
LTC1278-4
q
400
kHz
LTC1278-5
q
500
tSAMPLE(MIN)
Minimum Throughput Time
LTC1278-4
q
2.5
s
(Acquisition Time Plus Conversion Time)
LTC1278-5
q
2.0
s
tCONV
Conversion Time
LTC1278-4
2.0
2.3
s
LTC1278-5
1.6
1.85
s
tACQ
Acquisition Time
200
ns
t1
CS
↓ to RD↓ Setup Time
(Notes 9, 10)
q
0ns
t2
CS
↓ to CONVST↓ Setup Time
(Notes 9, 10)
q
20
ns
t3
SHDN
↑ to CONVST↓ Wake-Up Time
(Note 10)
350
ns
t4
CONVST Low Time
(Notes 10, 12)
q
40
ns
t5
CONVST
↓ to BUSY↓ Delay
CL = 100pF
40
110
ns
Commercial
q
130
ns
Industrial
q
140
ns
t6
Data Ready Before BUSY
↑
CL = 100pF
q
20
40
ns
t7
Wait Time RD
↓ After BUSY↑
Mode 2, (see Figure 14) (Note 9)
q
–20
ns
t8
Data Access Time After RD
↓
CL = 20pF (Note 9)
50
90
ns
Commercial
q
110
ns
Industrial
q
120
ns
CL = 100pF
70
125
ns
Commercial
q
150
ns
Industrial
q
170
ns
t9
Bus Relinquish Time
20
30
75
ns
Commercial
q
20
85
ns
Industrial
q
20
90
ns
t10
RD Low Time
(Note 9)
q
t8
ns
t11
CONVST High Time
(Notes 9, 12)
q
40
ns
t12
Aperture Delay of Sample-and-Hold
Jitter < 50ps
15
ns
LTC1278-4/LTC1278-5
(Note 5)
TI I G CHARACTERISTICS
W U