4
LTC1290
1290fe
AC CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. (Note 3)
LTC1290B/LTC1290C/LTC1290D
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fSCLK
Shift Clock Frequency
VCC = 5V (Note 6)
0
2.0
MHz
fACLK
A/D Clock Frequency
VCC = 5V (Note 6)
(Note 10)
4.0
MHz
tACC
Delay Time from CS
↓ to DOUT Data Valid
(Note 9)
2
ACLK
Cycles
tSMPL
Analog Input Sample Time
See Operating Sequence
7
SCLK
Cycles
tCONV
Conversion Time
See Operating Sequence
52
ACLK
Cycles
tCYC
Total Cycle Time
See Operating Sequence (Note 6)
12 SCLK +
Cycles
56 ACLK
tdDO
Delay Time, SCLK
↓ to DOUT Data Valid
See Test Circuits LTC1290BC, LTC1290CC
●
130
220
ns
LTC1290DC, LTC1290BI
LTC1290CI, LTC1290DI
LTC1290BM, LTC1290CM
●
180
270
ns
LTC1290DM
(OBSOLETE)
tdis
Delay Time, CS
↑ to DOUT Hi-Z
See Test Circuits
●
70
100
ns
ten
Delay Time, 2nd ACLK
↓ to DOUT Enabled
See Test Circuits
●
130
200
ns
thCS
Hold Time, CS After Last SCLK
↓
VCC = 5V (Note 6)
0
ns
thDI
Hold Time, DIN After SCLK
↑
VCC = 5V (Note 6)
50
ns
thDO
Time Output Data Remains Valid After SCLK
↓
50
ns
tf
DOUT Fall Time
See Test Circuits
●
65
130
ns
tr
DOUT Rise Time
See Test Circuits
●
25
50
ns
tsuDI
Setup Time, DIN Stable Before SCLK
↑
VCC = 5V (Note 6)
50
ns
tsuCS
Setup Time, CS
↓ Before Clocking in
(Notes 6, 9)
2 ACLK Cycles
First Address Bit
+ 100ns
tWHCS
CS High Time During Conversion
VCC = 5V (Note 6)
52
ACLK
Cycles
CIN
Input Capacitance
Analog Inputs On Channel
100
pF
Analog Inputs Off Channel
5
pF
Digital Inputs
5
pF