LTC1594 Linear Technology, LTC1594 Datasheet - Page 4

• Manufacturer Part Number: LTC1594
• Description: 4- and 8-Channel/ Micropower Sampling 12-Bit Serial I/O A/D Converters
• Manufacturer: Linear Technology

AC CHARACTERISTICS
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1594/LTC1598
SYMBOL
t
f
t
t
t
t
t
t
t
t
t
t
C
The
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: These devices are specified at 5V. Consult factory for 3V
specified devices (LTC1594L/LTC1598L).
Note 4: Increased leakage currents at elevated temperatures cause the S/H
to droop, therefore it is recommended that f
f
Note 5: V
CSADC and CSMUX pins are tied together during the test.
4
SMPL
SMPL(MAX)
CONV
dDO
dis
en
hDO
f
r
ON
OFF
OPEN
CLK
IN
1000
100
10
1
0.1
75kHz at 70 C and f
denotes specifications which apply over the full operating
Supply Current vs Sample Rate
T
V
V
f
CLK
A
CC
REF
CC
= 25 C
= 5V
= 320kHz
= 5V, V
= 5V
PARAMETER
Analog Input Sample Time
Maximum Sampling Frequency
Conversion Time
Delay Time, CLK to D
Delay Time, CS to D
Delay Time, CLK to D
Time Output Data Remains Valid After CLK
D
D
Enable Turn-On Time
Enable Turn-Off Time
Break-Before-Make Interval
Input Capacitance
SAMPLE FREQUENCY (kHz)
OUT
OUT
REF
1
Fall Time
Rise Time
= 5V and CLK = 320kHz unless otherwise specified.
CLK
10
1kHz at 25 C.
OUT
W
OUT
OUT
Hi-Z
1594/98 G01
Data Valid
Enabled
CLK
U
100
(Note 5)
160kHz at 85 C,
400
300
200
450
350
250
– 55
Supply Current vs Temperature
T
V
f
f
CLK
SMPL
A
CC
– 35
CONDITIONS
See Figure 1 in Applications Information
See Figure 1 in Applications Information
See Figure 1 in Applications Information
See Test Circuits
See Test Circuits
See Test Circuits
C
See Test Circuits
See Test Circuits
See Figure 1 in Applications Information
See Figure 2 in Applications Information
Analog Inputs On-Channel
Digital Input
= 25 C
LOAD
= V
= 320kHz
= 16.8kHz
–15
REF
= 100pF
= 5V
TEMPERATURE ( C)
5
25
Off-Channel
Note 6: Linearity error is specified between the actual end points of the
A/D transfer curve.
Note 7: Two on-chip diodes are tied to each reference and analog input
which will conduct for reference or analog input voltages one diode drop
below GND or one diode drop above V
bias of either diode for 4.5V V
reference or analog input does not exceed the supply voltage by more than
50mV, the output code will be correct. To achieve an absolute 0V to 5V
input voltage range, it will therefore require a minimum supply voltage of
4.950V over initial tolerance, temperature variations and loading.
Note 8: Recommended operating condition.
Note 9: Channel leakage current is measured after the channel selection.
45
65
85 105
1594/98 G02
125
95.0
94.0
93.5
93.0
92.0
94.5
92.5
CC
– 55
Reference Current vs Temperature
16.8
MIN
V
f
f
1.5
35
SMPL
CLK
CC
– 35
5.5V. This means that as long as the
CC
= V
= 320kHz
. This spec allows 50mV forward
= 16.8kHz
–15
REF
= 5V
TEMPERATURE ( C)
TYP
250
135
230
260
100
160
5
12
75
50
50
20
5
5
25
45
MAX
600
300
200
150
150
700
300
65
CLK Cycles
CLK Cycles
85 105
1594/98 G03
UNITS
kHz
125
ns
ns
ns
ns
ns
ns
ns
ns
ns
pF
pF
pF