Datasheet

5
LTC1850/LTC1851
18501f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
SAMPLE(MAX)
Maximum Sampling Frequency ● 1.25 MHz
Acquisition + Conversion
● 800 ns
t
CONV
Conversion Time ● 650 ns
t
ACQ
Acquisition Time ● 150 ns
t
1
CS to RD Setup Time (Notes 9, 10) ● 0ns
t
2
CS to CONVST Setup Time (Notes 9, 10) ● 10 ns
t
3
CS to SHDN Setup Time (Notes 9, 10) 200 ns
t
4
SHDN to CONVST Wake-Up Time Nap Mode (Note 10) 200 ns
Sleep Mode, 10µF REFCOMP 10 ms
Bypass Capacitor (Note 10)
t
5
CONVST Low Time (Notes 10, 11) ● 50 ns
t
6
CONVST to BUSY Delay C
L
= 25pF 10 ns
● 60 ns
t
7
Data Ready Before BUSY 20 35 ns
● 15 ns
t
8
Delay Between Conversions (Note 10) ● 50 ns
t
9
Wait Time RD After BUSY ● –5 ns
t
10
Data Access Time After RD C
L
= 25pF 20 35 ns
● 45 ns
C
L
= 100pF 25 45 ns
● 60 ns
t
11
BUS Relinquish Time 10 30 ns
0°C to 70°C
● 35 ns
–40°C to 85°C
● 40 ns
t
12
RD Low Time ● t
10
ns
t
13
CONVST High Time (Note 10) ● 50 ns
t
14
Latch Setup Time (Notes 9, 10) ● 10 ns
t
15
Latch Hold Time (Notes 9, 10) ● 10 ns
t
16
WR Low Time (Note 10) ● 50 ns
The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
TI I G CHARACTERISTICS
UW
The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
POWER REQUIRE E TS
WU
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
Positive Supply Voltage (Note 10) ● 4.75 5.25 V
OV
DD
Output Positive Supply Voltage (Note 10) ● 2.7 5.25 V
I
DD
Positive Supply Current V
DD
= V
DD
= OV
DD
= 5V, ● 810mA
f
SAMPLE
= 1.25MHz
P
DISS
Power Dissipation ● 40 50 mW
Power Down Positive Supply Current
Nap Mode SHDN = 0V, CS = 0V 1 mA
Sleep Mode SHDN = 0V, CS = 5V 50 µA
Power Down Power Dissipation
Nap Mode SHDN = 0V, CS = 0V 5 mW
Sleep Mode SHDN = 0V, CS = 5V 0.25 mW