LTC1277_15 Datasheet, PDF (4/20 Pages) Linear Technology – 12-Bit, 10mW, 100ksps ADCs with 1A Shutdown

LTC1274/LTC1277
U
U
DIGITAL I PUTS A D DIGITAL OUTPUTS (Note 5)
SYMBOL PARAMETER
CONDITIONS
I_OZ
High-Z Output Leakage D11 to D0/8
V_OUT = 0V to V_DD, CS High
C_OZ
High-Z Output Capacitance D11 to D0/8 CS High (Note 10)
I_SOURCE Output Source Current
V_OUT = 0V
I_SINK
Output Sink Current
V_OUT = V_DD
WU
POWER REQUIRE E TS ^{(Note 5)}
SYMBOL PARAMETER
CONDITIONS
V_DD
V_LOGIC
V_SS
I_DD
Positive Supply Voltage (Notes 11, 12)
Logic Supply (Notes 11,12)
Negative Supply Voltage (Note 11)
Positive Supply Current
Unipolar and Bipolar Mode
Unipolar and Bipolar Mode (LTC1277)
Bipolar Mode Only
f_SAMPLE = 100ksps
NAP = 0V (LTC1277 Only)
SLEEP = 0V
I_SS
Negative Supply Current
f_SAMPLE = 100ksps, Bipolar Mode Only
SLEEP = 0V
P_DISS Power Dissipation
f_SAMPLE = 100ksps
NAP = 0V (LTC1277 Only)
SLEEP = 0V (Unipolar/Bipolar)
WU
TI I G CHARACTERISTICS (Note 5) See Figures 13 to 17.
SYMBOL
f_SAMPLE(MAX)
t_CONV
t_ACQ
t₁
t₂
t₃
t₄
t₅
t₆
t₇
t₈
t₉
PARAMETER
Maximum Sampling Frequency
Conversion Time
Acquisition Time
CS↓ to RD↓ Setup Time
CS↓ to CONVST↓ Setup Time
NAP↑ to CONVST↓ Wake-Up Time
CONVST Low Time
CONVST↓ to BUSY↓ Delay
Data Ready Before BUSY↑
Delay Between Conversions
Wait Time RD↓ After BUSY↑
Data Access Time After RD↓
CONDITIONS
(Note 11)
(Note 10)
(Note 10)
(LTC1277 Only) (Note 11)
(Note 13)
C_L = 100pF
C_L = 100pF
(Note 11)
(Note 10)
C_L = 20pF (Note 10)
C_L = 100pF
t₁₀
Bus Relinquish Time
C_L = 100pF
t₁₁
RD Low Time
(Note 10)
t₁₂
CONVST High Time
(Notes 10, 13)
t₁₃
Aperture Delay of Sample-and-Hold
t₁₄
SLEEP↑ to REFRDY↑ Wake-Up Time 10µF Bypass at V_REF Pin
4.7µF Bypass at V_REF Pin
t₁₅
HBEN↑ to High Byte Data Valid
C_L = 100pF (LTC1277 Only)
4
MIN
●
●
TYP MAX UNITS
± 10
µA
15
pF
– 10
mA
10
mA
MIN TYP MAX
4.75
5.25
2.7 to 5.25
– 2.45
– 5.25
●
2
4
●
180 320
●
0.3
5
●
40
70
●
0.3
5
●
10
20
●
0.9
1.8
●
25/50
UNITS
V
V
V
mA
µA
µA
µA
µA
mW
mW
µW
MIN TYP MAX UNITS
● 100
ksps
●
6
8
µs
●
0.35
2
µs
●0
ns
● 30
ns
620
ns
● 40
ns
●
70
150
ns
● 20
65
ns
●
0.35
2
µs
● – 20
ns
50
110
ns
●
140
ns
65
125
ns
●
170
ns
20
60
90
ns
● 20
100
ns
● t₉
ns
● 40
ns
35
ns
4.2
ms
3.3
ms
●
35
100
ns