MAX1279 Maxim Integrated Products, MAX1279 Datasheet - Page 4

• Manufacturer Part Number: MAX1279
• Description: (MAX1277 / MAX1279) 12-Bit ADCs
• Manufacturer: Maxim Integrated Products

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1.5Msps, Single-Supply, Low-Power, True-
Differential, 12-Bit ADCs with Internal Reference
TIMING CHARACTERISTICS
(V
T
Note 1: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and the offset
Note 2: No missing codes over temperature.
Note 3: Conversion time is defined as the number of clock cycles (16) multiplied by the clock period.
Note 4: At sample rates below 10ksps, the input full-linear bandwidth is reduced to 5kHz.
Note 5: The listed value of three SCLK cycles is given for full-speed continuous conversions. Acquisition time begins on the 14th ris-
Note 6: Undersampling at the maximum signal bandwidth requires the minimum jitter spec for SINAD performance.
Note 7: 1.5Msps operation guaranteed for V
Note 8: Digital supply current is measured with the V
Figure 1. Detailed Serial-Interface Timing
4
A
SCLK Pulse-Width High
SCLK Pulse-Width Low
SCLK Rise to DOUT Transition
DOUT Remains Valid After SCLK
CNVST Fall to SCLK Fall
CNVST Pulse Width
Power-Up Time; Full Power-Down
Restart Time; Partial Power-Down
CNVST
DD
DOUT
SCLK
= +25°C.)
_______________________________________________________________________________________
= +2.7V to +3.6V, V
error have been nulled.
ing edge of SCLK and terminates on the next falling edge of CNVST. The IC idles in acquisition mode between conversions.
speeds for V
t
SETUP
PARAMETER
L
< 2.7V.
L
t
CL
= V
t
DHOLD
t
t
CH
DOUT
DD
, f
SCLK
SYMBOL
t
t
t
PWR-UP
DHOLD
t
SETUP
t
DOUT
t
CSW
= 24MHz, 50% duty cycle, T
t
t
RCV
CH
CL
L
> 2.7V. See the Typical Operating Characteristics section for recommended sampling
V
V
(Note 7)
V
V
(Note 7)
C
C
V
V
V
L
L
L
L
L
L
L
L
L
= 2.7V to V
= 1.8V to V
= 2.7V to V
= 1.8V to V
= 1.8V to V
= 1.8V to V
= 1.8V to V
IH
= 30pF, V
= 30pF, V
t
CSW
level equal to V
L
L
DD
DD
DD
DD
DD
DD
DD
= 2.7V to V
= 1.8V to V
CONDITIONS
, minimum recommended
, minimum recommended
A
Figure 2. Load Circuits for Enable/Disable Times
L
= T
a) HIGH-Z TO V
DOUT
, and the V
AND V
MIN
6kΩ
DD
DD
OH
to T
TO HIGH-Z
OH
MAX
IL
, V
GND
level equal to GND.
OL
, unless otherwise noted. Typical values are at
TO V
OH
,
C
L
18.7
18.7
MIN
10
20
4
TYP
22.5
22.5
16
b) HIGH-Z TO V
DOUT
2
AND V
OL
6kΩ
TO HIGH-Z
MAX
17
24
OL
V
L
, V
C
GND
OH
L
TO V
UNITS
Cycles
ms
ns
ns
ns
ns
ns
ns
OL
,