Datasheet

MAX1270/MAX1271
Multirange, +5V, 8-Channel,
Serial 12-Bit ADCs
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5.0V ±5%; unipolar/bipolar range; external reference mode, V
REF
= +4.096V; 4.7µF at REF; external clock; f
CLK
= 2.0MHz,
50% duty cycle (MAX127_B); f
CLK
= 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
MAX127_A 6.6
External clock mode
(Note 8)
MAX127_B 6.0
Conversion Time t
CONV
Internal clock mode, Figure 9 6 7.7 11
µs
MAX127_A 100
External clock mode
MAX127_B 110
Throughput Rate
Internal clock mode 43
ksps
Bandgap Reference Startup Time
Power-up (Note 9)
200
µs
C
REF
= 4.7µF 8
Reference Buffer Settling Time
To 0.1mV, REF bypass
capacitor fully
discharged
C
REF
= 33µF 60
ms
DIGITAL INPUTS (DIN, SCLK, CS, and SHDN)
Input High Threshold Voltage V
IH
2.4 V
Input Low Threshold Voltage V
IL
0.8 V
Input Hysteresis V
HYS
0.2 V
Input Leakage Current I
IN
V
IN
= 0 to V
DD
-10
+10
µA
Input Capacitance C
IN
(Note 4) 15 pF
DIGITAL OUTPUTS (DOUT, SSTRB)
I
SINK
= 5mA 0.4
Output Voltage Low V
OL
I
SINK
= 16mA 0.4
V
Output Voltage High V
OH
I
SOURCE
= 0.5mA
V
DD -
0.5
V
Tri-State Leakage Current I
L
CS = V
DD
-10
+10
µA
Tri-State Output Capacitance C
OUT
CS = V
DD
(Note 4) 15 pF