Datasheet

(V
DD
= +5V ±5%; unipolar/bipolar range; external reference mode, V
REF
= 4.096V; 4.7μF at REF; external clock, f
CLK
= 400kHz;
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
REFERENCE INPUT (buffer disabled, reference input applied to REF)
Input Voltage Range 2.4 4.18 V
Input Current V
REF
= 4.18V
Normal, or STANDBY
power-down mode
400
μA
FULL power-down mode 1
Input Resistance
Normal or STANDBY power-down mode 10 kΩ
FULL power-down mode 5 MΩ
REFADJ Threshold for
Buffer Disable
V
DD
- 0.5 V
POWER REQUIREMENTS
Supply Voltage V
DD
4.75 5.25 V
Supply Current I
DD
Normal mode, bipolar ranges 18
mA
Normal mode, unipolar ranges 6 10
STANDBY power-down mode (Note 6) 700 850
µA
FULL power-down mode 120 220
Power-Supply Rejection Ratio
(Note 7)
PSRR
External reference = 4.096V ±0.1 ±0.5
LSB
Internal reference ±0.5
TIMING
External Clock Frequency Range f
CLK
0.4 MHz
Conversion Time t
CONV
6.0 7.7 10.0 µs
Throughput Rate 8 ksps
Bandgap Reference
Startup Time
Power-up (Note 8) 200 μs
Reference Buffer Settling Time
To 0.1mV, REF bypass
capacitor fully discharged
C
REF
= 4.7μF 8
ms
C
REF
= 33μF 60
DIGITAL INPUTS (SHDN, A2, A1, A0)
Input High Threshold Voltage V
IH
2.4 V
Input Low Threshold Voltage V
IL
0.8 V
Input Leakage Current I
IN
V
IN
= 0V or V
DD
±0.1 ±10 µA
Input Capacitance C
IN
(Note 4) 15 pF
Input Hysteresis V
HYS
0.2 V
MAX127/MAX128 Multirange, +5V, 12-Bit DAS with
2-Wire Serial Interface
www.maximintegrated.com
Maxim Integrated │ 4
Electrical Characteristics (continued)