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
ANALOG INPUT
Track/Hold Acquisition Time 3 µs
Small-Signal Bandwidth
-3dB
rolloff
±10V or ±V
REF
range 5
MHz
±5V or ±V
REF
/2 range 2.5
0 to 10V or 0 to V
REF
range 2.5
0 to 5V or 0 to V
REF
/2 range 1.25
Input Voltage Range V
IN
Unipolar,
Table 3
MAX127
0 10
V
0 5
MAX128
0 V
REF
0 V
REF
/2
Bipolar,
Table 3
MAX127
-10 +10
-5 +5
MAX128
-V
REF
V
REF
-V
REF
/2 V
REF
/2
Input Current I
IN
Unipolar
MAX127
0 to 10V range -10 +720
µA
0 to 5V range -10 +360
MAX128 -10 +0.1 +10
Bipolar
MAX127
±10V range -1200 +720
±5V range -600 +360
MAX128
±V
REF
range -1200 +10
±V
REF
/2 range -600 +10
Input Resistance ΔV
IN
/ΔI
IN
Unipolar 21
kΩ
Bipolar 16
Input Capacitance (Note 4) 40 pF
INTERNAL REFERENCE
REFOUT Voltage V
REF
T
A
= +25°C 4.076 4.096 4.116 V
REFOUT Tempco TC V
REF
MAX127_C/MAX128_C ±15
ppm/°C
MAX127_E/MAX128_E ±30
Output Short-Circuit Current 30 mA
Load Regulation (Note 5) 0 to 0.5mA output current 10 mV
Capacitive Bypass at REF 4.7 μF
REFADJ Output Voltage 2.465 2.500 2.535 V
REFADJ Adjustment Range Figure 12 ±1.5 %
Buffer Voltage Gain 1.638 V/V
MAX127/MAX128 Multirange, +5V, 12-Bit DAS with
2-Wire Serial Interface
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics (continued)