MAX127_ C_ _/MAX128_ C_ _..........................0°C to +70°C
MAX127_ E_ _/MAX128_ E_ _ ...................... -40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
PARAMETER
ACCURACY
(Note 1)
Resolution
Integral Nonlinearity
Differential Nonlinearity
(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.)
SYMBOL
CONDITIONS
MIN
12
INL
DNL
Unipolar
Offset Error
Bipolar
Channel-to-Channel Offset Error
Matching
Unipolar
Bipolar
Unipolar
Gain Error (Note 2)
Bipolar
Gain Tempco (Note 2)
Unipolar
Bipolar
MAX127A
MAX127B/MAX128B
MAX127A
MAX127B/MAX128B
3
5
MAX127A
MAX127B/MAX128B
MAX127A
MAX127B/MAX128B
±0.1
±0.3
±7
±10
±7
±10
ppm/°C
LSB
MAX127A
MAX127B/MAX128B
±1/2
±1
±1
±3
±5
±5
±10
LSB
LSB
TYP
MAX
UNITS
Bits
LSB
LSB
DYNAMIC SPECIFICATIONS
(800Hz sine-wave input, ±10V
P-P
(MAX127) or ±4.096V
P-P
(MAX128), f
SAMPLE
= 8ksps)
Signal-to-Noise Plus Distortion
Ratio
Total Harmonic Distortion
Spurious-Free Dynamic Range
Channel-to-Channel Crosstalk
Aperture Delay
Aperture Jitter
SINAD
THD
SFDR
4kHz, V
IN
= ±5V (Note 3)
DC, V
IN
= ±16.5V
Up to the 5th harmonic
81
-86
-96
200
10
70
-87
-80
dB
dB
dB
dB
ns
ns
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Maxim Integrated
│
2
MAX127/MAX128
Multirange, +5V, 12-Bit DAS with
2-Wire Serial Interface
Electrical Characteristics (continued)
(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
ANALOG INPUT
Track/Hold Acquisition Time
±10V or ±V
REF
range
Small-Signal Bandwidth
-3dB
rolloff
±5V or ±V
REF
/2 range
0 to 10V or 0 to V
REF
range
0 to 5V or 0 to V
REF
/2 range
Unipolar,
Table 3
Input Voltage Range
V
IN
Bipolar,
Table 3
MAX127
MAX128
MAX127
MAX128
Input Current
I
IN
Bipolar
MAX128
Unipolar
Bipolar
(Note 4)
V
REF
TC V
REF
T
A
= +25°C
MAX127_C/MAX128_C
MAX127_E/MAX128_E
0 to 0.5mA output current
4.7
2.465
Figure 12
2.500
±1.5
1.638
2.535
4.076
4.096
±15
±30
30
10
MAX127
±10V range
±5V range
±V
REF
range
±V
REF
/2 range
0 to 10V range
0 to 5V range
MAX127
MAX128
0
0
0
0
-10
-5
-V
REF
-V
REF
/2
-10
-10
-10
-1200
-600
-1200
-600
21
16
40
4.116
+0.1
5
2.5
2.5
1.25
10
5
V
REF
V
REF
/2
+10
+5
V
REF
V
REF
/2
+720
+360
+10
+720
+360
+10
+10
kΩ
pF
V
ppm/°C
mA
mV
μF
V
%
V/V
µA
V
MHz
3
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Unipolar
Input Resistance
Input Capacitance
INTERNAL REFERENCE
REFOUT Voltage
REFOUT Tempco
Output Short-Circuit Current
Load Regulation (Note 5)
Capacitive Bypass at REF
REFADJ Output Voltage
REFADJ Adjustment Range
Buffer Voltage Gain
ΔV
IN
/ΔI
IN
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Maxim Integrated
│
3
MAX127/MAX128
Multirange, +5V, 12-Bit DAS with
2-Wire Serial Interface
Electrical Characteristics (continued)
(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
Input Voltage Range
Input Current
V
REF
= 4.18V
Normal, or STANDBY
power-down mode
FULL power-down mode
10
5
V
DD
- 0.5
SYMBOL
CONDITIONS
MIN
2.4
TYP
MAX
4.18
400
1
kΩ
MΩ
V
UNITS
V
μA
REFERENCE INPUT
(buffer disabled, reference input applied to REF)
Input Resistance
REFADJ Threshold for
Buffer Disable
POWER REQUIREMENTS
Supply Voltage
V
DD
Normal or STANDBY power-down mode
FULL power-down mode
4.75
Normal mode, bipolar ranges
Normal mode, unipolar ranges
STANDBY power-down mode (Note 6)
FULL power-down mode
External reference = 4.096V
Internal reference
6
700
120
±0.1
±0.5
5.25
18
10
850
220
±0.5
V
mA
µA
LSB
Supply Current
I
DD
Power-Supply Rejection Ratio
(Note 7)
TIMING
External Clock Frequency Range
Conversion Time
Throughput Rate
Bandgap Reference
Startup Time
Reference Buffer Settling Time
PSRR
f
CLK
t
CONV
6.0
7.7
0.4
10.0
8
Power-up (Note 8)
To 0.1mV, REF bypass
capacitor fully discharged
C
REF
= 4.7μF
C
REF
= 33μF
200
8
60
2.4
0.8
V
IN
= 0V or V
DD
(Note 4)
0.2
±0.1
±10
15
MHz
µs
ksps
μs
ms
DIGITAL INPUTS
(SHDN, A2, A1, A0)
Input High Threshold Voltage
Input Low Threshold Voltage
Input Leakage Current
Input Capacitance
Input Hysteresis
V
IH
V
IL
I
IN
C
IN
V
HYS
V
V
µA
pF
V
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Maxim Integrated
│
4
MAX127/MAX128
Multirange, +5V, 12-Bit DAS with
2-Wire Serial Interface
Electrical Characteristics (continued)
(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
DIGITAL INPUTS
(SDA, SCL)
Input High Threshold Voltage
Input Low Threshold Voltage
Input Hysteresis
Input Leakage Current
Input Capacitance
DIGITAL OUTPUTS
(SDA)
Output Low Voltage
Three-State Output Capacitance
V
OL
C
OUT
I
SINK
= 3mA
I
SINK
= 6mA
(Note 4)
0.4
0.6
15
V
pF
V
IH
V
IL
V
HYS
I
IN
C
IN
V
IN
= 0V or V
DD
(Note 4)
0.3 x V
DD
0.05 x V
DD
±0.1
±10
15
0.7 x V
DD
V
V
V
µA
pF
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Timing Characteristics
(V
DD
= +4.75V to +5.25V; unipolar/bipolar range; external reference mode, V
1 Introduction
In the mid-1960s, American scientist Maas conducted extensive experimental research on the charging process of open-cell batteries and proposed an acceptable charging curve for ...[详细]
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