19-2229; Rev 0; 10/01
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
General Description
The MAX1407/MAX1408/MAX1409/MAX1414 are low-
power, general-purpose, multichannel data-acquisition
systems (DAS). These devices are optimized for low-
power applications. All the devices operate from a sin-
gle +2.7V to +3.6V power supply and consume a
maximum of 1.15mA in Run mode and only 2.5µA in
Sleep mode.
The MAX1407/MAX1408/MAX1414 feature a differential
8:1 input multiplexer to the ADC, a programmable
three-state digital output, an output to shutdown an
external power supply, and a data ready output from
the ADC. The MAX1408 has eight auxiliary analog
inputs, while the MAX1407/MAX1414 include four auxil-
iary analog inputs and two 10-bit force/sense DACs.
The MAX1414 features a 50mV trip threshold for the
signal-detect comparator while the others have a 0mV
trip threshold. The MAX1409 is a 20-pin version of the
DAS family with a differential 4:1 input multiplexer to the
ADC, one auxiliary analog input, and one 10-bit
force/sense DAC.
The MAX1407/MAX1408/MAX1414 are available in
space-saving 28-pin SSOP packages, while the
MAX1409 is available in a 20-pin SSOP package.
Features
o
+2.7V to +3.6V Supply Voltage Range in Standby,
Idle, and Run Mode (Down to 1.8V in Sleep Mode)
o
1.15mA Run Mode Supply Current
o
2.5µA Sleep Mode Supply Current (Wake-Up, RTC,
and Voltage Monitor Active)
o
Multichannel 16-Bit Sigma-Delta ADC
±1.5 LSB (typ) Integral Nonlinearity
30Hz or 60Hz Continuous Conversion Rate
Buffered or Unbuffered Mode
Gain of +1/3, +1, or +2V/V
Unipolar or Bipolar Mode
On-Chip Offset Calibration
o
10-Bit Force/Sense DACs
o
Buffered 1.25V, 18ppm/°C (typ) Bandgap
Reference Output
o
SPI™/QSPI™ or MICROWIRE™-Compatible Serial
Interface
o
System Support Functions
RTC (Valid til 9999) and Alarm
High-Frequency PLL Clock Output (2.4576MHz)
+1.8V and +2.7V
RESET
and Power-Supply
Voltage Monitors
Signal Detect Comparator
Interrupt Generator (INT and
DRDY)
Three-State Digital Output
Wake-Up Circuitry
o
28-Pin SSOP (MAX1407/MAX1408/MAX1414),
20-Pin SSOP (MAX1409)
MAX1407/MAX1408/MAX1409/MAX1414
Applications
Medical Instruments
Industrial Control Systems
Portable Equipment
Data-Acquisition System
Automatic Testing
Robotics
Pin Configurations
TOP VIEW
FB2 1
DO 2
FB1 3
OUT1 4
IN0 5
REF 6
AGND 7
AV
DD
8
CPLL 9
WU1 10
WU2 11
RESET 12
IN1 13
IN2 14
28 OUT2
27 IN3
26 DV
DD
25 DGND
24
CS
23 SCLK
Ordering Information
PART
MAX1407CAI
MAX1408CAI
MAX1409CAP
MAX1414CAI
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SSOP
28 SSOP
20 SSOP
28 SSOP
MAX1407
MAX1414
22 DIN
21 DOUT
20 INT
19 CLKIN
18 CLKOUT
17 FOUT
16 DRDY
15 SHDN
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
MAX1407/MAX1408/MAX1409/MAX1414
ABSOLUTE MAXIMUM RATINGS
AV
DD
to AGND .........................................................-0.3V to +6V
AV
DD
to DV
DD
...................................................... -0.3V to +0.3V
Analog Inputs to AGND .........................-0.3V to +(AV
DD
+ 0.3V)
Digital Inputs to DGND.............................................-0.3V to +6V
Maximum Current Input Into Any Pin ..................................50mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW
28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW
DV
DD
to DGND.........................................................-0.3V to +6V
AGND to DGND.....................................................-0.3V to +0.3V
Analog Outputs to AGND ......................-0.3V to +(AV
DD
+ 0.3V)
Digital Outputs to DGND .......................-0.3V to +(AV
DD
+ 0.3V)
REF to AGND.........................................-0.3V to +(AV
DD
+ 0.3V)
Operating Temperature Range:
MAX14__CA_ ......................................................0°C to +70°C
MAX14__EA_ ...................................................-40°C to +85°C
Lead Temperature (soldering, 10s) ................................+300 °C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°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
(DV
DD
= AV
DD
= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AV
DD
, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ADC ACCURACY
Resolution (No Missing Codes)
RES
Unbuffered mode, Unipolar mode, gain = 1,
V
NEG
= 0.2V, fully differential input (Note 7)
Unbuffered mode, Unipolar mode, gain = 2,
V
NEG
= 0.625V, pseudo-differential input
Unbuffered mode, Bipolar mode, gain = 1,
V
NEG
= 0.625V, fully differential input
Buffered mode, Bipolar mode, gain = 2,
V
NEG
= 0.625V, fully differential input
Gain = 2
Unipolar
Output RMS Noise (Note 1)
Bipolar Mode
Offset Error
Offset Drift
Gain Error
Gain Drift
Excludes offset and reference errors
Excludes offset and reference errors
±1
Gain = 1
Gain = 1/3
Gain = 2
Gain = 1
Gain = 1/3
On-chip calibration removes this error
±0.5
±1
16
1.5
1.75
LSB
1.70
2.50
±5
±10
±30
±8
±16.5
±48.5
±1
% of FSR
µV/°C
% of FSR
ppm/°C
µV
RMS
3.5
Bits
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Integral Nonlinearity
INL
2
_______________________________________________________________________________________
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
ELECTRICAL CHARACTERISTICS (continued)
(DV
DD
= AV
DD
= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AV
DD
, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
PGA Gain
Power-Supply Rejection Ratio
Output Update Rate
Turn-On Time
SIGNAL DETECT COMPARATOR
Differential Input-Detection
Threshold Voltage
Common-Mode Input Voltage
Turn-On Time
ANALOG INPUTS
ADC gain = 1
Unipolar mode
Differential Input Voltage Range
Bipolar mode
Unbuffered
Buffered
Unbuffered
Buffered
Gain = 1, unipolar and buffered mode
FOUT = 2.4576MHz
Buffered mode
30Hz data rate
60Hz data rate
ADC gain = 2
ADC gain = 1/3
ADC gain = 1
ADC gain = 2
ADC gain = 1/3
Absolute Input Voltage Range
Common-Mode Input Voltage
Range
Common-Mode Rejection Ratio
Input Sampling Rate
Input Current
Input Capacitance
FORCE-SENSE DAC
(all measurements made with FB1(2) shorted to OUT1(2), unless otherwise noted).
(MAX1407/MAX1409/MAX1414 only)
Resolution
Differential Nonlinearity
Integral Nonlinearity
Offset Error
Offset Drift
Gain Error
Gain Drift
Line Regulation
Current into FB1(2)
Excludes offset and reference drift
Excludes offset and reference drift
10
190
±0.5
Guaranteed monotonic (Note 2)
(Note 2)
(Note 3)
±5
3.6
10
±1.0
±1.0
±20
Bits
LSB
LSB
mV
µV/°C
mV
ppm/°C
µV/V
nA
0
0
0
-V
REF
-V
REF/2
-AV
DD
-0.05
0.05
AGND
0.05
90
15.360
30.720
±0.5
15
V
REF
V
REF/2
AV
DD
V
REF
V
REF/2
AV
DD
AV
DD
1.40
AV
DD
1.40
V
V
dB
kHz
nA
pF
V
MAX1407/MAX1408/MAX1409
MAX1414
-10
44
0
10
0
50
10
56
0.8
mV
V
µs
SYMBOL
CONDITIONS
See
PGA Gain
section
Gain = 1, unipolar and buffered mode
Continuous
conversion
Excluding reference
RATE bit = 0
RATE bit = 1
MIN
TYP
1/3
1
2
70
30
60
50
dB
Hz
µs
V/V
MAX
UNITS
MAX1407/MAX1408/MAX1409/MAX1414
_______________________________________________________________________________________
3
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
MAX1407/MAX1408/MAX1409/MAX1414
ELECTRICAL CHARACTERISTICS (continued)
(DV
DD
= AV
DD
= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AV
DD
, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Output Slew Rate
SYMBOL
CONDITIONS
010hex to 3FFhex and 3FFhex to 010hex
code swing, R
L
= 12kΩ, C
L
= 200pF
To
±1/2
LSB (at 10-bit accuracy) of full-
scale with code transition from 010hex
to 3FFhex, R
L
= 12kΩ, C
L
= 200pF
MIN
TYP
18.0
MAX
UNITS
V/ms
Output Settling Time
Turn-On Time
OUT1, OUT2 Output Range
65
100
µs
µs
AV
DD
- 0.2
V
No Load (Note 4)
0.05
EXTERNAL REFERENCE
(internal reference powered down)
Input Voltage Range
Input Resistance
Input Current
INTERNAL REFERENCE
(AV
DD
= 3V, unless otherwise noted)
Output Voltage
Output Voltage Temperature
Coefficient
Output Short-Circuit Current
Line Regulation
Load Regulation
Noise Voltage
Power-Supply Rejection Ratio
Turn-On Time
µP RESET
Supply Voltage Range
RESET
Trip Threshold Low
Low AV
DD
Trip Threshold
RESET
Output Low Voltage
(Open-Drain Output)
V
TH
For valid
RESET
AV
DD
falling
Bit VM = 1
Bit VM = 0
1
1.800
2.70
2.70
1.865
2.75
2.75
3.6
1.930
2.80
2.80
0.4
V
V
V
V
e
OUT
∆V
REF
/∆V
DD
T
A
= +25°C
1.225
1.25
18
3.4
2.7<AV
DD
<3.6V
I
SOURCE
= 0µA to 500µA, T
A
= +25°C
I
SINK
= 0µA to 50µA, T
A
= +25°C
0.1Hz to 10Hz
10Hz to 10kHz
±100mV, f = 120Hz
40
400
70
3
80
1
2
1.275
V
ppm/°C
mA
µV/V
µV/µA
µVp-p
dB
ms
1.25 ±0.10
540
2.3
V
kΩ
µA
For Normal, Idle, and Standby modes,
AV
DD
falling
I
SINK
= 1mA, AV
DD
= 1.8V
4
_______________________________________________________________________________________
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
ELECTRICAL CHARACTERISTICS (continued)
(DV
DD
= AV
DD
= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AV
DD
, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
RESET
Output Leakage
Turn-On Time
CRYSTAL OSCILLATOR
Crystal Frequency
Crystal Load Capacitance
Oscillator Stability
Oscillator Startup Time
PLL
FOUT Frequency
Absolute Clock Jitter
Frequency Tolerance/Stability
FOUT Rise/Fall Time
Duty Cycle
DIGITAL INPUTS
(DIN, SCLK,
CS, WU1, WU2)
Input High Voltage
Input Low Voltage
Input Hysteresis
DIN, SCLK,
CS,
Input Current
WU1, WU2
Input Current
WU1, WU2
Pullup Current
Input Capacitance
DIGITAL OUTPUTS
(DOUT, FOUT,
INT, DRDY, SHDN,
D0)
DOUT, FOUT,
DRDY, INT
Output Low Voltage
DOUT, FOUT,
DRDY, INT,
SHDN
Output High Voltage
DOUT Three-State Leakage
DOUT Three-State Capacitance
SHDN
Output Low Voltage
(MAX1407/MAX1408/MAX1414
only)
I
SINK
= 1mA, DV
DD
= +1.8V to +3.6V
I
SINK
= 50µA, DV
DD
= +1.8V to +3.6V
V
OL
V
OH
I
SINK
= 1mA, DV
DD
= +1.8V to +3.6V
I
SOURCE
= 0.2mA, DV
DD
= +1.8V to +3.6V
0.8 x DV
DD
±0.01
15
0.4
0.04 x
DV
DD
V
±10
0.4
V
V
µA
pF
DV
DD
= +1.8V to +3.6V
DV
DD
= +1.8V to +3.6V
DV
DD
= +3V
V
IN
= 0 or V
IN
= DV
DD
V
IN
= AV
DD
V
IN
= 0
200
±0.01
0.01
10
10
±10
10
0.7 x
DV
DD
0.3 x
DV
DD
V
V
mV
µA
µA
µA
pF
AV
DD
= +3V
Cycle-to-cycle
Overtemperature excluding crystal,
T
A
= T
MIN
to T
MAX
Oversupply voltage, +2.7V< AV
DD
< +3.6V
20% to 80% waveform, C
L
= 30pF
40
2.4576
10
0
0
15
50
30
60
MHz
ns
ppm/°C
ppm/mV
ns
%
AV
DD
= +1.8V to +3.6V, excluding crystal
AV
DD
= +3V
32.768
6
0
1.5
kHz
pF
ppm/V
s
SYMBOL
CONDITIONS
AV
DD
> V
TH
,
RESET
deasserted
MIN
TYP
0.002
2
MAX
0.1
UNITS
µA
ms
MAX1407/MAX1408/MAX1409/MAX1414
_______________________________________________________________________________________
5
DSP 与 ARM 处理器
