MAXIM MAX1407, MAX1408, MAX1409, MAX1414 Technical data
General Description
The MAX1407/MAX1408/MAX1409/MAX1414 are lowpower, general-purpose, multichannel data-acquisition
systems (DAS). These devices are optimized for lowpower applications. All the devices operate from a single +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 auxiliary 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.
Applications
Medical Instruments
Industrial Control Systems
Portable Equipment
Data-Acquisition System
Automatic Testing
Robotics
Features
♦ +2.7V to +3.6V Supply Voltage Range in Standby,
Idle, and Run Mode (Down to 1.8V in Sleep Mode)
♦ 1.15mA Run Mode Supply Current
♦ 2.5µA Sleep Mode Supply Current (Wake-Up, RTC,
and Voltage Monitor Active)
♦ 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
♦ 10-Bit Force/Sense DACs
♦ Buffered 1.25V, 18ppm/°C (typ) Bandgap
Reference Output
♦ SPI™/QSPI™ or MICROWIRE™-Compatible Serial
Interface
♦ 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
♦ 28-Pin SSOP (MAX1407/MAX1408/MAX1414),
20-Pin SSOP (MAX1409)
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
________________________________________________________________ Maxim Integrated Products 1
19-2229; Rev 0; 10/01
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.
Ordering Information
Pin Configurations
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.
TOP VIEW
FB2
FB1
OUT1
REF
AGND
AV
CPLL
WU1
WU2
RESET
1
2
DO
3
4
5
IN0
6
7
MAX1407
MAX1414
8
DD
9
10
11
12
13
IN1
14
IN2
28
OUT2
27
IN3
26
DV
DD
25
DGND
24
CS
23
SCLK
22
DIN
21
DOUT
20
INT
19
CLKIN
18
CLKOUT
17
FOUT
16
DRDY
15
SHDN
PART TEMP. RANGE PIN-PACKAGE
MAX1407CAI 0°C to +70°C 28 SSOP
MAX1408CAI 0°C to +70°C 28 SSOP
MAX1409CAP 0°C to +70°C 20 SSOP
MAX1414CAI 0°C to +70°C 28 SSOP
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
AVDDto AGND .........................................................-0.3V to +6V
AV
DD
to DVDD...................................................... -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
ELECTRICAL CHARACTERISTICS
(DVDD= AVDD= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AVDD, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
ADC ACCURACY
Resolution (No Missing Codes) RES 16 Bits
Integral Nonlinearity INL
Output RMS Noise (Note 1)
Offset Error On-chip calibration removes this error ±1 % of FS R
Offset Drift ±0.5 µV/°C
Gain Error Excludes offset and reference errors ±1 % of FS R
Gain Drift Excludes offset and reference errors ±1 p p m /° C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX U N I T S
Unbuffered mode, Unipolar mode, gain = 1,
V
NEG
U nb uffer ed m od e, U ni p ol ar m od e, g ai n = 2,
V
N E G
Unbuffered mode, Bipolar mode, gain = 1,
V
NEG
Buffered mode, Bipolar mode, gain = 2,
V
NEG
Unipolar
Bipolar Mode
= 0.2V, fully differential input (Note 7)
= 0.625V , p seud o- d i ffer enti al i np ut
= 0.625V, fully differential input
= 0.625V, fully differential input
1.5 3.5
1.75
1.70
2.50
Gain = 2 ±5
Gain = 1 ±10
Gain = 1/3 ±30
Gain = 2 ±8
Gain = 1 ±16.5
Gain = 1/3 ±48.5
LSB
µV
RMS
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(DVDD= AVDD= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AVDD, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
Power-Supply Rejection Ratio Gain = 1, unipolar and buffered mode 70 dB
Output Update Rate
Turn-On Time Excluding reference 50 µs
SIGNAL DETECT COMPARATOR
Differential Input-Detection
Threshold Voltage
Common-Mode Input Voltage
Turn-On Time 10 µs
ANALOG INPUTS
Differential Input Voltage Range
Absolute Input Voltage Range
Common-Mode Input Voltage
Range
Common-Mode Rejection Ratio Gain = 1, unipolar and buffered mode 90 dB
Input Sampling Rate FOUT = 2.4576MHz
Input Current Buffered mode ±0.5 nA
Input Capacitance 15 pF
F O R C E- SEN SE D A C ( al l m easur em ents m ad e w i th FB1( 2) shor ted to O U T1( 2) , unl ess other w i se noted ) .
( M AX 1407/M AX 1409/M AX 1414 onl y)
Resolution 10 Bits
Differential Nonlinearity Guaranteed monotonic (Note 2) ±1.0 LSB
Integral Nonlinearity (Note 2) ±1.0 LSB
Offset Error (Note 3) ±20 mV
Offset Drift ±5 µV/°C
Gain Error Excludes offset and reference drift 3.6 mV
Gain Drift Excludes offset and reference drift 10 ppm/°C
Line Regulation 190 µV/V
Current into FB1(2) ±0.5 nA
PARAMETER SYMBOL CONDITIONS MIN TYP MAX U N I T S
Continuous
conversion
MAX1407/MAX1408/MAX1409 -10 0 10
MAX1414 44 50 56
Unipolar mode
Bipolar mode
Unbuffered -0.05 AV
Buffered 0.05 1.40
Unbuffered AGND AV
Buffered 0.05 1.40
1/3
1PGA Gain See PGA Gain section
2
RATE bit = 0 30
RATE bit = 1 60
0 0.8 V
ADC gain = 1 0 V
ADC gain = 2 0 V
ADC gain = 1/3 0 AV
ADC gain = 1 -V
ADC gain = 2 -V
ADC gain = 1/3 -AV
30Hz data rate 15.360
60Hz data rate 30.720
REF
REF/2
DD
REF/2
V
V
REF/2
AV
REF
DD
REF
DD
DD
DD
kHz
V/V
Hz
mV
V
V
V
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(DVDD= AVDD= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AVDD, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
Output Slew Rate
Output Settling Time
Turn-On Time 100 µs
OUT1, OUT2 Output Range No Load (Note 4) 0.05
EXTERNAL REFERENCE (internal reference powered down)
Input Voltage Range 1.25 ±0.10 V
Input Resistance 540 kΩ
Input Current 2.3 µA
INTERNAL REFERENCE (AVDD = 3V, unless otherwise noted)
Output Voltage TA = +25°C 1.225 1.25 1.275 V
Output Voltage Temperature
Coefficient
Output Short-Circuit Current 3.4 mA
Line Regulation ∆V
Load Regulation
Noise Voltage e
Power-Supply Rejection Ratio ±100mV, f = 120Hz 70 dB
Turn-On Time 3ms
µP RESET
Supply Voltage Range For valid RESET 1 3.6 V
RESET Trip Threshold Low V
Low AVDD Trip Threshold
RESET Output Low Voltage
(Open-Drain Output)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX U N I T S
010hex to 3FFhex and 3FFhex to 010hex
cod e sw i ng , R
To ±1/2 LSB (at 10-bit accuracy) of fullscale with code transition from 010hex
to 3FFhex, R
/∆V DD2.7<AVDD<3.6V 80 µV/V
RE F
I
SOURCE
I
SINK
OUT
TH
0.1Hz to 10Hz 40
10Hz to 10kHz 400
AVDD falling
For Normal, Idle, and Standby modes,
AV
I
SINK
= 12kΩ , C L = 200p F
L
= 12kΩ, CL = 200pF
L
= 0µA to 500µA, TA = +25°C1
= 0µA to 50µA, TA = +25°C2
Bit VM = 1 1.800 1.865 1.930
Bit VM = 0 2.70 2.75 2.80
falling
DD
= 1mA, AVDD = 1.8V 0.4 V
2.70 2.75 2.80 V
18.0 V/ms
65 µs
AV
DD
- 0.2
18 p p m /° C
V
µV/µA
µVp-p
V
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
_______________________________________________________________________________________ 5
ELECTRICAL CHARACTERISTICS (continued)
(DVDD= AVDD= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AVDD, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
RESET Output Leakage AVDD > VTH, RESET deasserted 0.002 0.1 µA
Turn-On Time 2ms
CRYSTAL OSCILLATOR
Crystal Frequency AVDD = +3V 32.768 kHz
Crystal Load Capacitance 6pF
Oscillator Stability AV
Oscillator Startup Time 1.5 s
PLL
FOUT Frequency AVDD = +3V 2.4576 MHz
Absolute Clock Jitter Cycle-to-cycle 10 ns
Frequency Tolerance/Stability
FOUT Rise/Fall Time 20% to 80% waveform, CL = 30pF 15 30 ns
Duty Cycle 40 50 60 %
DIGITAL INPUTS (DIN, SCLK, CS, WU1, WU2)
Input High Voltage DVDD = +1.8V to +3.6V
Input Low Voltage DVDD = +1.8V to +3.6V
Input Hysteresis DVDD = +3V 200 mV
DIN, SCLK, CS, Input Current VIN = 0 or VIN = DV
WU1, WU2 Input Current VIN = AV
WU1, WU2 Pullup Current VIN = 0 10 µA
Input Capacitance 10 pF
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 ±0.01 ±10 µA
DOUT Three-State Capacitance 15 pF
SHDN Output Low Voltage
(MAX1407/MAX1408/MAX1414
only)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX U N I T S
D D
Overtemperature excluding crystal,
T
= T
A
Over supp l y vol tag e, + 2.7V < AV
V
OL
V
OH
I
SINK
I
SOURCE
I
SINK
I
SINK
= + 1.8V to + 3.6V , excl ud i ng cr ystal 0 ppm/V
to T
MIN
MAX
< +3.6V 0 p p m /m V
D D
0.7 x
DV
DD
DD
DD
= 1mA, DVDD = +1.8V to +3.6V 0.4 V
= 0.2mA, DVDD = +1.8V to +3.6V 0.8 x DV
= 1mA, DVDD = +1.8V to +3.6V 0.4
= 50µA, DVDD = +1.8V to +3.6V
0p p m /° C
0.3 x
DV
DD
±0.01 ±10 µA
0.01 10 µA
DD
0.04 x
DV
DD
V
V
V
V
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
6 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(DVDD= AVDD= +2.7V to 3.6V, 4.7µF at REF, internal V
REF
, 18nF between CPLL and AVDD, 32.768kHz crystal across CLKIN and
CLKOUT, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
TIMING CHARACTERISTICS
(MAX1407/MAX1408/MAX1409/MAX1414: AV
DD
= DV
DD
= 2.7V to 3.6V, TA = T
MIN
to T
MAX,
unless otherwise noted.)
D0 Output Low Voltage
(MAX1407/MAX1408/MAX1414
only)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX U N I T S
I
SINK
= 200µA, DVDD = +2.7V to +3.6V 0.7 mV
D0 Output High Voltage
(MAX1407/MAX1408/MAX1414
only)
POWER REQUIREMENTS
Supply Voltage Range V
Supply Current (Note 5) I
DD
DD
= 2m A, D V
I
S OU RC E
Run, Idle, and Standby mode 2.7 3.6
Sleep mode 1.8 3.6
Run mode
Standby mode
Sleep mode
V
= 2.7V
DD
= + 2.7V to + 3.6V
D D
MAX1407/MAX1414 1.15
MAX1408 1.03
MAX1409 1.09
MAX1407/MAX1414 650
MAX1408 530Idle mode
MAX1409 590
MAX1407/MAX1408/
MAX1409/MAX1414
MAX1407/MAX1408/
MAX1409/MAX1414
DV
- 0.1
DD
TIMING PARAMETERS
SCLK Operating Frequency f
SCLK Cycle Time t
SCLK Pulse Width High t
SCLK Pulse Width Low t
DIN to SCLK Setup t
DIN to SCLK Hold t
SCLK Fall to Output Data Valid t
CS Fall to Output Enable t
CS Rise to Output Disable t
CS to SCLK Rise Setup t
CS to SCLK Rise Hold t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SCLK
CYC
CSS
CSH
CH
CL
DS
DH
DO
DV
TR
CL = 50pF (see load circuit) 200 ns
CL = 50pF (see load circuit) 240 ns
CL = 50pF (see load circuit) 240 ns
476 ns
190 ns
190 ns
100 ns
0ns
100 ns
0ns
330
1.7 2.5
V
V
mA
µA
2.1 MHz
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
_______________________________________________________________________________________ 7
Note 1: Single conversion.
Note 2: DNL and INL are measured between code 010hex and 3FFhex.
Note 3: Offset error is referenced to code 010hex.
Note 4: Output swing is a function of external gain-setting feedback resistors and REF voltage.
Note 5: Measured with no load on FOUT, DOUT, and the DAC amplifiers. SCLK is idle, and all digital inputs are at DGND or DV
DD
.
Note 6: SHDN stays high if the PLL is on.
Note 7: Actual worst-case performance is ±2.5LSB. Guaranteed limit of ±3.5LSB is due to production test limitation.
Note 8: Guaranteed by design. Not production tested.
TIMING CHARACTERISTICS (continued)
(MAX1407/MAX1408/MAX1409/MAX1414: AV
DD
= DV
DD
= 2.7V to 3.6V, TA = T
MIN
to T
MAX,
unless otherwise noted.)
TYPICAL TIMING PARAMETERS
OUT1/OUT2 Turn-Off Time
Sleep Voltage Monitor Timeout
Period
WU1 or WU2 Pulse Width t
Shutdown Deassert Delay t
FOUT Turn-On Time t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
DSLP
WU
DPU
DFON
Input impedance > 1MΩ
(MAX1407/MAX1409/MAX1414 only)
The delay for the sleep voltage monitor
output, RESET, to go high after AV
above the reset threshold (+1.8V when bit
VM = 1 and +2.7V, when bit VM = 0); this is
largely driven by the startup of the 32kHz
oscillator
Minimum pulse width required to detect a
wake-up event
The delay for SHDN to go high after a valid
wake-up event
The turn-on time for the high-frequency
clock; it is gated by an AND function with
three signals—the RESET signal, the internal
low voltage V
assertion of the PLL; the time delay is timed
from when the low-voltage monitor trips or
the RESET going high, whichever happens
later; FOUT always starts in the low state
monitor signal, and the
DD
DD
rises
100 µs
1.54 s
1µs
1µs
31.25 ms
The delay for INT to go low after the FOUT
INT Delay t
FOUT Disable Delay t
SHDN Assertion Delay t
DFI
DFOF
DPD
clock output has been enabled; INT is used
as an interrupt signal to inform the µP the
high-frequency clock has started
The delay after a shutdown command has
asserted and before FOUT is disabled; this
gives the microcontroller time to clean up
and go into Sleep mode properly
The delay after a shutdown command has
asserted and before SHDN is pulled low
(turning off the DC-DC converter) (Note 6)
7.82 ms
1.95 ms
2.93 ms
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
8 _______________________________________________________________________________________
Typical Operating Characteristics
(A
VDD
= D
VDD
= 3V, MAX1407 used, TA = +25°C, unless otherwise noted.)
0
200
100
400
300
600
500
700
2.70 3.00 3.152.85 3.30 3.45 3.60
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX1407 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
RUN MODE
IDLE MODE
STANDBY
0
200
100
400
300
600
500
700
-40
10 35-15 60 85
SUPPLY CURRENT vs.
TEMPERATURE
MAX1407 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
STANDBY
IDLE MODE
RUN MODE
1.0
2.0
1.5
3.0
2.5
3.5
4.0
1.80 2.802.30 3.30
SLEEP CURRENT vs. FALLING V
DD
MAX1407 toc03
SUPLLY VOLTAGE (V)
SLEEP CURRENT (µA)
0
1.0
0.5
2.0
1.5
2.5
3.0
-40 10-15 35 60 85
SLEEP MODE SUPPLY CURRENT
vs. TEMPERATURE
MAX1407 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
Load Circuits
DV
DD
DV
DD
DOUT
6kΩ
DOUT
C
6kΩ
DGND
a) VOH TO HIGH-Z
LOAD
50pF
b) V
LOAD CIRCUITS FOR DISABLE TIME
TO HIGH-Z
OL
C
LOAD
50pF
DGND
6kΩ
DOUT
6kΩ
DGND
a) HIGH-Z TO VOH AND VOL TO V
LOAD CIRCUITS FOR ENABLE TIME
C
50pF
DOUT
LOAD
b) HIGH-Z TO VOL AND VOH TO V
OH
C
LOAD
50pF
DGND
OL
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
_______________________________________________________________________________________ 9
Typical Operating Characteristics (continued)
(A
VDD
= D
VDD
= 3V, MAX1407 used, TA = +25°C, unless otherwise noted.)
0
1
3
2
4
5
2.7 3.12.9 3.3 3.5
MAXIMUM INL vs. V
DD
(UNIPOLAR MODE, T = +25°C,
PSEUDO-DIFFERENTIAL INPUT)
MAX1407 toc05
VDD (V)
MAXIMUM INL (LSB)
A
B
A: GAIN = 1, UNBUFFERED MODE, 60sps
B: GAIN = 1, UNBUFFERED MODE, 30sps
0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
2.7 3.12.9 3.3 3.5
MAXIMUM INL vs. V
DD
(BIPOLAR MODE, T = +25°C,
FULLY DIFFERENTIAL INPUT)
MAX1407 toc06
VDD (V)
MAXIMUM INL (LSB)
A
B
A: GAIN = 2, BUFFERED MODE, 60sps
B: GAIN = 2, BUFFERED MODE, 30sps
0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
04020 60 80
MAXIMUM INL vs. TEMPERATURE
(UNIPOLAR MODE, V
DD
= 3V,
PSEUDO-DIFFERENTIAL INPUT)
MAX1407 toc07
TEMPERATURE (°C)
MAXIMUM INL (LSB)
A
B
A: GAIN = 1, UNBUFFERED MODE, 60sps
B: GAIN = 1, UNBUFFERED MODE, 30sps
0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
04020 60 80
MAXIMUM INL vs. TEMPERATURE
(BIPOLAR MODE, V
DD
= 3V,
FULLY DIFFERENTIAL INPUT)
MAX1407 toc08
TEMPERATURE (°C)
MAXIMUM INL (LSB)
A
B
A: GAIN = 2, BUFFERED MODE, 60sps
B: GAIN = 2, BUFFERED MODE, 30sps
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
10 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(A
VDD
= D
VDD
= 3V, MAX1407 used, TA = +25°C, unless otherwise noted.)
0
1.0
0.5
2.0
1.5
2.5
3.0
0.3 0.70.5 0.9 1.1
MAXIMUM INL vs. COMMON-MODE
INPUT VOLTAGE (BIPOLAR MODE,
BUFFERED MODE, V
DD
= 2.7V, 30sps,
FULLY DIFFERENTIAL INPUT, T = +25°C)
MAX1407 toc09
COMMON-MODE INPUT VOLTAGE (V)
MAXIMUM INL (LSB)
A: GAIN = 1
B: GAIN = 2
A
B
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-1.25 -0.75 -0.25 0.25 0.75 1.25
INL vs. FULLY DIFFERENTIAL
INPUT VOLTAGE (BIPOLAR MODE,
GAIN = 1, UNBUFFERED MODE,
V
CM
= 0.625V, VDD = 3V, T = +25°C)
MAX1407 toc10
DIFFERENTIAL INPUT VOLTAGE (V)
INL (LSB)
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
0 0.2 0.4 0.8 1.0
INL vs. PSEUDO-DIFFERENTIAL INPUT
VOLTAGE RANGE (UNIPOLAR MODE,
GAIN = 1, UNBUFFERED MODE,
V
NEG
= 0, VDD = 3V, T = +25°C)
MAX1407 toc11
DIFFERENTIAL VOLTAGE (V)
INL (LSB)
1.20.6
0
1.5
1.0
0.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
04020 60 80
UNCORRECTED OFFSET ERROR
vs. TEMPERATURE
(UNBUFFERED MODE, V
DD
= 3V)
MAX1407 toc12
TEMPERATURE (°C)
OFFSET ERROR (LSB)
A
B
A: GAIN = 1, UNIPOLAR MODE
B: GAIN = 2, BIPOLAR MODE
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
______________________________________________________________________________________ 11
REFERENCE
VOLTAGE
(V)
Typical Operating Characteristics (continued)
(A
VDD
= D
VDD
= 3V, MAX1407 used, TA = +25°C, unless otherwise noted.)
GAIN ERROR vs. TEMPERATURE
0.12
VDD = 3V
0.11
0.10
0.09
GAIN ERROR (%)
0.08
C
0.07
0.06
0
A: GAIN = 1, UNIPOLAR MODE, UNBUFFERED MODE
B: GAIN = 1, BIPOLAR MODE, UNBUFFERED MODE
C: GAIN = 2, UNIPOLAR MODE, BUFFERED MODE
D: GAIN = 2, BIPOLAR MODE, BUFFERED MODE
4020 60 80
TEMPERATURE (°C)
REFERENCE VOLTAGE vs.
SUPPLY VOLTAGE
1.24412
NO LOAD
1.24410
1.24408
1.24406
1.24404
1.24402
REFERENCE VOLTAGE (V)
1.24400
1.24398
2.70 3.00 3.152.85 3.30 3.45 3.60
SUPPLY VOLTAGE (V)
REFERENCE VOLTAGE vs.
TEMPERATURE
0.02
B
MAX1407 toc13
D
A
0
-0.02
-0.04
-0.06
% DEVIATION
-0.08
-0.10
-0.12
-40 10-15 35 60 85
TEMPERATURE (°C)
V
REF
= 0
I
REF
= 1.24406V
MAX1407 toc14
1.24410
1.24405
1.24400
1.24395
1.24390
1.24385
1.24380
DAC OFFSET ERROR vs.
TEMPERATURE
MAX1407 toc16
OFFSET ERROR (mV)
-3.4
IDLE MODE
-3.6
-3.8
-4.0
-4.2
-4.4
-4.6
-4.8
-5.0
-5.2
-40 10-15 35 60 85
TEMPERATURE (°C)
-4.400
-4.425
MAX1407 toc17
-4.450
-4.475
-4.500
-4.525
OFFSET ERROR (mV)
-4.550
-4.575
-4.600
REFERENCE VOLTAGE vs.
OUTPUT SOURCE CURRENT
MAX1407 toc15
0 400 600200 800 1000 1200
SOURCE CURRENT (µA)
DAC OFFSET ERROR vs.
SUPPLY VOLTAGE
IDLE MODE
MAX1407 toc18
2.70 3.002.85 3.15 3.30 3.45 3.60
SUPPLY VOLTAGE (V)
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
12 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(A
VDD
= D
VDD
= 3V, MAX1407 used, TA = +25°C, unless otherwise noted.)
-1.50
-1.20
-1.35
-0.60
-0.75
-1.05
0
-0.30
-0.45
0.15
-40 10-15 35 60 85
DAC GAIN ERROR vs.
TEMPERATURE
MAX1407 toc19
TEMPERATURE (°C)
GAIN ERROR (LSB)
-0.15
-0.90
IDLE MODE
INTERNAL REF USED
-0.20
-0.10
-0.15
0
-0.05
0.05
0.10
2.70 3.00 3.152.85 3.30 3.45 3.60
DAC GAIN ERROR vs.
SUPPLY VOLTAGE
MAX1407 toc20
SUPPLY VOLTAGE (V)
GAIN ERROR (LSB)
IDLE MODE
INTERNAL REF USED
-0.15
-0.05
-0.10
0.05
0
0.10
0.15
0 200 300 400100 500 600 700 800 9001000 1100
DAC INTEGRAL NONLINEARITY
vs. DIGITAL CODE (AV
DD
= 2.7V)
MAX1407 toc21
CODE
INL (LSB)
-0.15
-0.05
-0.10
0.05
0
0.10
0.15
0 200 300 400100 500 600 700 800 9001000 1100
DAC INTEGRAL NONLINEARITY
vs. DIGITAL CODE (AV
DD
= 3.6V)
MAX1407 toc22
CODE
INL (LSB)
-0.100
-0.075
0.075
-0.025
-0.050
0
0.025
0.050
0.100
0 200 300 400100 500 600 900800 1000700 1100
DAC DIFFERENTIAL NONLINEARITY
vs. DIGITAL CODE (AV
DD
= 2.7V)
MAX1407 toc23
CODE
DNL (LSB)
-0.100
-0.075
0.075
-0.025
-0.050
0
0.025
0.050
0.100
0 200 300 400100 500 600 900800 1000700 1100
DAC DIFFERENTIAL NONLINEARITY
vs. DIGITAL CODE (AV
DD
= 3.6V)
MAX1407 toc24
CODE
DNL (LSB)
DAC LARGE-SIGNAL OUTPUT
STEP RESPONSE
V
REF
= 1.25V, AVDD = 3.0V, RL = 0
MAX1407 toc25
OUT_
500mV/DIV
CS
2V/DIV
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
______________________________________________________________________________________ 13
Typical Operating Characteristics (continued)
(A
VDD
= D
VDD
= 3V, MAX1407 used, TA = +25°C, unless otherwise noted.)
1.2450
1.2445
1.2440
1.2435
1.2430
2.7 3.0 3.3 3.6
DAC OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX1407 toc26
SUPPLY VOLTAGE (V)
DAC OUTPUT VOLTAGE (V)
OUTPUT AT FULL SCALE
NO LOAD
DAC BUFFER IN UNITY GAIN
1.00
1.10
1.05
1.20
1.15
1.25
1.30
0231 456
DAC OUTPUT VOLTAGE
vs. SOURCE CURRENT
MAX1407 toc27
LOAD CURRENT (mA)
DAC OUTPUT VOLTAGE (V)
OUTPUT AT FULL SCALE
DAC BUFFER IN UNITY GAIN
015
10520253530
40
1.20
1.30
1.35
1.25
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
DAC OUTPUT VOLTAGE
vs. SINK CURRENT
MAX1407 toc28
SINK CURRENT (µA)
DAC OUTPUT VOLTAGE (V)
-0.15
-0.06
-0.09
-0.12
-0.03
0
0.03
0.06
0.09
0.12
0.15
-40 10-15 35 60 85
DAC OUTPUT VOLTAGE vs.
TEMPERATURE
MAX1407 toc29
TEMPERATURE (°C)
DAC OUTPUT VOLTAGE (%)
V
REF
= 1.24406V
I
REF
= 0
-0.25
-0.15
-0.20
-0.05
-0.10
0.05
0
0.10
-40 10-15 35 60 85
VOLTAGE MONITOR THRESHOLD
vs. TEMPERATURE
MAX1407 toc30
TEMPERATURE (°C)
% DEVIATION
V
1.8V_THRESHOLD
= 1.865V
V
2.7V_THRESHOLD
= 2.75V
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
14 ______________________________________________________________________________________
Pin Description
MAX1407
MAX1414
1 ——FB2 Force/Sense DAC2 Feedback Input
— 1 — IN7 Analog Input. Analog input to the negative mux only.
—— 1 FB1 Force/Sense DAC1 Feedback Input
22— D0 Digital Output. Three-state general-purpose digital output.
3 ——FB1 Force/Sense DAC1 Feedback Input
— 3 — IN6 Analog Input. Analog input to the negative mux only.
4 — 2 OUT1 Force/Sense DAC1 Output
— 4 — IN4 Analog Input. Analog input to the positive mux only.
5 5 3 IN0 Analog Input. Analog input to both the positive and negative mux.
6 6 4 REF
7 7 5 AGND
886AVDDAnalog Supply Voltage
9 9 7 CPLL
10 10 8 WU1
11 11 9 WU2
MAX1408 MAX1409 PIN FUNCTION
1.25V Reference Buffer Output/External Reference Input. Reference voltage
for the ADC and the DAC. Connect a 4.7µF capacitor to REF between REF
and AGND.
Analog Ground. Reference point for the analog circuitry. AGND connects to
the IC substrate.
PLL Capacitor Connection Pin. Connect an 18nF ceramic capacitor between
CPLL and AV
Active-Low Wake-Up Input. Internally pulled up. The device will wake-up from
Sleep mode to Standby mode when WU1 is asserted.
Active-Low Wake-Up Input. Internally pulled up. The device will wake-up from
Sleep mode to Standby mode when WU2 is asserted.
DD
.
Active-Low RESET Output. It remains low while AV
12 12 10 RESET
13 13 — IN1 Analog Input. Analog input to both the positive and negative mux.
14 14 — IN2 Analog Input. Analog input to both the positive and negative mux.
15 15 — SHDN Programmable Shutdown Output. Goes low in Sleep mode.
16 16 — DRDY
17 17 11 FOUT 2.4576MHz Clock Output. FOUT can be used to drive the input clock of a µP.
18 18 12 CLKOUT
19 19 13 CLKIN 32kHz Crystal Input. Connect a 32kHz crystal between CLKIN and CLKOUT.
and stays low for a timeout period after AV
RESET is an open-drain output.
Active-Low Data Ready Output. A logic low indicates that a new conversion
result is available in the Data register. DRDY returns high upon completion of
a full output word read operation. DRDY also signals the end of an ADC
offset-calibration.
32kHz Crystal Output. Connect a 32kHz crystal between CLKIN and
CLKOUT.
rises above the threshold.
DD
is below the threshold
DD
MAX1407/MAX1408/MAX1409/MAX1414
Low-Power, 16-Bit Multichannel DAS with
Internal Reference,10-Bit DACs, and RTC
______________________________________________________________________________________ 15
Detailed Information
The MAX1407/MAX1408/MAX1409/MAX1414 are lowpower, general-purpose, multichannel DAS featuring a
multiplexed fully differential 16-bit ∑∆ analog-to-digital
converter (ADC), 10-bit force/sense digital-to-analog
converters (DAC), a real-time clock (RTC) with an
alarm, a bandgap voltage reference, a signal detect
comparator, two power-supply voltage monitors, wakeup control circuitry, and a high-frequency phase-locked
loop (PLL) clock output all controlled by a 3-wire serial
interface. (See Table 1 for the MAX1407/MAX1408/
MAX1409/MAX1414 feature sets and Figures 1, 2, 3 for
the Functional Diagrams). These DAS directly interface
to various sensor outputs and once configured provide
the stimulus, conditioning, and data conversion, as well
as microprocessor support. Figure 4 is a Typical
Application Circuit for the MAX1407/MAX1414.
The 16-bit ∑∆ ADC is capable of programmable continuous conversion rates of 30Hz or 60Hz and gains of
1/3, 1, and 2V/V to suit applications with different power
and dynamic range constraints. The force/sense DACs
provide 10-bit linearity for precise sensor applications.
Pin Description (continued)
Table 1. MAX1407/MAX1408/MAX1409/MAX1414 Feature Sets
MAX1407
MAX1414
20 20 14 INT
21 21 15 DOUT
22 22 16 DIN
23 23 17 SCLK
24 24 18 CS
25 25 19 DGND Digital Ground. Reference point for digital circuitry.
26 26 20 DV
27 27 — IN3 Analog Input. Analog input to both the positive and negative mux.
28 ——OUT2 Force/Sense DAC2 Output
— 28 — IN5 Analog Input. Analog input to the positive mux only.
MAX1408 MAX1409 PIN FUNCTION
Active-Low Interrupt Output. INT goes low when the PLL output is ready,
when the signal-detect comparator is tripped, or when the alarm is triggered.
Serial Data Output. DOUT outputs serial data from the internal shift register
on SCLK’s falling edge. When CS is high, DOUT is three-stated.
Serial Data Input. Data on DIN is written to the input shift register and is
clocked in at SCLK’s rising edge when CS is low.
Serial Clock Input. Apply an external serial clock to transfer data to and from
the device. This serial clock can be continuous, with data transmitted in a
train of pulses, or intermittent while CS is low.
Active-Low Chip-Select Input. CS is used to select the active device in
systems with more than one device on the serial bus. Data will not be
clocked into DIN unless CS is low. When CS is high, DOUT is three-stated.
DD
Digital Supply Voltage
ADC
PART
MAX1407 4 2 Yes 0 Yes Yes Yes 8
MAX1414 4 2 Yes 50 Yes Yes Yes 8
MAX1408 8 0 Yes 0 Yes Yes Yes 8
MAX1409 1 1 No 0 Yes No No 4
AUXILIARY
ANALOG
INPUTS
FORCE/
SENSE
DAC
THREE-
STATE
DIGITAL
OUTPUT
COMPARATOR
THRESHOLD
(mV)
EXTERNAL
RTC
ADC DATA
READY
(DRDY)
POWERSUPPLY
SHUTDOWN
CONTROL
DIFFERENTIAL
INPUT MUX
ADC
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