Rainbow Electronics MAX11645 User Manual
General Description
The MAX11644/MAX11645 low-power, 12-bit, 1-/2channel analog-to-digital converters (ADCs) feature
internal track/hold (T/H), voltage reference, clock, and
an I2C-compatible 2-wire serial interface. These
devices operate from a single supply of 2.7V to 3.6V
(MAX11645) or 4.5V to 5.5V (MAX11644) and require
only 6μA at a 1ksps sample rate. AutoShutdown™ powers down the devices between conversions, reducing
supply current to less than 1μA at low throughput rates.
The MAX11644/MAX11645 each measure two singleended or one differential input. The fully differential analog inputs are software configurable for unipolar or
bipolar, and single-ended or differential operation.
The full-scale analog input range is determined by the
internal reference or by an externally applied reference
voltage ranging from 1V to V
DD
. The MAX11645 features a 2.048V internal reference and the MAX11644
features a 4.096V internal reference.
The MAX11644/MAX11645 are available in an ultra-tiny
1.9mm x 2.2mm WLP package and an 8-pin μMAX
®
package. The MAX11644/MAX11645 are guaranteed
over the extended temperature range (-40°C to +85°C).
For pin-compatible 10-bit parts, refer to the MAX11646/
MAX11647 data sheet.
Applications
Features
♦ Ultra-Tiny 1.9mm x 2.2mm Wafer Level Package
♦ High-Speed I
2
C-Compatible Serial Interface
400kHz Fast Mode
1.7MHz High-Speed Mode
♦ Single-Supply
2.7V to 3.6V (MAX11645)
4.5V to 5.5V (MAX11644)
♦ Internal Reference
2.048V (MAX11645)
4.096V (MAX11644)
♦ External Reference: 1V to V
DD
♦ Internal Clock
2-Channel Single-Ended or 1-Channel Fully
Differential
♦ Internal FIFO with Channel-Scan Mode
♦ Low Power
670µA at 94.4ksps
230µA at 40ksps
60µA at 10ksps
6µA at 1ksps
0.5µA in Power-Down Mode
♦ Software-Configurable Unipolar/Bipolar
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-5225; Rev 1; 9/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
AutoShutdown is a trademark and μMAX is a registered trademark
of Maxim Integrated Products, Inc.
+
Denotes a lead(Pb)-free/RoHs-compliant package.
Handheld Portable
Applications
Medical Instruments
Battery-Powered Test
Equipment
Solar-Powered Remote
Systems
Received-Signal-Strength
Indicators
System Supervision
Power-Supply Monitoring
PART TEMP RANGE
MAX11644EUA+ -40°C to +85°C 8 μMAX 0110110
MAX11645EUA+ -40°C to +85°C 8 μMAX 0110110
MAX11645EWC+ -40°C to +85°C 12 WLP 0110110
PINPACKAGE
2
I
C SLAVE
ADDRESS
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= 2.7V to 3.6V (MAX11645), VDD= 4.5V to 5.5V (MAX11644), V
REF
= 2.048V (MAX11645), V
REF
= 4.096V (MAX11644),
f
SCL
= 1.7MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C, see Tables 1–5 for programming
notation.) (Note 1)
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.
VDDto GND..............................................................-0.3V to +6V
AIN0, AIN1, REF to GND ..............................-0.3V to the lower of
(VDD+ 0.3V) and 6V
SDA, SCL to GND.....................................................-0.3V to +6V
Maximum Current into Any Pin .........................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin μMAX (derate 4.5mW/°C above +70°C) ..............362mW
12-Pin WLP (derate 16.1mW/°C above +70°C) ..........1288mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s)
μMAX only.....................................................................+300°C
Soldering Temperature (reflow) .......................................+260°C
DC ACCURACY (Note 2)
Resolution 12 Bits
Relative Accuracy INL (Note 3) ±1 LSB
Differentia l Non linearity DNL No miss ing codes over temperature ±1 LSB
Offset Error ±4 LSB
Offset-Error Temperature
Coefficient
Gain Error (Note 4) ±4 LSB
Gain-Temperature Coefficient Relative to FSR 0.3 ppm/°C
Channel-to-Channel Offset
Matching
Channel-to-Channel Gain
Matching
DYNAMIC PERFORMANCE (f
Signal-to-Noise Plus Distortion SINAD 70 dB
Total Harmonic D istortion THD Up to the 5th harmonic -78 dB
Spurious-Free Dynamic Range SFDR 78 dB
Ful l-Power Bandwidth SINAD > 68dB 3 MHz
Ful l-Linear Bandwidth -3dB point 5 MHz
CONVERSION RATE
Conversion Time (Note 5) t
Throughput Rate f
Track/Hold Acquis ition Time 800 ns
Internal Clock Frequency 2.8 MHz
Aperture Delay (Note 6) t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
IN(SINE-WAVE)
Relative to FSR 0.3 ppm/°C
±0.1 LSB
±0.1 LSB
CONV
SAMPLE
AD
= 10kHz, V
Internal clock 7.5
External clock 10.6
Internal clock, SCAN[1:0] = 01 51
External clock 94.4
External clock, fast mode 60
External clock, high-speed mode 30
IN(P-P)
= V
REF
, f
SAMPLE
= 94.4ksps)
μs
ksps
ns
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= 2.7V to 3.6V (MAX11645), VDD= 4.5V to 5.5V (MAX11644), V
REF
= 2.048V (MAX11645), V
REF
= 4.096V (MAX11644),
f
SCL
= 1.7MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C, see Tables 1–5 for programming
notation.) (Note 1)
ANALOG INPUT (AIN0/AIN1)
Ended and Different ia l (Note 7)
Input Multiplexer Leakage
Input Capacitance CIN 22 pF
INTERNAL REFERENCE (Note 8)
Reference Voltage V
Reference-Voltage Temperature
Coefficient
REF Short-Circuit Current 2 mA
REF Source Impedance 1.5 k
EXTERNAL REFERENCE
REF Input Voltage Range V
REF Input Current I
DIGITAL INPUTS/OUTPUTS (SCL, SDA)
Input-High Voltage VIH 0.7 x VDD V
Input-Low Voltage VIL 0.3 x VDD V
Input Hystere sis V
Input Current IIN VIN = 0 to VDD ±10 μA
Input Capacitance CIN 15 pF
Output Low Voltage VOL I
POWER REQUIREMENTS
Supply Voltage V
Supply Current I
Power-Supply Rejection Ratio PSRR Full-scale input (Note 10) ±0.5 ±2.0 LSB/V
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
Unipolar 0 V
Bipolar 0 ±V
On/off lea kage current, V
TA = +25°C
REF
25 ppm/°C
TCV
REF
(Note 9) 1 VDD V
REF
f
REF
HYST
DD
DD
SAMPLE
0.1 x VDD V
= 3mA 0.4 V
SINK
MAX11645 2.7 3.6
MAX11644 4.5 5.5
f
SAMPLE
external clock
f
SAMPLE
internal clock
f
SAMPLE
internal clock
f
SAMPLE
internal clock
Shutdown (internal REF off) 0.5 10
MAX11645 1.968 2.048 2.128
MAX11644 3.936 4.096 4.256
= 94.4ksps 40 μA
= 94.4ksps
= 40ksps
= 10ksps
=1ksps
_ = 0 or V
AIN
Internal reference 900 1150
External reference 670 900
Internal reference 530
External reference 230
Internal reference 380
External reference 60
Internal reference 330
External reference 6
DD
REFInput Voltage Range, Single-
REF
±0.01 ±1 μA
V
/2
V
V
μA
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
4 _______________________________________________________________________________________
TIMING CHARACTERISTICS (Figure 1)
(VDD= 2.7V to 3.6V (MAX11645), VDD= 4.5V to 5.5V (MAX11644), V
REF
= 2.048V (MAX11645), V
REF
= 4.096V (MAX11644),
f
SCL
= 1.7MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C, see Tables 1–5 for programming
notation.) (Note 1)
TIMING CHARACTERISTICS FOR FAST MODE
Serial-Clock Frequency f
Bus Free Time Between a STOP (P)
and a START (S) Condition
Hold Time f or START C ond ition t
Low Period of the SCL Clock t
High Period of the SCL Clock t
Setup Time for a Repeated START
(Sr) Condit ion
Data Hold Time t
Data Setup Time t
Rise Time of Both SDA and SCL
Signals, Receiving
Fal l Time of SDA Transmitt ing tF Measured from 0.3VDD - 0.7V
Setup Time for STOP Condition t
Capacitive Load for Each Bu s Line CB 400 pF
Pulse Width of Spike Suppressed tSP 50 ns
TIMING CHARACTERISTICS FOR HIGH-SPEED MODE (CB = 400pF, Note 13)
Serial-Clock Frequency f
Hold Time, Repeated START
Condition
Low Period of the SCL Clock t
High Period of the SCL Clock t
Setup Time for a Repeated START
Condition
Data Hold Time tHD,
Data Setup Time tSU,
Rise Time of SCL Signal
(Current Source Enabled)
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
400 kH z
SCL
1.3 μs
t
BUF
0.6 μs
HD, STA
1.3 μs
LOW
0.6 μs
HIGH
0.6 μs
t
SU,STA
(Note 11) 0 900 ns
HD,DAT
100 ns
SU,DAT
Measured from 0.3VDD - 0.7VDD 20 + 0.1CB 300 ns
t
R
0.6 μs
SU,STO
(Note 14) 1.7 MHz
SCLH
t
160 ns
HD, STA
320 ns
LOW
120 ns
HIGH
t
160 ns
SU,STA
(Note 11) 0 150 ns
DAT
10 ns
DAT
t
20 80 ns
RCL
(Note 12) 20 + 0.1CB 300 ns
DD
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
_______________________________________________________________________________________ 5
TIMING CHARACTERISTICS (Figure 1) (continued)
(VDD= 2.7V to 3.6V (MAX11645), VDD= 4.5V to 5.5V (MAX11644), V
REF
= 2.048V (MAX11645), V
REF
= 4.096V (MAX11644),
f
SCL
= 1.7MHz, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C, see Tables 1–5 for programming
notation.) (Note 1)
Note 1: All WLP devices are 100% production tested at T
A
= +25°C. Specifications over temperature limits are guaranteed by
design and characterization.
Note 2: For DC accuracy, the MAX11644 is tested at VDD= 5V and the MAX11645 is tested at VDD= 3V with an external
reference for both ADCs. All devices are configured for unipolar, single-ended inputs.
Note 3: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range and
offsets have been calibrated.
Note 4: Offset nulled.
Note 5: Conversion time is defined as the number of clock cycles needed for conversion multiplied by the clock period.
Conversion time does not include acquisition time. SCL is the conversion clock in the external clock mode.
Note 6: A filter on the SDA and SCL inputs suppresses noise spikes and delays the sampling instant.
Note 7: The absolute input voltage range for the analog inputs (AIN0/AIN1) is from GND to V
DD
.
Note 8: When the internal reference is configured to be available at REF (SEL[2:1] = 11), decouple REF to GND with a
0.1μF capacitor and a 2kΩ series resistor (see the
Typical Operating Circuit
).
Note 9: ADC performance is limited by the converter’s noise floor, typically 300μV
P-P
.
Note 10: Measured for the MAX11645 as:
and for the MAX11644, where N is the number of bits:
Note 11: A master device must provide a data hold time for SDA (referred to V
IL
of SCL) to bridge the undefined region of SCL’s
falling edge (see Figure 1).
Note 12: The minimum value is specified at T
A
= +25°C.
Note 13: C
B
= total capacitance of one bus line in pF.
Note 14: f
SCL
must meet the minimum clock low time plus the rise/fall times.
Rise Time of SCL Signal After
Acknowledge Bit
Fal l Time of SCL Signal t
Rise Time of SDA Signal t
Fal l Time of SDA Signal t
Setup Time for STOP Condition tSU,
Capacitive Load for Each Bu s Line CB 400 pF
Pulse Width of Spike Suppressed tSP (Notes 11 and 14) 0 10 ns
PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS
t
Measured from 0.3VDD - 0.7VDD 20 160 ns
RCL1
Measured from 0.3VDD - 0.7VDD 20 80 ns
FCL
Measured from 0.3VDD - 0.7VDD 20 160 ns
RDA
Measured from 0.3VDD - 0.7V
FDA
160 ns
STO
(Note 12) 20 160 ns
DD
⎡
⎢
VVVV
(. ) (. )
36 27
⎡
FS FS
⎣
⎢
⎣
⎡
⎢
VVVV
⎡
FS FS
⎣
⎢
⎣
−
V
(.
36
−− 27.)V
(. ) (. )
55 45
−
V
(.
55
−− 45.)V
N
⎤
2
⎥
×
⎤
⎦
V
REF
⎥
⎦
N
⎤
2
⎥
×
⎤
⎦
V
REF
⎥
⎦
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
6 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= 3.3V (MAX11645), VDD= 5V (MAX11644), f
SCL
= 1.7MHz, 50% duty cycle, f
SAMPLE
= 94.4ksps, single-ended, unipolar,
T
A
= +25°C, unless otherwise noted.)
-140
-120
-100
-80
-60
-40
-20
0 10k 20k 30k 40k 50k
FFT PLOT
MAX11644 toc03
FREQUENCY (Hz)
AMPLITUDE (dBc)
f
SAMPLE
= 94.4ksps
f
IN
= 10kHz
300
400
350
500
450
600
550
650
750
700
800
-40 -10 5-25 20 35 50 65 80
SUPPLY CURRENT
vs. TEMPERATURE
MAX11644 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
SETUP BYTE
EXT REF: 10111011
INT REF: 11011011
INTERNAL REFERENCE MAX11644
INTERNAL REFERENCE MAX11645
EXTERNAL REFERENCE MAX11644
EXTERNAL REFERENCE MAX11645
0
0.2
0.1
0.4
0.3
0.5
0.6
2
.75
.2
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX11644 toc05
SUPPLY VOLTAGE (V)
I
DD
(μA)
3.73.24.24.7
SDA = SCL = V
DD
0
0.10
0.05
0.20
0.15
0.30
0.25
0.35
0.45
0.40
0.50
-40 -10 5
-25
20 35 50 65 80
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX11644 toc06
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
MAX11644
MAX11645
0
200
100
300
400
500
600
700
800
900
1000
0 20406080100
ANALOG SUPPLY CURRENT vs.
CONVERSION RATE (EXTERNAL CLOCK)
MAX11644 toc07
CONVERSION RATE (ksps)
AVERAGE I
DD
(μA)
0
EXTERNAL REFERENCE
INTERNAL REFERENCE ALWAYS ON
DIFFERENTIAL NONLINEARITY
vs. DIGITAL CODE
0.5
0.4
0.3
0.2
0.1
0
DNL (LSB)
-0.1
-0.2
-0.3
-0.4
-0.5
1000 1500500
0 4000
2000 2500
DIGITAL OUTPUT CODE
3000 3500
MAX11644 toc01
INL (LSB)
INTEGRAL NONLINEARITY
vs. DIGITAL CODE
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
1000 1500500
0 4000
2000 2500
DIGITAL OUTPUT CODE
3000 3500
MAX11644 toc02
MAX11644/MAX11645
Low-Power, 1-/2-Channel, I2C, 12-Bit ADCs
in Ultra-Tiny 1.9mm x 2.2mm Package
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(VDD= 3.3V (MAX11645), VDD= 5V (MAX11644), f
SCL
= 1.7MHz, 50% duty cycle, f
SAMPLE
= 94.4ksps, single-ended, unipolar,
T
A
= +25°C, unless otherwise noted.)
INTERNAL REFERENCE VOLTAGE
1.0010
1.0008
1.0006
1.0004
1.0002
1.0000
NORMALIZED
0.9998
REF
V
0.9996
0.9994
0.9992
0.9990
-40 -10 5-25 20 35 50 65 80
vs. TEMPERATURE
NORMALIZED TO VALUE AT TA = +25°C
MAX11644
MAX11645
TEMPERATURE (°C)
MAX11644 toc09
1.00010
1.00008
1.00006
1.00004
1.00002
(V)
1.00000
REF
V
0.99998
0.99996
0.99994
0.99992
0.99990
NORMALIZED REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX11644
NORMALIZED TO
REFERENCE VALUE AT
= 5V
V
DD
MAX11645
NORMALIZED TO
REFERENCE VALUE AT
= 3.3V
V
DD
2
.33.63.93.04.24.54.85.15.4
.73
VDD (V)
MAX11644 toc10
OFFSET ERROR vs. TEMPERATURE
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
OFFSET ERROR (LSB)
-0.7
-0.8
-0.9
-1.0
-40
TEMPERATURE (°C)
GAIN ERROR vs. TEMPERATURE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
GAIN ERROR (LSB)
0.6
0.4
0.2
0
-40
TEMPERATURE (°C)
806535 50-10 5 20-25
806535 50-10 5 20-25
MAX11644 toc11
MAX11644 toc13
OFFSET ERROR vs. SUPPLY VOLTAGE
2.0
1.6
1.2
0.8
0.4
0
-0.4
OFFSET ERROR (LSB)
-0.8
-1.2
-1.6
-2.0
2.7
VDD (V)
GAIN ERROR vs. SUPPLY VOLTAGE
2.0
1.6
1.2
0.8
0.4
0
-0.4
GAIN ERROR (LSB)
-0.8
-1.2
-1.6
-2.0
2.7
VDD (V)
MAX11644 toc12
5.25.54.74.23.73.2
MAX11644 toc14
5.25.54.74.23.73.2
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