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MAX1108EUB+T |MAX1108EUBTMAXIMN/a2500avaiSingle-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs
MAX1109CUB+TG07 |MAX1109CUBTG07MAXIMN/a2196avaiSingle-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs


MAX1108EUB+T ,Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCsApplicationsMAX1108EUB -40°C to +85°C 10 µMAXPortable Data LoggingMAX1109CUB 0°C to +70°C 10 µMAXHa ..
MAX1109CUB ,Single-Supply / Low-Power / 2-Channel / Serial 8-Bit ADCsELECTRICAL CHARACTERISTICS—MAX1108(V = +2.7V to +3.6V; unipolar input mode; COM = GND, f = 500kHz, ..
MAX1109CUB ,Single-Supply / Low-Power / 2-Channel / Serial 8-Bit ADCsApplicationsMAX1108EUB -40°C to +85°C 10 µMAXPortable Data LoggingMAX1109CUB 0°C to +70°C 10 µMAXHa ..
MAX1109CUB ,Single-Supply / Low-Power / 2-Channel / Serial 8-Bit ADCsApplicationsMAX1108EUB -40°C to +85°C 10 µMAXPortable Data LoggingMAX1109CUB 0°C to +70°C 10 µMAXHa ..
MAX1109CUB+TG07 ,Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCsFeaturesThe MAX1108/MAX1109 low-power, 8-bit, dual-channel,♦ Single Supply: +2.7V to +3.6V (MAX1108 ..
MAX1109EUB ,Single-Supply / Low-Power / 2-Channel / Serial 8-Bit ADCsFeaturesThe MAX1108/MAX1109 low-power, 8-bit, dual-channel,' Single Supply: +2.7V to +3.6V (MAX1108 ..
MAX3444EASA+ ,±15kV ESD-Protected, ±60V Fault-Protected, 10Mbps, Fail-Safe RS-485/J1708 Transceivers
MAX3444EESA ,15kV ESD-Protected / 60V Fault-Protected / 10Mbps / Fail-Safe RS-485/J1708 Transceivers
MAX3450EEUD+ ,±15kV ESD-Protected USB Transceivers
MAX3454EEUD ,15kV ESD-Protected USB Transceivers
MAX3454EEUD ,15kV ESD-Protected USB Transceivers
MAX3460CSD ,+5V / Fail-Safe / 20Mbps / Profibus RS-485/ RS-422 Transceivers


MAX1108EUB+T-MAX1109CUB+TG07
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs
General Description
The MAX1108/MAX1109 low-power, 8-bit, dual-channel,
analog-to-digital converters (ADCs) feature an internal
track/hold (T/H) voltage reference, clock, and serial inter-
face. The MAX1108 is specified from +2.7V to +3.6V and
consumes only 105µA. The MAX1109 is specified from
+4.5V to +5.5V and consumes only 130µA. The analog
inputs are software configurable, allowing unipolar/bipolar
and single-ended/differential operation; battery monitor-
ing capability is also included.
The full-scale analog input range is determined by the
internal reference of +2.048V (MAX1108) or +4.096V
(MAX1109), or by an externally applied reference rang-
ing from 1V to VDD. The MAX1108/MAX1109 also feature
a software power-down mode that reduces power con-
sumption to 0.5µA when the device is not in use. The
4-wire serial interface directly connects to SPI™, QSPI™,
and MICROWIRE™ devices without external logic.
Conversions up to 50ksps are performed using either the
internal clock or an external serial-interface clock.
The MAX1108 and MAX1109 are available in a 10-pin
µMAX package with a footprint that is just 20% of an
8-pin plastic DIP.
Applications

Portable Data Logging
Hand-Held Measurement Devices
Medical Instruments
System Diagnostics
Solar-Powered Remote Systems
4–20mA-Powered Remote Systems
Receive-Signal Strength Indicators
Features
Single Supply:+2.7V to +3.6V (MAX1108)
+4.5V to +5.5V (MAX1109)
Low Power:105µA at +3V and 50ksps
0.5µA in Power-Down Mode
Software-Configurable Unipolar or Bipolar InputsInput Voltage Range: 0 to VDDInternal Track/HoldInternal Reference:+2.048V (MAX1108)
+4.096V (MAX1109)
Reference Input Range: 1V to VDDSPI/QSPI/MICROWIRE-Compatible Serial InterfaceVDDMonitoring ModeSmall 10-Pin µMAX Package
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs

SCLK
DOUT
DINGND
CH1
CH0
VDD
MAX1108
MAX1109
μMAX
TOP VIEW
COMREF
INPUT
SHIFT
REGISTER
CONTROL
LOGIC
T/HSAR
INTERNAL
OSCILLATOR
OUTPUT
SHIFT
REGISTER
VDD
ANALOG
INPUT
MUX
INTERNAL
REFERENCE
DOUT
SCLK
DIN
CH0
COM
REF
CH1
GND
CHARGE
REDISTRIBUTION
DAC
MAX1108
MAX1109
Functional Diagram

19-1399; Rev 1; 6/03
Pin Configuration
Ordering Information
PART
MAX1108CUB

MAX1108EUB-40°C to +85°C
0°C to +70°C
TEMP RANGEPIN-PACKAGE

10 µMAX
10 µMAX
MAX1109CUB

MAX1109EUB-40°C to +85°C
0°C to +70°C10 µMAX
10 µMAX
SPI and QSPI are trademarks of Motorola, Inc. MICROWIREis a trademark of National Semiconductor Corp.
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX1108

(VDD= +2.7V to +3.6V; unipolar input mode; COM = GND, fSCLK= 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-
sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; TA= TMINto TMAX; unless otherwise noted. Typical
values are at TA= +25°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.
VDDto GND..............................................................-0.3V to +6V
CH0, CH1, COM, REF, DOUT to GND.......-0.3V to (VDD+ 0.3V)
DIN, SCLK, CSto GND............................................-0.3V to +6V
Continuous Power Dissipation (TA= +70°C)
10-pin µMAX (derate 5.6mW/°C above +70°C)............444mW
Operating Temperature Ranges
MAX110_CUB......................................................0°C to +70°C
MAX110_EUB...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
VDD= 2.7V to 3.6V
VDD= 5.5V (Note 2)
No missing codes over temperature
CONDITIONS

±0.15±0.5
bits8Resolution
LSB±0.2INLRelative Accuracy (Note 1)
LSB±1DNLDifferential Nonlinearity
UNITSMINTYPMAXSYMBOLPARAMETER

VDD= 5.5V (Note 2)
VDD= 2.7V to 3.6VLSB±0.5Offset Error±0.2±1
LSB±1Gain Error (Note 3)
ppm/°C±0.8Gain Temperature Coefficient= TMINto TMAX= +25°C50VDD / 2 Sampling Accuracy49SINADSignal-to-Noise Plus Distortion-70THDTotal Harmonic Distortion
(up to the 5th harmonic)
LSB±0.5TUETotal Unadjusted Error±1
LSB±0.1Channel-to-Channel
Offset Matching
-3dB rolloff
Unipolar input, VCOM= 0
MHz0.8Full-Power Bandwidth
MHz1.5BW-3dBSmall-Signal Bandwidth
0VREF
Input Voltage Range (Note 4)68SFDRSpurious-Free Dynamic Range
Bipolar input, VCOMor VCH1= VREF / 2,
referenced to COM or CH1±VREF/ 2VCH_18CINInput Capacitance
On/off-leakage current,
VCOMor VCH= 0 or VDDµA±0.01±1Multiplexer Leakage Current
DC ACCURACY
DYNAMIC PERFORMANCE (10kHz sine-wave input, 2.048Vp-p, 50ksps, 500kHz external clock)
ANALOG INPUTS
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS—MAX1108 (continued)

(VDD= +2.7V to +3.6V; unipolar input mode; COM = GND, fSCLK= 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-
sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; TA= TMINto TMAX; unless otherwise noted. Typical
values are at TA= +25°C.)
CONDITIONSUNITSMINTYPMAXSYMBOLPARAMETER

External clock, 500kHz, 10 sclks/conv
Internal clock
External clock, 2MHz20tCONVConversion Time (Note 5)351tACQTrack/Hold Acquisition Time<50Aperture Jitter10Aperture Delay
kHz400Internal Clock Frequency
(Note 6)
0 to 0.5mA (Note 7)
ppm/°C±50REF Tempco150IREFSCREF Short-Circuit Current2.5Load Regulation
kHz505001.9682.0482.128VREFOutput Voltage
+2.048V at REF, full scale,
500kHz external clockµA120Input Current2.735.5VDDSupply Voltage
Power down, VDD= 2.7V to 3.6V (Note 9)
Full-scale input, VDD= 2.7V to 3.6V
IDD±0.4±4PSRPower-Supply Rejection (Note 10)
VDD= 2.7V to 3.6V,= 10pF
VDD= 5.5V,= 10pF
1301Capacitive Bypass at REF0.2VHYSTInput Hysteresis0.8VILThreshold Voltage Low±1IIHInput Current High
VDD≤3.6V
VDD> 3.6V23VIHThreshold Voltage High
MHz2External Clock Frequency Range1.0VDD+ 0.05Input Voltage Range±1IILInput Current Low15CINInput Capacitance
For data transfer only
Internal reference
External reference70
Internal reference
External reference95Supply Current (Notes 2, 8)
TRACK/HOLD
INTERNAL REFERENCE
EXTERNAL REFERENCE
POWER REQUIREMENTS
DIGITAL INPUTS (DIN, SCLK, and CS)
Wake-Up Time
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
= VDD= VDD15COUTThree-State Output Capacitance±0.01±10ILThree-State Leakage Current
Figure 1, CLOAD= 100pF
Figure 1, CLOAD= 100pF
Figure 2, CLOAD= 100pF240tDVCSFall to Output Enable
CONDITIONS
200tDOSCLK Fall to Output Data Valid240tTRCSRise to Output Disable100tDSDIN to SCLK Setup Time1.0tACQAcquisition Time0tDHDIN to SCLK Hold Time
External reference
Internal reference (Note 11)20200tCLSCLK Pulse Width Low12tWAKEWake-Up Time0tCSHCSto SCLK Rise Hold100tCSSCSto SCLK Rise Setup200tCHSCLK Pulse Width High
UNITSMINTYPMAXSYMBOLPARAMETER

ISINK= 5mA
ISOURCE= 0.5mA
ISINK= 16mA0.4VDD- 0.5VOHOutput High Voltage0.8VOLOutput Low Voltage
ELECTRICAL CHARACTERISTICS—MAX1108 (continued)

(VDD= +2.7V to +3.6V; unipolar input mode; COM = GND, fSCLK= 500kHz, external clock mode (50% duty cycle); 10 clocks/conver-
sion cycle (50ksps); 1µF capacitor at REF, external +2.048V reference at REF; TA= TMINto TMAX; unless otherwise noted. Typical
values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS—MAX1109

(VDD= +4.5V to +5.5V; unipolar input mode; COM = GND, fSCLK= 500kHz, external clock (50% duty cycle); 10 clocks/conversion
cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; TA= TMINto TMAX; unless otherwise noted. Typical values
are at TA= +25°C.)
VDD= 4.5V to 5.5VLSBOffset Error±0.2±1
LSB±1
VDD= 4.5V to 5.5V
No missing codes over temperature
Gain Error (Note 3)
ppm/°C±0.8
CONDITIONS

Gain Temperature Coefficient= TMINto TMAX= +25°C50VDD / 2 Sampling Accuracy
LSB±0.5TUETotal Unadjusted Error±1
LSB±0.1Channel-to-Channel
Offset Matching
±0.15±0.5
bits8Resolution
LSBINLRelative Accuracy (Note 1)
LSB±1DNLDifferential Nonlinearity
UNITSMINTYPMAXSYMBOLPARAMETER
DIGITAL OUTPUT
(DOUT)
TIMING CHARACTERISTICS (Figures 8, 9, and 10)
DC ACCURACY
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS—MAX1109 (continued)

(VDD= +4.5V to +5.5V; unipolar input mode; COM = GND, fSCLK= 500kHz, external clock (50% duty cycle); 10 clocks/conversion
cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; TA= TMINto TMAX; unless otherwise noted. Typical values
are at TA= +25°C.)<50Aperture Jitter10Aperture Delay
kHz400Internal Clock Frequency
0 to 0.5mA (Note 7)ppm/°C±50REF Tempco
CONDITIONS
IREFSCREF Short-Circuit Current2.5Load Regulation
kHz505003.9364.0964.256VREFOutput Voltage
+4.096V at REF, full scale,
500kHz external clockµA120Input Current
1.0VDD+ 0.05Input Voltage Range1Capacitive Bypass at REF
UNITSMINTYPMAXSYMBOLPARAMETER

External clock, 2MHzSINADSignal-to-Noise Plus Distortion491tACQTrack/Hold Acquisition Time
External clock, 500kHz, 10 sclks/conv
Internal clockµs20tCONVConversion Time (Note 5)35
SFDRSpurious Free Dynamic RangedB
THDTotal Harmonic Distortion
(up to the 5th harmonic)-70
Full-Power BandwidthMHz
Unipolar input, VCOM= 00VREF
-3dB rolloffMHz
BW-3dBSmall-Signal Bandwidth1.5
VCH_Input Voltage Range (Note 4)V
Multiplexer Leakage CurrentµAOn/off-leakage current,
VCH= 0 or VDD±0.01±1CINInput Capacitance18
Bipolar input, VCOMor VCH1= VREF / 2,
referenced to COM or CH1±VREF/ 2
MHz2External Clock Frequency Range
DYNAMIC PERFORMANCE (10kHz sine-wave input, 4.096Vp-p, 50ksps, 500kHz external clock)
ANALOG INPUTS
TRACK/HOLD
EXTERNAL REFERENCE
INTERNAL REFERENCE

For data transfer only
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS—MAX1109 (continued)

(VDD= +4.5V to +5.5V; unipolar input mode; COM = GND, fSCLK= 500kHz, external clock (50% duty cycle); 10 clocks/conversion
cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; TA= TMINto TMAX; unless otherwise noted. Typical values
are at TA= +25°C.)= VDD= VDD15COUTThree-State Output Capacitance±0.01±10ILThree-State Leakage Current
Figure 1, CLOAD= 100pF
Figure 1, CLOAD= 100pF
Figure 2, CLOAD= 100pF240tDVCSFall to Output Enable
CONDITIONS
200tDOSCLK Fall to Output Data Valid240tTRCSRise to Output Disable100tDSDIN to SCLK Setup Time1.0tACQAcquisition Time0tDHDIN to SCLK Hold Time
UNITSMINTYPMAXSYMBOLPARAMETER

ISINK= 5mA
ISINK= 16mA
0.44.555.5VDDSupply Voltage0.8VOLOutput Low Voltage
VDD= 4.5V to 5.5V, = 10pF,
full-scale input
Power down, VDD= 4.5V to 5.5V (Note 9)0.52.5
External reference = +4.096V,
full-scale input, VDD= 4.5V to 5.5VmV±0.4±4PSRPower-Supply Rejection (Note 10)0.2VHYSTInput Hysteresis0.8VILThreshold Voltage Low3VIHThreshold Voltage High±1IIHInput Current High15CINInput Capacitance
ISOURCE= 0.5mAVVDD- 0.5VOHOutput High Voltage±1IILInput Current Low
IDDµASupply Current (Notes 2, 8)
Internal reference
External reference
POWER REQUIREMENTS
DIGITAL INPUTS
(DIN, SCLK, and CS)
DIGITAL OUTPUT (DOUT)
TIMING CHARACTERISTICS (Figures 8, 9, and 10)
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
ELECTRICAL CHARACTERISTICS—MAX1109 (continued)

(VDD= +4.5V to +5.5V; unipolar input mode; COM = GND, fSCLK= 500kHz, external clock (50% duty cycle); 10 clocks/conversion
cycle (50ksps); 1µF capacitor at REF, external +4.096V reference at REF; TA= TMINto TMAX; unless otherwise noted. Typical values
are at TA= +25°C.)
CONDITIONS

External reference
Internal reference (Note 11)20200tCLSCLK Pulse Width Low12tWAKEWake-Up Time0tCSHCSto SCLK Rise Hold100tCSSCSto SCLK Rise Setup200tCHSCLK Pulse Width High
UNITSMINTYPMAXSYMBOLPARAMETER
Note 1:
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the full-scale range has
been calibrated.
Note 2:
See Typical Operating Characteristics.
Note 3:
VREF= +2.048V (MAX1108), VREF= +4.096V (MAX1109), offset nulled.
Note 4:
Common-mode range (CH0, CH1, COM) GND to VDD.
Note 5:
Conversion time defined as the number of clock cycles times the clock period; clock has 50% duty cycle (Figures 6 and 8).
Note 6:
REF supplies typically 2.5mA under normal operating conditions.
Note 7:
External load should not change during the conversion for specified accuracy.
Note 8:
Power consumption with CMOS levels.
Note 9:
Power-down test performed using the following sequence 1) SHDN5bit = 0 in the configuration register; 2) Wait for 10
SCLK cycles to complete current conversion; 3) Measure shutdown current with CS, SCLK, DIN= VDDor GND.
Note 10:
Measured as  VFS(2.7V) - VFS(3.6V)for MAX1108, and measured as VFS(4.5V) - VFS(5.5V)for MAX1109.
Note 11:
1µF at REF, internal reference settling to 0.5LSB.
Typical Operating Characteristics

(VDD= +3.0V (MAX1108), VDD= +5.0V (MAX1109); external conversion mode; fSCLK= 500kHz; 50ksps; external reference; 1µF at
REF; TA= +25°C; unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX1108/09-01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
100DOUT = 10101010
MAX1108 (2.7V TO 5.5V)
MAX1109 (4.5V TO 5.5V)
INTERNAL REFERENCE
CLOAD = 47pF
CLOAD = 10pF
SUPPLY CURRENT vs. TEMPERATURE
MAX1108/09-02
TEMPERATURE (°C)
SUPPLY CURRENT (
VDD = 5V
VDD = 3V
DOUT = 10101010
CLOAD = 10pF
INTERNAL REFERENCE
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1108/09-03
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (
0.15
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
Typical Operating Characteristics (continued)

(VDD= +3.0V (MAX1108), VDD= +5.0V (MAX1109); external conversion mode; fSCLK= 500kHz; 50ksps; external reference; 1µF at
REF; TA= +25°C; unless otherwise noted.)
OFFSET ERROR vs. SUPPLY VOLTAGE
MAX1108/09-04
SUPPLY VOLTAGE (V)
OFFSET ERROR (LSB)
OFFSET ERROR vs. TEMPERATURE
MAX1108/09-05
TEMPERATURE (°C)
OFFSET ERROR (LSB)
OFFSET ERROR vs. REFERENCE VOLTAGE
MAX1108/09-06
REFERENCE VOLTAGE (V)
OFFSET ERROR (LSB)
GAIN ERROR vs. SUPPLY VOLTAGE
MAX1108/09-07
SUPPLY VOLTAGE (V)
GAIN ERROR (LSB)
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX1108/09-10
SUPPLY VOLTAGE (V)
INL (LSB)
GAIN ERROR vs. TEMPERATURE
MAX1108/09-08
TEMPERATURE (°C)
GAIN ERROR (LSB)
GAIN ERROR vs. REFERENCE VOLTAGE
MAX1108/09-09
REFERENCE VOLTAGE (V)
GAIN ERROR (LSB)
DIFFERENTIAL NONLINEARITY
vs. CODE
MAX1108/09-11
DIGITAL CODE
DNL (LSB)100150200250
DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE
MAX1108/09-12
SUPPLY VOLTAGE (V)
DNL (LSB)
-0.1
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs

INTEGRAL NONLINEARITY
vs. CODE
MAX1108/09-13
DIGITAL CODE
INL (LSB)100150200250
FFT PLOT
MAX1108/09-14
FREQUENCY (kHz)
AMPLITUDE (dB)
fCH_ = 9997Hz, 2Vp-p
fSAMPLE = 53.25kHz
CONVERSION TIME vs. SUPPLY VOLTAGE
MAX1108/09-15
SUPPLY VOLTAGE (V)
CONVERSION TIME(345
INTERNAL CONVERSION MODE
Typical Operating Characteristics (continued)

(VDD= +3.0V (MAX1108), VDD= +5.0V (MAX1109); external conversion mode; fSCLK= 500kHz; 50ksps; external reference; 1µF at
REF; TA= +25°C; unless otherwise noted.)
Pin Description

Sampling Analog InputsCH0, CH12, 3
Reference voltage for analog-to-digital conversion (internal or external reference). Reference input for
external reference. Bypass internal reference with 1µF capacitor to GND.REF5
GroundGND4
Active-Low Chip Select. Data is not clocked into DIN unless CSis low. When CSis high, DOUT is high
impedance.CS7
Serial Data Output. Data is clocked out on the falling edge of SCLK. High impedance when CSis high.DOUT9
Serial Data Input. Data is clocked in at the rising edge of SCLK.DIN8
Common reference for analog inputs. Sets zero-code voltage in single-ended mode. Must be stable to
±0.5LSB during conversion.COM6
Serial Clock Input. Clocks data in and out of serial interface. In external clock mode, SCLK also sets the
conversion speed.SCLK10
PIN

Positive Supply VoltageVDD1
FUNCTIONNAME

CONVERSION TIME vs. TEMPERATUREMAX1108/09-16
TEMPERATURE (°C)
CONVERSION TIME (
INTERNAL CONVERSION MODE
VDD = 3V
VDD = 5V
NORMALIZED REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1108/09-17
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
CHANNEL-TO-CHANNEL
CROSSTALK vs. FREQUENCY
MAX1108/09-18
FREQUENCY (kHz)
CROSSTALK (dB)
VCH_OFF = VREFp-p
MAX1108/MAX1109
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
_______________Detailed Description

The MAX1108/MAX1109 analog-to-digital converters
(ADCs) use a successive-approximation conversion
technique and input track/hold (T/H) circuitry to convert
an analog signal to an 8-bit digital output. A flexible
serial interface provides easy interface to microproces-
sors (µPs). No external hold capacitors are required. All
of the MAX1108/MAX1109 operating modes are soft-
ware-configurable: internal or external reference, inter-
nal or external conversion clock, single-ended unipolar
or pseudo-differential unipolar/bipolar conversion, and
power down (Table 1).
Analog Inputs
Track/Hold

The input architecture of the ADCs is illustrated in the
equivalent-input circuit of Figure 4 and is composed of
the T/H, the input multiplexer, the input comparator, the
switched capacitor DAC, the reference, and the auto-
zero rail.
The analog-inputs configuration is determined by the
control-byte through the serial interface as shown in
Table 2 (see Modes of Operationsection and Table 1).
The eight modes of operation include single-ended,
pseudo-differential, unipolar/bipolar, and a VDDmoni-
toring mode. During acquisition and conversion, only
one of the switches in Figure 4 is closed at any time.
The T/H enters its tracking mode on the falling clock
edge after bit 4 (SEL0) of the control byte has been
shifted in. It enters its hold mode on the falling edge
after the bit 2 (I/EREF) of the control byte has been
shifted in.
For example, If CH0 and COM are chosen (SEL2 =
SEL1 = SEL0 = 1) for conversion, CH0 is defined as the
sampled input (SI), and COM is defined as the refer-
ence input (RI). During acquisition mode, the CH0
switch and the T/H switch are closed, charging the
VDD
3kΩ
CLOAD
DGND
DOUT
CLOAD
DGND
3kΩ
DOUT
a) High-Z to VOH and VOL to VOHb) High-Z to VOL and VOH to VOL

Figure 1. Load Circuits for Enable Time
VDD
3kΩ
CLOAD
DGND
DOUT
CLOAD
DGND
3kΩ
DOUT
a) VOH to High-Zb) VOL to High-Z

Figure 2. Load Circuits for Disable Time
VDD
I/O
SCK (SK)
MOSI (SO)
MISO (SI)
VSS
DOUT
DIN
SCLK
COM
GND
VDD
CH1
1μF
0.1μF1μF
CH0
ANALOG
INPUTS
MAX1108
MAX1109
CPU
VDD
REF
Figure 3. Typical Operating Circuit
CH0
COM
VDD / 2
GND
CH1
REF
GND
CHOLD
18pF
CAPACITIVE DAC
COMPARATOR
RIN
6.5kΩ
AUTOZERO
RAIL
TRACKHOLD
Figure 4. Equivalent Input Circuit
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