MAX1220/MAX1257/MAX1258 12-Bit, Multichannel ADCs/DACs
with FIFO, Temperature Sensing,
and GPIO Ports
EVALUATION KIT AVAILABLE
General Description
The MAX1220/MAX1257/MAX1258 is a highly integrat-
ed system monitoring and control solution which
includes a 16-channel (MAX1257/MAX1258) or 8-ch
(MAX1220) 12-bit Analog to Digital Converter (ADC),
twelve 12-bit Digital to Analog Converters (DACs), an
internal reference, an internal temp sensor, a 4-bit
(MAX1220) or 12-bit (MAX1257/MAX1258) GPIO port,
and a 25MHz SPI-/QSPI™-/MICROWIRE®- compatible
serial interface.
The MAX1220 is available in a 36-pin TQFN package.
The MAX1257/MAX1258 are available in 48-pin TQFN
package. All devices are specified over the -40°C to
+85°C temperature range.
Applications
•Controls for Optical Components
•Base-Station Control Loops
•System Supervision and Control
•Data-Acquisition Systems
Benefits and Features
•Reduce Parts Count and Board Space with Fully
Integrated System Monitor and Controller
•Monitors 8 (MAX1220) or 16 Voltages
(MAX1257/MAX1258) Using 12-Bit, 225ksps ADC
•Controls 8 Output Voltage Level with 12-Bit, Octal,
2µs Settling DAC with Ultra-Low Glitch Energy
(4n x VS)
•Measures Temperature with Internal ±1°C
Accurate Temperature Sensor
•Options for Using Either Internal 2.5V (MAX1257)
Reference, 4.096V (MAX1220/MAX1258)
Reference or External Reference
•Includes 4 (MAX1220) or 12 (MAX1257/1258)
GPIOs
•Lower Processor Requirements and Minimize Power
Consumption and Heat Dissipation
•On-Chip FIFO, Channel-Scan Mode and Data
Averaging
•Autoshutdown Between Conversions
•Low-Power ADC
2.5mA at 225ksps
22µA at 1ksps
•Low-Power DAC: 1.5mA
•TQFN Package with Exposed Pad
•Enable Maximum Dynamic Range with Availability of
2 Analog Power Supply Options: +2.7V to +3.6V
(MAX1257) or +4.75V to +5.25V
(MAX1220/MAX1258)
Note: All devices are specified over the -40°C to +85°C
operating range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
**
Number of resolution bits refers to both DAC and ADC.
Pin Configurations appear at end of data sheet.
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Ordering Information/Selector Guide
PART PIN-PACKAGE
REF
VOLTAGE
(V)
ANALOG
SUPPLY
VOLTAGE (V)
RESOLUTION
BITS**
ADC
CHANNELS
DAC
CHANNELS GPIOs
MAX1220BETX+ 36 Thin QFN-EP* 4.096 4.75 to 5.25 12 8 8 4
MAX1257BETM+ 48 Thin QFN-EP* 2.5 2.7 to 3.6 12 16 8 12
MAX1258BETM+ 48 Thin QFN-EP* 4.096 4.75 to 5.25 12 16 8 12
19-3295; Rev 8; 1/15
DOUT
EOC
AIN0
AIN13
REF2/
AIN14
CNVST/
AIN15
REF1
DIN
SCLK
CS
GPIOA0–
GPIOA3
GPIOB0–
GPIOB3
GPIOC0–
GPIOC3
AVDD
SPI
PORT
AND
LOGIC
CNTRL
R
E
G
I
S
T
E
R
S
OUTPUT
CONDITIONING
12-BIT
DAC
USER-PROGRAMMABLE
I/O
OSCILLATOR
OUT0
OUT1
OUT2
OUT4
OUT5
OUT6
MAX1257
MAX1258
12-BIT
SAR
ADC
TEMPERATURE
SENSOR
FIFO AND
ALU
LDAC RES_SEL
AGND
T/H
REFERENCE
OUTPUT
CONDITIONING
12-BIT
DAC
OUT3
OUT7
DGND
DVDD
Functional Diagram
Maxim Integrated | 2www.maximintegrated.com
MAX1220/MAX1257/MAX1258 12-Bit, Multichannel ADCs/DACs
with FIFO, Temperature Sensing,
and GPIO Ports
Absolute Maximum Ratings
Electrical Characteristics
(VAVDD = VDVDD = 2.7V to 3.6V (MAX1257), external reference VREF = 2.5V (MAX1257), VAVDD = 4.75V to 5.25V, VDVDD = 2.7V to VAVDD
(MAX1220/MAX1258), external reference VREF = 4.096V (MAX1220/MAX1258), fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C,
unless otherwise noted. Typical values are at VAVDD = VDVDD = 3V (MAX1257), VAVDD = VDVDD = 5V (MAX1220/MAX1258), TA= +25°C.
Outputs are unloaded, unless otherwise noted.)
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.
AVDD to AGND ........................................................-0.3V to +6V
DGND to AGND.....................................................-0.3V to +0.3V
DVDD to AVDD......................................................-3.0V to +0.3V
Digital Inputs to DGND.............................................-0.3V to +6V
Digital Outputs to DGND ........................-0.3V to (VDVDD + 0.3V)
Analog Inputs, Analog Outputs and REF_
to AGND .............................................-0.3V to (VAVDD + 0.3V)
Maximum Current into Any Pin (except AGND, DGND, AVDD,
DVDD, and OUT_)...........................................................50mA
Maximum Current into OUT_.............................................100mA
Continuous Power Dissipation (multilayer board, TA= +70°C)
36-Pin TQFN (6mm x 6mm)
(derate 35.7mW/°C above +70°C)......................2857.1mW
48-Pin TQFN (7mm x 7mm)
(derate 40mW/°C above +70°C)............................3200mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature ...................................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ADC
DC ACCURACY (Note 1)
Resolution 12 Bits
Integral Nonlinearity INL ±0.5 ±1.0 LSB
Differential Nonlinearity DNL ±0.5 ±1.0 LSB
Offset Error ±1 ±4.0 LSB
Gain Error (Note 2) ±0.1 ±4.0 LSB
Gain Temperature Coefficient ±0.8 ppm/°C
Channel-to-Channel Offset ±0.1 LSB
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, VIN = 2.5VP-P (MAX1257), VIN = 4.096VP-P (MAX1220/MAX1258),
225ksps, fCLK = 3.6MHz)
Signal-to-Noise Plus Distortion SINAD 70 dB
Total Harmonic Distortion
(Up to the Fifth Harmonic) THD -76 dBc
Spurious-Free Dynamic Range SFDR 72 dBc
Intermodulation Distortion IMD fIN1 = 9.9kHz, fIN2 = 10.2kHz 76 dBc
Full-Linear Bandwidth SINAD > 70dB 100 kHz
Full-Power Bandwidth -3dB point 1 MHz
CONVERSION RATE (Note 3)
External reference 0.8 µs
Power-Up Time tPU Internal reference (Note 4) 218
C onver si on
cl ock
cycl es
Note: If the package power dissipation is not exceeded, one output at a time may be shorted to AVDD, DVDD, AGND, or DGND
indefinitely.
MAX1220/MAX1257/MAX1258 12-Bit, Multichannel ADCs/DACs
with FIFO, Temperature Sensing,
and GPIO Ports
Maxim Integrated | 3www.maximintegrated.com
Electrical Characteristics (continued)
(VAVDD = VDVDD = 2.7V to 3.6V (MAX1257), external reference VREF = 2.5V (MAX1257), VAVDD = 4.75V to 5.25V, VDVDD = 2.7V to VAVDD
(MAX1220/MAX1258), external reference VREF = 4.096V (MAX1220/MAX1258), fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C,
unless otherwise noted. Typical values are at VAVDD = VDVDD = 3V (MAX1257), VAVDD = VDVDD = 5V (MAX1220/MAX1258), TA= +25°C.
Outputs are unloaded, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Acquisition Time tACQ (Note 5) 0.6 μs
Internally clocked 5.5
Conversion Time tCONV Externally clocked 3.6 μs
External Clock Frequency fCLK Externally clocked conversion (Note 5) 0.1 3.6 MHz
Duty Cycle 40 60 %
Aperture Delay 30 ns
Aperture Jitter < 50 ps
ANALOG INPUTS
Unipolar 0 VREF
Input Voltage Range (Note 6) Bipolar -VREF/2 +VREF/2 V
Input Leakage Current ±0.01 ±1 μA
Input Capacitance 24 pF
INTERNAL TEMPERATURE SENSOR
TA = +25°C ±0.7
Measurement Error (Notes 5, 7) TA = TMIN to TMAX ±1.0 ±3.0
°C
Temperature Resolution 1/8 °C/LSB
INTERNAL REFERENCE
MAX1257 2.482 2.50 2.518
REF1 Output Voltage (Note 8) MAX1220/MAX1258 4.066 4.096 4.126
V
REF1 Voltage Temperature
Coefficient TCREF ±30 ppm/°C
REF1 Output Impedance 6.5 k
VREF = 2.5V 0.39
REF1 Short-Circuit Current VREF = 4.096V 0.63 mA
EXTERNAL REFERENCE
REF1 Input Voltage Range VREF1 REF mode 11 (Note 4) 1 VAVDD
+ 0.05 V
REF mode 01 1 VAVDD
+ 0.05
REF2 Input Voltage Range
(Note 4) VREF2
REF mode 11 0 1
V
Maxim Integrated | 4www.maximintegrated.com
MAX1220/MAX1257/MAX1258 12-Bit, Multichannel ADCs/DACs
with FIFO, Temperature Sensing,
and GPIO Ports
Electrical Characteristics (continued)
(VAVDD = VDVDD = 2.7V to 3.6V (MAX1257), external reference VREF = 2.5V (MAX1257), VAVDD = 4.75V to 5.25V, VDVDD = 2.7V to VAVDD
(MAX1220/MAX1258), external reference VREF = 4.096V (MAX1220/MAX1258), fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C,
unless otherwise noted. Typical values are at VAVDD = VDVDD = 3V (MAX1257), VAVDD = VDVDD = 5V (MAX1220/MAX1258), TA= +25°C.
Outputs are unloaded, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VREF = 2.5V (MAX1257), fSAMPLE = 25 80
VREF = 4.096V (MAX1220/MAX1258),
fSAMPLE = 225ksps 40 80
REF1 Input Current (Note 9) IREF1
Acquisition between conversions ±0.01 ±1
μA
VREF = 2.5V (MAX1257), fSAMPLE = 25 80
VREF = 4.096V (MAX1220/MAX1258),
fSAMPLE = 225ksps 40 80
REF2 Input Current IREF2
Acquisition between conversions ±0.01 ±1
μA
DAC
DC ACCURACY (Note 10)
Resolution 12 Bits
Integral Nonlinearity INL ±0.5 ±4 LSB
Differential Nonlinearity DNL Guaranteed monotonic ±1.0 LSB
Offset Error VOS (Note 8) ±3 ±10 mV
Offset-Error Drift ±10 ppm of
FS/°C
Gain Error GE (Note 8) ±5 ±10 LSB
Gain Temperature Coefficient ±8 ppm of
FS/°C
DAC OUTPUT
No load 0.02 VAVDD -
0.02
Output-Voltage Range
10k load to either rail 0.1 VAVDD -
0.1
V
DC Output Impedance 0.5
Capacitive Load (Note 11) 1 nF
VAVDD = 2.7V, VREF = 2.5V (MAX1257),
gain error < 1% 2000
Resistive Load to AGND RLVAVDD = 4.75V, VREF = 4.096V
(MAX1220/MAX1258), gain error < 2% 500
From power-down mode, VAVDD = 5V 25
Wake-Up Time (Note 12) From power-down mode, VAVDD = 2.7V 21 μs
1k Output Termination Programmed in from power-down mode 1 k
100k Output Termination At wake-up or programmed in
power-down mode 100 k
